Analysis
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max time kernel
146s -
max time network
150s -
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 17:38
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 2 IoCs
Processes:
resource yara_rule behavioral2/memory/4168-0-0x0000000000390000-0x00000000006B4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 4356 Client.exe -
Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs
Processes:
flow ioc 58 x.tcp.ngrok.io 84 x.tcp.ngrok.io 91 x.tcp.ngrok.io 13 x.tcp.ngrok.io -
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 3576 schtasks.exe 3956 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 4168 Client-built.exe Token: SeDebugPrivilege 4356 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 4356 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 4356 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 4356 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 4168 wrote to memory of 3576 4168 Client-built.exe schtasks.exe PID 4168 wrote to memory of 3576 4168 Client-built.exe schtasks.exe PID 4168 wrote to memory of 4356 4168 Client-built.exe Client.exe PID 4168 wrote to memory of 4356 4168 Client-built.exe Client.exe PID 4356 wrote to memory of 3956 4356 Client.exe schtasks.exe PID 4356 wrote to memory of 3956 4356 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:4168 -
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:3576 -
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:4356 -
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:3956
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD53169d3f34b2ce9d94a1bcb0e9ae48600
SHA1ffec6c71b6c2213be5c4745807de1aedd6a90f20
SHA256e30519495fc30aca7d914b0628fb21dd89f482856a9bbc70c62d2dbcf18d11b7
SHA512468f5db3cdf3a7a2870a6f78956f80b494520c2d8a589895794f4a5d7c7ea9feb262b7f5466933e8995eb2ddd8e92b72d7fe61f9afa4d89681e24840fc729860