US-CERT - AR18-149A: MAR-10135536-3 - HIDDEN COBRA RAT/Worm

Original release date: May 29, 2018

Description

Notification This report is provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. The DHS does not endorse any commercial product or service, referenced in this bulletin or otherwise. This document is marked TLP:WHITE. Disclosure is not limited. Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction. For more information on the Traffic Light Protocol, see https://ift.tt/1qJcHPA. Summary Description This submission includes four unique files. The first is an installer for additional malware: a Remote Access Trojan (RAT) and a malicious Dynamic Link Library (DLL) that functions as a Server Message Block (SMB) Worm. The fourth file is another SMB worm in the form of a Windows 32-bit executable. Both SMB worms attempt to spread locally and to random IP addresses on the public Internet by attempting to brute force vulnerable systems using a built-in list of common passwords. The RAT included with the SMB worm provides the attacker with the ability to deliver additional malware, run local commands, and exfiltrate data. For a downloadable copy of IOCs see: MAR-10135536-3.stix Emails (2) misswang8107@gmail.com redhat@gmail.com Submitted Files (4) 077d9e0e12357d27f7f0c336239e961a7049971446f7a3f10268d9439ef67885 (4731CBAEE7ACA37B596E38690160A7...) a1c483b0ee740291b91b11e18dd05f0a460127acfc19d47b446d11cd0e26d717 (scardprv.dll) ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 (Wmmvsvc.dll) fe7d35d19af5f5ae2939457a06868754b8bdd022e1ff5bdbe4e7c135c48f9a16 (298775B04A166FF4B8FBD3609E7169...) Findings 077d9e0e12357d27f7f0c336239e961a7049971446f7a3f10268d9439ef67885 Tags backdoortrojanworm Details Name 4731CBAEE7ACA37B596E38690160A749 Size 208896 bytes Type PE32 executable (GUI) Intel 80386, for MS Windows MD5 4731cbaee7aca37b596e38690160a749 SHA1 80fac6361184a3e24b33f6acb8688a6b7276b0f2 SHA256 077d9e0e12357d27f7f0c336239e961a7049971446f7a3f10268d9439ef67885 SHA512 9fdc1bf087d3e2fa80ff4ed749b11a2b3f863bed7a59850f6330fc1467c38eed052eee0337d2f82f9fe8e145f68199b966ae3c08f7ad1475b665beb8cd29f6d7 ssdeep 6144:M6atGpHk4NdSksOBbNUyb4ajb1TWiYW9ebYwtJEGLYMYR4:Msdk4NdSksOv Entropy 7.731026 Antivirus AVG BackDoor.Generic14.ARHX Ahnlab Trojan/Win32.Npkon Avira BDS/Joanap.A.11 BitDefender Gen:Variant.Barys.57573 ClamAV Win.Trojan.Agent-1388737 Cyren W32/Zegost.AA.gen!Eldorado ESET Win32/Scadprv.A trojan Emsisoft Gen:Variant.Barys.57573 (B) F-secure Gen:Variant.Barys.57573 Ikarus Worm.Win32.Agent K7 Backdoor ( 04c4b9d11 ) McAfee W32/FunCash!worm Microsoft Security Essentials Backdoor:Win32/Joanap.J!dha NANOAV Trojan.Win32.Agent.crilzb Quick Heal Backdoor.Joanap Sophos Mal/EncPk-AGS Symantec Trojan.Gen.2 Systweak trojan.agent TrendMicro BKDR_JOANAP.AC TrendMicro House Call BKDR_JOANAP.AC Vir.IT eXplorer Backdoor.Win32.Generic.ARHX VirusBlokAda Worm.Agent Zillya! Worm.Agent.Win32.3373 nProtect Worm/W32.Agent.208896.AK Yara Rules hidden_cobra_consolidated.yara rule Enfal_Generic { meta: author = "NCCIC trusted 3rd party" incident = "10135536" date = "2018-04-12" category = "hidden_cobra" family = "BRAMBUL,JOANAP" MD5_1 = "483B95B1498B615A1481345270BFF87D" MD5_2 = "4731CBAEE7ACA37B596E38690160A749" MD5_3 = "CD60FD107BAACCAFA6C24C1478C345C8" MD5_4 = "298775B04A166FF4B8FBD3609E716945" Info = "Detects Hidden Cobra SMB Worm / RAT" strings: $s0 = {6D737373636172647072762E6178} $s1 = {6E3472626872697138393076393D3032333D30312A2628542D30513332354A314E3B4C4B} $s2 = {72656468617440676D61696C2E636F6D} $s3 = {6D69737377616E673831303740676D61696C2E636F6D} $s4 = {534232755365435632564474} $s5 = {794159334D6559704275415756426341} $s6 = {705641325941774242347A41346167664B6232614F7A4259} $s7 = {AE8591916D586DE4F6FB8EE2F0BBF1F9} $s8 = {F96D5DD36D6D9A87DD6D506D6D6D516D} $s9 = {43616E6E6F74206372656174652072656D6F74652066696C652E} $s10 = {43616E6E6F74206F70656E2072656D6F74652066696C65} $s11 = {663D547D75128D85FCFEFFFF5056} $s12 = {663D547D75128D85FCFEFFFF5056E88C060000E9A9000000663D557D7512} $s13 = {663D567D750F8D85FCFEFFFF5056E891070000EB7C663D577D} $s14 = {3141327A3342347935433678374438773945307624465F754774487349724A71} $s15 = {393032356A6864686F333965686532} condition: ($s0) or ($s1) or ($s2) or ($s3) or ($s4 and $s5 and $s6) or ($s7 and $s8) or ($s9 and $s10 and $s11) or ($s12 and $s13) or ($s14 and $s15) } ssdeep Matches No matches found. PE Metadata Compile Date 2011-09-14 01:53:24-04:00 Import Hash e8cd12071a8e823ebc434c8ee3e23203 PE Sections MD5 Name Raw Size Entropy bf69e0e64bdafa28b31e3c2134e1d696 header 4096 0.658046 27f1df91dc992ababc89460f771a6026 .text 24576 6.227301 249e10a4ad0a58c3db84eb2f69db5db5 .rdata 4096 4.367702 88b5582d4d361c92e9234abf0942ed9e .data 4096 2.546586 a18b7869b3bfd4a2ef0d03c96fa09221 .rsrc 172032 7.969250 Packers/Compilers/Cryptors Installer VISE Custom Process List Process PID PPID 077d9e0e12357d27f7f0c336239e961a7049971446f7a3f10268d9439ef67885.exe 2628 (2588) Relationships 077d9e0e12... Dropped a1c483b0ee740291b91b11e18dd05f0a460127acfc19d47b446d11cd0e26d717 077d9e0e12... Dropped ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 Description This 32-bit Windows executable file drops two malicious applications. The first (a1c483b0ee740291b91b11e18dd05f0a460127acfc19d47b446d11cd0e26d717) is a fully functioning RAT. The second application (ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781) is a SMB worm that will spread to local subnets and external networks. a1c483b0ee740291b91b11e18dd05f0a460127acfc19d47b446d11cd0e26d717 Tags backdoorbottrojanworm Details Name scardprv.dll Size 77824 bytes Type PE32 executable (DLL) (GUI) Intel 80386, for MS Windows MD5 4613f51087f01715bf9132c704aea2c2 SHA1 6b1ddf0e63e04146d68cd33b0e18e668b29035c4 SHA256 a1c483b0ee740291b91b11e18dd05f0a460127acfc19d47b446d11cd0e26d717 SHA512 37fa5336d1554557250e4a3bcb4ccfca79f4873264cb161dee340d35a2f8f17f7853fe942809bb343ac1eae0a37122b5e8fd703a9b820ec96abb65c8327c1b6a ssdeep 768:qtT2AxNtcgpqLepcy2y6/chYdP8KuSFM+Cs5CBaho9S4AJKqBz8MZdVsrQVBnVGa:qwONtBqL1dDMrs5CN9S4A3HOYBnVL Entropy 6.138177 Antivirus AVG Agent3.BAPF Ahnlab Trojan/Win32.Dllbot Avira TR/Gendal.6762100 BitDefender Gen:Variant.Graftor.Elzob.3935 ClamAV Win.Trojan.Agent-1388765 ESET a variant of Win32/Scadprv.A trojan Emsisoft Gen:Variant.Graftor.Elzob.3935 (B) F-secure Gen:Variant.Graftor.Elzob.3935 Ikarus Worm.Win32.Agent K7 Trojan ( 0001659c1 ) McAfee W32/FunCash!worm Microsoft Security Essentials Backdoor:Win32/Joanap.B!dha NANOAV Trojan.Win32.Agent.cwccco Quick Heal Backdoor.Duzzer.A5 Sophos Mal/Generic-L Symantec Backdoor.Joanap Systweak malware.gen-20120501 TrendMicro BKDR_JOANAP.AC TrendMicro House Call BKDR_JOANAP.AC Vir.IT eXplorer Trojan.Win32.Agent3.BAPF VirusBlokAda Worm.Agent Zillya! Worm.Agent.Win32.5702 nProtect Worm/W32.Agent.77824.CJ Yara Rules hidden_cobra_consolidated.yara rule Enfal_Generic { meta: author = "NCCIC trusted 3rd party" incident = "10135536" date = "2018-04-12" category = "hidden_cobra" family = "BRAMBUL,JOANAP" MD5_1 = "483B95B1498B615A1481345270BFF87D" MD5_2 = "4731CBAEE7ACA37B596E38690160A749" MD5_3 = "CD60FD107BAACCAFA6C24C1478C345C8" MD5_4 = "298775B04A166FF4B8FBD3609E716945" Info = "Detects Hidden Cobra SMB Worm / RAT" strings: $s0 = {6D737373636172647072762E6178} $s1 = {6E3472626872697138393076393D3032333D30312A2628542D30513332354A314E3B4C4B} $s2 = {72656468617440676D61696C2E636F6D} $s3 = {6D69737377616E673831303740676D61696C2E636F6D} $s4 = {534232755365435632564474} $s5 = {794159334D6559704275415756426341} $s6 = {705641325941774242347A41346167664B6232614F7A4259} $s7 = {AE8591916D586DE4F6FB8EE2F0BBF1F9} $s8 = {F96D5DD36D6D9A87DD6D506D6D6D516D} $s9 = {43616E6E6F74206372656174652072656D6F74652066696C652E} $s10 = {43616E6E6F74206F70656E2072656D6F74652066696C65} $s11 = {663D547D75128D85FCFEFFFF5056} $s12 = {663D547D75128D85FCFEFFFF5056E88C060000E9A9000000663D557D7512} $s13 = {663D567D750F8D85FCFEFFFF5056E891070000EB7C663D577D} $s14 = {3141327A3342347935433678374438773945307624465F754774487349724A71} $s15 = {393032356A6864686F333965686532} condition: ($s0) or ($s1) or ($s2) or ($s3) or ($s4 and $s5 and $s6) or ($s7 and $s8) or ($s9 and $s10 and $s11) or ($s12 and $s13) or ($s14 and $s15) } ssdeep Matches No matches found. PE Metadata Compile Date 2011-09-14 01:38:38-04:00 Import Hash f6f7b2e00921129d18061822197111cd PE Sections MD5 Name Raw Size Entropy c745765d5ae0458d76c721b8a82eca52 header 4096 0.763991 f16ff24a6d95e0e0711eccae4283bbe5 .text 40960 6.506011 b89bb8a288d739a27d7021183336413c .rdata 20480 6.655349 fcd7ede94211c9d653bd8cc776feb8be .data 4096 4.326483 56dc69f697f36158eefefdde895f39b6 .rsrc 4096 0.613739 20601cf5d6aecb9837dcc1747847c5a2 .reloc 4096 4.068756 Packers/Compilers/Cryptors Microsoft Visual C++ 6.0 DLL Relationships a1c483b0ee... Dropped_By 077d9e0e12357d27f7f0c336239e961a7049971446f7a3f10268d9439ef67885 Description This 32-bit Windows DLL is written to disk and then loaded by the file "4731CBAEE7ACA37B596E38690160A749". This malware has been identified as a RAT, providing a remote actor with the ability to exfiltrate data, drop and run secondary payloads, and provide proxy capabilities on a compromised Windows device. The malware binds to port 443 and listens for incoming connections from a remote operator, using the Rivest Cipher 4 (RC4) encryption algorithm to protect communications with its Command and Control (C2). The malware also creates a log entry in a file named “mssscardprv.ax”, located in the %WINDIR%\system32 folder. The log entry includes the victim's Internet Protocol (IP) address, host name, and current system time. ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 Tags backdoorbottrojanworm Details Name Wmmvsvc.dll Size 91664 bytes Type PE32 executable (DLL) (GUI) Intel 80386, for MS Windows MD5 e86c2f4fc88918246bf697b6a404c3ea SHA1 9b7609349a4b9128b9db8f11ac1c77728258862c SHA256 ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 SHA512 f6097c66a526ba7a3c918b1c7fccae03c812046d642a4adb62ee7a24cbcee889c0348020ae7e2e82ee3f284b311f049ed596edb22b90153cadc11c646d4f9a45 ssdeep 768:9eY/pEwKWcwP/bY4XxlGLup3Tq1LpDLJkDcw3f9zj:MitnU4viJJDw3Z Entropy 3.156854 Antivirus AVG PSW.Generic9.ACQQ Ahnlab Trojan/Win32.Dllbot Avira BDS/Joanap.A.8 BitDefender Gen:Variant.Symmi.49274 ClamAV Win.Trojan.Agent-1388727 Cyren W32/Trojan.WXKV-0327 ESET a variant of Win32/Agent.NJF worm Emsisoft Gen:Variant.Symmi.49274 (B) F-secure Gen:Variant.Symmi.49274 Ikarus Worm.Win32.Agent