Analysis
- max time kernel
201s - max time network
227s - platform
windows10-2004_x64 - resource
win10v2004-20220414-en - submitted
12/05/2022, 15:47
General
- Target 19f0abf0648c4c993b02b50b4e35224b64ff45b9748dd9dc36c68cf1b42dcbdd.exe
- Size 610KB
- Sample220512-s8f5laaeh9
- SHA256 19f0abf0648c4c993b02b50b4e35224b64ff45b9748dd9dc36c68cf1b42dcbdd
Malware Config
Extracted
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quasar
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2.1.0.0
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svhost
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myconect.ddns.net:6606
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VNM_MUTEX_rHOHbrAQKctPD4d68w
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encryption_key
rDFwhCyuKMqXO7llDpB2
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Venom Client Startup
-
subdirectory
SubDir
Signatures
- Contains code to disable Windows Defender 4 IoCs
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
- Modifies Windows Defender Real-time Protection settings 3 TTPs
- Quasar Payload 4 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 W32/Quasar 1.3/Venom RAT Connectivity Check 3
suricata: ET MALWARE W32/Quasar 1.3/Venom RAT Connectivity Check 3
- Executes dropped EXE 2 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Windows security modification 2 TTPs 2 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Looks up external IP address via web service 2 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 1 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\19f0abf0648c4c993b02b50b4e35224b64ff45b9748dd9dc36c68cf1b42dcbdd.exe"C:\Users\Admin\AppData\Local\Temp\19f0abf0648c4c993b02b50b4e35224b64ff45b9748dd9dc36c68cf1b42dcbdd.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe"C:\Users\Admin\AppData\Local\Temp\Pnabmtbcti.exe"2⤵
- Executes dropped EXE
- Windows security modification
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- 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\Pnabmtbcti.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"3⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
Pnabmtbcti.exe
Pnabmtbcti.exe
Client.exe
memory/1184-140-0x00000000065F0000-0x0000000006602000-memory.dmp
memory/1184-138-0x0000000000CB0000-0x0000000000D5A000-memory.dmp
memory/1184-139-0x00000000059A0000-0x0000000005A06000-memory.dmp
memory/4932-134-0x0000000004F60000-0x0000000004F6A000-memory.dmp
memory/4932-133-0x0000000004890000-0x0000000004922000-memory.dmp
memory/4932-131-0x0000000000400000-0x000000000049E000-memory.dmp
memory/4932-132-0x0000000004980000-0x0000000004F24000-memory.dmp