quasar | c6820f426b28b93295ca3b768780e8b372424fb72e94b5d0c094b030f53d4721

Windows Service

Disable or Modify Tools

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\DisableAntiSpyware = "1"	Microsoft OneDrive.exe

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

defense_evasion trojan

Modify Registry

Windows Service

Disable or Modify Tools

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	Microsoft OneDrive.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	Microsoft OneDrive.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	Microsoft OneDrive.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	Microsoft OneDrive.exe

Modifies Windows Defender TamperProtection settings 3 TTPs 1 IoCs

evasion trojan

Modify Registry

Windows Service

Disable or Modify Tools

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	Microsoft OneDrive.exe

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000a000000027d36-21.dat	family_quasar
behavioral1/memory/3728-36-0x0000000000430000-0x00000000004C0000-memory.dmp	family_quasar

VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat
Venomrat family
venomrat

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3524754987-2550789650-2995585052-1000\Control Panel\International\Geo\Nation	ItroublveTSC.exe

Executes dropped EXE 3 IoCs

pid	Process
5116	ItroublveTSC.exe
3728	Microsoft OneDrive.exe
4364	OneDrive.exe

Windows security modification 2 TTPs 2 IoCs

defense_evasion trojan

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	Microsoft OneDrive.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	Microsoft OneDrive.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.

flow	ioc
13	ip-api.com

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\Microsoft One Drive\OneDrive.exe	Microsoft OneDrive.exe

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1776	4364	WerFault.exe	86

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ItroublveTSC.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ItroublveTSC.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Microsoft OneDrive.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	OneDrive.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
972	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
972	PING.EXE

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
4948	schtasks.exe
3276	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4596	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5116	ItroublveTSC.exe
Token: SeDebugPrivilege	3728	Microsoft OneDrive.exe
Token: SeDebugPrivilege	4596	powershell.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
5116	ItroublveTSC.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
5116	ItroublveTSC.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3796 wrote to memory of 5116	3796	ItroublveTSC.exe	81
PID 3796 wrote to memory of 5116	3796	ItroublveTSC.exe	81
PID 3796 wrote to memory of 5116	3796	ItroublveTSC.exe	81
PID 3796 wrote to memory of 3728	3796	ItroublveTSC.exe	82
PID 3796 wrote to memory of 3728	3796	ItroublveTSC.exe	82
PID 3796 wrote to memory of 3728	3796	ItroublveTSC.exe	82
PID 3728 wrote to memory of 4948	3728	Microsoft OneDrive.exe	84
PID 3728 wrote to memory of 4948	3728	Microsoft OneDrive.exe	84
PID 3728 wrote to memory of 4948	3728	Microsoft OneDrive.exe	84
PID 3728 wrote to memory of 4364	3728	Microsoft OneDrive.exe	86
PID 3728 wrote to memory of 4364	3728	Microsoft OneDrive.exe	86
PID 3728 wrote to memory of 4364	3728	Microsoft OneDrive.exe	86
PID 3728 wrote to memory of 4596	3728	Microsoft OneDrive.exe	87
PID 3728 wrote to memory of 4596	3728	Microsoft OneDrive.exe	87
PID 3728 wrote to memory of 4596	3728	Microsoft OneDrive.exe	87

C:\Users\Admin\AppData\Local\Temp\ItroublveTSC.exe
"C:\Users\Admin\AppData\Local\Temp\ItroublveTSC.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3796
- C:\Users\Admin\AppData\Roaming\ItroublveTSC.exe
  "C:\Users\Admin\AppData\Roaming\ItroublveTSC.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:5116
- C:\Users\Admin\AppData\Local\Temp\Microsoft OneDrive.exe
  "C:\Users\Admin\AppData\Local\Temp\Microsoft OneDrive.exe"
  2⤵
  - Modifies Windows Defender DisableAntiSpyware settings
  - Modifies Windows Defender Real-time Protection settings
  - Modifies Windows Defender TamperProtection settings
  - Executes dropped EXE
  - Windows security modification
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3728
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Microsoft One Drive" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Microsoft OneDrive.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4948
- - C:\Windows\SysWOW64\Microsoft One Drive\OneDrive.exe
    "C:\Windows\SysWOW64\Microsoft One Drive\OneDrive.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4364
  - - C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "Microsoft One Drive" /sc ONLOGON /tr "C:\Windows\SysWOW64\Microsoft One Drive\OneDrive.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3276
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\xNQFPqfVfNKn.bat" "
      4⤵
      PID:5060
    - - C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        5⤵
        
        PID:4960
    - - C:\Windows\SysWOW64\PING.EXE
        
        ping -n 10 localhost
        5⤵
        System Network Configuration Discovery: Internet Connection Discovery
        Runs ping.exe
        
        PID:972
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4364 -s 2228
      4⤵
      Program crash
      PID:1776
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4596

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4364 -ip 4364
1⤵
PID:4296

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Create or Modify System Process

T1543

Windows Service

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Impair Defenses

4

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

2

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery