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

Detects Windows executables referencing non-Windows User-Agents 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1540-27-0x0000000000400000-0x0000000000724000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1540-27-0x0000000000400000-0x0000000000724000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1540-27-0x0000000000400000-0x0000000000724000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Detects executables packed with or use KoiVM 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4472-3-0x000001E7B01D0000-0x000001E7B0548000-memory.dmp	INDICATOR_EXE_Packed_KoiVM

Looks for VirtualBox Guest Additions in registry 2 TTPs 2 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

Processes:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.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:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.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:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.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:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-259785868-298165991-4178590326-1000\Control Panel\International\Geo\Nation	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
Key value queried	\REGISTRY\USER\S-1-5-21-259785868-298165991-4178590326-1000\Control Panel\International\Geo\Nation	svchost.exe

Executes dropped EXE 2 IoCs

Processes:

svchost.exeClient.exe

pid process

3632 svchost.exe
5044 Client.exe

pid	process
3632	svchost.exe
5044	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
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	svchost.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	svchost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\svchost.exe = "0"	svchost.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-259785868-298165991-4178590326-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\""	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.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:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.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 3632 set thread context of 1540 3632 svchost.exe installutil.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

4772 schtasks.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

3456 timeout.exe

description	pid	process	target process
PID 3632 set thread context of 1540	3632	svchost.exe	installutil.exe

pid	process
4772	schtasks.exe

pid	process
3456	timeout.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

Processes:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exepowershell.exe

pid	process
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
3372	powershell.exe
3372	powershell.exe
3372	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exesvchost.exepowershell.exeinstallutil.exe

description	pid	process
Token: SeDebugPrivilege	4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
Token: SeDebugPrivilege	3632	svchost.exe
Token: SeDebugPrivilege	3372	powershell.exe
Token: SeDebugPrivilege	1540	installutil.exe

Suspicious use of WriteProcessMemory 26 IoCs

Processes:

28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.execmd.execmd.exesvchost.exeinstallutil.exe

description	pid	process	target process
PID 4472 wrote to memory of 3764	4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe	cmd.exe
PID 4472 wrote to memory of 3764	4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe	cmd.exe
PID 4472 wrote to memory of 4092	4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe	cmd.exe
PID 4472 wrote to memory of 4092	4472	28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe	cmd.exe
PID 4092 wrote to memory of 3456	4092	cmd.exe	timeout.exe
PID 4092 wrote to memory of 3456	4092	cmd.exe	timeout.exe
PID 3764 wrote to memory of 4772	3764	cmd.exe	schtasks.exe
PID 3764 wrote to memory of 4772	3764	cmd.exe	schtasks.exe
PID 4092 wrote to memory of 3632	4092	cmd.exe	svchost.exe
PID 4092 wrote to memory of 3632	4092	cmd.exe	svchost.exe
PID 3632 wrote to memory of 3372	3632	svchost.exe	powershell.exe
PID 3632 wrote to memory of 3372	3632	svchost.exe	powershell.exe
PID 3632 wrote to memory of 1104	3632	svchost.exe	msbuild.exe
PID 3632 wrote to memory of 1104	3632	svchost.exe	msbuild.exe
PID 3632 wrote to memory of 1104	3632	svchost.exe	msbuild.exe
PID 3632 wrote to memory of 1540	3632	svchost.exe	installutil.exe
PID 3632 wrote to memory of 1540	3632	svchost.exe	installutil.exe
PID 3632 wrote to memory of 1540	3632	svchost.exe	installutil.exe
PID 3632 wrote to memory of 1540	3632	svchost.exe	installutil.exe
PID 3632 wrote to memory of 1540	3632	svchost.exe	installutil.exe
PID 3632 wrote to memory of 1540	3632	svchost.exe	installutil.exe
PID 3632 wrote to memory of 1540	3632	svchost.exe	installutil.exe
PID 3632 wrote to memory of 1540	3632	svchost.exe	installutil.exe
PID 1540 wrote to memory of 5044	1540	installutil.exe	Client.exe
PID 1540 wrote to memory of 5044	1540	installutil.exe	Client.exe
PID 1540 wrote to memory of 5044	1540	installutil.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\28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.exe
"C:\Users\Admin\AppData\Local\Temp\28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6.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:4472

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:3764

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:4772

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCCE5.tmp.bat""
2⤵
- Suspicious use of WriteProcessMemory
PID:4092

C:\Windows\system32\timeout.exe
timeout 3
3⤵
- Delays execution with timeout.exe
PID:3456

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:3632

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:3372

C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"
4⤵
PID:1104

C:\Windows\Microsoft.NET\Framework\v4.0.30319\installutil.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\installutil.exe"
4⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1540

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
5⤵
- Executes dropped EXE
PID:5044

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

Scheduled Task/Job

T1053

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

Virtualization/Sandbox Evasion

Credential Access

Discovery

Query Registry

Virtualization/Sandbox Evasion

System Information Discovery