Analysis
- max time kernel
78s - max time network
79s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
22/03/2024, 20:51
General
- Target Client-built.exe
- Size 3.1MB
- Sample240322-znjhjsbd2s
- SHA256 cd2205c1639fc7c3c2a0bc9daea86e11e7bece97a2eaecc7bfa401098f298f55
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
140.238.91.110:41973
-
7cdfecd4-9eea-47bd-9b07-1e1993a73faf
-
encryption_key
8B5D3A99FA77DE061652B0F00AE61CD23BB12B7C
-
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 3 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 4 IoCs
- Suspicious use of SendNotifyMessage 4 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
-
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
Client.exe
memory/2036-10-0x00007FF8665B0000-0x00007FF867071000-memory.dmp
memory/2036-2-0x000000001BDD0000-0x000000001BDE0000-memory.dmp
memory/2036-1-0x00007FF8665B0000-0x00007FF867071000-memory.dmp
memory/2036-0-0x0000000000B20000-0x0000000000E44000-memory.dmp
memory/3684-9-0x00007FF8665B0000-0x00007FF867071000-memory.dmp
memory/3684-11-0x000000001B540000-0x000000001B550000-memory.dmp
memory/3684-12-0x000000001C340000-0x000000001C390000-memory.dmp
memory/3684-13-0x000000001C450000-0x000000001C502000-memory.dmp
memory/3684-17-0x000000001CF50000-0x000000001CF8C000-memory.dmp
memory/3684-16-0x000000001C3C0000-0x000000001C3D2000-memory.dmp
memory/3684-18-0x00007FF8665B0000-0x00007FF867071000-memory.dmp
memory/3684-19-0x000000001B540000-0x000000001B550000-memory.dmp