quasar | 62fc499b88eeb0334509ede6bba0f67dcdce5eb7954e5cbd2adfaabc0e2d405e

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	applecleaner.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	applecleaner.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	applecleaner.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	applecleaner (1).exe

Executes dropped EXE 3 IoCs

pid	Process
3104	applecleaner.exe
2272	Client-built.exe
2960	Client.exe

Themida packer 7 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/files/0x000b000000023b60-4.dat	themida
behavioral1/memory/3104-9-0x00007FF664CE0000-0x00007FF665673000-memory.dmp	themida
behavioral1/memory/3104-42-0x00007FF664CE0000-0x00007FF665673000-memory.dmp	themida
behavioral1/memory/3104-41-0x00007FF664CE0000-0x00007FF665673000-memory.dmp	themida
behavioral1/memory/3104-40-0x00007FF664CE0000-0x00007FF665673000-memory.dmp	themida
behavioral1/memory/3104-43-0x00007FF664CE0000-0x00007FF665673000-memory.dmp	themida
behavioral1/memory/3104-77-0x00007FF664CE0000-0x00007FF665673000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	applecleaner.exe

Obfuscated Files or Information: Command Obfuscation 1 TTPs
Adversaries may obfuscate content during command execution to impede detection.
defense_evasion

Command Obfuscation
T1027.010

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
3104	applecleaner.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 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	applecleaner (1).exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.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
2588	cmd.exe

Kills process with taskkill 3 IoCs

evasion

pid	Process
4384	taskkill.exe
5028	taskkill.exe
3600	taskkill.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
516	schtasks.exe
4012	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3864	powershell.exe
3864	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2272	Client-built.exe
Token: SeDebugPrivilege	3864	powershell.exe
Token: SeDebugPrivilege	4384	taskkill.exe
Token: SeDebugPrivilege	2960	Client.exe
Token: SeDebugPrivilege	5028	taskkill.exe
Token: SeDebugPrivilege	3600	taskkill.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2960	Client.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 4640 wrote to memory of 3864	4640	applecleaner (1).exe	84
PID 4640 wrote to memory of 3864	4640	applecleaner (1).exe	84
PID 4640 wrote to memory of 3864	4640	applecleaner (1).exe	84
PID 4640 wrote to memory of 3104	4640	applecleaner (1).exe	86
PID 4640 wrote to memory of 3104	4640	applecleaner (1).exe	86
PID 4640 wrote to memory of 2272	4640	applecleaner (1).exe	88
PID 4640 wrote to memory of 2272	4640	applecleaner (1).exe	88
PID 3104 wrote to memory of 1148	3104	applecleaner.exe	89
PID 3104 wrote to memory of 1148	3104	applecleaner.exe	89
PID 1148 wrote to memory of 4384	1148	cmd.exe	90
PID 1148 wrote to memory of 4384	1148	cmd.exe	90
PID 2272 wrote to memory of 516	2272	Client-built.exe	91
PID 2272 wrote to memory of 516	2272	Client-built.exe	91
PID 2272 wrote to memory of 2960	2272	Client-built.exe	94
PID 2272 wrote to memory of 2960	2272	Client-built.exe	94
PID 3104 wrote to memory of 2588	3104	applecleaner.exe	95
PID 3104 wrote to memory of 2588	3104	applecleaner.exe	95
PID 2588 wrote to memory of 5028	2588	cmd.exe	96
PID 2588 wrote to memory of 5028	2588	cmd.exe	96
PID 3104 wrote to memory of 808	3104	applecleaner.exe	97
PID 3104 wrote to memory of 808	3104	applecleaner.exe	97
PID 808 wrote to memory of 3600	808	cmd.exe	98
PID 808 wrote to memory of 3600	808	cmd.exe	98
PID 2960 wrote to memory of 4012	2960	Client.exe	99
PID 2960 wrote to memory of 4012	2960	Client.exe	99

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

C:\Users\Admin\AppData\Local\Temp\applecleaner (1).exe
"C:\Users\Admin\AppData\Local\Temp\applecleaner (1).exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4640
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGYAbABmACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAGgAaABuACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHQAbgBsACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAHAAdwBoACMAPgA="
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3864
- C:\Users\Admin\AppData\Local\Temp\applecleaner.exe
  "C:\Users\Admin\AppData\Local\Temp\applecleaner.exe"
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:3104
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c taskkill /f /im EpicGamesLauncher.exe >nul 2>&1
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1148
  - - C:\Windows\system32\taskkill.exe
      taskkill /f /im EpicGamesLauncher.exe
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:4384
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c taskkill /f /im FortniteClient-Win64-Shipping.exe >nul 2>&1
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2588
  - - C:\Windows\system32\taskkill.exe
      taskkill /f /im FortniteClient-Win64-Shipping.exe
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:5028
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c taskkill /f /im Battle.net.exe >nul 2>&1
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:808
  - - C:\Windows\system32\taskkill.exe
      taskkill /f /im Battle.net.exe
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:3600
- C:\Users\Admin\AppData\Local\Temp\Client-built.exe
  "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2272
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:516
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2960
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4012

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Obfuscated Files or Information

T1027

Command Obfuscation

T1027.010

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

4

System Information Discovery

4

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Virtualization/Sandbox Evasion