Analysis
- max time kernel
149s - max time network
150s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
24/04/2026, 06:44
General
- Target Client.exe
- Size 3.1MB
- Sample260424-hh1ffaby5j
- SHA256 c90773496f37419a0c5762e0038508a257fc05dbcfb3d3f6979df56c32372c75
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
ku3933net.ink:443
-
www.ku3933net.ink:443
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ku3933net.ink:80
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www.ku3933net.ink:80
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102a2c31-6b52-436b-99f0-50cf5b81fbfe
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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
- Family: Quasar RAT
Quasar is an open source Remote Access Tool.
- 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
-
-
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/1388-17-0x000000001BC60000-0x000000001BCB0000-memory.dmp
memory/1388-20-0x0000000000D00000-0x0000000000D0C000-memory.dmp
memory/1388-22-0x000000001B0B0000-0x000000001B0C0000-memory.dmp
memory/1388-21-0x000000001AF50000-0x000000001AF62000-memory.dmp
memory/1388-19-0x0000000000B50000-0x0000000000B81000-memory.dmp
memory/1388-12-0x000000001B0B0000-0x000000001B0C0000-memory.dmp
memory/1388-18-0x000000001BD70000-0x000000001BE22000-memory.dmp
memory/4424-11-0x000000001BFC0000-0x000000001BFD2000-memory.dmp
memory/4424-9-0x00000000013A0000-0x00000000013D1000-memory.dmp
memory/4424-10-0x0000000002D00000-0x0000000002D0C000-memory.dmp
memory/4424-0-0x00000000008C0000-0x0000000000BE4000-memory.dmp
memory/4424-1-0x000000001B860000-0x000000001B870000-memory.dmp
memory/5080-14-0x0000000001190000-0x00000000011C1000-memory.dmp
memory/5080-15-0x0000000001240000-0x000000000124C000-memory.dmp
memory/5080-16-0x0000000002AC0000-0x0000000002AD2000-memory.dmp