Analysis
- max time kernel
101s - max time network
136s - platform
windows11-21h2_x64 - resource
win11-20250502-en - resource tags
- submitted
11/05/2025, 02:22
General
- Target Client-built.exe
- Size 3.2MB
- Sample250511-ctk71awjs7
- SHA256 4bd736e9b854135e6c3f7f26d8666f7c227dfa111848ecf7ff769373cddeefd2
Malware Config
Extracted
-
quasar
-
1.4.1
-
Thanh
-
192.168.1.12:4782
-
Huy1612-24727.portmap.io:24727
-
d25883e4-22c3-4359-a963-432e70729185
-
encryption_key
D47A3BFB603AC05E18027C5EFBB8D5663AB6949C
-
install_name
Antimalware Service Executable.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Antimalware Service Executable
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar family
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 5 IoCs
- 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 2 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
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Antimalware Service Executable" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Antimalware Service Executable.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Windows\system32\SubDir\Antimalware Service Executable.exe"C:\Windows\system32\SubDir\Antimalware Service Executable.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Antimalware Service Executable" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Antimalware Service Executable.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Antimalware Service Executable.exe
memory/4932-10-0x00007FFD9B040000-0x00007FFD9BB02000-memory.dmp
memory/4932-11-0x00007FFD9B040000-0x00007FFD9BB02000-memory.dmp
memory/4932-12-0x000000001C2F0000-0x000000001C340000-memory.dmp
memory/4932-13-0x000000001C400000-0x000000001C4B2000-memory.dmp
memory/4932-14-0x00007FFD9B040000-0x00007FFD9BB02000-memory.dmp
memory/4932-17-0x000000001C3A0000-0x000000001C3B2000-memory.dmp
memory/4932-18-0x000000001D010000-0x000000001D04C000-memory.dmp
memory/6136-0-0x00007FFD9B043000-0x00007FFD9B045000-memory.dmp
memory/6136-1-0x0000000000D60000-0x0000000001094000-memory.dmp
memory/6136-2-0x00007FFD9B040000-0x00007FFD9BB02000-memory.dmp
memory/6136-9-0x00007FFD9B040000-0x00007FFD9BB02000-memory.dmp