Analysis

  • max time kernel
    169s
  • max time network
    146s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    20-02-2022 07:21

General

  • Target

    535cf4aae10b9beaae1893779cce05cfbd7767a854fa78401e1d9d46e8c212ed.exe

  • Size

    206KB

  • MD5

    3f4ab625f691c1f68d23c9c59af56d50

  • SHA1

    62a7d68740a3064948805f31137befa0d57207f7

  • SHA256

    535cf4aae10b9beaae1893779cce05cfbd7767a854fa78401e1d9d46e8c212ed

  • SHA512

    ead89be0dd5d2b8417b5c375f1ed71ceb53558020b8652491ede416a6bf88fc094e1714bac1b0405a9c862ad10c31eff9dd9f1f814d977af17e86eb9ade52026

Score
10/10

Malware Config

Extracted

Path

C:\RyukReadMe.txt

Family

ryuk

Ransom Note
Your network has been penetrated. All files on each network host have been encrypted with a strong algorithm. Backups were encrypted too. Shadow copies also removed, so F8 or any other methods may damage encrypted data but not recover. Only we have exclusive decryption software, suitable for your situation. More than a year ago, world experts recognized the impossibility of such encryption deciphering by any means except the original decoder. No decryption software is available in the public. Antivirus companies, researchers, IT specialists, and any other persons cannot help you to decipher the data. Decryption takes from ten minutes up to several hours. It is performed automatically and doesn't require from you any actions except decoder launching. DO NOT RESET OR SHUTDOWN SYSTEM � files may be damaged. DO NOT DELETE readme files. To confirm our honest intentions. Send 2 different random files and you will get them back decrypted. It can be from different computers on your network to be sure that one key decrypts everything. We will unlock 2 files for free. To get info (decrypt your files) contact us a [email protected] or [email protected] You will receive btc address for payment in the reply letter Ryuk No system is safe

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Drops desktop.ini file(s) 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 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\taskhost.exe
    "taskhost.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1120
    • C:\Windows\System32\net.exe
      "C:\Windows\System32\net.exe" stop "samss" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2380
      • C:\Windows\system32\net1.exe
        C:\Windows\system32\net1 stop "samss" /y
        3⤵
          PID:2672
      • C:\Windows\System32\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:32924
        • C:\Windows\system32\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:32948
        • C:\Windows\System32\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
            PID:34624
            • C:\Windows\system32\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:34664
          • C:\Windows\system32\Dwm.exe
            "C:\Windows\system32\Dwm.exe"
            1⤵
              PID:1180
            • C:\Users\Admin\AppData\Local\Temp\535cf4aae10b9beaae1893779cce05cfbd7767a854fa78401e1d9d46e8c212ed.exe
              "C:\Users\Admin\AppData\Local\Temp\535cf4aae10b9beaae1893779cce05cfbd7767a854fa78401e1d9d46e8c212ed.exe"
              1⤵
              • Drops desktop.ini file(s)
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:792
              • C:\Windows\System32\net.exe
                "C:\Windows\System32\net.exe" stop "spooler" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:660
                • C:\Windows\system32\net1.exe
                  C:\Windows\system32\net1 stop "spooler" /y
                  3⤵
                    PID:872
                • C:\Windows\System32\net.exe
                  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:272
                  • C:\Windows\system32\net1.exe
                    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                    3⤵
                      PID:1324
                  • C:\Windows\System32\net.exe
                    "C:\Windows\System32\net.exe" stop "samss" /y
                    2⤵
                    • Suspicious use of WriteProcessMemory
                    PID:1488
                    • C:\Windows\system32\net1.exe
                      C:\Windows\system32\net1 stop "samss" /y
                      3⤵
                        PID:1560
                    • C:\Windows\System32\net.exe
                      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:1072
                      • C:\Windows\system32\net1.exe
                        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                        3⤵
                          PID:1564
                      • C:\Windows\System32\net.exe
                        "C:\Windows\System32\net.exe" stop "samss" /y
                        2⤵
                        • Suspicious use of WriteProcessMemory
                        PID:616
                        • C:\Windows\system32\net1.exe
                          C:\Windows\system32\net1 stop "samss" /y
                          3⤵
                            PID:1500
                        • C:\Windows\System32\net.exe
                          "C:\Windows\System32\net.exe" stop "samss" /y
                          2⤵
                          • Suspicious use of WriteProcessMemory
                          PID:16952
                          • C:\Windows\system32\net1.exe
                            C:\Windows\system32\net1 stop "samss" /y
                            3⤵
                              PID:17028
                          • C:\Windows\System32\net.exe
                            "C:\Windows\System32\net.exe" stop "samss" /y
                            2⤵
                            • Suspicious use of WriteProcessMemory
                            PID:32888
                            • C:\Windows\system32\net1.exe
                              C:\Windows\system32\net1 stop "samss" /y
                              3⤵
                                PID:32912
                            • C:\Windows\System32\net.exe
                              "C:\Windows\System32\net.exe" stop "samss" /y
                              2⤵
                              • Suspicious use of WriteProcessMemory
                              PID:34572
                              • C:\Windows\system32\net1.exe
                                C:\Windows\system32\net1 stop "samss" /y
                                3⤵
                                  PID:34596
                              • C:\Windows\System32\net.exe
                                "C:\Windows\System32\net.exe" stop "samss" /y
                                2⤵
                                  PID:34616
                                  • C:\Windows\system32\net1.exe
                                    C:\Windows\system32\net1 stop "samss" /y
                                    3⤵
                                      PID:34672
                                • C:\Windows\System32\rundll32.exe
                                  C:\Windows\System32\rundll32.exe shell32.dll,SHCreateLocalServerRunDll {995C996E-D918-4a8c-A302-45719A6F4EA7} -Embedding
                                  1⤵
                                    PID:1804

                                  Network

                                  MITRE ATT&CK Enterprise v6

                                  Replay Monitor

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                                  Downloads

                                  • memory/792-55-0x000007FEFBAD1000-0x000007FEFBAD3000-memory.dmp

                                    Filesize

                                    8KB

                                  • memory/1120-54-0x000000013F0A0000-0x000000013F437000-memory.dmp

                                    Filesize

                                    3.6MB

                                  • memory/1120-56-0x000000013F0A0000-0x000000013F437000-memory.dmp

                                    Filesize

                                    3.6MB

                                  • memory/1180-58-0x000000013F0A0000-0x000000013F437000-memory.dmp

                                    Filesize

                                    3.6MB