Analysis
- max time kernel
118s - max time network
122s - platform
windows7_x64 - resource
win7-20231023-en - resource tags
- submitted
20/11/2023, 22:42
General
- Target client.exe
- Size 3.1MB
- Sample231120-2mty1abc71
- SHA256 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
Malware Config
Extracted
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quasar
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1.4.1
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Office04
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127.0.0.1:7777
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e74501e4-0d13-44ea-ab56-f5adb400d53b
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encryption_key
122EFF89481AC09109CB9613ECDFDD3EE770EBD3
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
300000
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startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 4 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 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 use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\client.exe"C:\Users\Admin\AppData\Local\Temp\client.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
Client.exe
memory/1448-7-0x000007FEF5310000-0x000007FEF5CFC000-memory.dmp
memory/1448-9-0x00000000009A0000-0x0000000000CC4000-memory.dmp
memory/1448-10-0x000000001B1C0000-0x000000001B240000-memory.dmp
memory/1448-11-0x000007FEF5310000-0x000007FEF5CFC000-memory.dmp
memory/1448-12-0x000000001B1C0000-0x000000001B240000-memory.dmp
memory/3028-0-0x0000000000170000-0x0000000000494000-memory.dmp
memory/3028-1-0x000007FEF5310000-0x000007FEF5CFC000-memory.dmp
memory/3028-2-0x000000001B200000-0x000000001B280000-memory.dmp
memory/3028-8-0x000007FEF5310000-0x000007FEF5CFC000-memory.dmp