Analysis

  • max time kernel
    1800s
  • max time network
    1567s
  • platform
    windows7_x64
  • resource
    win7-en-20210920
  • 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 10 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Loads dropped DLL 6 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 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 35 IoCs
  • Suspicious use of SendNotifyMessage 35 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
    • Loads dropped DLL
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1876
    • C:\Users\Admin\AppData\Local\Temp\mvUGHSRogrep.exe
      "C:\Users\Admin\AppData\Local\Temp\mvUGHSRogrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:792
    • C:\Users\Admin\AppData\Local\Temp\afWgJXVPJlan.exe
      "C:\Users\Admin\AppData\Local\Temp\afWgJXVPJlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1652
    • C:\Users\Admin\AppData\Local\Temp\skpNXAATolan.exe
      "C:\Users\Admin\AppData\Local\Temp\skpNXAATolan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:684
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:848
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:1060
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3036
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:1320
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3064
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:2080
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:984
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:1456
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:2068
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:848
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:30660
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "samss" /y
                3⤵
                  PID:30688
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                  PID:30708
                  • C:\Windows\SysWOW64\net1.exe
                    C:\Windows\system32\net1 stop "samss" /y
                    3⤵
                      PID:29896
                  • C:\Windows\SysWOW64\net.exe
                    "C:\Windows\System32\net.exe" stop "samss" /y
                    2⤵
                      PID:246324
                      • C:\Windows\SysWOW64\net1.exe
                        C:\Windows\system32\net1 stop "samss" /y
                        3⤵
                          PID:246492
                      • C:\Windows\SysWOW64\net.exe
                        "C:\Windows\System32\net.exe" stop "samss" /y
                        2⤵
                          PID:248716
                          • C:\Windows\SysWOW64\net1.exe
                            C:\Windows\system32\net1 stop "samss" /y
                            3⤵
                              PID:250288
                          • C:\Windows\SysWOW64\SCHTASKS.exe
                            SCHTASKS /CREATE /NP /SC DAILY /TN "PrintSu" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\WCfIU.dll" /ST 10:25 /SD 10/28/2021 /ED 11/04/2021
                            2⤵
                            • Creates scheduled task(s)
                            PID:533272
                          • C:\Windows\SysWOW64\net.exe
                            "C:\Windows\System32\net.exe" stop "samss" /y
                            2⤵
                              PID:557480
                              • C:\Windows\SysWOW64\net1.exe
                                C:\Windows\system32\net1 stop "samss" /y
                                3⤵
                                  PID:561612
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "samss" /y
                                2⤵
                                  PID:557488
                                  • C:\Windows\SysWOW64\net1.exe
                                    C:\Windows\system32\net1 stop "samss" /y
                                    3⤵
                                      PID:561604
                                  • C:\Windows\SysWOW64\net.exe
                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                    2⤵
                                      PID:993624
                                      • C:\Windows\SysWOW64\net1.exe
                                        C:\Windows\system32\net1 stop "samss" /y
                                        3⤵
                                          PID:993668
                                      • C:\Windows\SysWOW64\net.exe
                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                        2⤵
                                          PID:993656
                                          • C:\Windows\SysWOW64\net1.exe
                                            C:\Windows\system32\net1 stop "samss" /y
                                            3⤵
                                              PID:993700
                                          • C:\Windows\SysWOW64\net.exe
                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                            2⤵
                                              PID:1.39616e+06
                                              • C:\Windows\SysWOW64\net1.exe
                                                C:\Windows\system32\net1 stop "samss" /y
                                                3⤵
                                                  PID:1.396188e+06
                                              • C:\Windows\SysWOW64\net.exe
                                                "C:\Windows\System32\net.exe" stop "samss" /y
                                                2⤵
                                                  PID:1.400272e+06
                                                  • C:\Windows\SysWOW64\net1.exe
                                                    C:\Windows\system32\net1 stop "samss" /y
                                                    3⤵
                                                      PID:1.4003e+06
                                                  • C:\Windows\SysWOW64\net.exe
                                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                                    2⤵
                                                      PID:1.779984e+06
                                                      • C:\Windows\SysWOW64\net1.exe
                                                        C:\Windows\system32\net1 stop "samss" /y
                                                        3⤵
                                                          PID:1.784116e+06
                                                      • C:\Windows\SysWOW64\net.exe
                                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                                        2⤵
                                                          PID:1.788204e+06
                                                          • C:\Windows\SysWOW64\net1.exe
                                                            C:\Windows\system32\net1 stop "samss" /y
                                                            3⤵
                                                              PID:1.788232e+06
                                                          • C:\Windows\SysWOW64\net.exe
                                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                                            2⤵
                                                              PID:2.014088e+06
                                                              • C:\Windows\SysWOW64\net1.exe
                                                                C:\Windows\system32\net1 stop "samss" /y
                                                                3⤵
                                                                  PID:2.014116e+06
                                                              • C:\Windows\SysWOW64\net.exe
                                                                "C:\Windows\System32\net.exe" stop "samss" /y
                                                                2⤵
                                                                  PID:2.018192e+06
                                                                  • C:\Windows\SysWOW64\net1.exe
                                                                    C:\Windows\system32\net1 stop "samss" /y
                                                                    3⤵
                                                                      PID:2.01822e+06
                                                                  • C:\Windows\SysWOW64\net.exe
                                                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                                                    2⤵
                                                                      PID:2.042868e+06
                                                                      • C:\Windows\SysWOW64\net1.exe
                                                                        C:\Windows\system32\net1 stop "samss" /y
                                                                        3⤵
                                                                          PID:1.858024e+06
