Analysis

  • max time kernel
    149s
  • max time network
    147s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260618-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260618-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    28/06/2026, 08:32

General

  • Target
    SteamSetup.exe
  • Size 2.3MB
  • Sample260628-kfkcjsf19v
  • SHA256 7d3654531c32d941b8cae81c4137fc542172bfa9635f169cb392f245a0a12bcb
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Adds Run key to start application 2 TTPs 1 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 60 IoCs
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 8 IoCs
  • Access Token Manipulation: Create Process with Token 1 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies trusted root certificate store through registry 1 TTPs 2 IoCs

    A root certificate was added, modified, or removed in the trusted certificate store registry paths.

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies registry class 40 IoCs
  • Modifies system certificate store 2 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\SteamSetup.exe
    "C:\Users\Admin\AppData\Local\Temp\SteamSetup.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Program Files directory
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:5324
    • C:\Program Files (x86)\Steam\bin\steamservice.exe
      "C:\Program Files (x86)\Steam\bin\steamservice.exe" /Install
      2⤵
      • Drops file in Program Files directory
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      PID:4364
  • C:\Program Files (x86)\Steam\Steam.exe
    "C:\Program Files (x86)\Steam\steam.exe" -silent
    1⤵
    • Drops file in Program Files directory
    • Executes dropped EXE
    • Modifies trusted root certificate store through registry
    • System Location Discovery: System Language Discovery
    • Checks processor information in registry
    • Modifies system certificate store
    PID:4284
  • C:\Program Files (x86)\Common Files\Steam\steamservice.exe
    "C:\Program Files (x86)\Common Files\Steam\steamservice.exe" /RunAsService
    1⤵
    • Drops file in Program Files directory
    • Executes dropped EXE
    • Access Token Manipulation: Create Process with Token
    • System Location Discovery: System Language Discovery
    PID:6216
  • C:\Program Files (x86)\Steam\steam.exe
    "C:\Program Files (x86)\Steam\steam.exe"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:4156

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        service_log.txt

        • Path C:\Program Files (x86)\Common Files\Steam\service_log.txt
        • Size 597B
        • SHA256 1508bce7e54e7cf62efa9384b74a4960fa23f522af1505b50636bbf8c809190e
        • MD5 SHA1 SHA512 TLSH

        Steam.exe

        • Path C:\Program Files (x86)\Steam\Steam.exe
        • Size 4.2MB
        • SHA256 12222b0908eb69581985f7e04aa6240e928fb08aa5a3ec36acae3440633c9eb1
        • MD5 SHA1 SHA512 SSDEEP TLSH

