darkcomet | 75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43

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:

75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid	Process
5100	mcsft.exe
4448	mcsft.exe

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-1-5-21-2437139445-1151884604-3026847218-1000\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 5100 set thread context of 4448	5100	mcsft.exe	90

UPX packed file 21 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/3916-0-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/files/0x0008000000023cb5-16.dat	upx
behavioral2/memory/3916-29-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/4448-32-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-34-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5100-36-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/4448-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-46-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4448-60-0x0000000000400000-0x00000000004B5000-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

Processes:

mcsft.exe75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.execmd.exereg.exemcsft.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mcsft.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.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

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	4448	mcsft.exe
Token: SeSecurityPrivilege	4448	mcsft.exe
Token: SeTakeOwnershipPrivilege	4448	mcsft.exe
Token: SeLoadDriverPrivilege	4448	mcsft.exe
Token: SeSystemProfilePrivilege	4448	mcsft.exe
Token: SeSystemtimePrivilege	4448	mcsft.exe
Token: SeProfSingleProcessPrivilege	4448	mcsft.exe
Token: SeIncBasePriorityPrivilege	4448	mcsft.exe
Token: SeCreatePagefilePrivilege	4448	mcsft.exe
Token: SeBackupPrivilege	4448	mcsft.exe
Token: SeRestorePrivilege	4448	mcsft.exe
Token: SeShutdownPrivilege	4448	mcsft.exe
Token: SeDebugPrivilege	4448	mcsft.exe
Token: SeSystemEnvironmentPrivilege	4448	mcsft.exe
Token: SeChangeNotifyPrivilege	4448	mcsft.exe
Token: SeRemoteShutdownPrivilege	4448	mcsft.exe
Token: SeUndockPrivilege	4448	mcsft.exe
Token: SeManageVolumePrivilege	4448	mcsft.exe
Token: SeImpersonatePrivilege	4448	mcsft.exe
Token: SeCreateGlobalPrivilege	4448	mcsft.exe
Token: 33	4448	mcsft.exe
Token: 34	4448	mcsft.exe
Token: 35	4448	mcsft.exe
Token: 36	4448	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exemcsft.exemcsft.exe

pid	Process
3916	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe
5100	mcsft.exe
4448	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.execmd.exemcsft.exe

description	pid	Process	procid_target
PID 3916 wrote to memory of 3420	3916	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe	85
PID 3916 wrote to memory of 3420	3916	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe	85
PID 3916 wrote to memory of 3420	3916	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe	85
PID 3420 wrote to memory of 1944	3420	cmd.exe	88
PID 3420 wrote to memory of 1944	3420	cmd.exe	88
PID 3420 wrote to memory of 1944	3420	cmd.exe	88
PID 3916 wrote to memory of 5100	3916	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe	89
PID 3916 wrote to memory of 5100	3916	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe	89
PID 3916 wrote to memory of 5100	3916	75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe	89
PID 5100 wrote to memory of 4448	5100	mcsft.exe	90
PID 5100 wrote to memory of 4448	5100	mcsft.exe	90
PID 5100 wrote to memory of 4448	5100	mcsft.exe	90
PID 5100 wrote to memory of 4448	5100	mcsft.exe	90
PID 5100 wrote to memory of 4448	5100	mcsft.exe	90
PID 5100 wrote to memory of 4448	5100	mcsft.exe	90
PID 5100 wrote to memory of 4448	5100	mcsft.exe	90
PID 5100 wrote to memory of 4448	5100	mcsft.exe	90

C:\Users\Admin\AppData\Local\Temp\75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe
"C:\Users\Admin\AppData\Local\Temp\75c8a77f157742e25d97e38062bcb197f71eefde6ede1810425c75c98c109f43.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3916
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\MHGBP.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3420
- - 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:1944
- C:\Users\Admin\AppData\Roaming\mcsft.exe
  "C:\Users\Admin\AppData\Roaming\mcsft.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5100
- - 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:4448

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

System Location Discovery

T1614

System Language Discovery