Analysis
- user interaction
yes - max time kernel
149s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260710-en - resource tags
- submitted
21/07/2026, 11:15
General
- Target Client-built.exe
- Size 3.1MB
- Sample260721-nclyrafv91
- SHA256 0fddd78ae7cc3240e3fb32c049a8c1517eb697511ee8bc9d61dbe8aebbd4b730
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
35.tcp.cpolar.top:12362
-
ac830850-1b16-4107-89e0-2d466f8ccef6
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encryption_key
131C7C0799DE8C17EC550975525F96E02E64F502
-
install_name
Windows.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
9000
-
startup_key
Steam 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 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 "Steam Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Windows.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
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C:\Windows\system32\SubDir\Windows.exe"C:\Windows\system32\SubDir\Windows.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 WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Steam Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Windows.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
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C:\Windows\system32\SubDir\Windows.exeC:\Windows\system32\SubDir\Windows.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Windows.exe
memory/5772-30-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5772-28-0x000000001CE90000-0x000000001CEA2000-memory.dmp
memory/5772-29-0x000000001CEF0000-0x000000001CF2C000-memory.dmp
memory/5772-25-0x000000001CF30000-0x000000001CFE2000-memory.dmp
memory/5772-24-0x000000001CE20000-0x000000001CE70000-memory.dmp
memory/5772-22-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5772-21-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5772-17-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5772-20-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5772-19-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5772-16-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-7-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-9-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-14-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-12-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-11-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-18-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-10-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-13-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-8-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-0-0x00007FFD0856F000-0x00007FFD08570000-memory.dmp
memory/5832-6-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-5-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-4-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-3-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-2-0x00007FFD083E0000-0x00007FFD08D84000-memory.dmp
memory/5832-1-0x0000000000700000-0x0000000000A24000-memory.dmp