darkcomet | bbd03c255d076b019dc9b6c865e54c98a27043d63f846c480a8d64f51fcbed56

System Information Discovery

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

Executes dropped EXE 2 IoCs

pid	Process
2748	rFEUYaSrHy.exe
2792	GcbEk.exe.exe

Loads dropped DLL 2 IoCs

pid	Process
2432	6b3d08408196136d53b87a35edd27aac_JaffaCakes118.exe
2432	6b3d08408196136d53b87a35edd27aac_JaffaCakes118.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-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost.exe = "C:\\Windows\\system32\\system32\\svchost"	GcbEk.exe.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\system32\svchost	GcbEk.exe.exe
File opened for modification	C:\Windows\SysWOW64\system32\svchost	GcbEk.exe.exe
File opened for modification	C:\Windows\SysWOW64\system32\	GcbEk.exe.exe

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 2 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	GcbEk.exe.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	6b3d08408196136d53b87a35edd27aac_JaffaCakes118.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	GcbEk.exe.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	GcbEk.exe.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	GcbEk.exe.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	GcbEk.exe.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	GcbEk.exe.exe

Suspicious use of AdjustPrivilegeToken 23 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2792	GcbEk.exe.exe
Token: SeSecurityPrivilege	2792	GcbEk.exe.exe
Token: SeTakeOwnershipPrivilege	2792	GcbEk.exe.exe
Token: SeLoadDriverPrivilege	2792	GcbEk.exe.exe
Token: SeSystemProfilePrivilege	2792	GcbEk.exe.exe
Token: SeSystemtimePrivilege	2792	GcbEk.exe.exe
Token: SeProfSingleProcessPrivilege	2792	GcbEk.exe.exe
Token: SeIncBasePriorityPrivilege	2792	GcbEk.exe.exe
Token: SeCreatePagefilePrivilege	2792	GcbEk.exe.exe
Token: SeBackupPrivilege	2792	GcbEk.exe.exe
Token: SeRestorePrivilege	2792	GcbEk.exe.exe
Token: SeShutdownPrivilege	2792	GcbEk.exe.exe
Token: SeDebugPrivilege	2792	GcbEk.exe.exe
Token: SeSystemEnvironmentPrivilege	2792	GcbEk.exe.exe
Token: SeChangeNotifyPrivilege	2792	GcbEk.exe.exe
Token: SeRemoteShutdownPrivilege	2792	GcbEk.exe.exe
Token: SeUndockPrivilege	2792	GcbEk.exe.exe
Token: SeManageVolumePrivilege	2792	GcbEk.exe.exe
Token: SeImpersonatePrivilege	2792	GcbEk.exe.exe
Token: SeCreateGlobalPrivilege	2792	GcbEk.exe.exe
Token: 33	2792	GcbEk.exe.exe
Token: 34	2792	GcbEk.exe.exe
Token: 35	2792	GcbEk.exe.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2432 wrote to memory of 2748	2432	6b3d08408196136d53b87a35edd27aac_JaffaCakes118.exe	30
PID 2432 wrote to memory of 2748	2432	6b3d08408196136d53b87a35edd27aac_JaffaCakes118.exe	30
PID 2432 wrote to memory of 2748	2432	6b3d08408196136d53b87a35edd27aac_JaffaCakes118.exe	30
PID 2432 wrote to memory of 2748	2432	6b3d08408196136d53b87a35edd27aac_JaffaCakes118.exe	30
PID 2748 wrote to memory of 2792	2748	rFEUYaSrHy.exe	31
PID 2748 wrote to memory of 2792	2748	rFEUYaSrHy.exe	31
PID 2748 wrote to memory of 2792	2748	rFEUYaSrHy.exe	31
PID 2748 wrote to memory of 2792	2748	rFEUYaSrHy.exe	31

C:\Users\Admin\AppData\Local\Temp\6b3d08408196136d53b87a35edd27aac_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\6b3d08408196136d53b87a35edd27aac_JaffaCakes118.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2432
- C:\Users\Admin\AppData\Local\Temp\rFEUYaSrHy.exe
  "C:\Users\Admin\AppData\Local\Temp\rFEUYaSrHy.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:2748
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\GcbEk.exe.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\GcbEk.exe.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Checks BIOS information in registry
    - Executes dropped EXE
    - Adds Run key to start application
    - Drops file in System32 directory
    - System Location Discovery: System Language Discovery
    - Checks processor information in registry
    - Enumerates system info in registry
    - Suspicious use of AdjustPrivilegeToken
    PID:2792

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

3

System Information Discovery

4

System Location Discovery

T1614

System Language Discovery