Analysis
- max time kernel
1793s - max time network
1797s - platform
windows10-2004_x64 - resource
win10v2004-20240802-en - resource tags
- submitted
12/08/2024, 18:45
General
- Target Quasar client setup.exe
- Size 3.1MB
- Sample240812-xefzystgrq
- SHA256 045771c65cab4a100f0c0e22ab978ff42a10aa0501d34277769c1be35b29863d
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
192.168.0.24:4782
-
a87c5c38-db2d-4776-a9ef-1f0455207a76
-
encryption_key
B6452E46958E0B275D371BB38DBA95B4A769F6E0
-
install_name
Quasar startup.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
stubdir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- 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 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
-
C:\Users\Admin\AppData\Local\Temp\Quasar client setup.exe"C:\Users\Admin\AppData\Local\Temp\Quasar client setup.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\stubdir\Quasar startup.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Roaming\stubdir\Quasar startup.exe"C:\Users\Admin\AppData\Roaming\stubdir\Quasar startup.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- 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\stubdir\Quasar startup.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Quasar startup.exe
memory/556-10-0x00007FF960200000-0x00007FF960CC1000-memory.dmp
memory/556-11-0x00007FF960200000-0x00007FF960CC1000-memory.dmp
memory/556-12-0x000000001BD30000-0x000000001BD80000-memory.dmp
memory/556-13-0x000000001BE40000-0x000000001BEF2000-memory.dmp
memory/556-14-0x00007FF960200000-0x00007FF960CC1000-memory.dmp
memory/556-15-0x00007FF960200000-0x00007FF960CC1000-memory.dmp
memory/3048-0-0x00007FF960203000-0x00007FF960205000-memory.dmp
memory/3048-1-0x0000000000D20000-0x0000000001044000-memory.dmp
memory/3048-2-0x00007FF960200000-0x00007FF960CC1000-memory.dmp
memory/3048-9-0x00007FF960200000-0x00007FF960CC1000-memory.dmp