Analysis
- max time kernel
1800s - max time network
1161s - platform
windows10-2004_x64 - resource
win10v2004-20231023-en - resource tags
- submitted
27/11/2023, 09:32
General
- Target Client-built.exe
- Size 3.1MB
- Sample231127-lhmq5aff95
- SHA256 4b4fb5711222878e343088374f7437bce99a5916d7e5c410b2763fde8d91ec63
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
127.0.0.7:5053
-
127.0.0.7:5054
-
6f01cc79-8527-4436-a34a-473fcf92b46f
-
encryption_key
D52EA8296126E8DD7D221BC02E2826F1CAA96C78
-
install_name
Client.exe
-
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 3 IoCs
- Executes dropped EXE 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- 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 FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 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⤵
- Creates scheduled task(s)
-
-
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 FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- 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⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
Client.exe
memory/2956-9-0x00007FFD6DAA0000-0x00007FFD6E561000-memory.dmp
memory/2956-11-0x000000001B120000-0x000000001B130000-memory.dmp
memory/2956-12-0x000000001C010000-0x000000001C060000-memory.dmp
memory/2956-13-0x000000001C120000-0x000000001C1D2000-memory.dmp
memory/2956-14-0x00007FFD6DAA0000-0x00007FFD6E561000-memory.dmp
memory/2956-15-0x000000001B120000-0x000000001B130000-memory.dmp
memory/3696-0-0x0000000000AE0000-0x0000000000E04000-memory.dmp
memory/3696-1-0x00007FFD6DAA0000-0x00007FFD6E561000-memory.dmp
memory/3696-2-0x000000001BBA0000-0x000000001BBB0000-memory.dmp
memory/3696-10-0x00007FFD6DAA0000-0x00007FFD6E561000-memory.dmp