quasar | 459a5f0643c4e76c893adb6b357d735a0a2cce36025e55e57b04d48dd757aa12

Virtualization/Sandbox Evasion

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exestеamwеbhеlper.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	stеamwеbhеlper.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	stеamwеbhеlper.exe

Checks BIOS information in registry 2 TTPs 6 IoCs

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

Query Registry

System Information Discovery

T1082

Processes:

stеamwеbhеlper.exe90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	stеamwеbhеlper.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	stеamwеbhеlper.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	stеamwеbhеlper.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	stеamwеbhеlper.exe

Executes dropped EXE 2 IoCs

Processes:

stеamwеbhеlper.exestеamwеbhеlper.exe

pid process

2672 stеamwеbhеlper.exe
1048 stеamwеbhеlper.exe

pid	process
2672	stеamwеbhеlper.exe
1048	stеamwеbhеlper.exe

Identifies Wine through registry keys 2 TTPs 3 IoCs

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

evasion

Query Registry

Virtualization/Sandbox Evasion

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exestеamwеbhеlper.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Wine	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Key opened	\REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Wine	stеamwеbhеlper.exe
Key opened	\REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Wine	stеamwеbhеlper.exe

Loads dropped DLL 6 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exeWerFault.exe

pid process

836 90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
2176 WerFault.exe
2176 WerFault.exe
2176 WerFault.exe
2176 WerFault.exe
2176 WerFault.exe

pid	process
836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
2176	WerFault.exe
2176	WerFault.exe
2176	WerFault.exe
2176	WerFault.exe
2176	WerFault.exe

Checks whether UAC is enabled 1 TTPs 3 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

stеamwеbhеlper.exestеamwеbhеlper.exe90caf8c398e30a5307279c841435a470_JaffaCakes118.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	stеamwеbhеlper.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	stеamwеbhеlper.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

2 ip-api.com

flow	ioc
2	ip-api.com

Writes to the Master Boot Record (MBR) 1 TTPs 3 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exestеamwеbhеlper.exe

description	ioc	process
File opened for modification	\??\PhysicalDrive0	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
File opened for modification	\??\PhysicalDrive0	stеamwеbhеlper.exe
File opened for modification	\??\PhysicalDrive0	stеamwеbhеlper.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 3 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exestеamwеbhеlper.exe

pid process

836 90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
2672 stеamwеbhеlper.exe
1048 stеamwеbhеlper.exe

pid	process
836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
2672	stеamwеbhеlper.exe
1048	stеamwеbhеlper.exe

Drops file in Program Files directory 4 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exe

description	ioc	process
File created	C:\Program Files (x86)\Steam\st?amw?bh?lper.exe	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
File created	C:\Program Files (x86)\Steam\stеamwеbhеlper.exe	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
File opened for modification	C:\Program Files (x86)\Steam\stеamwеbhеlper.exe	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
File opened for modification	C:\Program Files (x86)\Steam\stеamwеbhеlper.exe	stеamwеbhеlper.exe

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

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2176 2672 WerFault.exe stеamwеbhеlper.exe
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

2644 schtasks.exe
2500 schtasks.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

2028 PING.EXE
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exestеamwеbhеlper.exe

pid process

836 90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
2672 stеamwеbhеlper.exe
1048 stеamwеbhеlper.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exe

description pid process

Token: SeDebugPrivilege 836 90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Token: SeDebugPrivilege 2672 stеamwеbhеlper.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

stеamwеbhеlper.exe

pid process

2672 stеamwеbhеlper.exe

pid	pid_target	process	target process
2176	2672	WerFault.exe	stеamwеbhеlper.exe

pid	process
2644	schtasks.exe
2500	schtasks.exe

pid	process
2028	PING.EXE

pid	process
836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
2672	stеamwеbhеlper.exe
1048	stеamwеbhеlper.exe

description	pid	process
Token: SeDebugPrivilege	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Token: SeDebugPrivilege	2672	stеamwеbhеlper.exe

pid	process
2672	stеamwеbhеlper.exe

Suspicious use of WriteProcessMemory 32 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.execmd.exe

