Analysis
- max time kernel
90s - max time network
286s - platform
windows11-21h2_x64 - resource
win11-20240508-en - resource tags
- submitted
01/06/2024, 23:37
General
- Target Client-built.exe
- Size 3.1MB
- Sample240601-3mfxtaah8w
- SHA256 3797626bb8fb9703283002f9fe59c8e0b55292a180efdae1b8b3faace9f6c899
Malware Config
Extracted
-
quasar
-
1.4.1
-
FUD
-
runderscore00-61208.portmap.host:61208
-
41104e3a-44c7-4cb0-8bde-1a3c82e695fa
-
encryption_key
0185F96AF587188E173301C437AB89C8912A9718
-
install_name
$sxr-powershell.exe
-
log_directory
$sxr-Logs
-
reconnect_delay
3000
-
startup_key
Powershell
-
subdirectory
$sxr-seroxen2
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 "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe"C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.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 "Powershell" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\$sxr-seroxen2\$sxr-powershell.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
$sxr-powershell.exe
memory/2092-0-0x00007FFB2CC93000-0x00007FFB2CC95000-memory.dmp
memory/2092-1-0x0000000000FC0000-0x00000000012E4000-memory.dmp
memory/2092-2-0x00007FFB2CC90000-0x00007FFB2D752000-memory.dmp
memory/2092-9-0x00007FFB2CC90000-0x00007FFB2D752000-memory.dmp
memory/4460-11-0x00007FFB2CC90000-0x00007FFB2D752000-memory.dmp
memory/4460-10-0x00007FFB2CC90000-0x00007FFB2D752000-memory.dmp
memory/4460-12-0x000000001B170000-0x000000001B1C0000-memory.dmp
memory/4460-13-0x000000001BB10000-0x000000001BBC2000-memory.dmp
memory/4460-16-0x000000001B1F0000-0x000000001B202000-memory.dmp
memory/4460-17-0x000000001BA50000-0x000000001BA8C000-memory.dmp
memory/4460-18-0x00007FFB2CC90000-0x00007FFB2D752000-memory.dmp
memory/4460-19-0x00007FFB2CC90000-0x00007FFB2D752000-memory.dmp