darkcomet | 4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2

System Information Discovery

Processes:

mcsft.exe

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

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid	Process
2364	mcsft.exe
2520	mcsft.exe

Loads dropped DLL 6 IoCs

Processes:

4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exemcsft.exe

pid	Process
2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
2364	mcsft.exe

UPX packed file 30 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/2320-0-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/files/0x0024000000014b6d-27.dat	upx
behavioral1/memory/2320-48-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2364-46-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2520-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2364-58-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2520-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-61-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-62-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-64-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-65-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-63-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-66-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-67-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-68-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-69-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-70-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-71-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-72-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-73-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-74-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-75-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-76-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-77-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-78-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-79-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2520-80-0x0000000000400000-0x00000000004B5000-memory.dmp	upx

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\Mcrosoft = "C:\\Users\\Admin\\AppData\\Roaming\\mcsft.exe"	reg.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

mcsft.exe

description	pid	Process	procid_target
PID 2364 set thread context of 2520	2364	mcsft.exe	32

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

System Information Discovery
T1082

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

Processes:

mcsft.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	mcsft.exe
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

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

System Information Discovery

Processes:

mcsft.exe

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

Suspicious use of AdjustPrivilegeToken 23 IoCs

Processes:

mcsft.exe

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2520	mcsft.exe
Token: SeSecurityPrivilege	2520	mcsft.exe
Token: SeTakeOwnershipPrivilege	2520	mcsft.exe
Token: SeLoadDriverPrivilege	2520	mcsft.exe
Token: SeSystemProfilePrivilege	2520	mcsft.exe
Token: SeSystemtimePrivilege	2520	mcsft.exe
Token: SeProfSingleProcessPrivilege	2520	mcsft.exe
Token: SeIncBasePriorityPrivilege	2520	mcsft.exe
Token: SeCreatePagefilePrivilege	2520	mcsft.exe
Token: SeBackupPrivilege	2520	mcsft.exe
Token: SeRestorePrivilege	2520	mcsft.exe
Token: SeShutdownPrivilege	2520	mcsft.exe
Token: SeDebugPrivilege	2520	mcsft.exe
Token: SeSystemEnvironmentPrivilege	2520	mcsft.exe
Token: SeChangeNotifyPrivilege	2520	mcsft.exe
Token: SeRemoteShutdownPrivilege	2520	mcsft.exe
Token: SeUndockPrivilege	2520	mcsft.exe
Token: SeManageVolumePrivilege	2520	mcsft.exe
Token: SeImpersonatePrivilege	2520	mcsft.exe
Token: SeCreateGlobalPrivilege	2520	mcsft.exe
Token: 33	2520	mcsft.exe
Token: 34	2520	mcsft.exe
Token: 35	2520	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exemcsft.exemcsft.exe

pid	Process
2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
2364	mcsft.exe
2520	mcsft.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.execmd.exemcsft.exe

description	pid	Process	procid_target
PID 2320 wrote to memory of 1092	2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	28
PID 2320 wrote to memory of 1092	2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	28
PID 2320 wrote to memory of 1092	2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	28
PID 2320 wrote to memory of 1092	2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	28
PID 1092 wrote to memory of 2624	1092	cmd.exe	30
PID 1092 wrote to memory of 2624	1092	cmd.exe	30
PID 1092 wrote to memory of 2624	1092	cmd.exe	30
PID 1092 wrote to memory of 2624	1092	cmd.exe	30
PID 2320 wrote to memory of 2364	2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	31
PID 2320 wrote to memory of 2364	2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	31
PID 2320 wrote to memory of 2364	2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	31
PID 2320 wrote to memory of 2364	2320	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	31
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32
PID 2364 wrote to memory of 2520	2364	mcsft.exe	32

C:\Users\Admin\AppData\Local\Temp\4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
"C:\Users\Admin\AppData\Local\Temp\4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2320
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\ZIfTC.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1092
- - 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
    PID:2624
- 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
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2364
- - C:\Users\Admin\AppData\Roaming\mcsft.exe
    C:\Users\Admin\AppData\Roaming\mcsft.exe
    3⤵
    - Checks BIOS information in registry
    - Executes dropped EXE
    - Checks processor information in registry
    - Enumerates system info in registry
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:2520

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