Analysis
- max time kernel
70s - max time network
137s - platform
windows10_x64 - resource
win10v20210408 - submitted
08/06/2021, 06:32
Static task
static1
Behavioral task
behavioral1
Sample
3f355ae395b605682e8c759c50c3bdb3.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
3f355ae395b605682e8c759c50c3bdb3.exe
Resource
win10v20210408
General
- Target 3f355ae395b605682e8c759c50c3bdb3.exe
- Size 809KB
- Sample210608-vs6hfnycne
- SHA256 d577b90e358071e4681e45d1b0d69d28d8671b1bc7200ddac5b6dab5b3482f66
- MD5 3f355ae395b605682e8c759c50c3bdb3
- SHA1 336babb2c5f6890f723f6e431a99ecad6f9907ef
- SHA512 b6ce0b8eaf68efa6539a99981617db1e43d576c6d244499b0e15d7ab8a8f3ec05566a367de8854763066059bf0fe29af81e9904e8b29bf4b0bbbbc0a899683f2
- MD5 SHA1 SHA512
Malware Config
Extracted
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vidar
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39.3
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517
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https://bandakere.tumblr.com
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profile_id
517
Signatures
- Deletes Windows Defender Definitions 2 TTPs 1 IoCs
Uses mpcmdrun utility to delete all AV definitions.
pid Process 648 mpcmdrun.exe - Djvu Ransomware
Ransomware which is a variant of the STOP family.
- Vidar Stealer 4 IoCs
resource yara_rule behavioral2/memory/3884-142-0x00000000004680AD-mapping.dmp family_vidar behavioral2/memory/3884-141-0x0000000000400000-0x000000000049B000-memory.dmp family_vidar behavioral2/memory/3244-145-0x0000000000630000-0x00000000006C8000-memory.dmp family_vidar behavioral2/memory/3884-146-0x0000000000400000-0x000000000049B000-memory.dmp family_vidar - Disables Task Manager via registry modification
- Downloads MZ/PE file
- Drops file in Drivers directory 1 IoCs
description ioc Process File opened for modification C:\Windows\System32\drivers\etc\hosts updatewin2.exe - Executes dropped EXE 5 IoCs
pid Process 1544 updatewin1.exe 3984 updatewin2.exe 3244 5.exe 3664 updatewin1.exe 3884 5.exe - Loads dropped DLL 2 IoCs
pid Process 3884 5.exe 3884 5.exe - Modifies file permissions 1 TTPs 1 IoCs
pid Process 3380 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\\6f8c7b35-ee87-4192-a36d-f8de69ac1d9d\\3f355ae395b605682e8c759c50c3bdb3.exe\" --AutoStart" 3f355ae395b605682e8c759c50c3bdb3.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 10 api.2ip.ua 11 api.2ip.ua 21 api.2ip.ua - Suspicious use of SetThreadContext 3 IoCs
description pid Process procid_target PID 648 set thread context of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 192 set thread context of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 3244 set thread context of 3884 3244 5.exe 86 - 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 value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString 5.exe Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 5.exe - Delays execution with timeout.exe 1 IoCs
pid Process 3128 timeout.exe - Kills process with taskkill 1 IoCs
pid Process 3988 taskkill.exe -
description ioc Process Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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 3f355ae395b605682e8c759c50c3bdb3.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349 3f355ae395b605682e8c759c50c3bdb3.exe - Suspicious behavior: EnumeratesProcesses 22 IoCs
pid Process 2604 3f355ae395b605682e8c759c50c3bdb3.exe 2604 3f355ae395b605682e8c759c50c3bdb3.exe 1284 3f355ae395b605682e8c759c50c3bdb3.exe 1284 3f355ae395b605682e8c759c50c3bdb3.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 2028 powershell.exe 2028 powershell.exe 2028 powershell.exe 2028 powershell.exe 2680 powershell.exe 2680 powershell.exe 2680 powershell.exe 1612 powershell.exe 1612 powershell.exe 1612 powershell.exe - Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 2028 powershell.exe Token: SeDebugPrivilege 3988 taskkill.exe Token: SeDebugPrivilege 2680 powershell.exe Token: SeDebugPrivilege 1612 powershell.exe - Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 648 wrote to memory of 2604 648 3f355ae395b605682e8c759c50c3bdb3.exe 76 PID 2604 wrote to memory of 3380 2604 3f355ae395b605682e8c759c50c3bdb3.exe 77 PID 2604 wrote to memory of 3380 2604 3f355ae395b605682e8c759c50c3bdb3.exe 77 PID 2604 wrote to memory of 3380 2604 3f355ae395b605682e8c759c50c3bdb3.exe 77 PID 2604 wrote to memory of 192 2604 3f355ae395b605682e8c759c50c3bdb3.exe 78 PID 2604 wrote to memory of 192 2604 3f355ae395b605682e8c759c50c3bdb3.exe 78 PID 2604 wrote to memory of 192 2604 3f355ae395b605682e8c759c50c3bdb3.exe 78 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 192 wrote to memory of 1284 192 3f355ae395b605682e8c759c50c3bdb3.exe 81 PID 1284 wrote to memory of 1544 1284 3f355ae395b605682e8c759c50c3bdb3.exe 82 PID 1284 wrote to memory of 1544 1284 3f355ae395b605682e8c759c50c3bdb3.exe 82 PID 1284 wrote to memory of 1544 1284 3f355ae395b605682e8c759c50c3bdb3.exe 82 PID 1284 wrote to memory of 