darkcomet | bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a

System Information Discovery

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

Executes dropped EXE 2 IoCs

pid	Process
2872	mcsft.exe
2920	mcsft.exe

Loads dropped DLL 6 IoCs

pid	Process
1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe
1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe
1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe
1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe
1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe
2872	mcsft.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-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\Mcrosoft = "C:\\Users\\Admin\\AppData\\Roaming\\mcsft.exe"	reg.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2872 set thread context of 2920	2872	mcsft.exe	34

UPX packed file 31 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1388-2-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/files/0x0009000000015d59-38.dat	upx
behavioral1/memory/1388-43-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2920-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2872-48-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2920-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2872-52-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2920-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-61-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-62-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/1388-63-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2920-64-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-65-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-66-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-67-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-68-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-69-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-70-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-71-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-72-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-73-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-74-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-75-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-76-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-77-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2920-78-0x0000000000400000-0x00000000004B5000-memory.dmp	upx

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 5 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	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mcsft.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mcsft.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	mcsft.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	mcsft.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	mcsft.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	mcsft.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	mcsft.exe

Suspicious use of AdjustPrivilegeToken 23 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2920	mcsft.exe
Token: SeSecurityPrivilege	2920	mcsft.exe
Token: SeTakeOwnershipPrivilege	2920	mcsft.exe
Token: SeLoadDriverPrivilege	2920	mcsft.exe
Token: SeSystemProfilePrivilege	2920	mcsft.exe
Token: SeSystemtimePrivilege	2920	mcsft.exe
Token: SeProfSingleProcessPrivilege	2920	mcsft.exe
Token: SeIncBasePriorityPrivilege	2920	mcsft.exe
Token: SeCreatePagefilePrivilege	2920	mcsft.exe
Token: SeBackupPrivilege	2920	mcsft.exe
Token: SeRestorePrivilege	2920	mcsft.exe
Token: SeShutdownPrivilege	2920	mcsft.exe
Token: SeDebugPrivilege	2920	mcsft.exe
Token: SeSystemEnvironmentPrivilege	2920	mcsft.exe
Token: SeChangeNotifyPrivilege	2920	mcsft.exe
Token: SeRemoteShutdownPrivilege	2920	mcsft.exe
Token: SeUndockPrivilege	2920	mcsft.exe
Token: SeManageVolumePrivilege	2920	mcsft.exe
Token: SeImpersonatePrivilege	2920	mcsft.exe
Token: SeCreateGlobalPrivilege	2920	mcsft.exe
Token: 33	2920	mcsft.exe
Token: 34	2920	mcsft.exe
Token: 35	2920	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe
2872	mcsft.exe
2920	mcsft.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1388 wrote to memory of 2528	1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe	30
PID 1388 wrote to memory of 2528	1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe	30
PID 1388 wrote to memory of 2528	1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe	30
PID 1388 wrote to memory of 2528	1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe	30
PID 2528 wrote to memory of 2556	2528	cmd.exe	32
PID 2528 wrote to memory of 2556	2528	cmd.exe	32
PID 2528 wrote to memory of 2556	2528	cmd.exe	32
PID 2528 wrote to memory of 2556	2528	cmd.exe	32
PID 1388 wrote to memory of 2872	1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe	33
PID 1388 wrote to memory of 2872	1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe	33
PID 1388 wrote to memory of 2872	1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe	33
PID 1388 wrote to memory of 2872	1388	bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe	33
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34
PID 2872 wrote to memory of 2920	2872	mcsft.exe	34

C:\Users\Admin\AppData\Local\Temp\bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe
"C:\Users\Admin\AppData\Local\Temp\bfc2324ddd5fd33c825bae046d89fe4f3ef80c929cfca0ae093d451eca61e90a.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1388
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\DSoBR.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2528
- - C:\Windows\SysWOW64\reg.exe
    REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "Mcrosoft" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\mcsft.exe" /f
    3⤵
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    PID:2556
- C:\Users\Admin\AppData\Roaming\mcsft.exe
  "C:\Users\Admin\AppData\Roaming\mcsft.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2872
- - C:\Users\Admin\AppData\Roaming\mcsft.exe
    C:\Users\Admin\AppData\Roaming\mcsft.exe
    3⤵
    - 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 use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:2920

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

4

System Location Discovery

T1614

System Language Discovery