Analysis
- user interaction
yes - max time kernel
148s - max time network
148s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
17/10/2026, 07:48
General
- Target Client-built.exe
- Size 3.4MB
- Sample261017-jnellavy7q
- SHA256 f5d5d3e747080356de7bb3b5a57cf1c495f1f93208a0d5bfdaca7af03c877c91
Malware Config
Extracted
-
quasar
-
1.4.1
-
byeongsinsaekki
-
211.193.49.225:8787
-
6f2489a8-0d9e-4c31-88af-216c9400b29a
-
encryption_key
1A0AB47605F23B139B44114112736B139C00A2E6
-
install_name
Extern.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Roblox
-
subdirectory
KernelDriver
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 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 3 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 "Roblox" /sc ONLOGON /tr "C:\Windows\system32\KernelDriver\Extern.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Windows\system32\KernelDriver\Extern.exe"C:\Windows\system32\KernelDriver\Extern.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Roblox" /sc ONLOGON /tr "C:\Windows\system32\KernelDriver\Extern.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
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C:\Windows\system32\KernelDriver\Extern.exeC:\Windows\system32\KernelDriver\Extern.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k GPSvcGroup1⤵
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
Extern.exe
memory/1672-6-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-2-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-3-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-4-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-5-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-0-0x00007FF81275F000-0x00007FF812760000-memory.dmp
memory/1672-7-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-8-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-9-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-10-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-12-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/1672-1-0x0000000000C40000-0x0000000000FA2000-memory.dmp
memory/1672-13-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-16-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-23-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-14-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-18-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-17-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-19-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-20-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-21-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-22-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-15-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-24-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-25-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-26-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-28-0x0000000002980000-0x00000000029D0000-memory.dmp
memory/5496-29-0x000000001C8A0000-0x000000001C952000-memory.dmp
memory/5496-33-0x000000001C840000-0x000000001C87C000-memory.dmp
memory/5496-32-0x000000001C7E0000-0x000000001C7F2000-memory.dmp
memory/5496-34-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-35-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp
memory/5496-36-0x00007FF8125D0000-0x00007FF812F74000-memory.dmp