metasploit | b06c94d7de8534fad300f2f3fd0f8be304d25bdfd1787ea92193043fbfb9a626

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "Explorer.exe %PROGRAMFILES%\\SYSTMEM.EXE"	SYSTMEM.EXE

Modifies security service 2 TTPs 1 IoCs

evasion

Modify Registry

Windows Service

T1543.003

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\wscsvc\Start = "4"	SYSTMEM.EXE

Windows security bypass 2 TTPs 5 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusOverride = "1"	SYSTMEM.EXE
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallOverride = "1"	SYSTMEM.EXE
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	SYSTMEM.EXE
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	SYSTMEM.EXE
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "1"	SYSTMEM.EXE

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-940600906-3464502421-4240639183-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	SYSTMEM.EXE

Disables Task Manager via registry modification
evasion

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	SYSTMEM.EXE

Deletes itself 1 IoCs

pid	Process
2296	SYSTMEM.EXE

Executes dropped EXE 1 IoCs

pid	Process
2296	SYSTMEM.EXE

Identifies Wine through registry keys 2 TTPs 2 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-940600906-3464502421-4240639183-1000\Software\Wine	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe
Key opened	\REGISTRY\USER\S-1-5-21-940600906-3464502421-4240639183-1000\Software\Wine	SYSTMEM.EXE

Loads dropped DLL 2 IoCs

pid	Process
2120	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe
2120	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe

Windows security modification 2 TTPs 5 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	SYSTMEM.EXE
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	SYSTMEM.EXE
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "1"	SYSTMEM.EXE
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusOverride = "1"	SYSTMEM.EXE
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallOverride = "1"	SYSTMEM.EXE

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\SYSTMEM.EXE = "C:\\Program Files (x86)\\\\SYSTMEM.EXE"	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\SYSTMEM.EXE	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe
File opened for modification	C:\Program Files (x86)\SYSTMEM.EXE	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe
File opened for modification	C:\Program Files (x86)\SYSTMEM.EXE	SYSTMEM.EXE
File created	C:\Program Files (x86)\SYSTMEM.EXE	SYSTMEM.EXE

Modifies data under HKEY_USERS 9 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software	SYSTMEM.EXE
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion	SYSTMEM.EXE
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr = "1"	SYSTMEM.EXE
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows	SYSTMEM.EXE
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies	SYSTMEM.EXE
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System	SYSTMEM.EXE
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies\System	SYSTMEM.EXE
Key created	\REGISTRY\USER\.DEFAULT	SYSTMEM.EXE
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft	SYSTMEM.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2296	SYSTMEM.EXE
2296	SYSTMEM.EXE

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2296	SYSTMEM.EXE

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2120 wrote to memory of 2296	2120	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe	31
PID 2120 wrote to memory of 2296	2120	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe	31
PID 2120 wrote to memory of 2296	2120	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe	31
PID 2120 wrote to memory of 2296	2120	5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe	31

C:\Users\Admin\AppData\Local\Temp\5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\5b550ff46aaf92d78bb0da72372157b4_JaffaCakes118.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Loads dropped DLL
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:2120
- C:\Program Files (x86)\SYSTMEM.EXE
  "C:\Program Files (x86)\\SYSTMEM.EXE"
  2⤵
  - Modifies WinLogon for persistence
  - Modifies security service
  - Windows security bypass
  - Disables RegEdit via registry modification
  - Checks BIOS information in registry
  - Deletes itself
  - Executes dropped EXE
  - Identifies Wine through registry keys
  - Windows security modification
  - Drops file in Program Files directory
  - Modifies data under HKEY_USERS
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2296

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

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion