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Overview

overview

10

Static

static

fcd5ed5542...03.exe

windows7_x64

10

fcd5ed5542...03.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    183s
  • max time network
    217s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    19/02/2022, 23:59

Sharing

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General

  • Target

    fcd5ed5542df043c9b5dcfa89aaa032e2fc965b076a138579ffb2da7bd1fe303.exe

  • Size

    120KB

  • MD5

    8e0ce316072caa6dd41159dbd5619ece

  • SHA1

    0adbcb1734289e7e430ed8fbe44244aadd7b50e4

  • SHA256

    fcd5ed5542df043c9b5dcfa89aaa032e2fc965b076a138579ffb2da7bd1fe303

  • SHA512

    a0f0fd7245b9fbb3edbf4d450964e7e9475855ba058e9dff0414bd98df4847a027cb0c9ff12a994bcaf651a8dd871bce924fced0e4735cfe7ec258ffa9d05df4

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = '2neBqEej6'; $torlink = 'http://rk2zzyh63g5avvii4irkhymha3irblchdfj7prk6zwy23f6kahidkpqd.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://rk2zzyh63g5avvii4irkhymha3irblchdfj7prk6zwy23f6kahidkpqd.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
  • Enumerates connected drives 3 TTPs 22 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • 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\fcd5ed5542df043c9b5dcfa89aaa032e2fc965b076a138579ffb2da7bd1fe303.exe
    "C:\Users\Admin\AppData\Local\Temp\fcd5ed5542df043c9b5dcfa89aaa032e2fc965b076a138579ffb2da7bd1fe303.exe"
    1⤵
    • Loads dropped DLL
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1068
    • C:\Users\Admin\AppData\Local\Temp\adStLBMrerep.exe
      "C:\Users\Admin\AppData\Local\Temp\adStLBMrerep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1148
    • C:\Users\Admin\AppData\Local\Temp\FCQrkZRtxlan.exe
      "C:\Users\Admin\AppData\Local\Temp\FCQrkZRtxlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:308
    • C:\Users\Admin\AppData\Local\Temp\KTFiizbqRlan.exe
      "C:\Users\Admin\AppData\Local\Temp\KTFiizbqRlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1272
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:17944
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:17952
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:84188
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:84316
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:84196
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:84332
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:84248
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:84324
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:84272
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:84308

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/1068-54-0x0000000075AE1000-0x0000000075AE3000-memory.dmp

            Filesize

            8KB

            Download