Analysis
- max time kernel
149s - max time network
149s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
20/01/2024, 18:55
General
- Target Client.exe
- Size 3.2MB
- Sample240120-xkrnmsfca3
- SHA256 c26c0c278655f9edd48624a9181f44b070dfd0e3331e910a76466f1373648e81
Malware Config
Extracted
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quasar
-
1.4.1
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Office04
-
247.45.183.207:4782
-
e18fc961-9411-45f1-a9d4-bd71bfe35096
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encryption_key
4038901489FB4E8014A0DA74DC0CBFBD4D0D61E8
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install_name
fnspoofer.exe
-
log_directory
Logs
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reconnect_delay
3000
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startup_key
1 1 1 1 1
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 IoCs
- Executes dropped EXE 1 IoCs
- Adds Run key to start application 2 TTPs 2 IoCs
- Drops file in System32 directory 2 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 FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 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\Client.exe"C:\Users\Admin\AppData\Local\Temp\Client.exe"1⤵
- Adds Run key to start application
- 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 " 1 1 1 1 1" /sc ONLOGON /tr "C:\Windows\system32\SubDir\fnspoofer.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
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C:\Windows\system32\SubDir\fnspoofer.exe"C:\Windows\system32\SubDir\fnspoofer.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- 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 " 1 1 1 1 1" /sc ONLOGON /tr "C:\Windows\system32\SubDir\fnspoofer.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
fnspoofer.exe
fnspoofer.exe
memory/748-9-0x00007FF944EA0000-0x00007FF945961000-memory.dmp
memory/748-10-0x000000001B920000-0x000000001B930000-memory.dmp
memory/748-11-0x000000001C180000-0x000000001C1D0000-memory.dmp
memory/748-12-0x000000001C290000-0x000000001C342000-memory.dmp
memory/748-13-0x00007FF944EA0000-0x00007FF945961000-memory.dmp
memory/748-14-0x000000001B920000-0x000000001B930000-memory.dmp
memory/4032-0-0x0000000000660000-0x0000000000994000-memory.dmp
memory/4032-1-0x00007FF944EA0000-0x00007FF945961000-memory.dmp
memory/4032-2-0x000000001B510000-0x000000001B520000-memory.dmp
memory/4032-8-0x00007FF944EA0000-0x00007FF945961000-memory.dmp