K7 Trojan ( 00515bda1 ) McAfee Generic PWS.tr Microsoft Security Essentials Backdoor:Win32/Joanap.A!dha NANOAV Trojan.Win32.Agent.cqilax NetGate Trojan.Win32.Malware Quick Heal Backdoor.Joanap Sophos Mal/Generic-L Symantec W32.Brambul Vir.IT eXplorer Trojan.Win32.Generic.ACQQ VirusBlokAda Worm.Agent Zillya! Worm.Agent.Win32.3549 nProtect Worm/W32.Agent.91664 Yara Rules hidden_cobra_consolidated.yara rule Enfal_Generic { meta: author = "NCCIC trusted 3rd party" incident = "10135536" date = "2018-04-12" category = "hidden_cobra" family = "BRAMBUL,JOANAP" MD5_1 = "483B95B1498B615A1481345270BFF87D" MD5_2 = "4731CBAEE7ACA37B596E38690160A749" MD5_3 = "CD60FD107BAACCAFA6C24C1478C345C8" MD5_4 = "298775B04A166FF4B8FBD3609E716945" Info = "Detects Hidden Cobra SMB Worm / RAT" strings: $s0 = {6D737373636172647072762E6178} $s1 = {6E3472626872697138393076393D3032333D30312A2628542D30513332354A314E3B4C4B} $s2 = {72656468617440676D61696C2E636F6D} $s3 = {6D69737377616E673831303740676D61696C2E636F6D} $s4 = {534232755365435632564474} $s5 = {794159334D6559704275415756426341} $s6 = {705641325941774242347A41346167664B6232614F7A4259} $s7 = {AE8591916D586DE4F6FB8EE2F0BBF1F9} $s8 = {F96D5DD36D6D9A87DD6D506D6D6D516D} $s9 = {43616E6E6F74206372656174652072656D6F74652066696C652E} $s10 = {43616E6E6F74206F70656E2072656D6F74652066696C65} $s11 = {663D547D75128D85FCFEFFFF5056} $s12 = {663D547D75128D85FCFEFFFF5056E88C060000E9A9000000663D557D7512} $s13 = {663D567D750F8D85FCFEFFFF5056E891070000EB7C663D577D} $s14 = {3141327A3342347935433678374438773945307624465F754774487349724A71} $s15 = {393032356A6864686F333965686532} condition: ($s0) or ($s1) or ($s2) or ($s3) or ($s4 and $s5 and $s6) or ($s7 and $s8) or ($s9 and $s10 and $s11) or ($s12 and $s13) or ($s14 and $s15) } ssdeep Matches No matches found. PE Metadata Compile Date 2011-09-14 11:42:30-04:00 Import Hash f0087d7b90876a2769f2229c6789fcf3 Company Name Microsoft Corporation File Description Microsoft XML Encoder/Transcoder Internal Name xpsshrm.dll Legal Copyright © Microsoft Corporation. All rights reserved. Original Filename xpsshrm.dll Product Name Microsoft® Windows Media Services Product Version 9.00.00.4503 PE Sections MD5 Name Raw Size Entropy 037e97300efd533dd48d334d30bdc408 header 4096 0.759334 4b5019185bb0b82273442dae3f15f105 .text 24576 6.083997 9e5a1cfda72f8944cd5e35e33a2a73b0 .rdata 4096 3.267725 47982ac1b20cac03adcfd62f5881b79c .data 49152 1.087883 b971ab49349a660c70cb6987b7fb3ed3 .rsrc 4096 1.140488 ad5750c9584c0eba32643810ab6e8a53 .reloc 4096 2.515288 Packers/Compilers/Cryptors Microsoft Visual C++ 6.0 DLL Relationships ea46ed5aed... Dropped_By 077d9e0e12357d27f7f0c336239e961a7049971446f7a3f10268d9439ef67885 ea46ed5aed... Connected_To redhat@gmail.com ea46ed5aed... Connected_To misswang8107@gmail.com Description This file is a malicious 32-bit Windows DLL that is written to disk then loaded by the file "4731CBAEE7ACA37B596E38690160A749". When executed, the DLL attempts to contact all of the Internet Protocol (IP) addresses on the victim's local subnet. If the malware is able to connect to these IP addresses, it will attempt to gain unauthorized access via the SMB protocol on port 445 using a brute-force password attack. The malware contains an embedded password list consisting of commonly used passwords and generates random external IP addresses, which it attempts to attack. If the malware successfully gains access to another system, it will send an email containing the system's IP address, hostname, username, and password to the following addresses: --Begin email addresses-- redhat@gmail.com misswang8107@gmail.com --End email addresses-- The malware uses the victim's system folder to create a shared folder named "adnim$" by running the following commands via a remotely run service: --Begin commands utilized to create SMB share-- cmd.exe /q /c net share adnim$=%SystemRoot% cmd.exe /q /c net share adnim$=%%SystemRoot%% /GRANT:%s,FULL --End commands utilized to create SMB share-- The malware will then copy itself to newly created shared folder as a file named "mssscardprv.ax". After copying the malware to the new system it then runs the file on the victim system using a malicious service. The adnim$ share will then be deleted from the remote system using the following command: --Begin command used to delete share-- 'cmd.exe /q /c net share adnim$ /delete' --End command used to delete share-- The malware determines if Remote Desktop Protocol (RDP) is enabled by attempting to connect to port 3389. If it is able to connect to this port, the malware will report RDP is available on the compromised system. This information is provided to the operator using the malicious email address provided earlier. This malware can communicate with the RAT identified as "scardprv.dll" (4613f51087f01715bf9132c704aea2c2). The communication is protected with the Rivest Cipher 4 (RC4) encryption protocol. When attempting to propagate, the malware uses the following three usernames combined with a password brute-force attack: --Begin malicious usernames used by SMB worm-- Administrateur Administrador Administrator --End malicious usernames used by SMB worm-- Although the malware uses numerous embedded passwords in its brute force attacks, within our environment the malware consistently used the following "Lan Manager Response" in its SMB attacks: --Begin static Lan Manager response-- 8C15084FA541079A000000000000000000 --End static Lan Manager response-- This hexadecimal value may be useful in detecting this worm as it communicates over port 445 and attempts to spread. Specifically, when the malware attempts to run a remote service to create the "adnim$" share, the following network traffic is generated: --Begin network signature-- ASCII: cmd.exe /q /c net share adnim$=%SystemRoot% /GRANT:Administrator,FULL HEX: 636D642E657865202F71202F63206E65742073686172652061646E696D243D2553797374656D526F6F7425202F4752414E543A41646D696E6973747261746F722C46554C4C --End network signature-- fe7d35d19af5f5ae2939457a06868754b8bdd022e1ff5bdbe4e7c135c48f9a16 Tags backdoortrojanworm Details Name 298775B04A166FF4B8FBD3609E716945 Size 86016 bytes Type PE32 executable (GUI) Intel 80386, for MS Windows MD5 298775b04a166ff4b8fbd3609e716945 SHA1 2e0f666831f64d7383a11b444e2c16b38231f481 SHA256 fe7d35d19af5f5ae2939457a06868754b8bdd022e1ff5bdbe4e7c135c48f9a16 SHA512 adc9bb5a2116134ddf57d1b1765d5981c55828aa8c6719964b0e2eeb6c9068a2acaa98c2e03227a406a4fbfa2f007f5eb9f57a61e3749b8eb0d73b1881328fbf ssdeep 768:i+cDn8nAQ5Toz4c0+u5jrdXs+W+aCNkiC8xeC3cs:i+M8ndTozOn5jxF/US0s Entropy 2.873816 Antivirus ClamAV Win.Trojan.Agent-1388727 ESET a variant of Win32/Agent.NVC worm McAfee GenericRXCB-TI!298775B04A16 Microsoft Security Essentials Backdoor:Win32/Joanap.A!dha Symantec Heur.AdvML.B Yara Rules hidden_cobra_consolidated.yara rule Enfal_Generic { meta: author = "NCCIC trusted 3rd party" incident = "10135536" date = "2018-04-12" category = "hidden_cobra" family = "BRAMBUL,JOANAP" MD5_1 = "483B95B1498B615A1481345270BFF87D" MD5_2 = "4731CBAEE7ACA37B596E38690160A749" MD5_3 = "CD60FD107BAACCAFA6C24C1478C345C8" MD5_4 = "298775B04A166FF4B8FBD3609E716945" Info = "Detects Hidden Cobra SMB Worm / RAT" strings: $s0 = {6D737373636172647072762E6178} $s1 = {6E3472626872697138393076393D3032333D30312A2628542D30513332354A314E3B4C4B} $s2 = {72656468617440676D61696C2E636F6D} $s3 = {6D69737377616E673831303740676D61696C2E636F6D} $s4 = {534232755365435632564474} $s5 = {794159334D6559704275415756426341} $s6 = {705641325941774242347A41346167664B6232614F7A4259} $s7 = {AE8591916D586DE4F6FB8EE2F0BBF1F9} $s8 = {F96D5DD36D6D9A87DD6D506D6D6D516D} $s9 = {43616E6E6F74206372656174652072656D6F74652066696C652E} $s10 = {43616E6E6F74206F70656E2072656D6F74652066696C65} $s11 = {663D547D75128D85FCFEFFFF5056} $s12 = {663D547D75128D85FCFEFFFF5056E88C060000E9A9000000663D557D7512} $s13 = {663D567D750F8D85FCFEFFFF5056E891070000EB7C663D577D} $s14 = {3141327A3342347935433678374438773945307624465F754774487349724A71} $s15 = {393032356A6864686F333965686532} condition: ($s0) or ($s1) or ($s2) or ($s3) or ($s4 and $s5 and $s6) or ($s7 and $s8) or ($s9 and $s10 and $s11) or ($s12 and $s13) or ($s14 and $s15) } ssdeep Matches No matches found. PE Metadata Compile Date 2018-01-05 01:22:45-05:00 Import Hash 9f298eba36baa47b98a60cf36fdb2301 PE Sections MD5 Name Raw Size Entropy 8a5b06109c3bd4323fa3318f9874d529 header 4096 0.703885 413f30d4d86037b75958b45b9efbe1de .text 20480 6.302858 82b41fefc9aa74a2430f1421fd5fe5b3 .rdata 4096 3.748024 b6f17870ca5f45d4c75e18024e6e1180 .data 53248 1.067897 cda5ef1038742e5ef46b9cfa269b0434 .rsrc 4096 0.608792 Packers/Compilers/Cryptors Microsoft Visual C++ v6.0 Process List Process PID PPID fe7d35d19af5f5ae2939457a06868754b8bdd022e1ff5bdbe4e7c135c48f9a16.exe 2436 (2408) Description This file is a malicious 32-bit Windows executable file designed to scan the local network and the Internet for machines that are accessible and have open SMB ports. Once the malware gains access to a remote machine, it will deliver a malicious payload. This file accepts the following command-line arguments for execution: --Begin arguments-- -i ==> Create service -u ==> Control and delete service -s ==> Start service -r ==> Run not as a service -k ==> ControlService --End arguments-- When executed with the "-i" argument, the malware installs and executes itself as the following service: --Begin service information-- ServiceName = "RdpCertification" DisplayName = "Remote Desktop Certification Services" DesiredAccess = SERVICE_ALL_ACCESS ServiceType = SERVICE_WIN32_OWN_PROCESS|SERVICE_INTERACTIVE_PROCESS StartType = SERVICE_AUTO_START BinaryPathName = "%current directory%\298775B04A166FF4B8FBD3609E716945.exe" --End service information-- The malware creates a mutual exclusion (Mutex) object named "PlatFormSDK20150201", then generates a list of IP addresses using a domain generation algorithm (DGA). The DGA uses the system time in the algorithm to create the list of IP addresses. It generates network traffic over Transmission Control Protocol (TCP) ports 80 and 445 via the victims' IP addresses and the generated IP addresses. Sample HTTP request: --Begin HTTP request-- OPTIONS / HTTP/1.1 translate: f User-Agent: Microsoft-WebDAV-MiniRedir/5.1.2600 Host: 159.154.100.0 Content-Length: 0 Connection: Keep-Alive --End HTTP request-- Once successfully connected to other Windows hosts or the generated IP addresses using port 445, the malware attempts to use a hard-coded list of passwords for SMB connections. If the password is correctly guessed, a file share is established. The malware uses the following methods to access shares on the remote systems: To gain access to remote systems it uses ($IPC) share via “\\remote system IP\$IPC” It checks for existing shares by using “\\hostname\adnim$\system32” It will create a new share named "adnim$" using the following command: --Begin new share command-- “cmd.exe /q /c net share adnim$=%SystemRoot%” “cmd.exe /q /c net share adnim$=%%SystemRoot%% /GRANT:%s,FULL” --End new share command— Once a file share is successfully established, the malware uploads a copy of a payload "C:\WINDOWS\TEMP\TMP1.tmp" and installs it as a service. The malware payload that is uploaded and then run on the newly infected host was not available at the time of analysis. The remote network share is removed after infection using the following command: --Begin command-- “cmd.exe /q /c net share adnim$ /delete” --End command-- Once the payload has been uploaded and executed, the malware uses Simple Mail Transfer Protocol (SMTP) to send collected data. The data provides infection status to a remote operator. Displayed below are the domain names of the service providers used to send data: --Begin SMTP domain information-- "www.hotmail.com" --End SMTP domain information-- Displayed is the structure of the email sent: --Begin email structure format-- SUBJECT: %s%s%s TO: Joana <%s>%s FROM: <%s>%s DATA%s RCPT TO: <%s>%s MAIL FROM: <%s>%s AUTH LOGIN%s HELO %s%s --End email structure format-- Displayed is a list of brute force passwords used to establish connections: --Begin brute force password-- !@#$ !@#$% !@#$%^ !@#$%^& !@#$%^&* !@#$%^&*() "KGS!@#$%" 0000 00000 000000 00000000 1111 11111 111111 11111111 11122212 1212 121212 123123 123321 1234 12345 123456 1234567 12345678 123456789 123456^%$#@! 1234qwer 123abc 123asd 123qwe 1313 1q2w3e 1q2w3e4r 1qaz2wsx 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 4321 54321 654321 6969 666666 7777 8888 88888 888888 8888888 88888888 Admin abc123 abc@123 abcd admin admin123 admin!23 admin!@# administrator administrador asdf asdfg asdfgh asdf123 asdf!23 baseball backup blank cisco compaq control computer cookie123 database dbpassword db1234 default dell enable fish foobar gateway guest golf harley home iloveyou internet letmein Login login love manager oracle owner pass passwd password p@ssword password1 password! passw0rd Password1 pa55w0rd pw123 q1w2e3 q1w2e3r4 q1w2e3r4t5 q1w2e3r4t5y6 qazwsx qazwsxedc qwer qwert qwerty !QAZxsw2 root secret server sqlexec shadow super sybase temp temp123 test test! test1 test123 test!23 winxp win2000 win2003 Welcome1 Welcome123 xxxx yxcv zxcv Administrator Admin --End brute force password-- redhat@gmail.com Details Address redhat@gmail.com Relationships redhat@gmail.com Connected_From ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 misswang8107@gmail.com Details Address misswang8107@gmail.com Relationships misswang8107@gmail.com Connected_From ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 Relationship Summary 077d9e0e12... Dropped a1c483b0ee740291b91b11e18dd05f0a460127acfc19d47b446d11cd0e26d717 077d9e0e12... Dropped ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 a1c483b0ee... Dropped_By 077d9e0e12357d27f7f0c336239e961a7049971446f7a3f10268d9439ef67885 ea46ed5aed... Dropped_By 077d9e0e12357d27f7f0c336239e961a7049971446f7a3f10268d9439ef67885 ea46ed5aed... Connected_To