Analysis
- max time kernel
126s - max time network
142s - platform
windows10-2004_x64 - resource
win10v2004-20240412-en - resource tags
- submitted
17/04/2024, 15:18
General
- Target Client-built.exe
- Size 3.1MB
- Sample240417-spm4ssdf86
- SHA256 5bc8c6aa7ccb11de2b19cabc08c096025da18e7898c5e8227ef109c266820f82
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
192.168.1.240:4782
-
fcdb4cfb-dc40-4f51-b2c7-f723b5404e35
-
encryption_key
1074AFFC8845D6B93DCAD37B9C170AE9CD58D08A
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Windowsstartup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 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
-
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 "Windowsstartup" /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 SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windowsstartup" /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
memory/1620-9-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp
memory/1620-10-0x000000001B530000-0x000000001B540000-memory.dmp
memory/1620-11-0x000000001BC30000-0x000000001BC80000-memory.dmp
memory/1620-12-0x000000001BD40000-0x000000001BDF2000-memory.dmp
memory/1620-13-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp
memory/3928-0-0x0000000000C10000-0x0000000000F34000-memory.dmp
memory/3928-1-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp
memory/3928-2-0x000000001BCB0000-0x000000001BCC0000-memory.dmp
memory/3928-8-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp