Analysis
- max time kernel
1799s - max time network
1801s - platform
windows10-2004_x64 - resource
win10v2004-20241007-en - resource tags
- submitted
13/10/2024, 03:50
General
- Target Client-built.exe
- Size 3.1MB
- Sample241013-ed98assblm
- SHA256 c35a97e48628f0f3d9e8c9bf6883f84ded7b16fe9bf3df26f03c299d251699ba
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
andrewtechsystem-55917.portmap.host:55917
-
05b04543-4b6b-454b-8e43-cdb3e2417697
-
encryption_key
2768FC420BBDB207C1C2BCB0871CA3A838588A4A
-
install_name
Windows File Explorer.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
explorer.exe
-
subdirectory
Roaming
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 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 2 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 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 "explorer.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Roaming\Windows File Explorer.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Roaming\Roaming\Windows File Explorer.exe"C:\Users\Admin\AppData\Roaming\Roaming\Windows File Explorer.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 "explorer.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Roaming\Windows File Explorer.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
Windows File Explorer.exe
memory/1816-10-0x00007FFDBE6E0000-0x00007FFDBF1A1000-memory.dmp
memory/1816-11-0x00007FFDBE6E0000-0x00007FFDBF1A1000-memory.dmp
memory/1816-12-0x000000001CA20000-0x000000001CA70000-memory.dmp
memory/1816-13-0x000000001CB30000-0x000000001CBE2000-memory.dmp
memory/1816-14-0x00007FFDBE6E0000-0x00007FFDBF1A1000-memory.dmp
memory/4488-0-0x00007FFDBE6E3000-0x00007FFDBE6E5000-memory.dmp
memory/4488-1-0x0000000000320000-0x0000000000644000-memory.dmp
memory/4488-2-0x00007FFDBE6E0000-0x00007FFDBF1A1000-memory.dmp
memory/4488-9-0x00007FFDBE6E0000-0x00007FFDBF1A1000-memory.dmp