Overview

overview

10

Static

static

10

2026-10-28...ry.exe

windows10-2004-x64

10

2026-10-28...ry.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260911-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    29/10/2026, 21:49

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General

  • Target
    2026-10-28_a5912569cb0eea742f68d1c7b45c9d96_amadey_cobalt-strike_elex_hijackloader_vidar_wannacry.exe
  • Size 1.2MB
  • Sample261029-1pvsmsce77
  • SHA256 460e9a52c8ef357721e86d464e1a7316b58ecf7a6c961dd4b205e7954c35cfb0
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
discoveryfesberpersistenceupxworm

Malware Config

Signatures

  • Family: Fesber

    Fesber is a Windows worm written in Delphi.

    wormfesber
  • Detects Fesber payload 5 IoCs
  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
    persistence
  • Drops file in System32 directory 3 IoCs
  • UPX packed file 5 IoCs

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

    upx
  • Drops file in Program Files directory 64 IoCs
  • Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

    The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

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

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

    discovery

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-10-28_a5912569cb0eea742f68d1c7b45c9d96_amadey_cobalt-strike_elex_hijackloader_vidar_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-10-28_a5912569cb0eea742f68d1c7b45c9d96_amadey_cobalt-strike_elex_hijackloader_vidar_wannacry.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Reads the TCP/IP host and domain name from the registry
    • System Location Discovery: System Language Discovery
    PID:1328

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        7z.exe-
        • Path C:\Program Files\7-Zip\7z.exe-
        • Size 1.7MB
        • SHA256 e9a0a59444291a831b0ce5db179a68ec9ee6bd0a7dc24878eb6594e31ac89c07
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ImportRequest.exe-
        • Path C:\Users\Admin\Downloads\ImportRequest.exe-
        • Size 1.9MB
        • SHA256 41704acb204060b1cca86e9e66a56c75b5026792388bde86ea506c69a5d65bfe
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        fsb.tmp
        • Path C:\Windows\SysWOW64\fsb.tmp
        • Size 1.2MB
        • SHA256 460e9a52c8ef357721e86d464e1a7316b58ecf7a6c961dd4b205e7954c35cfb0
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1328-0-0x0000000000400000-0x000000000041E000-memory.dmp
        Download

        memory/1328-1115-0x0000000000400000-0x000000000041E000-memory.dmp
        Download