darkcomet | 1f43c14aca004721c246d400425587d99104d466d46a9075c84e8c6ec6c2b136

System Information Discovery

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

Executes dropped EXE 1 IoCs

pid	Process
6032	iexplorer.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-1-5-21-814918696-1585701690-3140955116-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdate.exe = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\winupdate.exe\""	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5240 set thread context of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88

UPX packed file 28 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/6032-12-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-17-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-18-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-20-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-22-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-27-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-28-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-26-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-25-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-23-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-19-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-29-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-30-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-31-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-32-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-33-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-34-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-35-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/6032-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\assembly\Desktop.ini	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\iexplorer.exe	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe
File opened for modification	C:\Windows\Microsoft.NET\Framework\v2.0.50727\iexplorer.exe	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe
File opened for modification	C:\Windows\assembly	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe
File created	C:\Windows\assembly\Desktop.ini	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe

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	iexplorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.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	iexplorer.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	iexplorer.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	iexplorer.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	iexplorer.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	iexplorer.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
6032	iexplorer.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	6032	iexplorer.exe
Token: SeSecurityPrivilege	6032	iexplorer.exe
Token: SeTakeOwnershipPrivilege	6032	iexplorer.exe
Token: SeLoadDriverPrivilege	6032	iexplorer.exe
Token: SeSystemProfilePrivilege	6032	iexplorer.exe
Token: SeSystemtimePrivilege	6032	iexplorer.exe
Token: SeProfSingleProcessPrivilege	6032	iexplorer.exe
Token: SeIncBasePriorityPrivilege	6032	iexplorer.exe
Token: SeCreatePagefilePrivilege	6032	iexplorer.exe
Token: SeBackupPrivilege	6032	iexplorer.exe
Token: SeRestorePrivilege	6032	iexplorer.exe
Token: SeShutdownPrivilege	6032	iexplorer.exe
Token: SeDebugPrivilege	6032	iexplorer.exe
Token: SeSystemEnvironmentPrivilege	6032	iexplorer.exe
Token: SeChangeNotifyPrivilege	6032	iexplorer.exe
Token: SeRemoteShutdownPrivilege	6032	iexplorer.exe
Token: SeUndockPrivilege	6032	iexplorer.exe
Token: SeManageVolumePrivilege	6032	iexplorer.exe
Token: SeImpersonatePrivilege	6032	iexplorer.exe
Token: SeCreateGlobalPrivilege	6032	iexplorer.exe
Token: 33	6032	iexplorer.exe
Token: 34	6032	iexplorer.exe
Token: 35	6032	iexplorer.exe
Token: 36	6032	iexplorer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
6032	iexplorer.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 5240 wrote to memory of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88
PID 5240 wrote to memory of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88
PID 5240 wrote to memory of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88
PID 5240 wrote to memory of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88
PID 5240 wrote to memory of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88
PID 5240 wrote to memory of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88
PID 5240 wrote to memory of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88
PID 5240 wrote to memory of 6032	5240	JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe	88

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_822fa2afa7f2a8665ee145ccd950f5ca.exe"
1⤵
- Adds Run key to start application
- Drops desktop.ini file(s)
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5240
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\iexplorer.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\iexplorer.exe
  2⤵
  - Disables RegEdit via registry modification
  - Drops file in Drivers directory
  - Checks BIOS information in registry
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:6032

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

3

System Information Discovery

3

System Location Discovery

T1614

System Language Discovery