Analysis
- max time kernel
144s - max time network
137s - platform
windows10_x64 - resource
win10v20210408 - submitted
25/09/2021, 06:50
Static task
static1
Behavioral task
behavioral1
Sample
8040071b467298ae58dc7adc5b58a2e2.exe
Resource
win7-en-20210920
Behavioral task
behavioral2
Sample
8040071b467298ae58dc7adc5b58a2e2.exe
Resource
win10v20210408
General
- Target 8040071b467298ae58dc7adc5b58a2e2.exe
- Size 805KB
- Sample210925-hl4x2aaefq
- SHA256 7d992557f91aed01868636656b536282273feea15fc95f3bf4a42f4b7443fa77
- MD5 8040071b467298ae58dc7adc5b58a2e2
- SHA1 2da6c984afd17193ba7aae3d554e44aebda4cc14
- SHA512 eb0f4b6e985f4e7443c4adb108829db3c13f08f3749a8c4b74abe88adf95689b1ddd0b512eb7b0c50f79b1cb7977e73dcaae8223134c66f2a6e4d54201b1c4bb
- MD5 SHA1 SHA512
Malware Config
Signatures
- Detected Djvu ransomware 6 IoCs
resource yara_rule behavioral2/memory/508-114-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/508-115-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/3128-116-0x0000000002FD0000-0x00000000030EB000-memory.dmp family_djvu behavioral2/memory/508-117-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/1788-122-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/1788-127-0x0000000000400000-0x0000000000537000-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/2520-131-0x0000000000400000-0x00000000004D7000-memory.dmp family_vidar behavioral2/memory/2520-132-0x00000000004A032D-mapping.dmp family_vidar behavioral2/memory/2520-135-0x0000000000400000-0x00000000004D7000-memory.dmp family_vidar behavioral2/memory/2320-134-0x0000000003180000-0x0000000003254000-memory.dmp family_vidar - Downloads MZ/PE file
- Executes dropped EXE 8 IoCs
pid Process 2320 build2.exe 2520 build2.exe 2796 build3.exe 2628 build3.exe 3272 mstsca.exe 3680 mstsca.exe 3556 mstsca.exe 3940 mstsca.exe - Loads dropped DLL 2 IoCs
pid Process 2520 build2.exe 2520 build2.exe - Modifies file permissions 1 TTPs 1 IoCs
pid Process 3920 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-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\9eb5da55-a689-4d07-b5e9-4471bb764eba\\8040071b467298ae58dc7adc5b58a2e2.exe\" --AutoStart" 8040071b467298ae58dc7adc5b58a2e2.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 4 api.2ip.ua 5 api.2ip.ua 12 api.2ip.ua - Suspicious use of SetThreadContext 6 IoCs
description pid Process procid_target PID 3128 set thread context of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3560 set thread context of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 2320 set thread context of 2520 2320 build2.exe 76 PID 2796 set thread context of 2628 2796 build3.exe 79 PID 3272 set thread context of 3680 3272 mstsca.exe 91 PID 3556 set thread context of 3940 3556 mstsca.exe 95 - 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 3676 schtasks.exe 500 schtasks.exe - Delays execution with timeout.exe 1 IoCs
pid Process 2848 timeout.exe - Kills process with taskkill 1 IoCs
pid Process 1000 taskkill.exe -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349 8040071b467298ae58dc7adc5b58a2e2.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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 8040071b467298ae58dc7adc5b58a2e2.exe - Suspicious behavior: EnumeratesProcesses 12 IoCs
pid Process 508 8040071b467298ae58dc7adc5b58a2e2.exe 508 8040071b467298ae58dc7adc5b58a2e2.exe 1788 8040071b467298ae58dc7adc5b58a2e2.exe 1788 8040071b467298ae58dc7adc5b58a2e2.exe 2520 build2.exe 2520 build2.exe 2520 build2.exe 2520 build2.exe 2520 build2.exe 2520 build2.exe 2520 build2.exe 2520 build2.exe - Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 1000 taskkill.exe - Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 3128 wrote to memory of 508 3128 8040071b467298ae58dc7adc5b58a2e2.exe 68 PID 508 wrote to memory of 3920 508 8040071b467298ae58dc7adc5b58a2e2.exe 69 PID 508 wrote to memory of 3920 508 8040071b467298ae58dc7adc5b58a2e2.exe 69 PID 508 wrote to memory of 3920 508 8040071b467298ae58dc7adc5b58a2e2.exe 69 PID 508 wrote to memory of 3560 508 8040071b467298ae58dc7adc5b58a2e2.exe 70 PID 508 wrote to memory of 3560 508 8040071b467298ae58dc7adc5b58a2e2.exe 70 PID 508 wrote to memory of 3560 508 8040071b467298ae58dc7adc5b58a2e2.exe 70 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 3560 wrote to memory of 1788 3560 8040071b467298ae58dc7adc5b58a2e2.exe 72 PID 1788 wrote to memory of 2320 1788 8040071b467298ae58dc7adc5b58a2e2.exe 75 PID 1788 wrote to memory of 2320 1788 8040071b467298ae58dc7adc5b58a2e2.exe 