saintbot | ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03

System Information Discovery

Processes:

ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe

Drops startup file 2 IoCs

Processes:

42850.exeec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe

description	ioc	process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\42850.exe	42850.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\42850.exe	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe

Loads dropped DLL 2 IoCs

Processes:

42850.exeEhStorAuthn.exe

pid process

2756 42850.exe
1724 EhStorAuthn.exe

pid	process
2756	42850.exe
1724	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:

EhStorAuthn.exeec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe42850.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	EhStorAuthn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum	42850.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	42850.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum	EhStorAuthn.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
3944	1996	WerFault.exe	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe
1156	2756	WerFault.exe	42850.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.exeWerFault.exeEhStorAuthn.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	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

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

2088 schtasks.exe

pid	process
2088	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

5060 PING.EXE
Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

WerFault.exe42850.exeWerFault.exe

pid process

3944 WerFault.exe
3944 WerFault.exe
2756 42850.exe
2756 42850.exe
1156 WerFault.exe
1156 WerFault.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

WerFault.exe

description pid process

Token: SeRestorePrivilege 3944 WerFault.exe
Token: SeBackupPrivilege 3944 WerFault.exe

pid	process
5060	PING.EXE

pid	process
3944	WerFault.exe
3944	WerFault.exe
2756	42850.exe
2756	42850.exe
1156	WerFault.exe
1156	WerFault.exe

description	pid	process
Token: SeRestorePrivilege	3944	WerFault.exe
Token: SeBackupPrivilege	3944	WerFault.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.execmd.exeWerFault.exe42850.exeWerFault.exeEhStorAuthn.exe

description	pid	process	target process
PID 1996 wrote to memory of 2756	1996	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe	42850.exe
PID 1996 wrote to memory of 2756	1996	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe	42850.exe
PID 1996 wrote to memory of 2756	1996	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe	42850.exe
PID 1996 wrote to memory of 3776	1996	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe	cmd.exe
PID 1996 wrote to memory of 3776	1996	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe	cmd.exe
PID 1996 wrote to memory of 3776	1996	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe	cmd.exe
PID 3776 wrote to memory of 5060	3776	cmd.exe	PING.EXE
PID 3776 wrote to memory of 5060	3776	cmd.exe	PING.EXE
PID 3776 wrote to memory of 5060	3776	cmd.exe	PING.EXE
PID 4996 wrote to memory of 1996	4996	WerFault.exe	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe
PID 4996 wrote to memory of 1996	4996	WerFault.exe	ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe
PID 3776 wrote to memory of 4692	3776	cmd.exe	cmd.exe
PID 3776 wrote to memory of 4692	3776	cmd.exe	cmd.exe
PID 3776 wrote to memory of 4692	3776	cmd.exe	cmd.exe
PID 2756 wrote to memory of 1724	2756	42850.exe	EhStorAuthn.exe
PID 2756 wrote to memory of 1724	2756	42850.exe	EhStorAuthn.exe
PID 2756 wrote to memory of 1724	2756	42850.exe	EhStorAuthn.exe
PID 2756 wrote to memory of 1724	2756	42850.exe	EhStorAuthn.exe
PID 2008 wrote to memory of 2756	2008	WerFault.exe	42850.exe
PID 2008 wrote to memory of 2756	2008	WerFault.exe	42850.exe
PID 1724 wrote to memory of 2088	1724	EhStorAuthn.exe	schtasks.exe
PID 1724 wrote to memory of 2088	1724	EhStorAuthn.exe	schtasks.exe
PID 1724 wrote to memory of 2088	1724	EhStorAuthn.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe
"C:\Users\Admin\AppData\Local\Temp\ec3c0afccfef11f753a408c859d98bbba4841e87f7f1a48573270c0d82252b03.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Maps connected drives based on registry
- Suspicious use of WriteProcessMemory
PID:1996

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\42850.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\42850.exe"
2⤵
- Executes dropped EXE
- Drops startup file
- Loads dropped DLL
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2756

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:1724

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:2088

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2756 -s 632
3⤵
- Program crash
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
PID:1156

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Roaming\del.bat
2⤵
- Suspicious use of WriteProcessMemory
PID:3776

C:\Windows\SysWOW64\PING.EXE
ping localhost -n 3
3⤵
- Runs ping.exe
PID:5060

C:\Windows\SysWOW64\cmd.exe
cmd /c del "C:\Users\Admin\AppData\Roaming\del.bat"
3⤵
PID:4692

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1996 -s 908
2⤵
- Program crash
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3944

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1996 -ip 1996
1⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Suspicious use of WriteProcessMemory
PID:4996

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 2756 -ip 2756
1⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Suspicious use of WriteProcessMemory
PID:2008

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

5

System Information Discovery

5

Peripheral Device Discovery

T1120

Remote System Discovery