Analysis
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max time kernel
147s -
max time network
154s -
platform
windows10-2004_x64 -
resource
win10v2004-20240412-en -
resource tags
arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system -
submitted
18-04-2024 14:01
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
af13ce84d2a5ee2ab7854af2d6571ab1
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SHA1
bf082b48f3bd45f8e6c55a7e897f5171181fad61
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SHA256
30369ff4ed77a2cf2fd35a32c876a222cca094e7db7344051dc881e982908e95
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SHA512
e501e34e108a99a8a82560b20baccdd3746f5713a0fbaa37a209ff1daacf6637022c5bfd35ff25efdc9adbf7ddf72e7882cf300d076f1ab0886174437e801d56
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SSDEEP
49152:HvnI22SsaNYfdPBldt698dBcjHoRxNESEQk/inLoGdTTHHB72eh2NT:HvI22SsaNYfdPBldt6+dBcjH2xjL
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.254.152:4782
37c3d2aa-6a36-4ee8-a4be-f1c3187fbd03
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encryption_key
E9EE5B51F341491A9CE8837BE89BB18191B86C1E
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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 behavioral1/memory/4436-0-0x0000000000700000-0x0000000000A24000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 4352 Client.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 4436 Client-built.exe Token: SeDebugPrivilege 4352 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 4352 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 4352 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 4352 Client.exe -
Suspicious use of WriteProcessMemory 2 IoCs
Processes:
Client-built.exedescription pid process target process PID 4436 wrote to memory of 4352 4436 Client-built.exe Client.exe PID 4436 wrote to memory of 4352 4436 Client-built.exe Client.exe
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:4436 -
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
PID:4352
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5af13ce84d2a5ee2ab7854af2d6571ab1
SHA1bf082b48f3bd45f8e6c55a7e897f5171181fad61
SHA25630369ff4ed77a2cf2fd35a32c876a222cca094e7db7344051dc881e982908e95
SHA512e501e34e108a99a8a82560b20baccdd3746f5713a0fbaa37a209ff1daacf6637022c5bfd35ff25efdc9adbf7ddf72e7882cf300d076f1ab0886174437e801d56