Analysis
- max time kernel
149s - max time network
152s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
09/04/2026, 12:13
General
- Target Client.exe
- Size 3.1MB
- Sample260409-pdpxgagw2w
- SHA256 0eea8615520be4dd737d6e4727c64630e74da0f74b8e555bed26490bf588aa65
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
cyy.uk.com:443
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www.cyy.uk.com:443
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cyy.uk.com:80
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www.cyy.uk.com:80
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90c2f69f-c2cc-4cfa-9dc0-da19386f352f
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encryption_key
ED3227F773701D05083B11A65776F95F93EEEF5E
-
install_name
Client.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar family
- Quasar payload 2 IoCs
- Executes dropped EXE 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 3 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
-
C:\Users\Admin\AppData\Local\Temp\Client.exe"C:\Users\Admin\AppData\Local\Temp\Client.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
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⤵
- Scheduled Task/Job: Scheduled Task
-
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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
-
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⤵
- Scheduled Task/Job: Scheduled Task
-
-
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeC:\Users\Admin\AppData\Roaming\SubDir\Client.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Client.exe.log
Client.exe
memory/2148-11-0x000000001BA90000-0x000000001BAA0000-memory.dmp
memory/2148-15-0x000000001C5A0000-0x000000001C5F0000-memory.dmp
memory/2148-16-0x000000001C6B0000-0x000000001C762000-memory.dmp
memory/2148-17-0x0000000001530000-0x000000000153C000-memory.dmp
memory/2148-18-0x000000001B890000-0x000000001B8A2000-memory.dmp
memory/2148-19-0x000000001BA90000-0x000000001BAA0000-memory.dmp
memory/2204-14-0x000000001B8F0000-0x000000001B902000-memory.dmp
memory/2204-13-0x0000000002C40000-0x0000000002C4C000-memory.dmp
memory/5004-1-0x000000001BEC0000-0x000000001BED0000-memory.dmp
memory/5004-10-0x00000000033F0000-0x0000000003402000-memory.dmp
memory/5004-9-0x0000000003270000-0x000000000327C000-memory.dmp
memory/5004-0-0x0000000000E70000-0x0000000001194000-memory.dmp