formbook | 573d8ee9678cef8163e96937a6a5a4f14a5ade12f5646ab05550c0038c770e5d

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	z42ordemdecomprapdf.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	z42ordemdecomprapdf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\z42ordemdecomprapdf.exe = "0"	z42ordemdecomprapdf.exe

Formbook payload 1 IoCs

rat

resource	yara_rule
behavioral2/memory/2676-17-0x0000000000400000-0x000000000042F000-memory.dmp	formbook

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4976	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	z42ordemdecomprapdf.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	z42ordemdecomprapdf.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	z42ordemdecomprapdf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\z42ordemdecomprapdf.exe = "0"	z42ordemdecomprapdf.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	z42ordemdecomprapdf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	z42ordemdecomprapdf.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 624 set thread context of 2676	624	z42ordemdecomprapdf.exe	93

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2304	2676	WerFault.exe	93

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4976	powershell.exe
4976	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4976	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 624 wrote to memory of 4976	624	z42ordemdecomprapdf.exe	90
PID 624 wrote to memory of 4976	624	z42ordemdecomprapdf.exe	90
PID 624 wrote to memory of 1740	624	z42ordemdecomprapdf.exe	91
PID 624 wrote to memory of 1740	624	z42ordemdecomprapdf.exe	91
PID 624 wrote to memory of 1740	624	z42ordemdecomprapdf.exe	91
PID 624 wrote to memory of 1740	624	z42ordemdecomprapdf.exe	91
PID 624 wrote to memory of 2676	624	z42ordemdecomprapdf.exe	93
PID 624 wrote to memory of 2676	624	z42ordemdecomprapdf.exe	93
PID 624 wrote to memory of 2676	624	z42ordemdecomprapdf.exe	93
PID 624 wrote to memory of 2676	624	z42ordemdecomprapdf.exe	93
PID 624 wrote to memory of 2676	624	z42ordemdecomprapdf.exe	93
PID 624 wrote to memory of 2676	624	z42ordemdecomprapdf.exe	93
PID 624 wrote to memory of 3804	624	z42ordemdecomprapdf.exe	94
PID 624 wrote to memory of 3804	624	z42ordemdecomprapdf.exe	94
PID 624 wrote to memory of 3804	624	z42ordemdecomprapdf.exe	94

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	z42ordemdecomprapdf.exe

C:\Users\Admin\AppData\Local\Temp\z42ordemdecomprapdf.exe
"C:\Users\Admin\AppData\Local\Temp\z42ordemdecomprapdf.exe"
1⤵
- UAC bypass
- Windows security bypass
- Checks computer location settings
- Windows security modification
- Checks whether UAC is enabled
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
- System policy modification
PID:624
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\z42ordemdecomprapdf.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4976
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe"
  2⤵
  PID:1740
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe"
  2⤵
  PID:2676
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2676 -s 24
    3⤵
    - Program crash
    PID:2304
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe"
  2⤵
  PID:3804

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2676 -ip 2676
1⤵
PID:1228

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

3

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry