darkcomet | b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	win43.exe

Executes dropped EXE 2 IoCs

pid	Process
2608	win43.exe
2884	svchost.exe

Loads dropped DLL 3 IoCs

pid	Process
3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe
3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe
2608	win43.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\runAPI56 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\runAPI25.exe\""	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost.exe = "C:\\Windows\\system32\\svchost.exe"	win43.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\	win43.exe
File created	C:\Windows\SysWOW64\svchost.exe	win43.exe
File opened for modification	C:\Windows\SysWOW64\svchost.exe	win43.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3056 set thread context of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30

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 3 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	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	win43.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DllHost.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	win43.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	win43.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	win43.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	win43.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	win43.exe

Suspicious use of AdjustPrivilegeToken 23 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2608	win43.exe
Token: SeSecurityPrivilege	2608	win43.exe
Token: SeTakeOwnershipPrivilege	2608	win43.exe
Token: SeLoadDriverPrivilege	2608	win43.exe
Token: SeSystemProfilePrivilege	2608	win43.exe
Token: SeSystemtimePrivilege	2608	win43.exe
Token: SeProfSingleProcessPrivilege	2608	win43.exe
Token: SeIncBasePriorityPrivilege	2608	win43.exe
Token: SeCreatePagefilePrivilege	2608	win43.exe
Token: SeBackupPrivilege	2608	win43.exe
Token: SeRestorePrivilege	2608	win43.exe
Token: SeShutdownPrivilege	2608	win43.exe
Token: SeDebugPrivilege	2608	win43.exe
Token: SeSystemEnvironmentPrivilege	2608	win43.exe
Token: SeChangeNotifyPrivilege	2608	win43.exe
Token: SeRemoteShutdownPrivilege	2608	win43.exe
Token: SeUndockPrivilege	2608	win43.exe
Token: SeManageVolumePrivilege	2608	win43.exe
Token: SeImpersonatePrivilege	2608	win43.exe
Token: SeCreateGlobalPrivilege	2608	win43.exe
Token: 33	2608	win43.exe
Token: 34	2608	win43.exe
Token: 35	2608	win43.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
2736	DllHost.exe
2736	DllHost.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 3056 wrote to memory of 2608	3056	b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe	30
PID 2608 wrote to memory of 2884	2608	win43.exe	32
PID 2608 wrote to memory of 2884	2608	win43.exe	32
PID 2608 wrote to memory of 2884	2608	win43.exe	32
PID 2608 wrote to memory of 2884	2608	win43.exe	32

C:\Users\Admin\AppData\Local\Temp\b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe
"C:\Users\Admin\AppData\Local\Temp\b87f0f653890bf6ee2ea43b37bb4d17fe8cbf123db499f85bc1af7cf0f8d3320N.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3056
- C:\Users\Admin\AppData\Local\Temp\win43.exe
  C:\Users\Admin\AppData\Local\Temp\win43.exe
  2⤵
  - Modifies WinLogon for persistence
  - Checks BIOS information in registry
  - Executes dropped EXE
  - Loads dropped DLL
  - Adds Run key to start application
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2608
- - C:\Windows\SysWOW64\svchost.exe
    "C:\Windows\system32\svchost.exe"
    3⤵
    - Executes dropped EXE
    PID:2884

C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of FindShellTrayWindow
PID:2736

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

3

System Information Discovery

4

System Location Discovery

T1614

System Language Discovery