Analysis
- max time kernel
130s - max time network
146s - platform
windows10-2004_x64 - resource
win10v2004-20231222-en - resource tags
- submitted
13/02/2024, 13:20
General
- Target 99862073a5f3df00516a49e3b78057b1.exe
- Size 635KB
- Sample240213-qlkhdsca79
- SHA256 bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2
Malware Config
Extracted
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quasar
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2.1.0.0
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Windows firewall
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23.105.131.187:7812
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VNM_MUTEX_zGeT5SjdI1pYgFyiav
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encryption_key
3kpwI2tkVNrXY2Mm5wlR
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install_name
Windows Security.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Windows Update
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subdirectory
Windows Firewall Updates
Signatures
- Contains code to disable Windows Defender 1 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 1 IoCs
- VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 2 IoCs
- 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 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Suspicious use of SetThreadContext 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 11 IoCs
- Suspicious use of AdjustPrivilegeToken 5 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 40 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"2⤵
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C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"2⤵
- 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 "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"4⤵
- 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 "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe" /rl HIGHEST /f5⤵
- Creates scheduled task(s)
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"powershell" Get-MpPreference -verbose3⤵
- 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%\* & exit3⤵
- 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\*4⤵
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\2x6w33cRv9qt.bat" "3⤵
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Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Create or Modify System Process
1Windows Service
1Scheduled Task/Job
1Replay Monitor
Loading Replay Monitor...
Downloads
99862073a5f3df00516a49e3b78057b1.exe.log
2x6w33cRv9qt.bat
__PSScriptPolicyTest_wwly55cj.bv4.ps1
Windows Security.exe
memory/1204-23-0x0000000005440000-0x0000000005450000-memory.dmp
memory/1204-22-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/1204-34-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/1500-5-0x0000000004CF0000-0x0000000004D82000-memory.dmp
memory/1500-3-0x00000000026C0000-0x00000000026CA000-memory.dmp
memory/1500-8-0x0000000004C50000-0x0000000004C5A000-memory.dmp
memory/1500-1-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/1500-13-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/1500-0-0x0000000000170000-0x0000000000214000-memory.dmp
memory/1500-2-0x0000000004CE0000-0x0000000004CF0000-memory.dmp
memory/1500-4-0x00000000052A0000-0x0000000005844000-memory.dmp
memory/1500-6-0x0000000004D90000-0x0000000004E2C000-memory.dmp
memory/1608-16-0x0000000006A50000-0x0000000006A8C000-memory.dmp
memory/1608-9-0x0000000000400000-0x000000000048C000-memory.dmp
memory/1608-82-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/1608-15-0x0000000005C20000-0x0000000005C32000-memory.dmp
memory/1608-14-0x00000000057D0000-0x0000000005836000-memory.dmp
memory/1608-12-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/2012-36-0x0000000006200000-0x0000000006266000-memory.dmp
memory/2012-63-0x0000000002EB0000-0x0000000002EC0000-memory.dmp
memory/2012-31-0x0000000002EB0000-0x0000000002EC0000-memory.dmp
memory/2012-24-0x0000000002FA0000-0x0000000002FD6000-memory.dmp
memory/2012-35-0x0000000005900000-0x0000000005922000-memory.dmp
memory/2012-29-0x0000000005B60000-0x0000000006188000-memory.dmp
memory/2012-28-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/2012-46-0x0000000006450000-0x00000000067A4000-memory.dmp
memory/2012-47-0x00000000068B0000-0x00000000068CE000-memory.dmp
memory/2012-48-0x0000000006970000-0x00000000069BC000-memory.dmp
memory/2012-25-0x0000000002EB0000-0x0000000002EC0000-memory.dmp
memory/2012-51-0x000000007F900000-0x000000007F910000-memory.dmp
memory/2012-53-0x000000006FAA0000-0x000000006FAEC000-memory.dmp
memory/2012-52-0x0000000007870000-0x00000000078A2000-memory.dmp
memory/2012-64-0x0000000006E70000-0x0000000006E8E000-memory.dmp
memory/2012-77-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/2012-65-0x00000000078B0000-0x0000000007953000-memory.dmp
memory/2012-66-0x0000000008230000-0x00000000088AA000-memory.dmp
memory/2012-67-0x0000000007BF0000-0x0000000007C0A000-memory.dmp
memory/2012-68-0x0000000007C60000-0x0000000007C6A000-memory.dmp
memory/2012-69-0x0000000007E70000-0x0000000007F06000-memory.dmp
memory/2012-70-0x0000000007DF0000-0x0000000007E01000-memory.dmp
memory/2012-71-0x0000000007E20000-0x0000000007E2E000-memory.dmp
memory/2012-72-0x0000000007E30000-0x0000000007E44000-memory.dmp
memory/2012-73-0x0000000007F30000-0x0000000007F4A000-memory.dmp
memory/2012-74-0x0000000007F10000-0x0000000007F18000-memory.dmp
memory/2028-32-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/2028-50-0x0000000006AC0000-0x0000000006ACA000-memory.dmp
memory/2028-33-0x00000000053D0000-0x00000000053E0000-memory.dmp
memory/2028-83-0x0000000074600000-0x0000000074DB0000-memory.dmp
memory/2028-84-0x00000000053D0000-0x00000000053E0000-memory.dmp