darkcomet | a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	rBR1L8UpFut4.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	rBR1L8UpFut4.exe

Executes dropped EXE 2 IoCs

pid	Process
3256	rBR1L8UpFut4.exe
2152	server.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\server = "C:\\Windows\\system32\\Dosya\\server.exe"	rBR1L8UpFut4.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Dosya\	rBR1L8UpFut4.exe
File created	C:\Windows\SysWOW64\Dosya\server.exe	rBR1L8UpFut4.exe
File opened for modification	C:\Windows\SysWOW64\Dosya\server.exe	rBR1L8UpFut4.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2260 set thread context of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 3256 set thread context of 4552	3256	rBR1L8UpFut4.exe	93

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rBR1L8UpFut4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	server.exe

Checks processor information in registry 2 TTPs 4 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rBR1L8UpFut4.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rBR1L8UpFut4.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	rBR1L8UpFut4.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	rBR1L8UpFut4.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	rBR1L8UpFut4.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	3256	rBR1L8UpFut4.exe
Token: SeSecurityPrivilege	3256	rBR1L8UpFut4.exe
Token: SeTakeOwnershipPrivilege	3256	rBR1L8UpFut4.exe
Token: SeLoadDriverPrivilege	3256	rBR1L8UpFut4.exe
Token: SeSystemProfilePrivilege	3256	rBR1L8UpFut4.exe
Token: SeSystemtimePrivilege	3256	rBR1L8UpFut4.exe
Token: SeProfSingleProcessPrivilege	3256	rBR1L8UpFut4.exe
Token: SeIncBasePriorityPrivilege	3256	rBR1L8UpFut4.exe
Token: SeCreatePagefilePrivilege	3256	rBR1L8UpFut4.exe
Token: SeBackupPrivilege	3256	rBR1L8UpFut4.exe
Token: SeRestorePrivilege	3256	rBR1L8UpFut4.exe
Token: SeShutdownPrivilege	3256	rBR1L8UpFut4.exe
Token: SeDebugPrivilege	3256	rBR1L8UpFut4.exe
Token: SeSystemEnvironmentPrivilege	3256	rBR1L8UpFut4.exe
Token: SeChangeNotifyPrivilege	3256	rBR1L8UpFut4.exe
Token: SeRemoteShutdownPrivilege	3256	rBR1L8UpFut4.exe
Token: SeUndockPrivilege	3256	rBR1L8UpFut4.exe
Token: SeManageVolumePrivilege	3256	rBR1L8UpFut4.exe
Token: SeImpersonatePrivilege	3256	rBR1L8UpFut4.exe
Token: SeCreateGlobalPrivilege	3256	rBR1L8UpFut4.exe
Token: 33	3256	rBR1L8UpFut4.exe
Token: 34	3256	rBR1L8UpFut4.exe
Token: 35	3256	rBR1L8UpFut4.exe
Token: 36	3256	rBR1L8UpFut4.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 2260 wrote to memory of 3256	2260	a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe	87
PID 3256 wrote to memory of 4552	3256	rBR1L8UpFut4.exe	93
PID 3256 wrote to memory of 4552	3256	rBR1L8UpFut4.exe	93
PID 3256 wrote to memory of 4552	3256	rBR1L8UpFut4.exe	93
PID 3256 wrote to memory of 4552	3256	rBR1L8UpFut4.exe	93
PID 3256 wrote to memory of 4552	3256	rBR1L8UpFut4.exe	93
PID 3256 wrote to memory of 2152	3256	rBR1L8UpFut4.exe	95
PID 3256 wrote to memory of 2152	3256	rBR1L8UpFut4.exe	95
PID 3256 wrote to memory of 2152	3256	rBR1L8UpFut4.exe	95

C:\Users\Admin\AppData\Local\Temp\a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe
"C:\Users\Admin\AppData\Local\Temp\a37ac7f3d02f5d8b616ce794f064257022199150ed96319d8ff1a8ef7d29ad78N.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2260
- C:\Users\Admin\AppData\Local\Temp\rBR1L8UpFut4.exe
  C:\Users\Admin\AppData\Local\Temp\rBR1L8UpFut4.exe
  2⤵
  - Modifies WinLogon for persistence
  - Checks BIOS information in registry
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in System32 directory
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3256
- - C:\Windows\SysWOW64\explorer.exe
    "C:\Windows\SysWOW64\explorer.exe"
    3⤵
    PID:4552
- - C:\Windows\SysWOW64\Dosya\server.exe
    "C:\Windows\system32\Dosya\server.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2152

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

4

System Information Discovery

5

System Location Discovery

T1614

System Language Discovery