Analysis
- max time kernel
137s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20220414-en - submitted
08/05/2022, 07:37
General
- Target 545d4b0dcf911ffdf44b5bf01dfef7be8421e05250806eb03ffb25e736961b80.exe
- Size 625KB
- Sample220508-jf4whsecdk
- SHA256 545d4b0dcf911ffdf44b5bf01dfef7be8421e05250806eb03ffb25e736961b80
Malware Config
Extracted
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quasar
-
2.1.0.0
-
1
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10.0.2.15:1337
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VNM_MUTEX_28broDsmlFWTzx7r3B
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encryption_key
0hi0YaDWMh7jhT37Tcsm
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
-
startup_key
Windows Defender
-
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 2 IoCs
- Checks computer location settings 2 TTPs 2 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 9 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\545d4b0dcf911ffdf44b5bf01dfef7be8421e05250806eb03ffb25e736961b80.exe"C:\Users\Admin\AppData\Local\Temp\545d4b0dcf911ffdf44b5bf01dfef7be8421e05250806eb03ffb25e736961b80.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\RarSFX0\Passwords.exe"C:\Users\Admin\AppData\Local\Temp\RarSFX0\Passwords.exe"2⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\Iwpblky.exe"C:\Users\Admin\AppData\Local\Temp\Iwpblky.exe"3⤵
- 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 "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Iwpblky.exe" /rl HIGHEST /f4⤵
- Creates scheduled task(s)
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-
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
Iwpblky.exe
Iwpblky.exe
Passwords.exe
Passwords.exe
memory/712-133-0x0000000000400000-0x0000000000460000-memory.dmp
memory/712-135-0x0000000004E80000-0x0000000004F12000-memory.dmp
memory/712-136-0x0000000002470000-0x000000000247A000-memory.dmp
memory/712-134-0x00000000048D0000-0x0000000004E74000-memory.dmp
memory/4832-140-0x0000000000B60000-0x0000000000BEC000-memory.dmp
memory/4832-141-0x00000000058C0000-0x0000000005926000-memory.dmp
memory/4832-142-0x00000000059D0000-0x00000000059E2000-memory.dmp
memory/4832-143-0x00000000068B0000-0x00000000068EC000-memory.dmp