        SteamService.exe

        • Path C:\Program Files (x86)\Steam\bin\SteamService.exe
        • Size 2.5MB
        • SHA256 ce177dc8cf42513ff819c7b8597c7be290f9e98632a34ecd868dc76003421f0d
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_brazilian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_brazilian.txt
        • Size 4KB
        • SHA256 0fcd7ae491b467858f2a8745c5ecdd55451399778c2119517ee686d1f264b544
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_bulgarian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_bulgarian.txt
        • Size 6KB
        • SHA256 76a6bd74194efd819d33802decdfddaae893069d7000e44944dda05022cfa6d9
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_czech.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_czech.txt
        • Size 4KB
        • SHA256 650a265dffdc5dc50200bb82d56f416a3a423eecc08c962cfd1ba2d40a1ff3f7
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_danish.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_danish.txt
        • Size 4KB
        • SHA256 fdf7b42b3b027a12e1b79cb10ab9e6e34c668b04eb9e8a907d8611ba46473115
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_dutch.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_dutch.txt
        • Size 4KB
        • SHA256 56c8a86fa95eab0d8f34f498e079b5516b96d2a2f1ad9c2a888555e50e47f192
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_english.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_english.txt
        • Size 4KB
        • SHA256 ebececd3f691ac20e5b73e5c81861a01531203df3cf2baa9e1b6d004733a42a6
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_finnish.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_finnish.txt
        • Size 4KB
        • SHA256 8ff0f3cbdf28102ff037b9cda90590e4b66e1e654b90f9aea2cd5364494d02b7
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_french.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_french.txt
        • Size 4KB
        • SHA256 a1f6ba57ee41e009d904905c0ce5e75a59ee6790e08542561303109e1faafa13
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_german.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_german.txt
        • Size 4KB
        • SHA256 0828572e4fa00c186dbf1d9072a6154d65cb499c6a37e338f3305f77a2fee382
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_greek.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_greek.txt
        • Size 6KB
        • SHA256 c0a7a1df442ac080668762df795c72aa322e9d415c41bd0a4c676a4dc0551695
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_hungarian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_hungarian.txt
        • Size 4KB
        • SHA256 1f45bb7bdfa01424f9237eec60eba35dc7f0dc4e8c2e193fe768fe96d3ff76d5
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_indonesian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_indonesian.txt
        • Size 4KB
        • SHA256 3b3c5c615fd82070cc951ab482d3de8cb12df0b3df59fbd11f9d3271fa2fbca4
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_italian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_italian.txt
        • Size 4KB
        • SHA256 b01ec64d75fd1fbd00fbeb45a3fb39244911a8b22bb43de4e0c03f205184f585
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_japanese.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_japanese.txt
        • Size 5KB
        • SHA256 fc74e26a8baabbe4851109512d85173b75dbf7293d41eb3b92a1957a773c8265
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_korean.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_korean.txt
        • Size 4KB
        • SHA256 3d1399f5323a3ece1b1a8b3b31f8fd7f50c3bd319ab3f1c38c6e347452c95314
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_latam.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_latam.txt
        • Size 4KB
        • SHA256 05bc1f4973c6d36002ac1b37ce46b1f941fcb4338282e0ec1ec83fb558d1a88c
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_norwegian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_norwegian.txt
        • Size 4KB
        • SHA256 c084a68b65d507eb831831aa2ab9afb9536cb99a840d248cc155ff87fad18425
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_polish.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_polish.txt
        • Size 4KB
        • SHA256 0bdeee9fa28d54d384e06ea646fbcfe3f06698a31dfdc1a50703ffe83ad78d32
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_portuguese.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_portuguese.txt
        • Size 4KB
        • SHA256 2ed2b0d654d60e0a82b0968a91d568b775144e9d92f2b077b6da75f85ad12d04
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_romanian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_romanian.txt
        • Size 4KB
        • SHA256 f8d1972e75a320344e3c834ba0a3a6a86edb39e20ef706bda9b7965d440d1998
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_russian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_russian.txt
        • Size 6KB
        • SHA256 08c775efa77c2a92d369f794882e467b6e2526e61bc7aa7724f48e174524502e
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_schinese.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_schinese.txt
        • Size 4KB
        • SHA256 948cad1bb27109e008f2457248880c759d3fa98b92c5b4033b94f455cb8ac43f
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_spanish.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_spanish.txt
        • Size 4KB
        • SHA256 c4f821a4903c4e7faea2931c7fb1cf261eba06a9840c78fdca689f5c784c06c4
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_swedish.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_swedish.txt
        • Size 4KB
        • SHA256 4bf6b25bf5b18e13b04db6ed2e5ed635eb844fc52baa892f530194d9471f5690
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_tchinese.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_tchinese.txt
        • Size 4KB
        • SHA256 5e4f2de5ee98d5d76f5d76fb925417d6668fba08e89f7240f923f3378e3e66f6
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_thai.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_thai.txt
        • Size 7KB
        • SHA256 488294b7faff720dc3ab5a72e0607761484c678b96d6bcd6aad9ee2388356a83
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_turkish.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_turkish.txt
        • Size 4KB
        • SHA256 711675edb20b3cb70acf6cf75f2eea8e0d87c8ace3e11c8df362b4517427a34f
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_ukrainian.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_ukrainian.txt
        • Size 6KB
        • SHA256 3dd0edfbe68236e668fb308f92fe7c6493dbb05bfca85a48de93588f479ccc99
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steambootstrapper_vietnamese.txt

        • Path C:\Program Files (x86)\Steam\public\steambootstrapper_vietnamese.txt
        • Size 4KB
        • SHA256 15b6a564e05857a3d2fd6eec85a5a30c491a7553d15ffc025156b3665b919185
        • MD5 SHA1 SHA512 SSDEEP TLSH

        StdUtils.dll

        • Path C:\Users\Admin\AppData\Local\Temp\nsdBEC9.tmp\StdUtils.dll
        • Size 110KB
        • SHA256 c602c44a4d4088dbf5a659f36ba1c3a9d81f8367577de0cb940c0b8afee5c376
        • MD5 SHA1 SHA512 SSDEEP TLSH

        System.dll

        • Path C:\Users\Admin\AppData\Local\Temp\nsdBEC9.tmp\System.dll
        • Size 22KB
        • SHA256 fa367ae36bfbe7c989c24c7abbb13482fc20bc35e7812dc377aa1c281ee14cc0
        • MD5 SHA1 SHA512 SSDEEP TLSH

        modern-wizard.bmp

        • Path C:\Users\Admin\AppData\Local\Temp\nsdBEC9.tmp\modern-wizard.bmp
        • Size 150KB
        • SHA256 16e0edc9f47e6e95a9bcad15adbdc46be774fbcd045dd526fc16fc38fdc8d49b
        • MD5 SHA1 SHA512 SSDEEP TLSH

        nsDialogs.dll

        • Path C:\Users\Admin\AppData\Local\Temp\nsdBEC9.tmp\nsDialogs.dll
        • Size 20KB
        • SHA256 91a484dc79be64dd11bf5acb62c893e57505fcd8809483aa92b04f10d81f9de0
        • MD5 SHA1 SHA512 SSDEEP TLSH

        nsExec.dll

        • Path C:\Users\Admin\AppData\Local\Temp\nsdBEC9.tmp\nsExec.dll
        • Size 17KB
        • SHA256 3e2399ae5ce16dd69f7e2c71d928cf54a1024afced8155f1fd663a3e123d9226
        • MD5 SHA1 SHA512 SSDEEP TLSH

        nsProcess.dll

        • Path C:\Users\Admin\AppData\Local\Temp\nsdBEC9.tmp\nsProcess.dll
        • Size 15KB
        • SHA256 bb6ce83ddaad4f530a66a1048fac868dfc3b86f5e7b8e240d84d1633e385aee8
        • MD5 SHA1 SHA512 SSDEEP TLSH