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-1-5-21-3226857575-536881564-1522996248-1000\Control Panel\International\Geo\Nation	applecleaner (1).exe

Executes dropped EXE 3 IoCs

pid	Process
3348	applecleaner.exe
4612	Client-built.exe
2076	Client.exe

Themida packer 7 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/files/0x0006000000045509-4.dat	themida
behavioral2/memory/3348-24-0x00007FF61C070000-0x00007FF61CA03000-memory.dmp	themida
behavioral2/memory/3348-31-0x00007FF61C070000-0x00007FF61CA03000-memory.dmp	themida
behavioral2/memory/3348-32-0x00007FF61C070000-0x00007FF61CA03000-memory.dmp	themida
behavioral2/memory/3348-33-0x00007FF61C070000-0x00007FF61CA03000-memory.dmp	themida
behavioral2/memory/3348-34-0x00007FF61C070000-0x00007FF61CA03000-memory.dmp	themida
behavioral2/memory/3348-74-0x00007FF61C070000-0x00007FF61CA03000-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
3348	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
1424	cmd.exe

Kills process with taskkill 3 IoCs

evasion

pid	Process
1888	taskkill.exe
1036	taskkill.exe
4600	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
3244	schtasks.exe
2044	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1732	powershell.exe
1732	powershell.exe

Suspicious use of AdjustPrivilegeToken 27 IoCs

description	pid	Process
Token: SeDebugPrivilege	4612	Client-built.exe
Token: SeDebugPrivilege	1732	powershell.exe
Token: SeDebugPrivilege	1888	taskkill.exe
Token: SeDebugPrivilege	2076	Client.exe
Token: SeDebugPrivilege	1036	taskkill.exe
Token: SeDebugPrivilege	4600	taskkill.exe
Token: SeIncreaseQuotaPrivilege	1732	powershell.exe
Token: SeSecurityPrivilege	1732	powershell.exe
Token: SeTakeOwnershipPrivilege	1732	powershell.exe
Token: SeLoadDriverPrivilege	1732	powershell.exe
Token: SeSystemProfilePrivilege	1732	powershell.exe
Token: SeSystemtimePrivilege	1732	powershell.exe
Token: SeProfSingleProcessPrivilege	1732	powershell.exe
Token: SeIncBasePriorityPrivilege	1732	powershell.exe
Token: SeCreatePagefilePrivilege	1732	powershell.exe
Token: SeBackupPrivilege	1732	powershell.exe
Token: SeRestorePrivilege	1732	powershell.exe
Token: SeShutdownPrivilege	1732	powershell.exe
Token: SeDebugPrivilege	1732	powershell.exe
Token: SeSystemEnvironmentPrivilege	1732	powershell.exe
Token: SeRemoteShutdownPrivilege	1732	powershell.exe
Token: SeUndockPrivilege	1732	powershell.exe
Token: SeManageVolumePrivilege	1732	powershell.exe
Token: 33	1732	powershell.exe
Token: 34	1732	powershell.exe
Token: 35	1732	powershell.exe
Token: 36	1732	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2076	Client.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 4368 wrote to memory of 1732	4368	applecleaner (1).exe	81
PID 4368 wrote to memory of 1732	4368	applecleaner (1).exe	81
PID 4368 wrote to memory of 1732	4368	applecleaner (1).exe	81
PID 4368 wrote to memory of 3348	4368	applecleaner (1).exe	83
PID 4368 wrote to memory of 3348	4368	applecleaner (1).exe	83
PID 4368 wrote to memory of 4612	4368	applecleaner (1).exe	85
PID 4368 wrote to memory of 4612	4368	applecleaner (1).exe	85
PID 3348 wrote to memory of 3520	3348	applecleaner.exe	86
PID 3348 wrote to memory of 3520	3348	applecleaner.exe	86
PID 4612 wrote to memory of 3244	4612	Client-built.exe	87
PID 4612 wrote to memory of 3244	4612	Client-built.exe	87
PID 3520 wrote to memory of 1888	3520	cmd.exe	89
PID 3520 wrote to memory of 1888	3520	cmd.exe	89
PID 4612 wrote to memory of 2076	4612	Client-built.exe	90
PID 4612 wrote to memory of 2076	4612	Client-built.exe	90
PID 2076 wrote to memory of 2044	2076	Client.exe	92
PID 2076 wrote to memory of 2044	2076	Client.exe	92
PID 3348 wrote to memory of 1424	3348	applecleaner.exe	94
PID 3348 wrote to memory of 1424	3348	applecleaner.exe	94
PID 1424 wrote to memory of 1036	1424	cmd.exe	95
PID 1424 wrote to memory of 1036	1424	cmd.exe	95
PID 3348 wrote to memory of 2332	3348	applecleaner.exe	96
PID 3348 wrote to memory of 2332	3348	applecleaner.exe	96
PID 2332 wrote to memory of 4600	2332	cmd.exe	97
PID 2332 wrote to memory of 4600	2332	cmd.exe	97

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:4368
- 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:1732
- 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:3348
- - 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:3520
  - - C:\Windows\system32\taskkill.exe
      taskkill /f /im EpicGamesLauncher.exe
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1888
- - 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:1424
  - - C:\Windows\system32\taskkill.exe
      taskkill /f /im FortniteClient-Win64-Shipping.exe
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1036
- - 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:2332
  - - C:\Windows\system32\taskkill.exe
      taskkill /f /im Battle.net.exe
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:4600
- 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:4612
- - 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:3244
- - 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:2076
  - - 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:2044

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