Overview

overview

10

Static

static

ffbf608aae...66.exe

windows7_x64

10

ffbf608aae...66.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    146s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    05-03-2022 22:40

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General

  • Target

    ffbf608aaef69e1ee53f8303c685604dd584985f809d19f6cbc914fa86b3ae66.exe

  • Size

    118KB

  • MD5

    a31089dc3cafe77c39268273d689193b

  • SHA1

    032e0b9a0bf012401507be974ee6bdb3e6726fd7

  • SHA256

    ffbf608aaef69e1ee53f8303c685604dd584985f809d19f6cbc914fa86b3ae66

  • SHA512

    d92748b34286c21f4781b147000be1b54cf57e14587517638647b8369ccd01b3ecb00545be0d87d44f9dde6b30a404db2740bf06275dea647efc33eafd65d2f4

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'N2QvTsXamJ'; $torlink = 'http://zq6gyokyso6dgsxitjuk2tkq2rl4saq4tkz2idcf6z3tfondtvemshad.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};
URLs

http://zq6gyokyso6dgsxitjuk2tkq2rl4saq4tkz2idcf6z3tfondtvemshad.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 6 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • 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.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of WriteProcessMemory 52 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ffbf608aaef69e1ee53f8303c685604dd584985f809d19f6cbc914fa86b3ae66.exe
    "C:\Users\Admin\AppData\Local\Temp\ffbf608aaef69e1ee53f8303c685604dd584985f809d19f6cbc914fa86b3ae66.exe"
    1⤵
    • Loads dropped DLL
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1908
    • C:\Users\Admin\AppData\Local\Temp\XJgJijnKVrep.exe
      "C:\Users\Admin\AppData\Local\Temp\XJgJijnKVrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:576
    • C:\Users\Admin\AppData\Local\Temp\ypXbiYOlylan.exe
      "C:\Users\Admin\AppData\Local\Temp\ypXbiYOlylan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:316
    • C:\Users\Admin\AppData\Local\Temp\uIvPQsuPalan.exe
      "C:\Users\Admin\AppData\Local\Temp\uIvPQsuPalan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1004
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:22084
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:22092
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:46896
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:51092
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:46888
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:51136
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:46948
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:51100
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:46956
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:51108

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/1908-55-0x0000000076731000-0x0000000076733000-memory.dmp

            Filesize

            8KB

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