Analysis
- max time kernel
92s - max time network
94s - platform
windows10-2004_x64 - resource
win10v2004-20240709-en - resource tags
- submitted
21/07/2024, 23:16
General
- Target Client-built.exe
- Size 3.1MB
- Sample240721-29d63azcpc
- SHA256 9376c03517ce29bf94817da91aa034685c827fe8dadc19dcaab817dceafe8f64
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
192.168.11.20:4782
-
18f9922e-d378-4916-842c-aa77698839ed
-
encryption_key
2C302960A864412274D2ACC228109C45F5512341
-
install_name
Client.exe
-
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 payload 2 IoCs
- Executes dropped EXE 1 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⤵
- 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 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
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
Client.exe
memory/2452-10-0x00007FF975600000-0x00007FF9760C1000-memory.dmp
memory/2452-11-0x00007FF975600000-0x00007FF9760C1000-memory.dmp
memory/2452-12-0x000000001B6E0000-0x000000001B730000-memory.dmp
memory/2452-13-0x000000001B7F0000-0x000000001B8A2000-memory.dmp
memory/2452-14-0x00007FF975600000-0x00007FF9760C1000-memory.dmp
memory/4900-0-0x00007FF975603000-0x00007FF975605000-memory.dmp
memory/4900-1-0x0000000000090000-0x00000000003B4000-memory.dmp
memory/4900-2-0x00007FF975600000-0x00007FF9760C1000-memory.dmp
memory/4900-9-0x00007FF975600000-0x00007FF9760C1000-memory.dmp