Analysis
- max time kernel
149s - max time network
132s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
05/11/2026, 13:08
General
- Target Client-built.exe
- Size 246KB
- Sample261105-qdf51azzay
- SHA256 722603f1b714c149a9989f116049768f8e4188b27acd446b388789e0a4135297
Malware Config
Signatures
- Family: Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 2 IoCs
- Adds Run key to start application 2 TTPs 2 IoCs
- Looks up external IP address via web service 1 TTPs 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- 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 8 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- System Location Discovery: System Language Discovery 1 TTPs 4 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Adds Run key to start application
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
-
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
Network
MITRE ATT&CK Enterprise v16
Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Replay Monitor
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Downloads
Client.exe
memory/304-9-0x0000000074640000-0x0000000074DFC000-memory.dmp
memory/304-1-0x0000000000BE0000-0x0000000000C24000-memory.dmp
memory/304-2-0x0000000005E10000-0x00000000063CA000-memory.dmp
memory/304-3-0x0000000005760000-0x00000000057F2000-memory.dmp
memory/304-4-0x0000000005850000-0x00000000058B6000-memory.dmp
memory/304-5-0x0000000074640000-0x0000000074DFC000-memory.dmp
memory/304-6-0x00000000065D0000-0x00000000065E2000-memory.dmp
memory/304-0-0x0000000074652000-0x0000000074653000-memory.dmp
memory/2420-8-0x0000000074640000-0x0000000074DFC000-memory.dmp
memory/2420-10-0x0000000074640000-0x0000000074DFC000-memory.dmp
memory/2420-15-0x00000000069B0000-0x00000000069BA000-memory.dmp
memory/2420-17-0x0000000074640000-0x0000000074DFC000-memory.dmp
memory/2420-18-0x0000000074640000-0x0000000074DFC000-memory.dmp
memory/3076-11-0x0000000074640000-0x0000000074DFC000-memory.dmp
memory/3076-12-0x0000000074640000-0x0000000074DFC000-memory.dmp
memory/3076-13-0x0000000074640000-0x0000000074DFC000-memory.dmp