Analysis
- max time kernel
148s - max time network
151s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
20/10/2026, 05:15
General
- Target Client-built.exe
- Size 3.1MB
- Sample261020-fxwppaad42
- SHA256 fd75fd223b0291a534069054b5f879cf43b7d4663fd4832c35e38a643da5cf89
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
f98.to:443
-
www.f98.to:443
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f98.to:80
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www.f98.to:80
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45bfa86f-6e39-4441-a0e9-17063ee59add
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encryption_key
ED3227F773701D05083B11A65776F95F93EEEF5E
-
install_name
Client.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
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- 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
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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
-
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeC:\Users\Admin\AppData\Roaming\SubDir\Client.exe1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- 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
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
Client.exe
memory/2764-25-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/2764-20-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/2764-21-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/2764-19-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/2764-18-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/2764-16-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-6-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-17-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-9-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-10-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-11-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-12-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-13-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-14-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-7-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-8-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-0-0x00007FFF4F29F000-0x00007FFF4F2A0000-memory.dmp
memory/5212-5-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-4-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-3-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-2-0x00007FFF4F110000-0x00007FFF4FAB4000-memory.dmp
memory/5212-1-0x0000000000A70000-0x0000000000D94000-memory.dmp
memory/5900-23-0x000000001CB80000-0x000000001CBD0000-memory.dmp
memory/5900-24-0x000000001CC90000-0x000000001CD42000-memory.dmp