Analysis
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max time kernel
148s -
max time network
150s -
platform
windows7_x64 -
resource
win7-20240215-en -
resource tags
arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system -
submitted
07-04-2024 17:38
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240215-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
3169d3f34b2ce9d94a1bcb0e9ae48600
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SHA1
ffec6c71b6c2213be5c4745807de1aedd6a90f20
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SHA256
e30519495fc30aca7d914b0628fb21dd89f482856a9bbc70c62d2dbcf18d11b7
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SHA512
468f5db3cdf3a7a2870a6f78956f80b494520c2d8a589895794f4a5d7c7ea9feb262b7f5466933e8995eb2ddd8e92b72d7fe61f9afa4d89681e24840fc729860
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SSDEEP
49152:WvbI22SsaNYfdPBldt698dBcjHp7qx57Gek/DBoGifUaTHHB72eh2NT:Wvk22SsaNYfdPBldt6+dBcjHxqE
Malware Config
Extracted
quasar
1.4.1
Office04
x.tcp.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 3 IoCs
Processes:
resource yara_rule behavioral1/memory/2836-0-0x00000000003E0000-0x0000000000704000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar behavioral1/memory/2940-8-0x00000000012E0000-0x0000000001604000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 2940 Client.exe -
Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 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 2944 schtasks.exe 2536 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 2836 Client-built.exe Token: SeDebugPrivilege 2940 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 2940 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 2940 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 2940 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 2836 wrote to memory of 2944 2836 Client-built.exe schtasks.exe PID 2836 wrote to memory of 2944 2836 Client-built.exe schtasks.exe PID 2836 wrote to memory of 2944 2836 Client-built.exe schtasks.exe PID 2836 wrote to memory of 2940 2836 Client-built.exe Client.exe PID 2836 wrote to memory of 2940 2836 Client-built.exe Client.exe PID 2836 wrote to memory of 2940 2836 Client-built.exe Client.exe PID 2940 wrote to memory of 2536 2940 Client.exe schtasks.exe PID 2940 wrote to memory of 2536 2940 Client.exe schtasks.exe PID 2940 wrote to memory of 2536 2940 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:2836 -
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:2944 -
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:2940 -
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:2536
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD53169d3f34b2ce9d94a1bcb0e9ae48600
SHA1ffec6c71b6c2213be5c4745807de1aedd6a90f20
SHA256e30519495fc30aca7d914b0628fb21dd89f482856a9bbc70c62d2dbcf18d11b7
SHA512468f5db3cdf3a7a2870a6f78956f80b494520c2d8a589895794f4a5d7c7ea9feb262b7f5466933e8995eb2ddd8e92b72d7fe61f9afa4d89681e24840fc729860