Analysis

  • max time kernel
    900s
  • max time network
    440s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    02/08/2026, 16:43

General

  • Target
    Steam.exe
  • Size 4.2MB
  • Sample260802-t8a41sxane
  • SHA256 12222b0908eb69581985f7e04aa6240e928fb08aa5a3ec36acae3440633c9eb1
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • 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 3 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 system certificate store 2 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: RenamesItself 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Steam.exe
    "C:\Users\Admin\AppData\Local\Temp\Steam.exe"
    1⤵
    • Modifies trusted root certificate store through registry
    • System Location Discovery: System Language Discovery
    • Checks processor information in registry
    • Modifies system certificate store
    • Suspicious behavior: RenamesItself
    • Suspicious use of WriteProcessMemory
    PID:2496
    • C:\Users\Admin\AppData\Local\Temp\Steam.exe
      C:\Users\Admin\AppData\Local\Temp\Steam.exe
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:7120
      • C:\Users\Admin\AppData\Local\Temp\steamerrorreporter.exe
        C:\Users\Admin\AppData\Local\Temp\ste
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        PID:4908

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        F15827BEC5BABE89C21DCDAE77464BF1

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\F15827BEC5BABE89C21DCDAE77464BF1
        • Size 701B
        • SHA256 108dd34232a3088b45534933d0486409616a2bbad94fd8f7ab5991c01ff179b6
        • MD5 SHA1 SHA512 TLSH

        F15827BEC5BABE89C21DCDAE77464BF1

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\F15827BEC5BABE89C21DCDAE77464BF1
        • Size 192B
        • SHA256 7a4853aca6b5bf11653fe30430abaeeaffd93f2f7785e0b16e02a7c05dc6cb74
        • MD5 SHA1 SHA512 TLSH

        crashhandler.dll

        • Path C:\Users\Admin\AppData\Local\Temp\crashhandler.dll
        • Size 381KB
        • SHA256 e90218de2e066babb8220e61c787eb75a7c037ab65e7d44d0241264e2952879a
        • MD5 SHA1 SHA512 SSDEEP TLSH

        bootstrap_log.txt

        • Path C:\Users\Admin\AppData\Local\Temp\logs\bootstrap_log.txt
        • Size 13KB
        • SHA256 c085f9782bc84517881d02f761cb1f8a7893680c2397782fad43080b7106e61c
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steam_client_metrics.bin

        • Path C:\Users\Admin\AppData\Local\Temp\package\steam_client_metrics.bin
        • Size 3KB
        • SHA256 9d9407cdebff62a1624d1556f3d18749f22555c31bc4e8247deea1f59cbecb2b
        • MD5 SHA1 SHA512 TLSH
        • Path C:\Users\Admin\AppData\Local\Temp\package\tmp\graphics\[email protected]_
        • Size 15KB
        • SHA256 983aa3928f15f5154266be7063a75e1fce87238bbe81a910219dea01d5376824
        • MD5 SHA1 SHA512 SSDEEP TLSH

        icon_button_news_mousedown.tga_

        • Path C:\Users\Admin\AppData\Local\Temp\package\tmp\graphics\icon_button_news_mousedown.tga_
        • Size 20KB
        • SHA256 cab3a68b64d8bf22c44080f12d7eab5b281102a8761f804224074ab1f6130fe2
        • MD5 SHA1 SHA512 SSDEEP TLSH

        filter_clean_bulgarian.txt.gz_

        • Path C:\Users\Admin\AppData\Local\Temp\package\tmp\resource\filter_clean_bulgarian.txt.gz_
        • Size 23B
        • SHA256 6feb83ca306745d634903cf09274b7baf0ac38e43c6b3fab1a608be344c3ef64
        • MD5 SHA1 SHA512

        steambootstrapper_english.txt

        • Path C:\Users\Admin\AppData\Local\Temp\public\steambootstrapper_english.txt
        • Size 4KB
        • SHA256 fbc09c1b9a55d04b57be8fb2ad5ab58b38f76054ecd3d1b70440a2d08191b05b
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steam.exe

        • Path C:\Users\Admin\AppData\Local\Temp\steam.exe
        • Size 4.5MB
        • SHA256 1d2fbcc0402dc5a1f64b2e1d924e6e38e1dd76197c0246ddf89094fb86fda915
        • MD5 SHA1 SHA512 SSDEEP TLSH

        steamerrorreporter.exe

        • Path C:\Users\Admin\AppData\Local\Temp\steamerrorreporter.exe
        • Size 671KB
        • SHA256 55090921c58be9dd0237e04262009022fbd4758173253675695ac06609dcd68b
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/2496-6334-0x00000000009A0000-0x0000000000E52000-memory.dmp