Analysis
- max time kernel
143s - max time network
149s - platform
windows10-2004_x64 - resource
win10v2004-20220414-en - submitted
12/05/2022, 11:56
General
- Target 90e165246c0518ce77a98adbe2cd589bdc75d162f23fde3e7f837882b8facd2f.exe
- Size 503KB
- Sample220512-n33n7agccn
- SHA256 90e165246c0518ce77a98adbe2cd589bdc75d162f23fde3e7f837882b8facd2f
Malware Config
Extracted
-
quasar
-
2.1.0.0
-
svhost
-
myconect.ddns.net:6606
-
VNM_MUTEX_ND6PULLW5ZVLwo1nwR
-
encryption_key
yaa63tXY4j55os5llHHd
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Venom Client Startup
-
subdirectory
SubDir
Signatures
- Contains code to disable Windows Defender 3 IoCs
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
- Quasar Payload 3 IoCs
- Quasar RAT
Quasar is an open source Remote Access Tool.
- VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
- suricata: ET MALWARE Common RAT Connectivity Check Observed
suricata: ET MALWARE Common RAT Connectivity Check Observed
- Executes dropped EXE 1 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Drops desktop.ini file(s) 2 IoCs
- Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Drops file in Windows directory 3 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
- Enumerates system info in registry 2 TTPs 3 IoCs
- Modifies registry class 1 IoCs
- Suspicious behavior: AddClipboardFormatListener 2 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 8 IoCs
- Suspicious use of WriteProcessMemory 5 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\90e165246c0518ce77a98adbe2cd589bdc75d162f23fde3e7f837882b8facd2f.exe"C:\Users\Admin\AppData\Local\Temp\90e165246c0518ce77a98adbe2cd589bdc75d162f23fde3e7f837882b8facd2f.exe"1⤵
- Checks computer location settings
- Drops desktop.ini file(s)
- Drops file in Windows directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\$77-Venom.exe"C:\Users\Admin\AppData\Roaming\$77-Venom.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
-
C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE"C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Roaming\null (2).docx" /o ""2⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
$77-Venom.exe
$77-Venom.exe
null (2).docx
memory/2760-130-0x0000000074AF0000-0x00000000750A1000-memory.dmp
memory/3488-136-0x0000000005D60000-0x0000000006304000-memory.dmp
memory/3488-143-0x00000000058A0000-0x0000000005906000-memory.dmp
memory/3488-134-0x0000000000E50000-0x0000000000EDC000-memory.dmp
memory/3488-137-0x0000000005930000-0x00000000059C2000-memory.dmp
memory/3488-149-0x0000000006FE0000-0x0000000006FEA000-memory.dmp
memory/3488-146-0x0000000006CE0000-0x0000000006D1C000-memory.dmp
memory/3488-144-0x00000000068B0000-0x00000000068C2000-memory.dmp
memory/4336-139-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp
memory/4336-142-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp
memory/4336-141-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp
memory/4336-145-0x00007FF9EA9B0000-0x00007FF9EA9C0000-memory.dmp
memory/4336-140-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp
memory/4336-147-0x00007FF9EA9B0000-0x00007FF9EA9C0000-memory.dmp
memory/4336-138-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp
memory/4336-151-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp
memory/4336-152-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp
memory/4336-153-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp
memory/4336-154-0x00007FF9ED310000-0x00007FF9ED320000-memory.dmp