Analysis
- max time kernel
136s - max time network
158s - platform
windows11-21h2_x64 - resource
win11-20240221-en - resource tags
- submitted
01/03/2024, 17:09
General
- Target Client-built.exe
- Size 3.1MB
- Sample240301-vn8p8aaf77
- SHA256 cc4491424f6fb4a714bc0ac6471ea3ed5e40f0bd6d452e79198781faa643359a
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
192.168.56.1:4782
-
4b954fab-7429-499a-ab6b-df9c5e3096d7
-
encryption_key
D75601A171551C23C0EEACEE58E7D707A2C948C8
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
TestWindows
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 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 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
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "TestWindows" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "TestWindows" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
memory/2876-9-0x00007FFDC4F60000-0x00007FFDC5A22000-memory.dmp
memory/2876-10-0x000000001B3E0000-0x000000001B3F0000-memory.dmp
memory/2876-11-0x000000001C1D0000-0x000000001C220000-memory.dmp
memory/2876-12-0x000000001C2E0000-0x000000001C392000-memory.dmp
memory/2876-13-0x00007FFDC4F60000-0x00007FFDC5A22000-memory.dmp
memory/2876-14-0x000000001B3E0000-0x000000001B3F0000-memory.dmp
memory/4460-0-0x0000000000860000-0x0000000000B84000-memory.dmp
memory/4460-1-0x00007FFDC4F60000-0x00007FFDC5A22000-memory.dmp
memory/4460-2-0x000000001B820000-0x000000001B830000-memory.dmp
memory/4460-8-0x00007FFDC4F60000-0x00007FFDC5A22000-memory.dmp