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

Processes:

stеamwеbhеlper.exe90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exe

description	ioc	process
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	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

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

System Information Discovery

Processes:

stеamwеbhеlper.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	stеamwеbhеlper.exe

Executes dropped EXE 2 IoCs

Processes:

stеamwеbhеlper.exestеamwеbhеlper.exe

pid process

3556 stеamwеbhеlper.exe
2344 stеamwеbhеlper.exe

pid	process
3556	stеamwеbhеlper.exe
2344	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:

stеamwеbhеlper.exe90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Software\Wine	stеamwеbhеlper.exe
Key opened	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Software\Wine	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Key opened	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Software\Wine	stеamwеbhеlper.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Steam Client WebHelper = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\90caf8c398e30a5307279c841435a470_JaffaCakes118.exe\""	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe

Checks whether UAC is enabled 1 TTPs 3 IoCs

evasion trojan

System Information Discovery

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exestеamwеbhеlper.exe

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

26 ip-api.com

flow	ioc
26	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

1800 90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
3556 stеamwеbhеlper.exe
2344 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

3852 3556 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

1456 schtasks.exe
3100 schtasks.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

3920 PING.EXE

pid	pid_target	process	target process
3852	3556	WerFault.exe	stеamwеbhеlper.exe

pid	process
1456	schtasks.exe
3100	schtasks.exe

pid	process
3920	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exestеamwеbhеlper.exe

pid	process
1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
3556	stеamwеbhеlper.exe
3556	stеamwеbhеlper.exe
2344	stеamwеbhеlper.exe
2344	stеamwеbhеlper.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.exe

description pid process

Token: SeDebugPrivilege 1800 90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Token: SeDebugPrivilege 3556 stеamwеbhеlper.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

stеamwеbhеlper.exe

pid process

3556 stеamwеbhеlper.exe

description	pid	process
Token: SeDebugPrivilege	1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe
Token: SeDebugPrivilege	3556	stеamwеbhеlper.exe

pid	process
3556	stеamwеbhеlper.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

90caf8c398e30a5307279c841435a470_JaffaCakes118.exestеamwеbhеlper.execmd.exe

description	pid	process	target process
PID 1800 wrote to memory of 1456	1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	schtasks.exe
PID 1800 wrote to memory of 1456	1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	schtasks.exe
PID 1800 wrote to memory of 1456	1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	schtasks.exe
PID 1800 wrote to memory of 3556	1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	stеamwеbhеlper.exe
PID 1800 wrote to memory of 3556	1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	stеamwеbhеlper.exe
PID 1800 wrote to memory of 3556	1800	90caf8c398e30a5307279c841435a470_JaffaCakes118.exe	stеamwеbhеlper.exe
PID 3556 wrote to memory of 3100	3556	stеamwеbhеlper.exe	schtasks.exe
PID 3556 wrote to memory of 3100	3556	stеamwеbhеlper.exe	schtasks.exe
PID 3556 wrote to memory of 3100	3556	stеamwеbhеlper.exe	schtasks.exe
PID 3556 wrote to memory of 4604	3556	stеamwеbhеlper.exe	cmd.exe
PID 3556 wrote to memory of 4604	3556	stеamwеbhеlper.exe	cmd.exe
PID 3556 wrote to memory of 4604	3556	stеamwеbhеlper.exe	cmd.exe
PID 4604 wrote to memory of 2728	4604	cmd.exe	chcp.com
PID 4604 wrote to memory of 2728	4604	cmd.exe	chcp.com
PID 4604 wrote to memory of 2728	4604	cmd.exe	chcp.com
PID 4604 wrote to memory of 3920	4604	cmd.exe	PING.EXE
PID 4604 wrote to memory of 3920	4604	cmd.exe	PING.EXE
PID 4604 wrote to memory of 3920	4604	cmd.exe	PING.EXE
PID 4604 wrote to memory of 2344	4604	cmd.exe	stеamwеbhеlper.exe
PID 4604 wrote to memory of 2344	4604	cmd.exe	stеamwеbhеlper.exe
PID 4604 wrote to memory of 2344	4604	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
- Adds Run key to start application
- 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:1800

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:1456

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
- Checks computer location settings
- 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:3556

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:3100

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\ENZuawrUvpW5.bat" "
3⤵
- Suspicious use of WriteProcessMemory
PID:4604

C:\Windows\SysWOW64\chcp.com
chcp 65001
4⤵
PID:2728

C:\Windows\SysWOW64\PING.EXE
ping -n 10 localhost
4⤵
- Runs ping.exe
PID:3920

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:2344

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3556 -s 2228
3⤵
- Program crash
PID:3852

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1424 --field-trial-handle=1928,i,13242902252791919845,10377620236057253993,262144 --variations-seed-version /prefetch:8
1⤵
PID:524

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 3556 -ip 3556
1⤵
PID:2984

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Pre-OS Boot

T1542

Bootkit

T1542.003

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Virtualization/Sandbox Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

Query Registry

Virtualization/Sandbox Evasion

System Information Discovery