Analysis
- max time kernel
150s - max time network
111s - platform
windows10_x64 - resource
win10v20201028 - submitted
08/01/2021, 06:55
Static task
static1
Behavioral task
behavioral1
Sample
f.bin.exe
Resource
win7v20201028
windows7_x64
0 signatures
0 seconds
General
- Target f.bin.exe
- Size 658KB
- Sample210108-rl53n3fa7e
- SHA256 1c876d45db060f5be86ab9a13496c0b280d3c6031f00bb4ffebae99566a9249b
- MD5 3b6f11e1bfcb6137f555399ce5e5fec6
- SHA1 dbfe47ed7e9842b0a9014c11b7146c38963882c5
- SHA512 6d6b338a395cc42d527cee0dd06f051b86e7d135b764c6d7619eae0a9dba0e687e0578ff64d83ac7284fea1e727a6695a7e3d065e86d45b01cb81befeab89715
- MD5 SHA1 SHA512
Malware Config
Extracted
Family
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darkcomet
Botnet
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Guest16
C2
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ImagineTyingToGetMyIp-31268.portmap.host:31268
Mutex
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DC_MUTEX-B1A8DEL
Attributes
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InstallPath
MSDCSC\msdcsc.exe
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gencode
ZyDv1EUeB9PM
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install
true
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offline_keylogger
true
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persistence
true
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reg_key
MicroUpdate
Signatures
- Modifies WinLogon for persistence 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe" f.bin.exe - Executes dropped EXE 1 IoCs
pid Process 2820 msdcsc.exe - Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Control Panel\International\Geo\Nation f.bin.exe -
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" msdcsc.exe - Adds Run key to start application 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe" f.bin.exe Set value (str) \REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe" msdcsc.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance f.bin.exe - Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeIncreaseQuotaPrivilege 4052 f.bin.exe Token: SeSecurityPrivilege 4052 f.bin.exe Token: SeTakeOwnershipPrivilege 4052 f.bin.exe Token: SeLoadDriverPrivilege 4052 f.bin.exe Token: SeSystemProfilePrivilege 4052 f.bin.exe Token: SeSystemtimePrivilege 4052 f.bin.exe Token: SeProfSingleProcessPrivilege 4052 f.bin.exe Token: SeIncBasePriorityPrivilege 4052 f.bin.exe Token: SeCreatePagefilePrivilege 4052 f.bin.exe Token: SeBackupPrivilege 4052 f.bin.exe Token: SeRestorePrivilege 4052 f.bin.exe Token: SeShutdownPrivilege 4052 f.bin.exe Token: SeDebugPrivilege 4052 f.bin.exe Token: SeSystemEnvironmentPrivilege 4052 f.bin.exe Token: SeChangeNotifyPrivilege 4052 f.bin.exe Token: SeRemoteShutdownPrivilege 4052 f.bin.exe Token: SeUndockPrivilege 4052 f.bin.exe Token: SeManageVolumePrivilege 4052 f.bin.exe Token: SeImpersonatePrivilege 4052 f.bin.exe Token: SeCreateGlobalPrivilege 4052 f.bin.exe Token: 33 4052 f.bin.exe Token: 34 4052 f.bin.exe Token: 35 4052 f.bin.exe Token: 36 4052 f.bin.exe Token: SeIncreaseQuotaPrivilege 2820 msdcsc.exe Token: SeSecurityPrivilege 2820 msdcsc.exe Token: SeTakeOwnershipPrivilege 2820 msdcsc.exe Token: SeLoadDriverPrivilege 2820 msdcsc.exe Token: SeSystemProfilePrivilege 2820 msdcsc.exe Token: SeSystemtimePrivilege 2820 msdcsc.exe Token: SeProfSingleProcessPrivilege 2820 msdcsc.exe Token: SeIncBasePriorityPrivilege 2820 msdcsc.exe Token: SeCreatePagefilePrivilege 2820 msdcsc.exe Token: SeBackupPrivilege 2820 msdcsc.exe Token: SeRestorePrivilege 2820 msdcsc.exe Token: SeShutdownPrivilege 2820 msdcsc.exe Token: SeDebugPrivilege 2820 msdcsc.exe Token: SeSystemEnvironmentPrivilege 2820 msdcsc.exe Token: SeChangeNotifyPrivilege 2820 msdcsc.exe Token: SeRemoteShutdownPrivilege 2820 msdcsc.exe Token: SeUndockPrivilege 2820 msdcsc.exe Token: SeManageVolumePrivilege 2820 msdcsc.exe Token: SeImpersonatePrivilege 2820 msdcsc.exe Token: SeCreateGlobalPrivilege 2820 msdcsc.exe Token: 33 2820 msdcsc.exe Token: 34 2820 msdcsc.exe Token: 35 2820 msdcsc.exe Token: 36 2820 msdcsc.exe - Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2820 msdcsc.exe - Suspicious use of WriteProcessMemory 37 IoCs
description pid Process procid_target PID 4052 wrote to memory of 2196 4052 f.bin.exe 75 PID 4052 wrote to memory of 2196 4052 f.bin.exe 75 PID 4052 wrote to memory of 2196 4052 f.bin.exe 75 PID 4052 wrote to memory of 2356 4052 f.bin.exe 76 PID 4052 wrote to memory of 2356 4052 f.bin.exe 76 PID 4052 wrote to memory of 2356 4052 f.bin.exe 76 PID 2196 wrote to memory of 2744 2196 cmd.exe 80 PID 2196 wrote to memory of 2744 2196 cmd.exe 80 PID 2196 wrote to memory of 2744 2196 cmd.exe 80 PID 2356 wrote to memory of 2704 2356 cmd.exe 79 PID 2356 wrote to memory of 2704 2356 cmd.exe 79 PID 2356 wrote to memory of 2704 2356 cmd.exe 79 PID 4052 wrote to memory of 2820 4052 f.bin.exe 81 PID 4052 wrote to memory of 2820 4052 f.bin.exe 81 PID 4052 wrote to memory of 2820 4052 f.bin.exe 81 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 PID 2820 wrote to memory of 196 2820 msdcsc.exe 82 - Views/modifies file attributes 1 TTPs 2 IoCs
pid Process 2704 attrib.exe 2744 attrib.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\f.bin.exe"C:\Users\Admin\AppData\Local\Temp\f.bin.exe"1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4052 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\f.bin.exe" +s +h2⤵
- Suspicious use of WriteProcessMemory
PID:2196 -
C:\Windows\SysWOW64\attrib.exeattrib "C:\Users\Admin\AppData\Local\Temp\f.bin.exe" +s +h3⤵
- Views/modifies file attributes
PID:2744
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h2⤵
- Suspicious use of WriteProcessMemory
PID:2356 -
C:\Windows\SysWOW64\attrib.exeattrib "C:\Users\Admin\AppData\Local\Temp" +s +h3⤵
- Views/modifies file attributes
PID:2704
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C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"2⤵
- Executes dropped EXE
- Windows security modification
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2820 -
C:\Windows\SysWOW64\notepad.exenotepad3⤵PID:196
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