Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260130-en
  • resource tags

    arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    24/04/2026, 04:35

General

  • Target
    2026-04-24_9d79b5bec9215d8564a71f76a4d39070_amadey_cobalt-strike_elex_hijackloader_icedid_luca-stealer_njrat_vidar.exe
  • Size 4.6MB
  • Sample260424-e7y25aez8w
  • SHA256 d8341655cd62b5add904648883e06a35d701b3a20ec4e95a67b03a6068cc3b7e
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: Fesber

    Fesber is a Windows worm written in Delphi.

  • Detects Fesber payload 11 IoCs
  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Drops file in System32 directory 3 IoCs
  • UPX packed file 1 IoCs

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

  • Drops file in Program Files directory 64 IoCs
  • 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.

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-04-24_9d79b5bec9215d8564a71f76a4d39070_amadey_cobalt-strike_elex_hijackloader_icedid_luca-stealer_njrat_vidar.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-04-24_9d79b5bec9215d8564a71f76a4d39070_amadey_cobalt-strike_elex_hijackloader_icedid_luca-stealer_njrat_vidar.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    PID:1544

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        7z.exe

        • Path C:\Program Files\7-Zip\7z.exe
        • Size 5.2MB
        • SHA256 cdb8e27afe6d1017ba528833f5db894cf19035c5ced78dd0291d1f82329960a5
        • MD5 SHA1 SHA512 SSDEEP TLSH

        fsb.tmp

        • Path C:\Windows\SysWOW64\fsb.tmp
        • Size 4.6MB
        • SHA256 d8341655cd62b5add904648883e06a35d701b3a20ec4e95a67b03a6068cc3b7e
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/1544-1195-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/1544-1196-0x00000000006D0000-0x0000000000734000-memory.dmp

        memory/1544-2072-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/1544-2183-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/1544-2185-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/1544-2187-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/1544-2189-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/1544-2195-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/1544-2203-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/1544-2205-0x0000000000400000-0x000000000041B000-memory.dmp