Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240426-en - resource tags
- submitted
02/05/2024, 01:44
General
- Target 906745e760108f29a15f0a4b3db9b140cc9bd5376a4e721c0d96c3df73474f5c.exe
- Size 3.1MB
- Sample240502-b5636sff84
- SHA256 906745e760108f29a15f0a4b3db9b140cc9bd5376a4e721c0d96c3df73474f5c
Malware Config
Extracted
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quasar
-
1.4.1
-
Office04
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93.123.85.108:4782
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e14b8f59-979b-4ebf-8602-dd3c4d6c301e
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encryption_key
534734397C0FA9A1D28F061AD75DF4100BFF5787
-
install_name
Msconfig.exe
-
log_directory
Logs
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reconnect_delay
3000
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startup_key
msconfig.exe
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Detects Windows executables referencing non-Windows User-Agents 2 IoCs
- Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs
- Detects executables containing common artifacts observed in infostealers 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 5 IoCs
- 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 6 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\906745e760108f29a15f0a4b3db9b140cc9bd5376a4e721c0d96c3df73474f5c.exe"C:\Users\Admin\AppData\Local\Temp\906745e760108f29a15f0a4b3db9b140cc9bd5376a4e721c0d96c3df73474f5c.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 "msconfig.exe" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Msconfig.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\system32\SubDir\Msconfig.exe"C:\Windows\system32\SubDir\Msconfig.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "msconfig.exe" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Msconfig.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
Msconfig.exe
memory/2240-10-0x00007FFA3AA50000-0x00007FFA3B511000-memory.dmp
memory/2240-11-0x00007FFA3AA50000-0x00007FFA3B511000-memory.dmp
memory/2240-12-0x000000001BC90000-0x000000001BCE0000-memory.dmp
memory/2240-13-0x000000001C3B0000-0x000000001C462000-memory.dmp
memory/2240-14-0x00007FFA3AA50000-0x00007FFA3B511000-memory.dmp
memory/4740-0-0x00007FFA3AA53000-0x00007FFA3AA55000-memory.dmp
memory/4740-1-0x0000000000380000-0x00000000006A4000-memory.dmp
memory/4740-2-0x00007FFA3AA50000-0x00007FFA3B511000-memory.dmp
memory/4740-9-0x00007FFA3AA50000-0x00007FFA3B511000-memory.dmp