Overview

overview

5

Static

static

5

Firefox Installer.exe

windows10-2004-x64

5

Firefox Installer.exe

windows11-ltsc_2024-x64

5

Analysis

  • max time kernel
    148s
  • max time network
    148s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    09/08/2026, 12:11

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General

  • Target
    Firefox Installer.exe
  • Size 492KB
  • Sample260809-pcpv3sac86
  • SHA256 efb84424238ec9f5ee4db06064d64a8d23593df0a399e361dfb3535a4d43a680
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
5/10
discoveryspywarestealerupx

Malware Config

Signatures

  • UPX packed file 2 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

    upx
  • 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.

    spywarestealer
  • 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.

    discovery
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Firefox Installer.exe
    "C:\Users\Admin\AppData\Local\Temp\Firefox Installer.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4540
    • C:\Users\Admin\AppData\Local\Temp\7zSCB17ED09\setup-stub.exe
      .\setup-stub.exe
      2⤵
      • Drops file in Program Files directory
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of SetWindowsHookEx
      PID:4244

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        setup-stub.exe
        • Path C:\Users\Admin\AppData\Local\Temp\7zSCB17ED09\setup-stub.exe
        • Size 833KB
        • SHA256 4f092f86b0a3b1f23cc89ce87d42d9cafe34955e41c14069a5acd9b6a85ff1f9
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        CityHash.dll
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\CityHash.dll
        • Size 53KB
        • SHA256 c299a0a71bf57eb241868158b4fcfe839d15d5ba607e1bdc5499fdf67b334a14
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        InetBgDL.dll
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\InetBgDL.dll
        • Size 95KB
        • SHA256 3921dec014fadd1de7f3a36606ac95882a17cb96df38a5424e58531a169f825b
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        System.dll
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\System.dll
        • Size 22KB
        • SHA256 b711c4f17690421c9dc8ddb9ed5a9ddc539b3a28f11e19c851e25dcfc7701c04
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        UAC.dll
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\UAC.dll
        • Size 28KB
        • SHA256 ec6a56d981892bf251df1439bea425a5f6c7e1c7312d44bedd5e2957f270338c
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        UserInfo.dll
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\UserInfo.dll
        • Size 14KB
        • SHA256 c6c413108539f141bea3f679e0e2ef705898c51ec7c2607f478a865fc5e2e2df
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        WebBrowser.dll
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\WebBrowser.dll
        • Size 103KB
        • SHA256 281a0dc8b4f644334c2283897963b20df88fa9fd32acca98ed2856b23318e6ec
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        bgstub.jpg
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\bgstub.jpg
        • Size 194KB
        • SHA256 5992f5deb915c3d80a1b514fac24a5031e888538dd53434137b40e453c794249
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        profile_cleanup.html
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\profile_cleanup.html
        • Size 1021B
        • SHA256 841c48b6725f700e10f2ee93bfe2824d630118eb98a61673485acf4e2e75587c
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        profile_cleanup.js
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\profile_cleanup.js
        • Size 1KB
        • SHA256 a58e277ede06cc98d00e34c9f9ae57908c49bd45f9f5ff99a395ae6f4c7be6a7
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        profile_cleanup_page.css
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\profile_cleanup_page.css
        • Size 606B
        • SHA256 1579a832e7e24e1afb415db6f5a42b6dbfddcab01aae077eee5e1083dced46bf
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        stub_common.css
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\stub_common.css
        • Size 678B
        • SHA256 d86446129e0c9aee0288a4c9f465bb7c7593f81866110f6393673bce06d67eaf
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        stub_common.js
        • Path C:\Users\Admin\AppData\Local\Temp\nsx487A.tmp\stub_common.js
        • Size 584B
        • SHA256 7da3182de713cdbfa901bf71ecbc517a3ff9dd53dfdf9b03ab01a19a899818d5
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        memory/4540-0-0x0000000000400000-0x0000000000446000-memory.dmp
        Download

        memory/4540-87-0x0000000000400000-0x0000000000446000-memory.dmp
        Download