Analysis
- user interaction
yes - max time kernel
82s - max time network
82s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
- submitted
30/07/2026, 16:17
General
- Target Client-built.exe
- Size 3.1MB
- Sample260730-trkbcsvzb1
- SHA256 f22cc2c2e04f49a90ee29885257be3c186e278fb7da14cfaaf79454ea71296df
Malware Config
Extracted
-
quasar
-
1.4.1
-
$
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110.137.39.220:4782
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ece4c0a8-6feb-4bdc-b69c-1c448be6d57a
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encryption_key
B427E2CEED7979297274B02E66ADE25DA1BF2278
-
install_name
$$$.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Family: Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 2 IoCs
- Drops file in System32 directory 5 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\$$$.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
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C:\Windows\system32\SubDir\$$$.exe"C:\Windows\system32\SubDir\$$$.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- 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:\Windows\system32\SubDir\$$$.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
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C:\Windows\system32\SubDir\$$$.exeC:\Windows\system32\SubDir\$$$.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
$$$.exe
memory/1032-9-0x00007FFAEBD60000-0x00007FFAEBDFD000-memory.dmp
memory/1032-12-0x000000001CB50000-0x000000001CBA0000-memory.dmp
memory/1032-13-0x000000001CC60000-0x000000001CD12000-memory.dmp
memory/4692-0-0x0000000000130000-0x0000000000454000-memory.dmp
memory/4692-1-0x00007FFAEBD60000-0x00007FFAEBDFD000-memory.dmp
memory/4692-8-0x00007FFAEBD60000-0x00007FFAEBDFD000-memory.dmp