Overview

overview

10

Static

static

0cf36731f5...b3.exe

windows7_x64

10

0cf36731f5...b3.exe

windows10_x64

10

Analysis

  • max time kernel
    139s
  • max time network
    117s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    09/11/2020, 20:48

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General

  • Target
    0cf36731f5b8651d53fc651607c3fccac24b631c08dca4493d8e07d2fbff1db3.exe
  • Size 167KB
  • Sample201109-a67lya7nqn
  • SHA256 0cf36731f5b8651d53fc651607c3fccac24b631c08dca4493d8e07d2fbff1db3
  • MD5 SHA1 SHA512
Score
10/10
ryukransomware

Malware Config

Extracted

Path

  • C:\RyukReadMe.txt

  • 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
Wallets

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Drops desktop.ini file(s) 61 IoCs
  • 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 14 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 56 IoCs

Processes

  • c:\windows\system32\sihost.exe
    sihost.exe
    1⤵
      PID:2804
    • c:\windows\system32\svchost.exe
      c:\windows\system32\svchost.exe -k unistacksvcgroup -s CDPUserSvc
      1⤵
        PID:2848
      • c:\windows\system32\taskhostw.exe
        taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
        1⤵
          PID:2924
        • C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe
          "C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe" -ServerName:App.AppXtk181tbxbce2qsex02s8tw7hfxa9xb3t.mca
          1⤵
            PID:3364
          • C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe
            "C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe" -ServerName:CortanaUI.AppXa50dqqa5gqv4a428c9y1jjw7m3btvepj.mca
            1⤵
              PID:3420
            • C:\Windows\System32\RuntimeBroker.exe
              C:\Windows\System32\RuntimeBroker.exe -Embedding
              1⤵
                PID:3636
              • C:\Windows\system32\DllHost.exe
                C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
                1⤵
                  PID:3944
                • C:\Users\Admin\AppData\Local\Temp\0cf36731f5b8651d53fc651607c3fccac24b631c08dca4493d8e07d2fbff1db3.exe
                  "C:\Users\Admin\AppData\Local\Temp\0cf36731f5b8651d53fc651607c3fccac24b631c08dca4493d8e07d2fbff1db3.exe"
                  1⤵
                  • Drops desktop.ini file(s)
                  • Drops file in Program Files directory
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  • Suspicious use of WriteProcessMemory
                  PID:4776
                  • C:\Windows\SysWOW64\net.exe
                    "C:\Windows\System32\net.exe" stop "spooler" /y
                    2⤵
                    • Suspicious use of WriteProcessMemory
                    PID:3488
                    • C:\Windows\SysWOW64\net1.exe
                      C:\Windows\system32\net1 stop "spooler" /y
                      3⤵
                        PID:4448
                    • C:\Windows\SysWOW64\net.exe
                      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:4424
                      • C:\Windows\SysWOW64\net1.exe
                        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                        3⤵
                          PID:3452
                      • C:\Windows\SysWOW64\net.exe
                        "C:\Windows\System32\net.exe" stop "samss" /y
                        2⤵
                        • Suspicious use of WriteProcessMemory
                        PID:4504
                        • C:\Windows\SysWOW64\net1.exe
                          C:\Windows\system32\net1 stop "samss" /y
                          3⤵
                            PID:1832
                        • C:\Windows\SysWOW64\net.exe
                          "C:\Windows\System32\net.exe" stop "samss" /y
                          2⤵
                          • Suspicious use of WriteProcessMemory
                          PID:1532
                          • C:\Windows\SysWOW64\net1.exe
                            C:\Windows\system32\net1 stop "samss" /y
                            3⤵
                              PID:2684
                          • C:\Windows\SysWOW64\net.exe
                            "C:\Windows\System32\net.exe" stop "samss" /y
                            2⤵
                            • Suspicious use of WriteProcessMemory
                            PID:29392
                            • C:\Windows\SysWOW64\net1.exe
                              C:\Windows\system32\net1 stop "samss" /y
                              3⤵
                                PID:29488
                            • C:\Windows\SysWOW64\net.exe
                              "C:\Windows\System32\net.exe" stop "samss" /y
                              2⤵
                              • Suspicious use of WriteProcessMemory
                              PID:33556
                              • C:\Windows\SysWOW64\net1.exe
                                C:\Windows\system32\net1 stop "samss" /y
                                3⤵
                                  PID:33632
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "samss" /y
                                2⤵
                                • Suspicious use of WriteProcessMemory
                                PID:67624
                                • C:\Windows\SysWOW64\net1.exe
                                  C:\Windows\system32\net1 stop "samss" /y
                                  3⤵
                                    PID:67788
                                • C:\Windows\SysWOW64\net.exe
                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                  2⤵
                                  • Suspicious use of WriteProcessMemory
                                  PID:80104
                                  • C:\Windows\SysWOW64\net1.exe
                                    C:\Windows\system32\net1 stop "samss" /y
                                    3⤵
                                      PID:80804
                                • C:\Windows\system32\DllHost.exe
                                  C:\Windows\system32\DllHost.exe /Processid:{AB8902B4-09CA-4BB6-B78D-A8F59079A8D5}
                                  1⤵
                                    PID:3616

                                  Network

                                        MITRE ATT&CK Enterprise v6

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                                        Downloads

                                        memory/4776-12-0x0000000003490000-0x0000000003491000-memory.dmp
                                        Download

                                        memory/4776-16-0x0000000003390000-0x0000000003391000-memory.dmp
                                        Download

                                        memory/4776-8-0x0000000003100000-0x0000000003101000-memory.dmp
                                        Download

                                        memory/4776-1-0x0000000002B00000-0x0000000002B01000-memory.dmp
                                        Download

                                        memory/4776-0-0x0000000002300000-0x0000000002301000-memory.dmp
                                        Download

                                        memory/4776-13-0x0000000003C90000-0x0000000003C91000-memory.dmp
                                        Download

                                        memory/4776-21-0x0000000004EC0000-0x0000000004EC1000-memory.dmp
                                        Download

                                        memory/4776-20-0x0000000003DD0000-0x0000000003DD1000-memory.dmp
                                        Download

                                        memory/4776-17-0x0000000003B90000-0x0000000003B91000-memory.dmp
                                        Download

                                        memory/4776-9-0x0000000003900000-0x0000000003901000-memory.dmp
                                        Download