Analysis
- max time kernel
146s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
07/04/2024, 17:38
General
- Target Client-built.exe
- Size 3.1MB
- Sample240407-v71hysad45
- SHA256 e30519495fc30aca7d914b0628fb21dd89f482856a9bbc70c62d2dbcf18d11b7
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
-
install_name
Client.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
- 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
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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)
-
-
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
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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)
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
memory/4168-0-0x0000000000390000-0x00000000006B4000-memory.dmp
memory/4168-1-0x00007FFF27130000-0x00007FFF27BF1000-memory.dmp
memory/4168-2-0x0000000002740000-0x0000000002750000-memory.dmp
memory/4168-9-0x00007FFF27130000-0x00007FFF27BF1000-memory.dmp
memory/4356-8-0x00007FFF27130000-0x00007FFF27BF1000-memory.dmp
memory/4356-10-0x00000000030F0000-0x0000000003100000-memory.dmp
memory/4356-11-0x000000001C920000-0x000000001C970000-memory.dmp
memory/4356-12-0x000000001CA30000-0x000000001CAE2000-memory.dmp
memory/4356-13-0x00007FFF27130000-0x00007FFF27BF1000-memory.dmp
memory/4356-14-0x00000000030F0000-0x0000000003100000-memory.dmp