Analysis

  • max time kernel
    1630s
  • max time network
    1567s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • submitted
    27-10-2021 08:52

General

  • Target

    781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a.bin.sample.exe

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'TLS7ST8vlU'; $torlink = 'http://htv4omqldafxwhum7ya3m37o3zcbo2d7kidcpgvp6lky62gi6czx6iqd.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://htv4omqldafxwhum7ya3m37o3zcbo2d7kidcpgvp6lky62gi6czx6iqd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Executes dropped EXE 3 IoCs
  • Modifies extensions of user files 22 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Drops startup file 1 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
  • Drops desktop.ini file(s) 1 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.

  • 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 58 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a.bin.sample.exe
    "C:\Users\Admin\AppData\Local\Temp\781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a.bin.sample.exe"
    1⤵
    • Modifies extensions of user files
    • Drops startup file
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2828
    • C:\Users\Admin\AppData\Local\Temp\oqbrBsQMlrep.exe
      "C:\Users\Admin\AppData\Local\Temp\oqbrBsQMlrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:2760
    • C:\Users\Admin\AppData\Local\Temp\wCNMkRxUslan.exe
      "C:\Users\Admin\AppData\Local\Temp\wCNMkRxUslan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1168
    • C:\Users\Admin\AppData\Local\Temp\JWPZKncnulan.exe
      "C:\Users\Admin\AppData\Local\Temp\JWPZKncnulan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:880
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:4060
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:3044
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
        PID:3320
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:368
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3296
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:2188
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3716
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:1208
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:1228
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "samss" /y
                3⤵
                  PID:2332
              • C:\Windows\SysWOW64\SCHTASKS.exe
                SCHTASKS /CREATE /NP /SC DAILY /TN "Print67" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\6HVPl.dll" /ST 10:25 /SD 10/28/2021 /ED 11/04/2021
                2⤵
                • Creates scheduled task(s)
                PID:3636
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:147384
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:146720
                • C:\Windows\SysWOW64\net.exe
                  "C:\Windows\System32\net.exe" stop "samss" /y
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:147204
                  • C:\Windows\SysWOW64\net1.exe
                    C:\Windows\system32\net1 stop "samss" /y
                    3⤵
                      PID:147112
                  • C:\Windows\SysWOW64\net.exe
                    "C:\Windows\System32\net.exe" stop "samss" /y
                    2⤵
                    • Suspicious use of WriteProcessMemory
                    PID:233324
                    • C:\Windows\SysWOW64\net1.exe
                      C:\Windows\system32\net1 stop "samss" /y
                      3⤵
                        PID:233224
                    • C:\Windows\SysWOW64\net.exe
                      "C:\Windows\System32\net.exe" stop "samss" /y
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:233440
                      • C:\Windows\SysWOW64\net1.exe
                        C:\Windows\system32\net1 stop "samss" /y
                        3⤵
                          PID:233252
                      • C:\Windows\SysWOW64\net.exe
                        "C:\Windows\System32\net.exe" stop "samss" /y
                        2⤵
                          PID:293608
                          • C:\Windows\SysWOW64\net1.exe
                            C:\Windows\system32\net1 stop "samss" /y
                            3⤵
                              PID:293736
                          • C:\Windows\SysWOW64\net.exe
                            "C:\Windows\System32\net.exe" stop "samss" /y
                            2⤵
                              PID:293636
                              • C:\Windows\SysWOW64\net1.exe
                                C:\Windows\system32\net1 stop "samss" /y
                                3⤵
                                  PID:293880
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "samss" /y
                                2⤵
                                  PID:293876
                                  • C:\Windows\SysWOW64\net1.exe
                                    C:\Windows\system32\net1 stop "samss" /y
                                    3⤵
                                      PID:293664
                                  • C:\Windows\SysWOW64\net.exe
                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                    2⤵
                                      PID:293736
                                      • C:\Windows\SysWOW64\net1.exe
                                        C:\Windows\system32\net1 stop "samss" /y
                                        3⤵
                                          PID:293552
                                      • C:\Windows\SysWOW64\net.exe
                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                        2⤵
                                          PID:293496
                                          • C:\Windows\SysWOW64\net1.exe
                                            C:\Windows\system32\net1 stop "samss" /y
                                            3⤵
                                              PID:293540
                                          • C:\Windows\SysWOW64\net.exe
                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                            2⤵
                                              PID:293788
                                              • C:\Windows\SysWOW64\net1.exe
                                                C:\Windows\system32\net1 stop "samss" /y
                                                3⤵
                                                  PID:293356
                                              • C:\Windows\SysWOW64\net.exe
                                                "C:\Windows\System32\net.exe" stop "samss" /y
                                                2⤵
                                                  PID:293640
                                                  • C:\Windows\SysWOW64\net1.exe
                                                    C:\Windows\system32\net1 stop "samss" /y
                                                    3⤵
                                                      PID:294672
                                                  • C:\Windows\SysWOW64\net.exe
                                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                                    2⤵
                                                      PID:294828
                                                      • C:\Windows\SysWOW64\net1.exe
                                                        C:\Windows\system32\net1 stop "samss" /y
                                                        3⤵
                                                          PID:294712
                                                      • C:\Windows\SysWOW64\net.exe
                                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                                        2⤵
                                                          PID:293676
                                                          • C:\Windows\System32\Conhost.exe
                                                            \??\C:\Windows\system32\conhost.exe 0xffffffff -ForceV1
                                                            3⤵
                                                              PID:293640
                                                            • C:\Windows\SysWOW64\net1.exe
                                                              C:\Windows\system32\net1 stop "samss" /y
                                                              3⤵
                                                                PID:294772
                                                            • C:\Windows\SysWOW64\net.exe
                                                              "C:\Windows\System32\net.exe" stop "samss" /y
                                                              2⤵
                                                                PID:294468
                                                                • C:\Windows\SysWOW64\net1.exe
                                                                  C:\Windows\system32\net1 stop "samss" /y
                                                                  3⤵
                                                                    PID:294432
                                                                • C:\Windows\SysWOW64\net.exe
                                                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                                                  2⤵
                                                                    PID:179964
                                                                    • C:\Windows\SysWOW64\net1.exe
                                                                      C:\Windows\system32\net1 stop "samss" /y
                                                                      3⤵
                                                                        PID:293952
                                                                    • C:\Windows\SysWOW64\net.exe
                                                                      "C:\Windows\System32\net.exe" stop "samss" /y
                                                                      2⤵
                                                                        PID:293520
                                                                        • C:\Windows\SysWOW64\net1.exe
                                                                          C:\Windows\system32\net1 stop "samss" /y
                                                                          3⤵
                                                                            PID:294136
                                                                        • C:\Windows\SysWOW64\net.exe
                                                                          "C:\Windows\System32\net.exe" stop "samss" /y
