Analysis
- max time kernel
149s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240802-en - resource tags
- submitted
02/10/2024, 22:40
General
- Target Client-built.exe
- Size 3.1MB
- Sample241002-2lywkavdkb
- SHA256 228d8c27e9a6f31c5054f4fd8bc500d320b3ec7a5f73e8a9a7e55ad0c1aba354
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
SmelyFish-64587.portmap.host:64587
-
127.0.0.1:8848
-
62930e89-a8af-4aeb-9762-793660b8fd22
-
encryption_key
6916B70297463FD84D7A838B55B1C9C230B746A8
-
install_name
FileSystem.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
FileSystem
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in Program Files directory 5 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 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-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "FileSystem" /sc ONLOGON /tr "C:\Program Files\SubDir\FileSystem.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Program Files\SubDir\FileSystem.exe"C:\Program Files\SubDir\FileSystem.exe"2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "FileSystem" /sc ONLOGON /tr "C:\Program Files\SubDir\FileSystem.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
FileSystem.exe
memory/3064-0-0x00007FF873D43000-0x00007FF873D45000-memory.dmp
memory/3064-1-0x00000000007B0000-0x0000000000AD4000-memory.dmp
memory/3064-2-0x00007FF873D40000-0x00007FF874801000-memory.dmp
memory/3064-10-0x00007FF873D40000-0x00007FF874801000-memory.dmp
memory/4500-9-0x00007FF873D40000-0x00007FF874801000-memory.dmp
memory/4500-11-0x00007FF873D40000-0x00007FF874801000-memory.dmp
memory/4500-12-0x000000001C180000-0x000000001C1D0000-memory.dmp
memory/4500-13-0x000000001C290000-0x000000001C342000-memory.dmp
memory/4500-14-0x00007FF873D40000-0x00007FF874801000-memory.dmp