                                                                      • C:\Windows\SysWOW64\net.exe
                                                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                                                        2⤵
                                                                          PID:1.960704e+06
                                                                          • C:\Windows\SysWOW64\net1.exe
                                                                            C:\Windows\system32\net1 stop "samss" /y
                                                                            3⤵
                                                                              PID:1.816944e+06
                                                                          • C:\Windows\SysWOW64\net.exe
                                                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                                                            2⤵
                                                                              PID:2.063344e+06
                                                                              • C:\Windows\SysWOW64\net1.exe
                                                                                C:\Windows\system32\net1 stop "samss" /y
                                                                                3⤵
                                                                                  PID:2.063376e+06
                                                                              • C:\Windows\SysWOW64\net.exe
                                                                                "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                2⤵
                                                                                  PID:2.063396e+06
                                                                                  • C:\Windows\SysWOW64\net1.exe
                                                                                    C:\Windows\system32\net1 stop "samss" /y
                                                                                    3⤵
                                                                                      PID:2.063424e+06
                                                                                  • C:\Windows\SysWOW64\net.exe
                                                                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                    2⤵
                                                                                      PID:2.248228e+06
                                                                                      • C:\Windows\SysWOW64\net1.exe
                                                                                        C:\Windows\system32\net1 stop "samss" /y
                                                                                        3⤵
                                                                                          PID:2.24826e+06
                                                                                      • C:\Windows\SysWOW64\net.exe
                                                                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                        2⤵
                                                                                          PID:2.252348e+06
                                                                                          • C:\Windows\SysWOW64\net1.exe
                                                                                            C:\Windows\system32\net1 stop "samss" /y
                                                                                            3⤵
                                                                                              PID:2.252376e+06
                                                                                          • C:\Windows\SysWOW64\net.exe
                                                                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                            2⤵
                                                                                              PID:2.60154e+06
                                                                                              • C:\Windows\SysWOW64\net1.exe
                                                                                                C:\Windows\system32\net1 stop "samss" /y
                                                                                                3⤵
                                                                                                  PID:2.601568e+06
                                                                                              • C:\Windows\SysWOW64\net.exe
                                                                                                "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                2⤵
                                                                                                  PID:2.60976e+06
                                                                                                  • C:\Windows\SysWOW64\net1.exe
                                                                                                    C:\Windows\system32\net1 stop "samss" /y
                                                                                                    3⤵
                                                                                                      PID:2.609788e+06
                                                                                                  • C:\Windows\SysWOW64\net.exe
                                                                                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                    2⤵
                                                                                                      PID:2.958952e+06
                                                                                                      • C:\Windows\SysWOW64\net1.exe
                                                                                                        C:\Windows\system32\net1 stop "samss" /y
                                                                                                        3⤵
                                                                                                          PID:2.95898e+06
                                                                                                      • C:\Windows\SysWOW64\net.exe
                                                                                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                        2⤵
                                                                                                          PID:2.967168e+06
                                                                                                          • C:\Windows\SysWOW64\net1.exe
                                                                                                            C:\Windows\system32\net1 stop "samss" /y
                                                                                                            3⤵
                                                                                                              PID:2.967196e+06
                                                                                                          • C:\Windows\SysWOW64\net.exe
                                                                                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                            2⤵
                                                                                                              PID:3.094508e+06
                                                                                                              • C:\Windows\SysWOW64\net1.exe
                                                                                                                C:\Windows\system32\net1 stop "samss" /y
                                                                                                                3⤵
                                                                                                                  PID:3.094532e+06
                                                                                                              • C:\Windows\SysWOW64\net.exe
                                                                                                                "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                                2⤵
                                                                                                                  PID:3.094552e+06
                                                                                                                  • C:\Windows\SysWOW64\net1.exe
                                                                                                                    C:\Windows\system32\net1 stop "samss" /y