                                                                          2⤵
                                                                            PID:1400
                                                                            • C:\Windows\SysWOW64\net1.exe
                                                                              C:\Windows\system32\net1 stop "samss" /y
                                                                              3⤵
                                                                                PID:294900
                                                                            • C:\Windows\SysWOW64\net.exe
                                                                              "C:\Windows\System32\net.exe" stop "samss" /y
                                                                              2⤵
                                                                                PID:293900
                                                                                • C:\Windows\SysWOW64\net1.exe
                                                                                  C:\Windows\system32\net1 stop "samss" /y
                                                                                  3⤵
                                                                                    PID:294244
                                                                                • C:\Windows\SysWOW64\net.exe
                                                                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                  2⤵
                                                                                    PID:321228
                                                                                    • C:\Windows\SysWOW64\net1.exe
                                                                                      C:\Windows\system32\net1 stop "samss" /y
                                                                                      3⤵
                                                                                        PID:321120
                                                                                    • C:\Windows\SysWOW64\net.exe
                                                                                      "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                      2⤵
                                                                                        PID:321196
                                                                                        • C:\Windows\SysWOW64\net1.exe
                                                                                          C:\Windows\system32\net1 stop "samss" /y
                                                                                          3⤵
                                                                                            PID:321404
                                                                                        • C:\Windows\SysWOW64\net.exe
                                                                                          "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                          2⤵
                                                                                            PID:490984
                                                                                            • C:\Windows\SysWOW64\net1.exe
                                                                                              C:\Windows\system32\net1 stop "samss" /y
                                                                                              3⤵
                                                                                                PID:492116
                                                                                            • C:\Windows\SysWOW64\net.exe
                                                                                              "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                              2⤵
                                                                                                PID:490976
                                                                                                • C:\Windows\SysWOW64\net1.exe
                                                                                                  C:\Windows\system32\net1 stop "samss" /y
                                                                                                  3⤵
                                                                                                    PID:491076
                                                                                                • C:\Windows\SysWOW64\net.exe
                                                                                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                  2⤵
                                                                                                    PID:691996
                                                                                                    • C:\Windows\SysWOW64\net1.exe
                                                                                                      C:\Windows\system32\net1 stop "samss" /y
                                                                                                      3⤵
                                                                                                        PID:692088
                                                                                                    • C:\Windows\SysWOW64\net.exe
                                                                                                      "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                      2⤵
                                                                                                        PID:692008
                                                                                                        • C:\Windows\SysWOW64\net1.exe
                                                                                                          C:\Windows\system32\net1 stop "samss" /y
                                                                                                          3⤵
                                                                                                            PID:692108
                                                                                                        • C:\Windows\SysWOW64\net.exe
                                                                                                          "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                          2⤵
                                                                                                            PID:790632
                                                                                                            • C:\Windows\SysWOW64\net1.exe
                                                                                                              C:\Windows\system32\net1 stop "samss" /y
                                                                                                              3⤵
                                                                                                                PID:790744
                                                                                                            • C:\Windows\SysWOW64\net.exe
                                                                                                              "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                              2⤵
                                                                                                                PID:790628
                                                                                                                • C:\Windows\SysWOW64\net1.exe
                                                                                                                  C:\Windows\system32\net1 stop "samss" /y
                                                                                                                  3⤵
                                                                                                                    PID:790740
                                                                                                                • C:\Windows\SysWOW64\net.exe
                                                                                                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                                  2⤵
                                                                                                                    PID:942024
                                                                                                                    • C:\Windows\SysWOW64\net1.exe
                                                                                                                      C:\Windows\system32\net1 stop "samss" /y
                                                                                                                      3⤵
                                                                                                                        PID:942072
                                                                                                                    • C:\Windows\SysWOW64\net.exe
                                                                                                                      "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                                      2⤵
                                                                                                                        PID:942060
                                                                                                                        • C:\Windows\SysWOW64\net1.exe
                                                                                                                          C:\Windows\system32\net1 stop "samss" /y
                                                                                                                          3⤵
                                                                                                                            PID:941808

                                                                                                                      Network

                                                                                                                      MITRE ATT&CK Enterprise v6

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