Analysis
- max time kernel
150s - max time network
152s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
06/08/2026, 02:52
General
- Target Client-built.exe
- Size 3.1MB
- Sample260806-dc8gmsfd97
- SHA256 584c9def9725a97449d2e11b04c3cdc5c9343cecfd5e74eeaaf943ed169e4957
Malware Config
Extracted
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quasar
-
1.4.1
-
Office04
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77bd.cc:443
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www.77bd.cc:443
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77bd.cc:80
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www.77bd.cc:80
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59a6bcf9-b424-40bf-bde8-960b08fe1306
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encryption_key
ED3227F773701D05083B11A65776F95F93EEEF5E
-
install_name
Client.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
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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
- 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⤵
- 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\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
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-
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 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 /f3⤵
- Scheduled Task/Job: Scheduled Task
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-
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeC:\Users\Admin\AppData\Roaming\SubDir\Client.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Client.exe
memory/908-8-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-10-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-3-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-4-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-5-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-6-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-2-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-7-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-9-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-24-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-11-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-12-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-13-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-14-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/908-0-0x00007FFB195CF000-0x00007FFB195D0000-memory.dmp
memory/908-1-0x00000000008A0000-0x0000000000BC4000-memory.dmp
memory/2448-16-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-18-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-19-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-20-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-21-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-22-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-17-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-23-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-25-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-26-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-27-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-28-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-29-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-31-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp
memory/2448-32-0x000000001CFE0000-0x000000001D030000-memory.dmp
memory/2448-33-0x000000001D0F0000-0x000000001D1A2000-memory.dmp
memory/2448-34-0x00007FFB19440000-0x00007FFB19DE4000-memory.dmp