saintbot | b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42

System Information Discovery

Processes:

b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe

Drops startup file 2 IoCs

Processes:

b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe27718.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\27718.exe	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\27718.exe	27718.exe

Loads dropped DLL 2 IoCs

Processes:

27718.exeEhStorAuthn.exe

pid process

3688 27718.exe
4128 EhStorAuthn.exe

pid	process
3688	27718.exe
4128	EhStorAuthn.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

EhStorAuthn.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "C:\\Users\\Admin\\AppData\\Local\\z_Admin\\Admin.vbs"	EhStorAuthn.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Maps connected drives based on registry 3 TTPs 6 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

Processes:

b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe27718.exeEhStorAuthn.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum	27718.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	27718.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum	EhStorAuthn.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	EhStorAuthn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe

Drops file in System32 directory 1 IoCs

Processes:

EhStorAuthn.exe

description ioc process

File opened for modification C:\Windows\SysWOW64\EhStorAuthn.exe EhStorAuthn.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\EhStorAuthn.exe	EhStorAuthn.exe

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	process	target process
4164	2456	WerFault.exe	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe
2192	3688	WerFault.exe	27718.exe

Checks processor information in registry 2 TTPs 8 IoCs

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

Query Registry

System Information Discovery

Processes:

WerFault.exeEhStorAuthn.exeWerFault.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WerFault.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	EhStorAuthn.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EhStorAuthn.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WerFault.exe

Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

3340 schtasks.exe

pid	process
3340	schtasks.exe

Enumerates system info in registry 2 TTPs 4 IoCs

Query Registry

System Information Discovery

Processes:

WerFault.exeWerFault.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WerFault.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WerFault.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

3512 PING.EXE
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

WerFault.exeWerFault.exe

pid process

4164 WerFault.exe
4164 WerFault.exe
2192 WerFault.exe
2192 WerFault.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

WerFault.exe

description pid process

Token: SeRestorePrivilege 4164 WerFault.exe
Token: SeBackupPrivilege 4164 WerFault.exe

pid	process
3512	PING.EXE

pid	process
4164	WerFault.exe
4164	WerFault.exe
2192	WerFault.exe
2192	WerFault.exe

description	pid	process
Token: SeRestorePrivilege	4164	WerFault.exe
Token: SeBackupPrivilege	4164	WerFault.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.execmd.exeWerFault.exe27718.exeWerFault.exeEhStorAuthn.exe

description	pid	process	target process
PID 2456 wrote to memory of 3688	2456	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe	27718.exe
PID 2456 wrote to memory of 3688	2456	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe	27718.exe
PID 2456 wrote to memory of 3688	2456	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe	27718.exe
PID 2456 wrote to memory of 3560	2456	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe	cmd.exe
PID 2456 wrote to memory of 3560	2456	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe	cmd.exe
PID 2456 wrote to memory of 3560	2456	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe	cmd.exe
PID 3560 wrote to memory of 3512	3560	cmd.exe	PING.EXE
PID 3560 wrote to memory of 3512	3560	cmd.exe	PING.EXE
PID 3560 wrote to memory of 3512	3560	cmd.exe	PING.EXE
PID 3464 wrote to memory of 2456	3464	WerFault.exe	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe
PID 3464 wrote to memory of 2456	3464	WerFault.exe	b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe
PID 3560 wrote to memory of 5100	3560	cmd.exe	cmd.exe
PID 3560 wrote to memory of 5100	3560	cmd.exe	cmd.exe
PID 3560 wrote to memory of 5100	3560	cmd.exe	cmd.exe
PID 3688 wrote to memory of 4128	3688	27718.exe	EhStorAuthn.exe
PID 3688 wrote to memory of 4128	3688	27718.exe	EhStorAuthn.exe
PID 3688 wrote to memory of 4128	3688	27718.exe	EhStorAuthn.exe
PID 3688 wrote to memory of 4128	3688	27718.exe	EhStorAuthn.exe
PID 2560 wrote to memory of 3688	2560	WerFault.exe	27718.exe
PID 2560 wrote to memory of 3688	2560	WerFault.exe	27718.exe
PID 4128 wrote to memory of 3340	4128	EhStorAuthn.exe	schtasks.exe
PID 4128 wrote to memory of 3340	4128	EhStorAuthn.exe	schtasks.exe
PID 4128 wrote to memory of 3340	4128	EhStorAuthn.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe
"C:\Users\Admin\AppData\Local\Temp\b1af67bcfaa99c369960580f86e7c1a42fc473dd85a0a4d3b1c989a6bc138a42.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Maps connected drives based on registry
- Suspicious use of WriteProcessMemory
PID:2456
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\27718.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\27718.exe"
  2⤵
  - Executes dropped EXE
  - Drops startup file
  - Loads dropped DLL
  - Maps connected drives based on registry
  - Suspicious use of WriteProcessMemory
  PID:3688
- - C:\Windows\SysWOW64\EhStorAuthn.exe
    "C:\Windows\System32\EhStorAuthn.exe"
    3⤵
    - Loads dropped DLL
    - Adds Run key to start application
    - Maps connected drives based on registry
    - Drops file in System32 directory
    - Checks processor information in registry
    - Suspicious use of WriteProcessMemory
    PID:4128
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc minute /mo 5 /tn "Maintenance" /tr "C:\Users\%USERNAME%\AppData\Local\z_%USERNAME%\%USERNAME%.vbs" /F
      4⤵
      Creates scheduled task(s)
      PID:3340
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3688 -s 620
    3⤵
    - Program crash
    - Checks processor information in registry
    - Enumerates system info in registry
    - Suspicious behavior: EnumeratesProcesses
    PID:2192
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Roaming\del.bat
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3560
- - C:\Windows\SysWOW64\PING.EXE
    ping localhost -n 3
    3⤵
    - Runs ping.exe
    PID:3512
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c del "C:\Users\Admin\AppData\Roaming\del.bat"
    3⤵
    PID:5100
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2456 -s 1144
  2⤵
  - Program crash
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4164

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2456 -ip 2456
1⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Suspicious use of WriteProcessMemory
PID:3464

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 3688 -ip 3688
1⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Suspicious use of WriteProcessMemory
PID:2560

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

T1018

System Information Discovery

5