redhat@gmail.com ea46ed5aed... Connected_To misswang8107@gmail.com redhat@gmail.com Connected_From ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 misswang8107@gmail.com Connected_From ea46ed5aed900cd9f01156a1cd446cbb3e10191f9f980e9f710ea1c20440c781 Recommendations NCCIC would like to remind users and administrators to consider using the following best practices to strengthen the security posture of their organization's systems. Any configuration changes should be reviewed by system owners and administrators prior to implementation to avoid unwanted impacts. Maintain up-to-date antivirus signatures and engines. Keep operating system patches up-to-date. Disable File and Printer sharing services. If these services are required, use strong passwords or Active Directory authentication. Restrict users' ability (permissions) to install and run unwanted software applications. Do not add users to the local administrators group unless required. Enforce a strong password policy and implement regular password changes. Exercise caution when opening e-mail attachments even if the attachment is expected and the sender appears to be known. Enable a personal firewall on agency workstations, configured to deny unsolicited connection requests. Disable unnecessary services on agency workstations and servers. Scan for and remove suspicious e-mail attachments; ensure the scanned attachment is its "true file type" (i.e., the extension matches the file header). Monitor users' web browsing habits; restrict access to sites with unfavorable content. Exercise caution when using removable media (e.g., USB thumbdrives, external drives, CDs, etc.). Scan all software downloaded from the Internet prior to executing. Maintain situational awareness of the latest threats and implement appropriate ACLs. Additional information on malware incident prevention and handling can be found in NIST's Special Publication 800-83, Guide to Malware Incident Prevention & Handling for Desktops and Laptops. Contact Information 1-888-282-0870 NCCICCustomerService@us-cert.gov (UNCLASS) us-cert@dhs.sgov.gov (SIPRNET) us-cert@dhs.ic.gov (JWICS) NCCIC continuously strives to improve its products and services. You can help by answering a very short series of questions about this product at the following URL: https://us-cert.gov/forms/feedback/ Document FAQ What is a MAR? A Malware Analysis Report (MAR) is intended to provide organizations with more detailed malware analysis acquired via manual reverse engineering. To request additional analysis, please contact US-CERT and provide information regarding the level of desired analysis. Can I edit this document? This document is not to be edited in any way by recipients. All comments or questions related to this document should be directed to the NCCIC at 1-888-282-0870 or soc@us-cert.gov. Can I submit malware to NCCIC? Malware samples can be submitted via three methods: Web: https://malware.us-cert.gov E-Mail: submit@malware.us-cert.gov FTP: ftp.malware.us-cert.gov (anonymous) NCCIC encourages you to report any suspicious activity, including cybersecurity incidents, possible malicious code, software vulnerabilities, and phishing-related scams. Reporting forms can be found on the NCCIC/US-CERT homepage at www.us-cert.gov.

Revisions

• May 29, 2018: Initial version

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from US-CERT: The United States Computer Emergency Readiness Team https://www.us-cert.gov/ncas/analysis-reports/AR18-149A