Resubmissions

25-02-2022 16:28

220225-tysw3shhhm 8

19-05-2021 13:45

210519-8m9k3t3eza 8

Analysis

  • max time kernel
    145s
  • max time network
    163s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    19-05-2021 13:45

General

  • Target

    sample.exe

  • Size

    179KB

  • MD5

    61fccc142e2bbf498885bb6e42bae62c

  • SHA1

    7f15507c7798d8b99696c19929c86c6c629eb2f5

  • SHA256

    ae91da58a702252cc0dabcf19fa65e9655c7b7143e71e048aad1ebe59a31aabf

  • SHA512

    a3cc95a442581d02c97d4fe48494b157f37e5dff4ddf175723a2c99e442492370ad65f9f22da29ffd020754445193215b7dadc3515ab8cee91b6dd3b1f1202b1

Malware Config

Signatures

  • Modifies extensions of user files 5 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of SetWindowsHookEx 6 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\sample.exe
    "C:\Users\Admin\AppData\Local\Temp\sample.exe"
    1⤵
    • Modifies extensions of user files
    • Drops file in Program Files directory
    • Modifies Internet Explorer settings
    • Suspicious use of SetWindowsHookEx
    PID:1660
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1716
  • C:\Windows\system32\AUDIODG.EXE
    C:\Windows\system32\AUDIODG.EXE 0xc8
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1672
  • C:\Windows\system32\rundll32.exe
    "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\Desktop\SuspendWatch.pps.matryoshka
    1⤵
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1280
    • C:\Windows\system32\NOTEPAD.EXE
      "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\SuspendWatch.pps.matryoshka
      2⤵
      • Opens file in notepad (likely ransom note)
      PID:1600

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\Desktop\SuspendWatch.pps.matryoshka

    MD5

    4e6561070bf2bec2037507f419a8718f

    SHA1

    99d8d6ef2e8a4badf39101f6434f633a9290d52a

    SHA256

    8ccefd60ad2e7588d9472156786dee2adcd5550cd72af2fec37ed14a0b9b3082

    SHA512

    702dd72420fdebf95be21f67cc93650ae121594ba399d3ad79100226d39e10606e639e76c6c0dfed2f8db44841e0d0960b8f6b56cb9ec41d92df0f6af4455993

  • memory/1280-68-0x000007FEFC4A1000-0x000007FEFC4A3000-memory.dmp

    Filesize

    8KB

  • memory/1600-69-0x0000000000000000-mapping.dmp

  • memory/1660-60-0x0000000000A90000-0x0000000000A91000-memory.dmp

    Filesize

    4KB

  • memory/1660-62-0x000000001B100000-0x000000001B102000-memory.dmp

    Filesize

    8KB

  • memory/1660-63-0x000000001B106000-0x000000001B125000-memory.dmp

    Filesize

    124KB

  • memory/1660-64-0x000000001B125000-0x000000001B126000-memory.dmp

    Filesize

    4KB

  • memory/1660-65-0x000000001B126000-0x000000001B127000-memory.dmp

    Filesize

    4KB

  • memory/1660-66-0x0000000024C50000-0x0000000024C51000-memory.dmp

    Filesize

    4KB

  • memory/1660-67-0x000000001B127000-0x000000001B128000-memory.dmp

    Filesize

    4KB