Analysis
- max time kernel
149s - max time network
100s - platform
windows11-21h2_x64 - resource
win11-20260513-en - resource tags
- submitted
04/06/2026, 12:19
General
- Target Firefox%20Installer.exe
- Size 492KB
- Sample260604-phmb5sft3r
- SHA256 d958c47f03e7c857b5c69ca3b2503e197f219e43f848a776e8c9966837ab063c
Score
5/10
Malware Config
Signatures
- UPX packed file 2 IoCs
Detects executables packed with UPX/modified UPX open source packer.
- Drops file in Program Files directory 6 IoCs
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 7 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- 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.
- Suspicious use of SetWindowsHookEx 2 IoCs
- Suspicious use of WriteProcessMemory 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Firefox%20Installer.exe"C:\Users\Admin\AppData\Local\Temp\Firefox%20Installer.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\7zSCAC56728\setup-stub.exe.\setup-stub.exe2⤵
- Drops file in Program Files directory
- Executes dropped EXE
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
setup-stub.exe
CityHash.dll
InetBgDL.dll
System.dll
UAC.dll
UserInfo.dll
WebBrowser.dll
profile_cleanup.html
profile_cleanup.js
stub_common.js
memory/3244-0-0x0000000000400000-0x0000000000446000-memory.dmp
memory/3244-62-0x0000000000400000-0x0000000000446000-memory.dmp