Analysis
- user interaction
yes - max time kernel
118s - max time network
115s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
28/07/2026, 09:08
General
- Target reFX - Nexus v4.5.4/reFX Nexus v4.5.4 CE.exe
- Size 14.8MB
- Sample260728-k4as1staph
- SHA256 4f405b6012422e227aba366494a8bf12bc6460b4246b2176ea0e850f188220c8
Malware Config
Signatures
- Executes dropped EXE 3 IoCs
- Loads dropped DLL 3 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Drops file in Program Files directory 5 IoCs
- Detects Pyinstaller 1 IoCs
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Inno Setup is an open-source installation builder for Windows applications. 3 IoCs
Inno Setup installer
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\reFX - Nexus v4.5.4\reFX Nexus v4.5.4 CE.exe"C:\Users\Admin\AppData\Local\Temp\reFX - Nexus v4.5.4\reFX Nexus v4.5.4 CE.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\is-6IGKK.tmp\reFX Nexus v4.5.4 CE.tmp"C:\Users\Admin\AppData\Local\Temp\is-6IGKK.tmp\reFX Nexus v4.5.4 CE.tmp" /SL5="$400CA,14571176,791040,C:\Users\Admin\AppData\Local\Temp\reFX - Nexus v4.5.4\reFX Nexus v4.5.4 CE.exe"2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
-
C:\Users\Public\Documents\reFX\NEXUS library\update_nexus_library_location.exe"C:\Users\Public\Documents\reFX\NEXUS library\update_nexus_library_location.exe"3⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
-
C:\Users\Public\Documents\reFX\NEXUS library\update_nexus_library_location.exe"C:\Users\Public\Documents\reFX\NEXUS library\update_nexus_library_location.exe"4⤵
- Executes dropped EXE
- Loads dropped DLL
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Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
VCRUNTIME140.dll
base_library.zip
python310.dll
ucrtbase.dll
reFX Nexus v4.5.4 CE.tmp
update_nexus_library_location.exe
settings.json
memory/3228-8-0x0000000000400000-0x00000000004CE000-memory.dmp
memory/3228-0-0x0000000000400000-0x00000000004CE000-memory.dmp
memory/3228-486-0x0000000000400000-0x00000000004CE000-memory.dmp
memory/3536-12-0x0000000000400000-0x0000000000707000-memory.dmp
memory/3536-10-0x00000000024F0000-0x00000000024F1000-memory.dmp
memory/3536-9-0x0000000000400000-0x0000000000707000-memory.dmp
memory/3536-6-0x00000000024F0000-0x00000000024F1000-memory.dmp
memory/3536-485-0x0000000000400000-0x0000000000707000-memory.dmp