Analysis
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max time kernel
150s -
max time network
155s -
platform
windows7_x64 -
resource
win7-20240221-en -
resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system -
submitted
07-04-2024 17:39
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240221-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
2aebe66b019df4695fe7218875c93856
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SHA1
646890986ef0bba4eed6b659d56704d09e414562
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SHA256
ea3003e00c6e653fad8844d4677ceef7b7b6e499939ed765a49df3898ddf3c45
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SHA512
7391db69d5cc021dee50b2af12d11b30a4225f46b4469d10eff4e659c71c298233dea01e1e626d35d49b9490ef3dcaa1570b4448859d9d04ac0270b71c84bddc
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SSDEEP
49152:WvbI22SsaNYfdPBldt698dBcjHHyxNESEXk/ijLoGdAwXTHHB72eh2NT:Wvk22SsaNYfdPBldt6+dBcjHSxavD
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/2180-0-0x0000000001340000-0x0000000001664000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar behavioral1/memory/3040-9-0x0000000001010000-0x0000000001334000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 3040 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 2556 schtasks.exe 2824 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 2180 Client-built.exe Token: SeDebugPrivilege 3040 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 3040 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 3040 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 3040 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 2180 wrote to memory of 2556 2180 Client-built.exe schtasks.exe PID 2180 wrote to memory of 2556 2180 Client-built.exe schtasks.exe PID 2180 wrote to memory of 2556 2180 Client-built.exe schtasks.exe PID 2180 wrote to memory of 3040 2180 Client-built.exe Client.exe PID 2180 wrote to memory of 3040 2180 Client-built.exe Client.exe PID 2180 wrote to memory of 3040 2180 Client-built.exe Client.exe PID 3040 wrote to memory of 2824 3040 Client.exe schtasks.exe PID 3040 wrote to memory of 2824 3040 Client.exe schtasks.exe PID 3040 wrote to memory of 2824 3040 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:2180 -
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:2556 -
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:3040 -
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:2824
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD52aebe66b019df4695fe7218875c93856
SHA1646890986ef0bba4eed6b659d56704d09e414562
SHA256ea3003e00c6e653fad8844d4677ceef7b7b6e499939ed765a49df3898ddf3c45
SHA5127391db69d5cc021dee50b2af12d11b30a4225f46b4469d10eff4e659c71c298233dea01e1e626d35d49b9490ef3dcaa1570b4448859d9d04ac0270b71c84bddc