Analysis
- max time kernel
142s - max time network
148s - platform
windows10-2004_x64 - resource
win10v2004-20240802-en - resource tags
- submitted
05/09/2024, 01:40
General
- Target Client-built.exe
- Size 3.1MB
- Sample240905-b3rwga1alk
- SHA256 ecec93b66bb2bd734e2aad37087492d8ae8de1932fcb18455ebdac1db1c2d5b3
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
10.0.0.152:4782
-
37d1802d-fd03-42cd-94fd-db7524dcadb1
-
encryption_key
7518DA26A27264D10B2DF83F74DD673FF6B6944A
-
install_name
Client.exe
-
log_directory
Logs
-
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).
- 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 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
-
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⤵
- Scheduled Task/Job: Scheduled Task
-
-
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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
memory/2032-0-0x00007FFA91E33000-0x00007FFA91E35000-memory.dmp
memory/2032-1-0x0000000000B10000-0x0000000000E34000-memory.dmp
memory/2032-2-0x00007FFA91E30000-0x00007FFA928F1000-memory.dmp
memory/2032-10-0x00007FFA91E30000-0x00007FFA928F1000-memory.dmp
memory/5832-9-0x00007FFA91E30000-0x00007FFA928F1000-memory.dmp
memory/5832-11-0x00007FFA91E30000-0x00007FFA928F1000-memory.dmp
memory/5832-12-0x000000001BF90000-0x000000001BFE0000-memory.dmp
memory/5832-13-0x000000001C0A0000-0x000000001C152000-memory.dmp
memory/5832-14-0x00007FFA91E30000-0x00007FFA928F1000-memory.dmp