Analysis
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max time kernel
149s -
max time network
147s -
platform
windows7_x64 -
resource
win7-20231129-en -
resource tags
arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-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 3 IoCs
Processes:
resource yara_rule behavioral1/memory/1724-0-0x0000000000AF0000-0x0000000000E14000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar behavioral1/memory/1056-7-0x00000000011A0000-0x00000000014C4000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 1056 Client.exe -
Legitimate hosting services abused for malware hosting/C2 1 TTPs 5 IoCs
Processes:
flow ioc 2 2.tcp.eu.ngrok.io 19 2.tcp.eu.ngrok.io 21 2.tcp.eu.ngrok.io 39 2.tcp.eu.ngrok.io 44 2.tcp.eu.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 2396 schtasks.exe 2584 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 1724 Client-built.exe Token: SeDebugPrivilege 1056 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 1056 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 1056 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 1056 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 1724 wrote to memory of 2396 1724 Client-built.exe schtasks.exe PID 1724 wrote to memory of 2396 1724 Client-built.exe schtasks.exe PID 1724 wrote to memory of 2396 1724 Client-built.exe schtasks.exe PID 1724 wrote to memory of 1056 1724 Client-built.exe Client.exe PID 1724 wrote to memory of 1056 1724 Client-built.exe Client.exe PID 1724 wrote to memory of 1056 1724 Client-built.exe Client.exe PID 1056 wrote to memory of 2584 1056 Client.exe schtasks.exe PID 1056 wrote to memory of 2584 1056 Client.exe schtasks.exe PID 1056 wrote to memory of 2584 1056 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:1724 -
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:2396 -
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:1056 -
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:2584
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5293e5793dea329af168463e35950c84a
SHA1790fb958938ab09415b8c61deb0d164a24dad596
SHA256eddbc56dadb4921c99e30d4637b61238b6b2188b5db86f47bc720cbbb5b15bc7
SHA5120b5cd07cb0f8aa1a74a864c737d4447c0bd370cbbfe07d3014c2ec7a355bae5df84674238d105396a30dc37c0c0606870d0dc4f69f1068c849ceb72cae0c39a7