Overview

overview

10

Static

static

8

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Analysis

  • max time kernel
    301s
  • max time network
    294s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    23-04-2021 11:24

Sharing

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Report Analysis Logs

General

  • Target

    352b1f3533ded8c575246d4466f68c49.exe

  • Size

    545KB

  • MD5

    352b1f3533ded8c575246d4466f68c49

  • SHA1

    e430730620feec3673b9c38d87482c9294421b19

  • SHA256

    b513cfbd101e728ec41c9d6f6515278434820466bfe8e4bc1849f2418d3f86da

  • SHA512

    db9ab4315417679f6d1003e97067e87aae7f1c2b9f5a8358e32004d8322a997fc5f1627c3535517ca515e9493e9edb7292f1d1c6080e19d8ea71419fd4c6e9c9

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
  • Modifies extensions of user files 1 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Loads dropped DLL 16 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 47 IoCs

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

  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 14 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.

    persistence
  • Modifies data under HKEY_USERS 3 IoCs
  • Modifies registry class 20 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 43 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\352b1f3533ded8c575246d4466f68c49.exe
    "C:\Users\Admin\AppData\Local\Temp\352b1f3533ded8c575246d4466f68c49.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:1084
    • C:\Users\Admin\AppData\Local\Temp\OLdwrpCTKrep.exe
      "C:\Users\Admin\AppData\Local\Temp\OLdwrpCTKrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1640
    • C:\Users\Admin\AppData\Local\Temp\yWPYteMiqlan.exe
      "C:\Users\Admin\AppData\Local\Temp\yWPYteMiqlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1768
    • C:\Users\Admin\AppData\Local\Temp\MClNdzbuVlan.exe
      "C:\Users\Admin\AppData\Local\Temp\MClNdzbuVlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1480
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2664
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2676
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2800
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:2748
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2976
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:3244
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3380
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:3580
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3620
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:3656
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
                PID:7760
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:6500
                • C:\Windows\SysWOW64\net.exe
                  "C:\Windows\System32\net.exe" stop "samss" /y
                  2⤵
                    PID:7812
                    • C:\Windows\SysWOW64\net1.exe
                      C:\Windows\system32\net1 stop "samss" /y
                      3⤵
                        PID:7972
                    • C:\Windows\SysWOW64\SCHTASKS.exe
                      SCHTASKS /CREATE /NP /SC DAILY /TN "Print4H" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\8qz1P.dll" /ST 10:25 /SD 04/24/2021 /ED 05/01/2021
                      2⤵
                      • Creates scheduled task(s)
                      PID:8128
                  • C:\Windows\system32\msiexec.exe
                    C:\Windows\system32\msiexec.exe /V
                    1⤵
                    • Loads dropped DLL
                    • Enumerates connected drives
                    • Drops file in Windows directory
                    • Modifies data under HKEY_USERS
                    • Modifies registry class
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    • Suspicious use of WriteProcessMemory
                    PID:3712
                    • C:\Windows\syswow64\MsiExec.exe
                      C:\Windows\syswow64\MsiExec.exe -Embedding C7CE031727D00533D029DD541624C1DC
                      2⤵
                      • Loads dropped DLL
                      PID:3080
                    • C:\Windows\system32\MsiExec.exe
                      C:\Windows\system32\MsiExec.exe -Embedding 96810EF9A84ECFE947D0592EA7A5BBDE
                      2⤵
                      • Loads dropped DLL
                      PID:1436

                  Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

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                  Downloads

                  • memory/1084-60-0x0000000035000000-0x00000000376DF000-memory.dmp

                    Filesize

                    38.9MB

                    Download

                  • memory/1084-59-0x0000000000020000-0x000000000003F000-memory.dmp

                    Filesize

                    124KB

                    Download

                  • memory/1084-61-0x00000000752F1000-0x00000000752F3000-memory.dmp

                    Filesize

                    8KB

                    Download

                  • memory/1480-80-0x0000000035000000-0x00000000376DF000-memory.dmp

                    Filesize

                    38.9MB

                    Download

                  • memory/1640-67-0x0000000035000000-0x00000000376DF000-memory.dmp

                    Filesize

                    38.9MB

                    Download

                  • memory/1768-73-0x0000000035000000-0x00000000376DF000-memory.dmp

                    Filesize

                    38.9MB

                    Download

                  • memory/3712-131-0x000007FEFBD91000-0x000007FEFBD93000-memory.dmp

                    Filesize

                    8KB

                    Download