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
    287s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    23-04-2021 11:24

Sharing

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Report Analysis Logs

General

  • Target

    1dd4a0983a6884dddc3edf27eb5fdfc87664ed63.exe

  • Size

    274KB

  • MD5

    4d74af75deddc969fef5fd89e65fa251

  • SHA1

    1dd4a0983a6884dddc3edf27eb5fdfc87664ed63

  • SHA256

    8879a8d1508c3297200c608f3a93da5387521767c050f17aed78dde8a0cbfe12

  • SHA512

    56cbd165259045e262b064bc1d5dd242304ef30f34b9b899b9295f79aabba02cb09438ab0c429c3828b5c13e8ebcb8f5dbae85eb4c9490f65cec9807a24d062c

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 5 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\1dd4a0983a6884dddc3edf27eb5fdfc87664ed63.exe
    "C:\Users\Admin\AppData\Local\Temp\1dd4a0983a6884dddc3edf27eb5fdfc87664ed63.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:1840
    • C:\Users\Admin\AppData\Local\Temp\iRkoXDlZrrep.exe
      "C:\Users\Admin\AppData\Local\Temp\iRkoXDlZrrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1544
    • C:\Users\Admin\AppData\Local\Temp\rmyblzCBElan.exe
      "C:\Users\Admin\AppData\Local\Temp\rmyblzCBElan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1696
    • C:\Users\Admin\AppData\Local\Temp\gHKVXXJzSlan.exe
      "C:\Users\Admin\AppData\Local\Temp\gHKVXXJzSlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:2592
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2692
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2704
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3212
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:3244
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3252
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:3316
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3284
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:3736
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3800
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:3972
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
                PID:7996
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:7368
                • C:\Windows\SysWOW64\net.exe
                  "C:\Windows\System32\net.exe" stop "samss" /y
                  2⤵
                    PID:8180
                    • C:\Windows\SysWOW64\net1.exe
                      C:\Windows\system32\net1 stop "samss" /y
                      3⤵
                        PID:6428
                    • C:\Windows\SysWOW64\SCHTASKS.exe
                      SCHTASKS /CREATE /NP /SC DAILY /TN "Printxz" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\Xy84e.dll" /ST 10:25 /SD 04/24/2021 /ED 05/01/2021
                      2⤵
                      • Creates scheduled task(s)
                      PID:7728
                    • C:\Windows\SysWOW64\net.exe
                      "C:\Windows\System32\net.exe" stop "samss" /y
                      2⤵
                        PID:8888
                        • C:\Windows\SysWOW64\net1.exe
                          C:\Windows\system32\net1 stop "samss" /y
                          3⤵
                            PID:8920
                        • C:\Windows\SysWOW64\net.exe
                          "C:\Windows\System32\net.exe" stop "samss" /y
                          2⤵
                            PID:8936
                            • C:\Windows\SysWOW64\net1.exe
                              C:\Windows\system32\net1 stop "samss" /y
                              3⤵
                                PID:8964
                          • 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:1540
                            • C:\Windows\syswow64\MsiExec.exe
                              C:\Windows\syswow64\MsiExec.exe -Embedding 2E5C9699F4C24D43B60E4E00A0CE22AD
                              2⤵
                              • Loads dropped DLL
                              PID:3852
                            • C:\Windows\system32\MsiExec.exe
                              C:\Windows\system32\MsiExec.exe -Embedding A5E11C741BAB53E4A363B2DE643442FC
                              2⤵
                              • Loads dropped DLL
                              PID:3100

                          Network

                          MITRE ATT&CK Enterprise v6

                          Replay Monitor

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                          Downloads

                          • memory/1540-149-0x000007FEFB681000-0x000007FEFB683000-memory.dmp

                            Filesize

                            8KB

                            Download

                          • memory/1544-68-0x0000000035000000-0x00000000376DF000-memory.dmp

                            Filesize

                            38.9MB

                            Download

                          • memory/1696-75-0x0000000035000000-0x00000000376DF000-memory.dmp

                            Filesize

                            38.9MB

                            Download

                          • memory/1840-62-0x0000000074D91000-0x0000000074D93000-memory.dmp

                            Filesize

                            8KB

                            Download

                          • memory/1840-61-0x0000000035000000-0x00000000376DF000-memory.dmp

                            Filesize

                            38.9MB

                            Download

                          • memory/1840-60-0x0000000000020000-0x000000000003F000-memory.dmp

                            Filesize

                            124KB

                            Download

                          • memory/2592-82-0x0000000035000000-0x00000000376DF000-memory.dmp

                            Filesize

                            38.9MB

                            Download