3984 1284 3f355ae395b605682e8c759c50c3bdb3.exe 83 PID 1284 wrote to memory of 3984 1284 3f355ae395b605682e8c759c50c3bdb3.exe 83 PID 1284 wrote to memory of 3984 1284 3f355ae395b605682e8c759c50c3bdb3.exe 83 PID 1284 wrote to memory of 3244 1284 3f355ae395b605682e8c759c50c3bdb3.exe 84 PID 1284 wrote to memory of 3244 1284 3f355ae395b605682e8c759c50c3bdb3.exe 84 PID 1284 wrote to memory of 3244 1284 3f355ae395b605682e8c759c50c3bdb3.exe 84 PID 1544 wrote to memory of 3664 1544 updatewin1.exe 85 PID 1544 wrote to memory of 3664 1544 updatewin1.exe 85 PID 1544 wrote to memory of 3664 1544 updatewin1.exe 85 PID 3244 wrote to memory of 3884 3244 5.exe 86 PID 3244 wrote to memory of 3884 3244 5.exe 86 PID 3244 wrote to memory of 3884 3244 5.exe 86 PID 3244 wrote to memory of 3884 3244 5.exe 86 PID 3244 wrote to memory of 3884 3244 5.exe 86 PID 3244 wrote to memory of 3884 3244 5.exe 86 PID 3244 wrote to memory of 3884 3244 5.exe 86 PID 3244 wrote to memory of 3884 3244 5.exe 86 PID 3664 wrote to memory of 2028 3664 updatewin1.exe 87 PID 3664 wrote to memory of 2028 3664 updatewin1.exe 87 PID 3664 wrote to memory of 2028 3664 updatewin1.exe 87 PID 3884 wrote to memory of 1112 3884 5.exe 89 PID 3884 wrote to memory of 1112 3884 5.exe 89 PID 3884 wrote to memory of 1112 3884 5.exe 89 PID 1112 wrote to memory of 3988 1112 cmd.exe 91 PID 1112 wrote to memory of 3988 1112 cmd.exe 91 PID 1112 wrote to memory of 3988 1112 cmd.exe 91 PID 1112 wrote to memory of 3128 1112 cmd.exe 93 PID 1112 wrote to memory of 3128 1112 cmd.exe 93 PID 1112 wrote to memory of 3128 1112 cmd.exe 93 PID 3664 wrote to memory of 2680 3664 updatewin1.exe 94 PID 3664 wrote to memory of 2680 3664 updatewin1.exe 94 PID 3664 wrote to memory of 2680 3664 updatewin1.exe 94 PID 2680 wrote to memory of 1612 2680 powershell.exe 96 PID 2680 wrote to memory of 1612 2680 powershell.exe 96 PID 2680 wrote to memory of 1612 2680 powershell.exe 96
Processes
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C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe"C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:648 -
C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe"C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe"2⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2604 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\6f8c7b35-ee87-4192-a36d-f8de69ac1d9d" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:3380
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C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe"C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:192 -
C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe"C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1284 -
C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin1.exe"C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin1.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1544 -
C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin1.exe"C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin1.exe" --Admin6⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:3664 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exepowershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned7⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2028
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exepowershell -NoProfile -ExecutionPolicy Bypass -Command "& {Start-Process PowerShell -ArgumentList '-NoProfile -ExecutionPolicy Bypass -File ""C:\Users\Admin\AppData\Local\script.ps1""' -Verb RunAs}"7⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2680 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -File "C:\Users\Admin\AppData\Local\script.ps18⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1612
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C:\Program Files\Windows Defender\mpcmdrun.exe"C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all7⤵
- Deletes Windows Defender Definitions
PID:648
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""7⤵PID:4048
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C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin2.exe"C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin2.exe"5⤵
- Drops file in Drivers directory
- Executes dropped EXE
PID:3984
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C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe"C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3244 -
C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe"C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3884 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im 5.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe" & del C:\ProgramData\*.dll & exit7⤵
- Suspicious use of WriteProcessMemory
PID:1112 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im 5.exe /f8⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:3988
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:3128
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