Analysis
- max time kernel
149s - max time network
153s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
08/04/2026, 17:13
General
- Target Client-built.exe
- Size 3.1MB
- Sample260408-vrt18sgz5k
- SHA256 71ba235e10e2ac8f4f661b5f0798dd5c838e20945b2ad96636875ccda3cd0a5e
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
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xn--eck4dzdq88wogxb.jpn.com:443
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www.xn--eck4dzdq88wogxb.jpn.com:443
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xn--eck4dzdq88wogxb.jpn.com:80
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www.xn--eck4dzdq88wogxb.jpn.com:80
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95d7ffa3-8ca5-4b69-803f-37528a908e60
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encryption_key
ED3227F773701D05083B11A65776F95F93EEEF5E
-
install_name
Client.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
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 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
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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⤵
- 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
-
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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
- 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 /f2⤵
- Scheduled Task/Job: Scheduled Task
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Client.exe
memory/3584-11-0x0000000003080000-0x0000000003090000-memory.dmp
memory/3584-14-0x00000000030C0000-0x00000000030D2000-memory.dmp
memory/3584-13-0x0000000003040000-0x000000000304C000-memory.dmp
memory/4136-15-0x000000001CCD0000-0x000000001CD20000-memory.dmp
memory/4136-16-0x000000001CDE0000-0x000000001CE92000-memory.dmp
memory/4136-17-0x0000000003020000-0x000000000302C000-memory.dmp
memory/4136-18-0x00000000030E0000-0x00000000030F2000-memory.dmp
memory/4176-0-0x00000000003B0000-0x00000000006D4000-memory.dmp
memory/4176-1-0x000000001B420000-0x000000001B430000-memory.dmp
memory/4176-9-0x00000000010C0000-0x00000000010D2000-memory.dmp
memory/4176-8-0x0000000000DF0000-0x0000000000DFC000-memory.dmp