Analysis
- max time kernel
175s - max time network
206s - platform
windows10-2004_x64 - resource
win10v2004-20220414-en - submitted
11/05/2022, 02:37
General
- Target e39ab5bca5cebce3ca9ed90beb1cc9ec94b373bc895d5b961a0138e87d4086fd.exe
- Size 504KB
- Sample220511-c37scsdge2
- SHA256 e39ab5bca5cebce3ca9ed90beb1cc9ec94b373bc895d5b961a0138e87d4086fd
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\e39ab5bca5cebce3ca9ed90beb1cc9ec94b373bc895d5b961a0138e87d4086fd.exe"C:\Users\Admin\AppData\Local\Temp\e39ab5bca5cebce3ca9ed90beb1cc9ec94b373bc895d5b961a0138e87d4086fd.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/1420-130-0x0000000075480000-0x0000000075A31000-memory.dmp
memory/3736-144-0x0000000006000000-0x0000000006012000-memory.dmp
memory/3736-134-0x00000000008E0000-0x000000000096C000-memory.dmp
memory/3736-135-0x0000000005720000-0x0000000005CC4000-memory.dmp
memory/3736-137-0x0000000005280000-0x0000000005312000-memory.dmp
memory/3736-138-0x00000000051F0000-0x0000000005256000-memory.dmp
memory/3736-147-0x0000000006730000-0x000000000673A000-memory.dmp
memory/3736-145-0x0000000006430000-0x000000000646C000-memory.dmp
memory/4504-143-0x00007FF854B30000-0x00007FF854B40000-memory.dmp
memory/4504-142-0x00007FF854B30000-0x00007FF854B40000-memory.dmp
memory/4504-141-0x00007FF854B30000-0x00007FF854B40000-memory.dmp
memory/4504-146-0x00007FF852740000-0x00007FF852750000-memory.dmp
memory/4504-140-0x00007FF854B30000-0x00007FF854B40000-memory.dmp
memory/4504-148-0x00007FF852740000-0x00007FF852750000-memory.dmp
memory/4504-139-0x00007FF854B30000-0x00007FF854B40000-memory.dmp