Analysis
- max time kernel
191s - max time network
208s - platform
windows10-2004_x64 - resource
win10v2004-20220414-en - submitted
12/05/2022, 15:38
General
- Target f43704733fbb8efbc457bb922c529df7e358cd26f7d99f0ec4c4cbb748d816d1.exe
- Size 557KB
- Sample220512-s24bjsacg9
- SHA256 f43704733fbb8efbc457bb922c529df7e358cd26f7d99f0ec4c4cbb748d816d1
Malware Config
Extracted
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quasar
-
2.1.0.0
-
Office04
-
127.0.0.1:4782
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VNM_MUTEX_iRne81OIv7xHkBnmxo
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encryption_key
btGyLN1mMyjkKPSibgiM
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install_name
Client.exe
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log_directory
Logs
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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.
- Adds Run key to start application 2 TTPs 1 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.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Creates scheduled task(s) 1 TTPs 1 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
Processes
-
C:\Users\Admin\AppData\Local\Temp\f43704733fbb8efbc457bb922c529df7e358cd26f7d99f0ec4c4cbb748d816d1.exe"C:\Users\Admin\AppData\Local\Temp\f43704733fbb8efbc457bb922c529df7e358cd26f7d99f0ec4c4cbb748d816d1.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\Qparrgldtgy.exe"C:\Users\Admin\AppData\Local\Temp\Qparrgldtgy.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Qparrgldtgy.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
Qparrgldtgy.exe
Qparrgldtgy.exe
memory/4144-130-0x0000000000400000-0x0000000000494000-memory.dmp
memory/4144-131-0x0000000004B50000-0x00000000050F4000-memory.dmp
memory/4144-132-0x00000000049B0000-0x0000000004A42000-memory.dmp
memory/4144-133-0x0000000004AF0000-0x0000000004AFA000-memory.dmp
memory/4636-137-0x00000000005A0000-0x0000000000656000-memory.dmp
memory/4636-138-0x00000000050D0000-0x0000000005136000-memory.dmp
memory/4636-139-0x0000000005CF0000-0x0000000005D02000-memory.dmp
memory/4636-140-0x0000000006120000-0x000000000615C000-memory.dmp