Analysis
- max time kernel
147s - max time network
156s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
08/04/2024, 22:28
General
- Target 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe
- Size 3.1MB
- Sample240408-2dpb6aha41
- SHA256 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
10.127.0.54:4782
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76898c6c-aad7-493e-ad05-6bb072bc1ab9
-
encryption_key
E0AA33A7353AC58B6995079C718A83EE5609573D
-
install_name
Twrek.exe
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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 payload 2 IoCs
- Detects Windows executables referencing non-Windows User-Agents 2 IoCs
- Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs
- Detects executables containing common artifacts observed in infostealers 2 IoCs
- Executes dropped EXE 1 IoCs
- Creates scheduled task(s) 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
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C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe"C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.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\Twrek.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
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C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe"C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- 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\Twrek.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Twrek.exe
memory/1008-0-0x00000000006C0000-0x00000000009E4000-memory.dmp
memory/1008-1-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp
memory/1008-2-0x0000000002AD0000-0x0000000002AE0000-memory.dmp
memory/1008-13-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp
memory/4264-9-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp
memory/4264-10-0x000000001BB20000-0x000000001BB30000-memory.dmp
memory/4264-11-0x000000001BA60000-0x000000001BAB0000-memory.dmp
memory/4264-12-0x000000001C2E0000-0x000000001C392000-memory.dmp
memory/4264-14-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp
memory/4264-15-0x000000001BB20000-0x000000001BB30000-memory.dmp