Analysis
- max time kernel
69s - max time network
72s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
31/03/2024, 16:51
General
- Target Client-built.exe
- Size 3.1MB
- Sample240331-vcye4sfg92
- SHA256 ff33af1a478c236bd260ba68e8f0c7e68ec912a93ba174fdfe476b6a8de71410
Malware Config
Extracted
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quasar
-
1.4.1
-
Office04
-
78.17.40.169:4782
-
c42aeb5f-442d-43d8-9044-c765c1ca1b99
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encryption_key
687CF235C1C0A46889C4A565EB4CE8085A1343E5
-
install_name
Client.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
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 behavior: LoadsDriver 6 IoCs
- 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⤵
- 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:\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 SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /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/3920-10-0x00007FFDA4E60000-0x00007FFDA5921000-memory.dmp
memory/3920-11-0x000000001BCB0000-0x000000001BCC0000-memory.dmp
memory/3920-12-0x000000001CB30000-0x000000001CB80000-memory.dmp
memory/3920-13-0x000000001CC40000-0x000000001CCF2000-memory.dmp
memory/3920-14-0x00007FFDA4E60000-0x00007FFDA5921000-memory.dmp
memory/3920-15-0x000000001BCB0000-0x000000001BCC0000-memory.dmp
memory/4724-0-0x00000000004D0000-0x00000000007F4000-memory.dmp
memory/4724-1-0x00007FFDA4E60000-0x00007FFDA5921000-memory.dmp
memory/4724-2-0x000000001B5A0000-0x000000001B5B0000-memory.dmp
memory/4724-9-0x00007FFDA4E60000-0x00007FFDA5921000-memory.dmp