Analysis
- max time kernel
146s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
15/10/2022, 06:20
General
- Target 17e6bffaff1ea223913deb1bc78e74ae.exe
- Size 534KB
- Sample221015-g3q7tsfcd3
- SHA256 af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e
Malware Config
Extracted
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quasar
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2.1.0.0
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asdf
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checkme12.freeddns.org:1604
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VNM_MUTEX_yidaALoSEROfTPWHwX
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encryption_key
TbfVFQWqb0uiZoBjJ9E9
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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
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subdirectory
UPX
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.
- Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 IoCs
- VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
- Executes dropped EXE 1 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
- 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 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 10 IoCs
- Suspicious use of AdjustPrivilegeToken 5 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 30 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\17e6bffaff1ea223913deb1bc78e74ae.exe"C:\Users\Admin\AppData\Local\Temp\17e6bffaff1ea223913deb1bc78e74ae.exe"1⤵
- Modifies Windows Defender Real-time Protection settings
- Checks computer location settings
- Windows security modification
- Suspicious behavior: EnumeratesProcesses
- 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\17e6bffaff1ea223913deb1bc78e74ae.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Roaming\UPX\Client.exe"C:\Users\Admin\AppData\Roaming\UPX\Client.exe"2⤵
- Executes dropped EXE
- 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\Roaming\UPX\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"powershell" Get-MpPreference -verbose2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*3⤵
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\79wvvXcR3PmB.bat" "2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\chcp.comchcp 650013⤵
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C:\Windows\SysWOW64\PING.EXEping -n 10 localhost3⤵
- Runs ping.exe
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C:\Users\Admin\AppData\Local\Temp\17e6bffaff1ea223913deb1bc78e74ae.exe"C:\Users\Admin\AppData\Local\Temp\17e6bffaff1ea223913deb1bc78e74ae.exe"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
17e6bffaff1ea223913deb1bc78e74ae.exe.log
79wvvXcR3PmB.bat
Client.exe
Client.exe
memory/2872-150-0x0000000006E50000-0x0000000006E82000-memory.dmp
memory/2872-154-0x0000000006F90000-0x0000000006FAA000-memory.dmp
memory/2872-159-0x00000000072B0000-0x00000000072B8000-memory.dmp
memory/2872-143-0x00000000022E0000-0x0000000002316000-memory.dmp
memory/2872-144-0x0000000004D80000-0x00000000053A8000-memory.dmp
memory/2872-145-0x0000000004D40000-0x0000000004D62000-memory.dmp
memory/2872-146-0x00000000054A0000-0x0000000005506000-memory.dmp
memory/2872-147-0x0000000005C90000-0x0000000005CAE000-memory.dmp
memory/2872-158-0x00000000072D0000-0x00000000072EA000-memory.dmp
memory/2872-157-0x00000000071C0000-0x00000000071CE000-memory.dmp
memory/2872-156-0x0000000007210000-0x00000000072A6000-memory.dmp
memory/2872-151-0x000000006FCE0000-0x000000006FD2C000-memory.dmp
memory/2872-152-0x0000000006240000-0x000000000625E000-memory.dmp
memory/2872-153-0x00000000075D0000-0x0000000007C4A000-memory.dmp
memory/2872-155-0x0000000007000000-0x000000000700A000-memory.dmp
memory/3096-149-0x00000000065A0000-0x00000000065AA000-memory.dmp
memory/4928-137-0x00000000060F0000-0x000000000612C000-memory.dmp
memory/4928-136-0x0000000005CC0000-0x0000000005CD2000-memory.dmp
memory/4928-135-0x0000000004E50000-0x0000000004EB6000-memory.dmp
memory/4928-134-0x0000000004D40000-0x0000000004DD2000-memory.dmp
memory/4928-132-0x0000000000260000-0x00000000002EC000-memory.dmp
memory/4928-133-0x00000000052F0000-0x0000000005894000-memory.dmp