Analysis
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max time kernel
92s -
max time network
142s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
07-04-2024 17:44
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20231129-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
293e5793dea329af168463e35950c84a
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SHA1
790fb958938ab09415b8c61deb0d164a24dad596
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SHA256
eddbc56dadb4921c99e30d4637b61238b6b2188b5db86f47bc720cbbb5b15bc7
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SHA512
0b5cd07cb0f8aa1a74a864c737d4447c0bd370cbbfe07d3014c2ec7a355bae5df84674238d105396a30dc37c0c0606870d0dc4f69f1068c849ceb72cae0c39a7
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SSDEEP
49152:rvbI22SsaNYfdPBldt698dBcjHZNp+oGdDkTHHB72eh2NT:rvk22SsaNYfdPBldt6+dBcjHZNU
Malware Config
Extracted
quasar
1.4.1
Office04
2.tcp.eu.ngrok.io:16096
755f883f-4d58-4349-bc9e-f21c4e163b6f
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encryption_key
EE65D8F2E429F4900E3A17963595716D863A2455
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/3388-0-0x0000000000CA0000-0x0000000000FC4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 1916 Client.exe -
Legitimate hosting services abused for malware hosting/C2 1 TTPs 1 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 3924 schtasks.exe 2176 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 3388 Client-built.exe Token: SeDebugPrivilege 1916 Client.exe -
Suspicious use of FindShellTrayWindow 3 IoCs
Processes:
Client.exepid process 1916 Client.exe 1916 Client.exe 1916 Client.exe -
Suspicious use of SendNotifyMessage 3 IoCs
Processes:
Client.exepid process 1916 Client.exe 1916 Client.exe 1916 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 1916 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 3388 wrote to memory of 2176 3388 Client-built.exe schtasks.exe PID 3388 wrote to memory of 2176 3388 Client-built.exe schtasks.exe PID 3388 wrote to memory of 1916 3388 Client-built.exe Client.exe PID 3388 wrote to memory of 1916 3388 Client-built.exe Client.exe PID 1916 wrote to memory of 3924 1916 Client.exe schtasks.exe PID 1916 wrote to memory of 3924 1916 Client.exe schtasks.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.
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3388 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:2176 -
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1916 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:3924
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5293e5793dea329af168463e35950c84a
SHA1790fb958938ab09415b8c61deb0d164a24dad596
SHA256eddbc56dadb4921c99e30d4637b61238b6b2188b5db86f47bc720cbbb5b15bc7
SHA5120b5cd07cb0f8aa1a74a864c737d4447c0bd370cbbfe07d3014c2ec7a355bae5df84674238d105396a30dc37c0c0606870d0dc4f69f1068c849ceb72cae0c39a7