Analysis
- max time kernel
153s - max time network
158s - platform
windows10-2004_x64 - resource
win10v2004-20220414-en - submitted
12/05/2022, 11:56
General
- Target 54e33e90fc6174e079fbb5d00abd7f3d2c8ad9bcc8c67910f3c21e4f31282aa0.exe
- Size 485KB
- Sample220512-n39shagcdr
- SHA256 54e33e90fc6174e079fbb5d00abd7f3d2c8ad9bcc8c67910f3c21e4f31282aa0
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 2 IoCs
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\54e33e90fc6174e079fbb5d00abd7f3d2c8ad9bcc8c67910f3c21e4f31282aa0.exe"C:\Users\Admin\AppData\Local\Temp\54e33e90fc6174e079fbb5d00abd7f3d2c8ad9bcc8c67910f3c21e4f31282aa0.exe"1⤵
- Checks computer location settings
- Drops desktop.ini file(s)
- Drops file in Windows directory
- 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:\Windows\Microsoft.NET\Framework\v2.0.50727\dw20.exedw20.exe -x -s 11642⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
$77-Venom.exe
$77-Venom.exe
memory/2652-130-0x00000000749A0000-0x0000000074F51000-memory.dmp
memory/4248-135-0x00000000002B0000-0x000000000033C000-memory.dmp
memory/4248-136-0x00000000052A0000-0x0000000005844000-memory.dmp
memory/4248-137-0x0000000004D90000-0x0000000004E22000-memory.dmp
memory/4248-138-0x0000000005130000-0x0000000005196000-memory.dmp
memory/4248-139-0x0000000005D10000-0x0000000005D22000-memory.dmp
memory/4248-140-0x0000000006140000-0x000000000617C000-memory.dmp
memory/4248-141-0x0000000006440000-0x000000000644A000-memory.dmp