Analysis
- max time kernel
134s - max time network
153s - platform
windows10-2004_x64 - resource
win10v2004-20230220-en - resource tags
- submitted
27/02/2023, 01:36
General
- Target 680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe
- Size 439KB
- Sample230227-b1py4abd43
- SHA256 680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75
Malware Config
Extracted
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quasar
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1.4.0.0
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Office04
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67.213.221.18:7812
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KFoYp486ql6lO6U0qI
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encryption_key
OtItMK9boIZNOQTejUzg
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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 Services
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 6 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 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.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 12 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe"C:\Users\Admin\AppData\Local\Temp\680caf0e30b204544971d053b635ed0e3f1dee3332d9eab8a08b3f04cd7ecd75.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\Windows Security.exe"C:\Users\Admin\AppData\Roaming\Windows Security.exe"2⤵
- Executes dropped EXE
- 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\Roaming\Windows Security.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Roaming\Windows Services\Windows Security.exe"C:\Users\Admin\AppData\Roaming\Windows Services\Windows Security.exe"3⤵
- 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 Services\Windows Security.exe" /rl HIGHEST /f4⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
Windows Security.exe.log
Windows Security.exe
Windows Security.exe
Windows Security.exe
Windows Security.exe
Windows Security.exe
memory/1332-163-0x00000000049B0000-0x00000000049C0000-memory.dmp
memory/1332-162-0x0000000006150000-0x000000000615A000-memory.dmp
memory/1332-160-0x00000000049B0000-0x00000000049C0000-memory.dmp
memory/3080-133-0x00000000006F0000-0x0000000000700000-memory.dmp
memory/4920-146-0x00000000007D0000-0x000000000081E000-memory.dmp
memory/4920-152-0x00000000064E0000-0x000000000651C000-memory.dmp
memory/4920-151-0x00000000060C0000-0x00000000060D2000-memory.dmp
memory/4920-150-0x0000000005470000-0x00000000054D6000-memory.dmp
memory/4920-149-0x0000000005010000-0x0000000005020000-memory.dmp
memory/4920-148-0x0000000005160000-0x00000000051F2000-memory.dmp
memory/4920-147-0x0000000005710000-0x0000000005CB4000-memory.dmp