quasar | 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6

Processes:

svchost.exe

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

Looks for VirtualBox Guest Additions in registry 2 TTPs 2 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

Processes:

krummy-lavacrypt-gfhd.exesvchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	krummy-lavacrypt-gfhd.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	svchost.exe

Looks for VMWare Tools registry key 2 TTPs 2 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

Processes:

krummy-lavacrypt-gfhd.exesvchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	krummy-lavacrypt-gfhd.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	svchost.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

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

Query Registry

System Information Discovery

Processes:

svchost.exekrummy-lavacrypt-gfhd.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	krummy-lavacrypt-gfhd.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	krummy-lavacrypt-gfhd.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	svchost.exe

Checks computer location settings 2 TTPs 2 IoCs

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

Query Registry

System Information Discovery

Processes:

krummy-lavacrypt-gfhd.exesvchost.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2288054676-1871194608-3559553667-1000\Control Panel\International\Geo\Nation	krummy-lavacrypt-gfhd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2288054676-1871194608-3559553667-1000\Control Panel\International\Geo\Nation	svchost.exe

Executes dropped EXE 2 IoCs

Processes:

svchost.exeClient.exe

pid process

4900 svchost.exe
1092 Client.exe

pid	process
4900	svchost.exe
1092	Client.exe

Windows security modification 2 TTPs 3 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

svchost.exe

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

krummy-lavacrypt-gfhd.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2288054676-1871194608-3559553667-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\""	krummy-lavacrypt-gfhd.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

Processes:

svchost.exe

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

Maps connected drives based on registry 3 TTPs 4 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

Processes:

krummy-lavacrypt-gfhd.exesvchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	krummy-lavacrypt-gfhd.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	krummy-lavacrypt-gfhd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	svchost.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

svchost.exe

description pid process target process

PID 4900 set thread context of 920 4900 svchost.exe msbuild.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
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/Job
T1053

Processes:

schtasks.exe

pid process

1920 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4104 timeout.exe

description	pid	process	target process
PID 4900 set thread context of 920	4900	svchost.exe	msbuild.exe

pid	process
1920	schtasks.exe

pid	process
4104	timeout.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

Processes:

krummy-lavacrypt-gfhd.exepowershell.exe

pid	process
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
220	krummy-lavacrypt-gfhd.exe
1104	powershell.exe
1104	powershell.exe
1104	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

krummy-lavacrypt-gfhd.exesvchost.exepowershell.exemsbuild.exe

description	pid	process
Token: SeDebugPrivilege	220	krummy-lavacrypt-gfhd.exe
Token: SeDebugPrivilege	4900	svchost.exe
Token: SeDebugPrivilege	1104	powershell.exe
Token: SeDebugPrivilege	920	msbuild.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

krummy-lavacrypt-gfhd.execmd.execmd.exesvchost.exemsbuild.exe

description	pid	process	target process
PID 220 wrote to memory of 4532	220	krummy-lavacrypt-gfhd.exe	cmd.exe
PID 220 wrote to memory of 4532	220	krummy-lavacrypt-gfhd.exe	cmd.exe
PID 220 wrote to memory of 1208	220	krummy-lavacrypt-gfhd.exe	cmd.exe
PID 220 wrote to memory of 1208	220	krummy-lavacrypt-gfhd.exe	cmd.exe
PID 1208 wrote to memory of 4104	1208	cmd.exe	timeout.exe
PID 1208 wrote to memory of 4104	1208	cmd.exe	timeout.exe
PID 4532 wrote to memory of 1920	4532	cmd.exe	schtasks.exe
PID 4532 wrote to memory of 1920	4532	cmd.exe	schtasks.exe
PID 1208 wrote to memory of 4900	1208	cmd.exe	svchost.exe
PID 1208 wrote to memory of 4900	1208	cmd.exe	svchost.exe
PID 4900 wrote to memory of 1104	4900	svchost.exe	powershell.exe
PID 4900 wrote to memory of 1104	4900	svchost.exe	powershell.exe
PID 4900 wrote to memory of 920	4900	svchost.exe	msbuild.exe
PID 4900 wrote to memory of 920	4900	svchost.exe	msbuild.exe
PID 4900 wrote to memory of 920	4900	svchost.exe	msbuild.exe
PID 4900 wrote to memory of 920	4900	svchost.exe	msbuild.exe
PID 4900 wrote to memory of 920	4900	svchost.exe	msbuild.exe
PID 4900 wrote to memory of 920	4900	svchost.exe	msbuild.exe
PID 4900 wrote to memory of 920	4900	svchost.exe	msbuild.exe
PID 4900 wrote to memory of 920	4900	svchost.exe	msbuild.exe
PID 920 wrote to memory of 1092	920	msbuild.exe	Client.exe
PID 920 wrote to memory of 1092	920	msbuild.exe	Client.exe
PID 920 wrote to memory of 1092	920	msbuild.exe	Client.exe

System policy modification 1 TTPs 1 IoCs
evasion

Modify Registry
T1112

Processes:

svchost.exe

description ioc process

Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" svchost.exe
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

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

C:\Users\Admin\AppData\Local\Temp\krummy-lavacrypt-gfhd.exe
"C:\Users\Admin\AppData\Local\Temp\krummy-lavacrypt-gfhd.exe"
1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:220

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
2⤵
- Suspicious use of WriteProcessMemory
PID:4532

C:\Windows\system32\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
3⤵
- Creates scheduled task(s)
PID:1920

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp594B.tmp.bat""
2⤵
- Suspicious use of WriteProcessMemory
PID:1208

C:\Windows\system32\timeout.exe
timeout 3
3⤵
- Delays execution with timeout.exe
PID:4104

C:\Users\Admin\AppData\Roaming\svchost.exe
"C:\Users\Admin\AppData\Roaming\svchost.exe"
3⤵
- UAC bypass
- Windows security bypass
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Executes dropped EXE
- Windows security modification
- Checks whether UAC is enabled
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4900

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\svchost.exe" -Force
4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1104

C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"
4⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:920

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
5⤵
- Executes dropped EXE
PID:1092

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

Scheduled Task/Job

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

3

T1562

Disable or Modify Tools

3

T1562.001

Modify Registry

5

Virtualization/Sandbox Evasion

2

Credential Access

Discovery

Query Registry

6

Virtualization/Sandbox Evasion

2

System Information Discovery

5

Peripheral Device Discovery