75 PID 1788 wrote to memory of 2320 1788 8040071b467298ae58dc7adc5b58a2e2.exe 75 PID 2320 wrote to memory of 2520 2320 build2.exe 76 PID 2320 wrote to memory of 2520 2320 build2.exe 76 PID 2320 wrote to memory of 2520 2320 build2.exe 76 PID 2320 wrote to memory of 2520 2320 build2.exe 76 PID 2320 wrote to memory of 2520 2320 build2.exe 76 PID 2320 wrote to memory of 2520 2320 build2.exe 76 PID 2320 wrote to memory of 2520 2320 build2.exe 76 PID 2320 wrote to memory of 2520 2320 build2.exe 76 PID 1788 wrote to memory of 2796 1788 8040071b467298ae58dc7adc5b58a2e2.exe 77 PID 1788 wrote to memory of 2796 1788 8040071b467298ae58dc7adc5b58a2e2.exe 77 PID 1788 wrote to memory of 2796 1788 8040071b467298ae58dc7adc5b58a2e2.exe 77 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2796 wrote to memory of 2628 2796 build3.exe 79 PID 2628 wrote to memory of 3676 2628 build3.exe 80 PID 2628 wrote to memory of 3676 2628 build3.exe 80 PID 2628 wrote to memory of 3676 2628 build3.exe 80 PID 2520 wrote to memory of 2008 2520 build2.exe 85 PID 2520 wrote to memory of 2008 2520 build2.exe 85 PID 2520 wrote to memory of 2008 2520 build2.exe 85 PID 2008 wrote to memory of 1000 2008 cmd.exe 87 PID 2008 wrote to memory of 1000 2008 cmd.exe 87 PID 2008 wrote to memory of 1000 2008 cmd.exe 87 PID 2008 wrote to memory of 2848 2008 cmd.exe 88 PID 2008 wrote to memory of 2848 2008 cmd.exe 88 PID 2008 wrote to memory of 2848 2008 cmd.exe 88 PID 3272 wrote to memory of 3680 3272 mstsca.exe 91 PID 3272 wrote to memory of 3680 3272 mstsca.exe 91 PID 3272 wrote to memory of 3680 3272 mstsca.exe 91
Processes
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C:\Users\Admin\AppData\Local\Temp\8040071b467298ae58dc7adc5b58a2e2.exe"C:\Users\Admin\AppData\Local\Temp\8040071b467298ae58dc7adc5b58a2e2.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3128 -
C:\Users\Admin\AppData\Local\Temp\8040071b467298ae58dc7adc5b58a2e2.exe"C:\Users\Admin\AppData\Local\Temp\8040071b467298ae58dc7adc5b58a2e2.exe"2⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:508 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\9eb5da55-a689-4d07-b5e9-4471bb764eba" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:3920
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C:\Users\Admin\AppData\Local\Temp\8040071b467298ae58dc7adc5b58a2e2.exe"C:\Users\Admin\AppData\Local\Temp\8040071b467298ae58dc7adc5b58a2e2.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3560 -
C:\Users\Admin\AppData\Local\Temp\8040071b467298ae58dc7adc5b58a2e2.exe"C:\Users\Admin\AppData\Local\Temp\8040071b467298ae58dc7adc5b58a2e2.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1788 -
C:\Users\Admin\AppData\Local\7653ab5b-08b0-494d-ad06-423b741de092\build2.exe"C:\Users\Admin\AppData\Local\7653ab5b-08b0-494d-ad06-423b741de092\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2320 -
C:\Users\Admin\AppData\Local\7653ab5b-08b0-494d-ad06-423b741de092\build2.exe"C:\Users\Admin\AppData\Local\7653ab5b-08b0-494d-ad06-423b741de092\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2520 -
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\7653ab5b-08b0-494d-ad06-423b741de092\build2.exe" & del C:\ProgramData\*.dll & exit7⤵
- Suspicious use of WriteProcessMemory
PID:2008 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im build2.exe /f8⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1000
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:2848
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C:\Users\Admin\AppData\Local\7653ab5b-08b0-494d-ad06-423b741de092\build3.exe"C:\Users\Admin\AppData\Local\7653ab5b-08b0-494d-ad06-423b741de092\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2796 -
C:\Users\Admin\AppData\Local\7653ab5b-08b0-494d-ad06-423b741de092\build3.exe"C:\Users\Admin\AppData\Local\7653ab5b-08b0-494d-ad06-423b741de092\build3.exe"6⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2628 -
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:3676
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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:3272 -
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe2⤵
- Executes dropped EXE
PID:3680 -
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:500
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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
PID:3556 -
C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe2⤵
- Executes dropped EXE
PID:3940
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