                                                                                                                    3⤵
                                                                                                                      PID:3.094576e+06
                                                                                                                  • C:\Windows\SysWOW64\net.exe
                                                                                                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                                    2⤵
                                                                                                                      PID:3.094616e+06
                                                                                                                      • C:\Windows\SysWOW64\net1.exe
                                                                                                                        C:\Windows\system32\net1 stop "samss" /y
                                                                                                                        3⤵
                                                                                                                          PID:3.09464e+06
                                                                                                                      • C:\Windows\SysWOW64\net.exe
                                                                                                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                                        2⤵
                                                                                                                          PID:3.094656e+06
                                                                                                                          • C:\Windows\SysWOW64\net1.exe
                                                                                                                            C:\Windows\system32\net1 stop "samss" /y
                                                                                                                            3⤵
                                                                                                                              PID:3.09468e+06
                                                                                                                          • C:\Windows\SysWOW64\net.exe
                                                                                                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                                            2⤵
                                                                                                                              PID:3.18486e+06
                                                                                                                              • C:\Windows\SysWOW64\net1.exe
                                                                                                                                C:\Windows\system32\net1 stop "samss" /y
                                                                                                                                3⤵
                                                                                                                                  PID:3.184884e+06
                                                                                                                              • C:\Windows\SysWOW64\net.exe
                                                                                                                                "C:\Windows\System32\net.exe" stop "samss" /y
                                                                                                                                2⤵
                                                                                                                                  PID:3.1849e+06
                                                                                                                                  • C:\Windows\SysWOW64\net1.exe
                                                                                                                                    C:\Windows\system32\net1 stop "samss" /y
                                                                                                                                    3⤵
                                                                                                                                      PID:3.184924e+06
                                                                                                                                • C:\Windows\explorer.exe
                                                                                                                                  "C:\Windows\explorer.exe"
                                                                                                                                  1⤵
                                                                                                                                    PID:304
                                                                                                                                  • C:\Windows\system32\taskmgr.exe
                                                                                                                                    "C:\Windows\system32\taskmgr.exe" /4
                                                                                                                                    1⤵
                                                                                                                                    • Suspicious behavior: EnumeratesProcesses
                                                                                                                                    • Suspicious behavior: GetForegroundWindowSpam
                                                                                                                                    • Suspicious use of AdjustPrivilegeToken
                                                                                                                                    • Suspicious use of FindShellTrayWindow
                                                                                                                                    • Suspicious use of SendNotifyMessage
                                                                                                                                    PID:1308
                                                                                                                                  • C:\Windows\system32\AUDIODG.EXE
                                                                                                                                    C:\Windows\system32\AUDIODG.EXE 0x44c
                                                                                                                                    1⤵
                                                                                                                                    • Suspicious use of AdjustPrivilegeToken
                                                                                                                                    PID:1724

                                                                                                                                  Network

                                                                                                                                  MITRE ATT&CK Enterprise v6

                                                                                                                                  Replay Monitor

                                                                                                                                  Loading Replay Monitor...

                                                                                                                                  Downloads

                                                                                                                                  • memory/304-67-0x000007FEFBFC1000-0x000007FEFBFC3000-memory.dmp

                                                                                                                                    Filesize

                                                                                                                                    8KB

                                                                                                                                  • memory/1876-54-0x0000000075FC1000-0x0000000075FC3000-memory.dmp

                                                                                                                                    Filesize

                                                                                                                                    8KB