Analysis
- max time kernel
149s - max time network
151s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
07/04/2026, 06:26
General
- Target Client-built.exe
- Size 3.1MB
- Sample260407-g663fsav2l
- SHA256 4896f685f2e6e2f6250fc6622bb59f1854eefa7b5dadf23a0f3352a01b8a05c3
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
bblive.in.net:443
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www.bblive.in.net:443
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bblive.in.net:80
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www.bblive.in.net:80
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36297506-68a8-4705-a8d5-049888e52352
-
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-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.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
-
-
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
memory/1828-14-0x0000000002F70000-0x0000000002F82000-memory.dmp
memory/1828-13-0x0000000002EF0000-0x0000000002EFC000-memory.dmp
memory/3540-9-0x00000000029A0000-0x00000000029B2000-memory.dmp
memory/3540-8-0x00000000027D0000-0x00000000027DC000-memory.dmp
memory/3540-0-0x00000000002D0000-0x00000000005F4000-memory.dmp
memory/3540-1-0x000000001B300000-0x000000001B310000-memory.dmp
memory/4260-10-0x000000001BAE0000-0x000000001BAF0000-memory.dmp
memory/4260-15-0x000000001C6E0000-0x000000001C730000-memory.dmp
memory/4260-16-0x000000001C7F0000-0x000000001C8A2000-memory.dmp
memory/4260-17-0x0000000002E30000-0x0000000002E3C000-memory.dmp
memory/4260-18-0x000000001B9E0000-0x000000001B9F2000-memory.dmp
memory/4260-19-0x000000001BAE0000-0x000000001BAF0000-memory.dmp