Overview

overview

10

Static

static

8

7b91993341...8b.exe

windows7_x64

10

7b91993341...8b.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    177s
  • max time network
    41s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    20-02-2022 05:26

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General

  • Target

    7b91993341995065df2a78819d0984fa7760c4bac8d50ad62d3150eeed2c3f8b.exe

  • Size

    71KB

  • MD5

    a2ea3c46d0a15c29fcd2000b1da24657

  • SHA1

    8682038788db406bc5328757541b9da69d9304ad

  • SHA256

    7b91993341995065df2a78819d0984fa7760c4bac8d50ad62d3150eeed2c3f8b

  • SHA512

    1f7d73101aed9d3c5b2e739944e4469957cb4a105f76e90ed4d77662e78e596af24562faf30e33ec7914563044268e86053ff215c03b787c0870a3ade1bf3b5e

Score
10/10
ryukpersistenceransomwareupx

Malware Config

Extracted

Path

C:\RyukReadMe.txt

Family

ryuk

Ransom Note
Your network has been penetrated. All files on each host in the network have been encrypted with a strong algorithm. Backups were either encrypted or deleted or backup disks were formatted. Shadow copies also removed, so F8 or any other methods may damage encrypted data but not recover. We exclusively have decryption software for your situation No decryption software is available in the public. DO NOT RESET OR SHUTDOWN - files may be damaged. DO NOT RENAME OR MOVE the encrypted and readme files. DO NOT DELETE readme files. This may lead to the impossibility of recovery of the certain files. To get info (decrypt your files) contact us at [email protected] or [email protected] BTC wallet: 14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk Ryuk No system is safe
Wallets

14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • UPX packed file 1 IoCs

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

    upx
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • 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.

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Windows\system32\taskhost.exe
    "taskhost.exe"
    1⤵
      PID:1248
    • C:\Windows\system32\Dwm.exe
      "C:\Windows\system32\Dwm.exe"
      1⤵
        PID:1356
      • C:\Users\Admin\AppData\Local\Temp\7b91993341995065df2a78819d0984fa7760c4bac8d50ad62d3150eeed2c3f8b.exe
        "C:\Users\Admin\AppData\Local\Temp\7b91993341995065df2a78819d0984fa7760c4bac8d50ad62d3150eeed2c3f8b.exe"
        1⤵
        • Drops file in Program Files directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:524
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\7b91993341995065df2a78819d0984fa7760c4bac8d50ad62d3150eeed2c3f8b.exe" /f /reg:64
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:1408
          • C:\Windows\SysWOW64\reg.exe
            REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\7b91993341995065df2a78819d0984fa7760c4bac8d50ad62d3150eeed2c3f8b.exe" /f /reg:64
            3⤵
            • Adds Run key to start application
            PID:1472
      • C:\Windows\system32\conhost.exe
        \??\C:\Windows\system32\conhost.exe "-290958772943336678-1867844682-11752895862081470860-7904130421886441925586735590"
        1⤵
          PID:616

        Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • memory/524-54-0x0000000074F01000-0x0000000074F03000-memory.dmp

          Filesize

          8KB

          Download

        • memory/1248-55-0x0000000030000000-0x0000000030385000-memory.dmp

          Filesize

          3.5MB

          Download

        • memory/1408-60-0x0000000030000000-0x0000000030385000-memory.dmp

          Filesize

          3.5MB

          Download