description	pid	process	target process
PID 836 wrote to memory of 2644	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	schtasks.exe
PID 836 wrote to memory of 2644	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	schtasks.exe
PID 836 wrote to memory of 2644	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	schtasks.exe
PID 836 wrote to memory of 2644	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	schtasks.exe
PID 836 wrote to memory of 2672	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	stеamwеbhеlper.exe
PID 836 wrote to memory of 2672	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	stеamwеbhеlper.exe
PID 836 wrote to memory of 2672	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	stеamwеbhеlper.exe
PID 836 wrote to memory of 2672	836	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	stеamwеbhеlper.exe
PID 2672 wrote to memory of 2500	2672	stеamwеbhеlper.exe	schtasks.exe
PID 2672 wrote to memory of 2500	2672	stеamwеbhеlper.exe	schtasks.exe
PID 2672 wrote to memory of 2500	2672	stеamwеbhеlper.exe	schtasks.exe
PID 2672 wrote to memory of 2500	2672	stеamwеbhеlper.exe	schtasks.exe
PID 2672 wrote to memory of 2612	2672	stеamwеbhеlper.exe	cmd.exe
PID 2672 wrote to memory of 2612	2672	stеamwеbhеlper.exe	cmd.exe
PID 2672 wrote to memory of 2612	2672	stеamwеbhеlper.exe	cmd.exe
PID 2672 wrote to memory of 2612	2672	stеamwеbhеlper.exe	cmd.exe
PID 2672 wrote to memory of 2176	2672	stеamwеbhеlper.exe	WerFault.exe
PID 2672 wrote to memory of 2176	2672	stеamwеbhеlper.exe	WerFault.exe
PID 2672 wrote to memory of 2176	2672	stеamwеbhеlper.exe	WerFault.exe
PID 2672 wrote to memory of 2176	2672	stеamwеbhеlper.exe	WerFault.exe
PID 2612 wrote to memory of 1820	2612	cmd.exe	chcp.com
PID 2612 wrote to memory of 1820	2612	cmd.exe	chcp.com
PID 2612 wrote to memory of 1820	2612	cmd.exe	chcp.com
PID 2612 wrote to memory of 1820	2612	cmd.exe	chcp.com
PID 2612 wrote to memory of 2028	2612	cmd.exe	PING.EXE
PID 2612 wrote to memory of 2028	2612	cmd.exe	PING.EXE
PID 2612 wrote to memory of 2028	2612	cmd.exe	PING.EXE
PID 2612 wrote to memory of 2028	2612	cmd.exe	PING.EXE
PID 2612 wrote to memory of 1048	2612	cmd.exe	stеamwеbhеlper.exe
PID 2612 wrote to memory of 1048	2612	cmd.exe	stеamwеbhеlper.exe
PID 2612 wrote to memory of 1048	2612	cmd.exe	stеamwеbhеlper.exe
PID 2612 wrote to memory of 1048	2612	cmd.exe	stеamwеbhеlper.exe

C:\Users\Admin\AppData\Local\Temp\90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\90caf8c398e30a5307279c841435a470_JaffaCakes118.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Loads dropped DLL
- Checks whether UAC is enabled
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:836

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Steam Client WebHelper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\90caf8c398e30a5307279c841435a470_JaffaCakes118.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:2644

C:\Program Files (x86)\Steam\stеamwеbhеlper.exe
"C:\Program Files (x86)\Steam\stеamwеbhеlper.exe"
2⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Executes dropped EXE
- Identifies Wine through registry keys
- Checks whether UAC is enabled
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2672

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Steam Client WebHelper" /sc ONLOGON /tr "C:\Program Files (x86)\Steam\stеamwеbhеlper.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2500

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\Z69XodJqzzPr.bat" "
3⤵
- Suspicious use of WriteProcessMemory
PID:2612

C:\Windows\SysWOW64\chcp.com
chcp 65001
4⤵
PID:1820

C:\Windows\SysWOW64\PING.EXE
ping -n 10 localhost
4⤵
- Runs ping.exe
PID:2028

C:\Program Files (x86)\Steam\stеamwеbhеlper.exe
"C:\Program Files (x86)\Steam\stеamwеbhеlper.exe"
4⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Executes dropped EXE
- Identifies Wine through registry keys
- Checks whether UAC is enabled
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
PID:1048

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2672 -s 1640
3⤵
- Loads dropped DLL
- Program crash
PID:2176

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Pre-OS Boot

T1542

Bootkit

Scheduled Task/Job

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Virtualization/Sandbox Evasion

2

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

Query Registry

3

Virtualization/Sandbox Evasion

2

System Information Discovery

3

T1082

Remote System Discovery