Analysis
- max time kernel
130s - max time network
125s - platform
windows10_x64 - resource
win10-en-20210920 - submitted
10/10/2021, 11:48
Static task
static1
Behavioral task
behavioral1
Sample
ac60b43d159dcac0a93ac6dd12ce0bc6.exe
Resource
win7v20210408
Behavioral task
behavioral2
Sample
ac60b43d159dcac0a93ac6dd12ce0bc6.exe
Resource
win10-en-20210920
General
- Target ac60b43d159dcac0a93ac6dd12ce0bc6.exe
- Size 857KB
- Sample211010-nyfc4afghk
- SHA256 9afa91c839d958185548eccf40690eb7db7859a852ac06f3870a6165c287d6ba
- MD5 ac60b43d159dcac0a93ac6dd12ce0bc6
- SHA1 eb83e395c2f3c39eb297d3a192d4174a96e10455
- SHA512 9bf9877eae988b4d1ee761ff53eeabd74fb39a858f9993db77d20311e3932f49c7dc5b93c383f03df3c5ee26892ecb1c20780901b623343ce9f493d5f4f0da57
- MD5 SHA1 SHA512
Malware Config
Extracted
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vidar
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41.2
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517
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https://mas.to/@serg4325
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profile_id
517
Extracted
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djvu
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http://securebiz.org/fhsgtsspen6
Signatures
- Detected Djvu ransomware 6 IoCs
resource yara_rule behavioral2/memory/4036-117-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/4036-116-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/392-118-0x0000000003660000-0x000000000377B000-memory.dmp family_djvu behavioral2/memory/4036-119-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3924-125-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/3924-130-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu - Djvu Ransomware
Ransomware which is a variant of the STOP family.
- suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
suricata: ET MALWARE Potential Dridex.Maldoc Minimal Executable Request
- suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
- suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
suricata: ET MALWARE Vidar/Arkei Stealer Client Data Upload
- suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
- Vidar Stealer 4 IoCs
resource yara_rule behavioral2/memory/996-135-0x0000000000400000-0x00000000004D9000-memory.dmp family_vidar behavioral2/memory/996-136-0x00000000004A195D-mapping.dmp family_vidar behavioral2/memory/3404-138-0x0000000000D40000-0x0000000000E16000-memory.dmp family_vidar behavioral2/memory/996-139-0x0000000000400000-0x00000000004D9000-memory.dmp family_vidar - Downloads MZ/PE file
- Executes dropped EXE 8 IoCs
pid Process 3404 build2.exe 996 build2.exe 716 build3.exe 1776 build3.exe 3212 mstsca.exe 3108 mstsca.exe 1416 mstsca.exe 2264 mstsca.exe - Loads dropped DLL 2 IoCs
pid Process 996 build2.exe 996 build2.exe - Modifies file permissions 1 TTPs 1 IoCs
pid Process 3144 icacls.exe - Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2481030822-2828258191-1606198294-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\befef94f-7262-427d-baf8-9bd721064c2a\\ac60b43d159dcac0a93ac6dd12ce0bc6.exe\" --AutoStart" ac60b43d159dcac0a93ac6dd12ce0bc6.exe - Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 8 api.2ip.ua 9 api.2ip.ua 26 api.2ip.ua - Suspicious use of SetThreadContext 5 IoCs
description pid Process procid_target PID 392 set thread context of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 812 set thread context of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 3404 set thread context of 996 3404 build2.exe 77 PID 716 set thread context of 1776 716 build3.exe 79 PID 3212 set thread context of 3108 3212 mstsca.exe 88 - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 build2.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString build2.exe - Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 756 schtasks.exe 3772 schtasks.exe - Delays execution with timeout.exe 1 IoCs
pid Process 1768 timeout.exe - Kills process with taskkill 1 IoCs
pid Process 1620 taskkill.exe -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349 ac60b43d159dcac0a93ac6dd12ce0bc6.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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 ac60b43d159dcac0a93ac6dd12ce0bc6.exe - Suspicious behavior: EnumeratesProcesses 12 IoCs
pid Process 4036 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 4036 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 3924 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 3924 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 996 build2.exe 996 build2.exe 996 build2.exe 996 build2.exe 996 build2.exe 996 build2.exe 996 build2.exe 996 build2.exe - Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 1620 taskkill.exe - Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 392 wrote to memory of 4036 392 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 70 PID 4036 wrote to memory of 3144 4036 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 72 PID 4036 wrote to memory of 3144 4036 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 72 PID 4036 wrote to memory of 3144 4036 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 72 PID 4036 wrote to memory of 812 4036 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 73 PID 4036 wrote to memory of 812 4036 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 73 PID 4036 wrote to memory of 812 4036 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 73 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 812 wrote to memory of 3924 812 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 75 PID 3924 wrote to memory of 3404 3924 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 76 PID 3924 wrote to memory of 3404 3924 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 76 PID 3924 wrote to memory of 3404 3924 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 76 PID 3404 wrote to memory of 996 3404 build2.exe 77 PID 3404 wrote to memory of 996 3404 build2.exe 77 PID 3404 wrote to memory of 996 3404 build2.exe 77 PID 3404 wrote to memory of 996 3404 build2.exe 77 PID 3404 wrote to memory of 996 3404 build2.exe 77 PID 3404 wrote to memory of 996 3404 build2.exe 77 PID 3404 wrote to memory of 996 3404 build2.exe 77 PID 3404 wrote to memory of 996 3404 build2.exe 77 PID 3924 wrote to memory of 716 3924 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 78 PID 3924 wrote to memory of 716 3924 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 78 PID 3924 wrote to memory of 716 3924 ac60b43d159dcac0a93ac6dd12ce0bc6.exe 78 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 716 wrote to memory of 1776 716 build3.exe 79 PID 1776 wrote to memory of 756 1776 build3.exe 80 PID 1776 wrote to memory of 756 1776 build3.exe 80 PID 1776 wrote to memory of 756 1776 build3.exe 80 PID 996 wrote to memory of 1368 996 build2.exe 82 PID 996 wrote to memory of 1368 996 build2.exe 82 PID 996 wrote to memory of 1368 996 build2.exe 82 PID 1368 wrote to memory of 1620 1368 cmd.exe 84 PID 1368 wrote to memory of 1620 1368 cmd.exe 84 PID 1368 wrote to memory of 1620 1368 cmd.exe 84 PID 1368 wrote to memory of 1768 1368 cmd.exe 86 PID 1368 wrote to memory of 1768 1368 cmd.exe 86 PID 1368 wrote to memory of 1768 1368 cmd.exe 86 PID 3212 wrote to memory of 3108 3212 mstsca.exe 88 PID 3212 wrote to memory of 3108 3212 mstsca.exe 88 PID 3212 wrote to memory of 3108 3212 mstsca.exe 88
Processes
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C:\Users\Admin\AppData\Local\Temp\ac60b43d159dcac0a93ac6dd12ce0bc6.exe"C:\Users\Admin\AppData\Local\Temp\ac60b43d159dcac0a93ac6dd12ce0bc6.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:392 -
C:\Users\Admin\AppData\Local\Temp\ac60b43d159dcac0a93ac6dd12ce0bc6.exe"C:\Users\Admin\AppData\Local\Temp\ac60b43d159dcac0a93ac6dd12ce0bc6.exe"2⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4036 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\befef94f-7262-427d-baf8-9bd721064c2a" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:3144
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C:\Users\Admin\AppData\Local\Temp\ac60b43d159dcac0a93ac6dd12ce0bc6.exe"C:\Users\Admin\AppData\Local\Temp\ac60b43d159dcac0a93ac6dd12ce0bc6.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:812 -
C:\Users\Admin\AppData\Local\Temp\ac60b43d159dcac0a93ac6dd12ce0bc6.exe"C:\Users\Admin\AppData\Local\Temp\ac60b43d159dcac0a93ac6dd12ce0bc6.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3924 -
C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build2.exe"C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3404 -
C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build2.exe"C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:996 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build2.exe" & del C:\ProgramData\*.dll & exit7⤵
- Suspicious use of WriteProcessMemory
PID:1368 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im build2.exe /f8⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1620
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:1768
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C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build3.exe"C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:716 -
C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build3.exe"C:\Users\Admin\AppData\Local\f2a62558-7571-40e3-9c19-963cb149132d\build3.exe"6⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1776 -
C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"7⤵
- Creates scheduled task(s)
PID:756
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C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3212 -
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe2⤵
- Executes dropped EXE
PID:3108 -
C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"3⤵
- Creates scheduled task(s)
PID:3772
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C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
PID:1416 -
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe2⤵
- Executes dropped EXE
PID:2264
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