darkcomet | 4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2

System Information Discovery

Processes:

mcsft.exe

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

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

System Information Discovery

Processes:

4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-711569230-3659488422-571408806-1000\Control Panel\International\Geo\Nation	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid	Process
3756	mcsft.exe
2416	mcsft.exe

UPX packed file 29 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4548-0-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/files/0x0008000000023440-16.dat	upx
behavioral2/memory/4548-30-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/3756-28-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/2416-33-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-35-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3756-38-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/2416-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-46-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-48-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2416-59-0x0000000000400000-0x00000000004B5000-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-1-5-21-711569230-3659488422-571408806-1000\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 3756 set thread context of 2416	3756	mcsft.exe	89

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 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

Processes:

mcsft.exe

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

Suspicious use of AdjustPrivilegeToken 24 IoCs

Processes:

mcsft.exe

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2416	mcsft.exe
Token: SeSecurityPrivilege	2416	mcsft.exe
Token: SeTakeOwnershipPrivilege	2416	mcsft.exe
Token: SeLoadDriverPrivilege	2416	mcsft.exe
Token: SeSystemProfilePrivilege	2416	mcsft.exe
Token: SeSystemtimePrivilege	2416	mcsft.exe
Token: SeProfSingleProcessPrivilege	2416	mcsft.exe
Token: SeIncBasePriorityPrivilege	2416	mcsft.exe
Token: SeCreatePagefilePrivilege	2416	mcsft.exe
Token: SeBackupPrivilege	2416	mcsft.exe
Token: SeRestorePrivilege	2416	mcsft.exe
Token: SeShutdownPrivilege	2416	mcsft.exe
Token: SeDebugPrivilege	2416	mcsft.exe
Token: SeSystemEnvironmentPrivilege	2416	mcsft.exe
Token: SeChangeNotifyPrivilege	2416	mcsft.exe
Token: SeRemoteShutdownPrivilege	2416	mcsft.exe
Token: SeUndockPrivilege	2416	mcsft.exe
Token: SeManageVolumePrivilege	2416	mcsft.exe
Token: SeImpersonatePrivilege	2416	mcsft.exe
Token: SeCreateGlobalPrivilege	2416	mcsft.exe
Token: 33	2416	mcsft.exe
Token: 34	2416	mcsft.exe
Token: 35	2416	mcsft.exe
Token: 36	2416	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exemcsft.exemcsft.exe

pid	Process
4548	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
3756	mcsft.exe
2416	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.execmd.exemcsft.exe

description	pid	Process	procid_target
PID 4548 wrote to memory of 1236	4548	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	83
PID 4548 wrote to memory of 1236	4548	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	83
PID 4548 wrote to memory of 1236	4548	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	83
PID 1236 wrote to memory of 3768	1236	cmd.exe	86
PID 1236 wrote to memory of 3768	1236	cmd.exe	86
PID 1236 wrote to memory of 3768	1236	cmd.exe	86
PID 4548 wrote to memory of 3756	4548	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	88
PID 4548 wrote to memory of 3756	4548	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	88
PID 4548 wrote to memory of 3756	4548	4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe	88
PID 3756 wrote to memory of 2416	3756	mcsft.exe	89
PID 3756 wrote to memory of 2416	3756	mcsft.exe	89
PID 3756 wrote to memory of 2416	3756	mcsft.exe	89
PID 3756 wrote to memory of 2416	3756	mcsft.exe	89
PID 3756 wrote to memory of 2416	3756	mcsft.exe	89
PID 3756 wrote to memory of 2416	3756	mcsft.exe	89
PID 3756 wrote to memory of 2416	3756	mcsft.exe	89
PID 3756 wrote to memory of 2416	3756	mcsft.exe	89

C:\Users\Admin\AppData\Local\Temp\4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe
"C:\Users\Admin\AppData\Local\Temp\4ee8149d053184567f4353b414aa705e444c3fcd22d03c20e46df3b10d981dd2.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4548
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\nreXV.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1236
- - 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:3768
- C:\Users\Admin\AppData\Roaming\mcsft.exe
  "C:\Users\Admin\AppData\Roaming\mcsft.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3756
- - 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:2416

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

4

System Information Discovery

5