Analysis

  • max time kernel
    302s
  • max time network
    295s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    23-04-2021 11:24

General

  • Target

    de2b5aa6de6f7ff053308084217f7a9b977489027fb103729d6a7d94298c6a6b.exe

  • Size

    274KB

  • MD5

    aaf3abc4054f800aaa429c4f2e4b20af

  • SHA1

    16e859c1222b7f4dba2361480ce33a0564e4cabf

  • SHA256

    de2b5aa6de6f7ff053308084217f7a9b977489027fb103729d6a7d94298c6a6b

  • SHA512

    650e515d0ec199efa74ed4bb2e0f622da609b9559d2663c990bb5310997f44785408f0ed2c35405445962abe33ba74266bc7f3c8b5afa0b8035856364f4e2de6

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.

  • Executes dropped EXE 3 IoCs
  • Modifies extensions of user files 7 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Loads dropped DLL 6 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 23 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.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\de2b5aa6de6f7ff053308084217f7a9b977489027fb103729d6a7d94298c6a6b.exe
    "C:\Users\Admin\AppData\Local\Temp\de2b5aa6de6f7ff053308084217f7a9b977489027fb103729d6a7d94298c6a6b.exe"
    1⤵
    • Modifies extensions of user files
    • Loads dropped DLL
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1108
    • C:\Users\Admin\AppData\Local\Temp\vRZSIYUWerep.exe
      "C:\Users\Admin\AppData\Local\Temp\vRZSIYUWerep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1628
    • C:\Users\Admin\AppData\Local\Temp\LMHyZYTwZlan.exe
      "C:\Users\Admin\AppData\Local\Temp\LMHyZYTwZlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1476
    • C:\Users\Admin\AppData\Local\Temp\XIrYqECZKlan.exe
      "C:\Users\Admin\AppData\Local\Temp\XIrYqECZKlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1584
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2700
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2712
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3136
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:3292
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3300
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:3340
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3364
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:3604
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3504
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:4080
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:564
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "samss" /y
                3⤵
                  PID:1012
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                  PID:4912
                  • C:\Windows\SysWOW64\net1.exe
                    C:\Windows\system32\net1 stop "samss" /y
                    3⤵
                      PID:3808
                  • C:\Windows\SysWOW64\SCHTASKS.exe
                    SCHTASKS /CREATE /NP /SC DAILY /TN "PrintN8" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\KYNDS.dll" /ST 10:25 /SD 04/24/2021 /ED 05/01/2021
                    2⤵
                    • Creates scheduled task(s)
                    PID:4868

                Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                • memory/1108-61-0x0000000035000000-0x00000000376DF000-memory.dmp

                  Filesize

                  38.9MB

                • memory/1108-62-0x0000000076E11000-0x0000000076E13000-memory.dmp

                  Filesize

                  8KB

                • memory/1108-60-0x0000000000020000-0x000000000003F000-memory.dmp

                  Filesize

                  124KB

                • memory/1476-74-0x0000000035000000-0x00000000376DF000-memory.dmp

                  Filesize

                  38.9MB

                • memory/1584-81-0x0000000035000000-0x00000000376DF000-memory.dmp

                  Filesize

                  38.9MB

                • memory/1628-68-0x0000000035000000-0x00000000376DF000-memory.dmp

                  Filesize

                  38.9MB