darkcomet | 25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be

System Information Discovery

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

Executes dropped EXE 2 IoCs

pid	Process
2776	mcsft.exe
2408	mcsft.exe

Loads dropped DLL 6 IoCs

pid	Process
2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
2776	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-1-5-21-2039016743-699959520-214465309-1000\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 2776 set thread context of 2408	2776	mcsft.exe	35

UPX packed file 33 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2708-2-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral1/files/0x000d000000016cfd-27.dat	upx
behavioral1/memory/2776-46-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral1/memory/2708-43-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral1/memory/2708-42-0x00000000039B0000-0x0000000003D79000-memory.dmp	upx
behavioral1/memory/2408-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2776-54-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral1/memory/2408-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-61-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-62-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2708-63-0x00000000039B0000-0x0000000003D79000-memory.dmp	upx
behavioral1/memory/2408-64-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-65-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-66-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-67-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-68-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-69-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-70-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-71-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-72-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-73-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-74-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-75-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-76-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-77-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-78-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2408-79-0x0000000000400000-0x00000000004B5000-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	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.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 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
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	mcsft.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	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	2408	mcsft.exe
Token: SeSecurityPrivilege	2408	mcsft.exe
Token: SeTakeOwnershipPrivilege	2408	mcsft.exe
Token: SeLoadDriverPrivilege	2408	mcsft.exe
Token: SeSystemProfilePrivilege	2408	mcsft.exe
Token: SeSystemtimePrivilege	2408	mcsft.exe
Token: SeProfSingleProcessPrivilege	2408	mcsft.exe
Token: SeIncBasePriorityPrivilege	2408	mcsft.exe
Token: SeCreatePagefilePrivilege	2408	mcsft.exe
Token: SeBackupPrivilege	2408	mcsft.exe
Token: SeRestorePrivilege	2408	mcsft.exe
Token: SeShutdownPrivilege	2408	mcsft.exe
Token: SeDebugPrivilege	2408	mcsft.exe
Token: SeSystemEnvironmentPrivilege	2408	mcsft.exe
Token: SeChangeNotifyPrivilege	2408	mcsft.exe
Token: SeRemoteShutdownPrivilege	2408	mcsft.exe
Token: SeUndockPrivilege	2408	mcsft.exe
Token: SeManageVolumePrivilege	2408	mcsft.exe
Token: SeImpersonatePrivilege	2408	mcsft.exe
Token: SeCreateGlobalPrivilege	2408	mcsft.exe
Token: 33	2408	mcsft.exe
Token: 34	2408	mcsft.exe
Token: 35	2408	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
2776	mcsft.exe
2408	mcsft.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2708 wrote to memory of 768	2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	31
PID 2708 wrote to memory of 768	2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	31
PID 2708 wrote to memory of 768	2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	31
PID 2708 wrote to memory of 768	2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	31
PID 768 wrote to memory of 2960	768	cmd.exe	33
PID 768 wrote to memory of 2960	768	cmd.exe	33
PID 768 wrote to memory of 2960	768	cmd.exe	33
PID 768 wrote to memory of 2960	768	cmd.exe	33
PID 2708 wrote to memory of 2776	2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	34
PID 2708 wrote to memory of 2776	2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	34
PID 2708 wrote to memory of 2776	2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	34
PID 2708 wrote to memory of 2776	2708	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	34
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35
PID 2776 wrote to memory of 2408	2776	mcsft.exe	35

C:\Users\Admin\AppData\Local\Temp\25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
"C:\Users\Admin\AppData\Local\Temp\25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2708
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\zIgXC.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:768
- - 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:2960
- 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:2776
- - 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:2408

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