Analysis
- max time kernel
148s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
03/02/2024, 18:47
General
- Target Client-built.exe
- Size 3.1MB
- Sample240203-xe6klsfhf2
- SHA256 832714b9029ad815ef3d2cb04ab32613e5683ad8c4ad7442e0797989625891c3
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
127.0.01:4782
-
d0814518-bc52-4b44-817c-1a00ad8f4852
-
encryption_key
A43C9260053F7640121E2118AE584149A3055BCB
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
office
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 5 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 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 "office" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- 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 "office" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
Client.exe
memory/3820-10-0x00007FFD48E80000-0x00007FFD49941000-memory.dmp
memory/3820-11-0x0000000002CF0000-0x0000000002D00000-memory.dmp
memory/3820-12-0x000000001C7F0000-0x000000001C840000-memory.dmp
memory/3820-13-0x000000001C900000-0x000000001C9B2000-memory.dmp
memory/3820-14-0x00007FFD48E80000-0x00007FFD49941000-memory.dmp
memory/3820-15-0x0000000002CF0000-0x0000000002D00000-memory.dmp
memory/4548-0-0x0000000000A40000-0x0000000000D64000-memory.dmp
memory/4548-1-0x00007FFD48E80000-0x00007FFD49941000-memory.dmp
memory/4548-2-0x000000001B9A0000-0x000000001B9B0000-memory.dmp
memory/4548-9-0x00007FFD48E80000-0x00007FFD49941000-memory.dmp