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Overview

overview

10

Static

static

b3846bc61c...27.exe

windows7_x64

10

b3846bc61c...27.exe

windows10_x64

10

Analysis

  • max time kernel
    150s
  • max time network
    69s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    30/03/2021, 09:32

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General

  • Target

    b3846bc61ca63d9c10d6f559688e366061ae98fcbe82076b9e557b0beec6f327.exe

  • Size

    115KB

  • MD5

    d736f4a3fc844b4a7e970b562fbeac85

  • SHA1

    fdd13c9b9e6c0e07f1215780c4ab742627e57917

  • SHA256

    b3846bc61ca63d9c10d6f559688e366061ae98fcbe82076b9e557b0beec6f327

  • SHA512

    7ee0ba7a2df6cc294b9955279bbfbfe7f3e167dc208b7d9290ba67bb0c516b228d1b75c7eeebcdb9090b85e8267d239889c3ad12718a281978a1aa00ad8509fe

Score
10/10
ryukdiscoverypersistenceransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
[email protected] balance of shadow universe Ryuk

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Drops file in Drivers directory 4 IoCs
  • Executes dropped EXE 2 IoCs
  • Modifies extensions of user files 9 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Drops startup file 1 IoCs
  • Loads dropped DLL 4 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Drops file in System32 directory 64 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Interacts with shadow copies 2 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 46 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\taskhost.exe
    "taskhost.exe"
    1⤵
      PID:1144
    • C:\Windows\system32\Dwm.exe
      "C:\Windows\system32\Dwm.exe"
      1⤵
        PID:1196
      • C:\Users\Admin\AppData\Local\Temp\b3846bc61ca63d9c10d6f559688e366061ae98fcbe82076b9e557b0beec6f327.exe
        "C:\Users\Admin\AppData\Local\Temp\b3846bc61ca63d9c10d6f559688e366061ae98fcbe82076b9e557b0beec6f327.exe"
        1⤵
        • Drops file in Drivers directory
        • Modifies extensions of user files
        • Drops startup file
        • Loads dropped DLL
        • Drops file in System32 directory
        • Drops file in Program Files directory
        • Drops file in Windows directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:844
        • C:\Users\Admin\AppData\Local\Temp\EsESICXSElan.exe
          "C:\Users\Admin\AppData\Local\Temp\EsESICXSElan.exe" 8 LAN
          2⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:1300
        • C:\Users\Admin\AppData\Local\Temp\LVeXyXYmtlan.exe
          "C:\Users\Admin\AppData\Local\Temp\LVeXyXYmtlan.exe" 8 LAN
          2⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:316
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:1748
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:572
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:268
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:1928
            • C:\Windows\SysWOW64\cmd.exe
              cmd.exe /c "WMIC.exe shadowcopy delete"
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:940
              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                WMIC.exe shadowcopy delete
                3⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:1520
            • C:\Windows\SysWOW64\cmd.exe
              cmd.exe /c "vssadmin.exe Delete Shadows /all /quiet"
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:784
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin.exe Delete Shadows /all /quiet
                3⤵
                • Interacts with shadow copies
                PID:780
            • C:\Windows\SysWOW64\cmd.exe
              cmd.exe /c "bcdedit /set {default} recoveryenabled No & bcdedit /set {default}"
              2⤵
                PID:612
              • C:\Windows\SysWOW64\cmd.exe
                cmd.exe /c "bootstatuspolicy ignoreallfailures"
                2⤵
                  PID:1268
                • C:\Windows\SysWOW64\icacls.exe
                  icacls "C:\*" /grant Everyone:F /T /C /Qÿ
                  2⤵
                  • Modifies file permissions
                  PID:1392
                • C:\Windows\SysWOW64\icacls.exe
                  icacls "D:\*" /grant Everyone:F /T /C /Qÿ
                  2⤵
                  • Modifies file permissions
                  PID:1856
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "EV" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\b3846bc61ca63d9c10d6f559688e366061ae98fcbe82076b9e557b0beec6f327.exe" /f /reg:64
                  2⤵
                    PID:1904
                    • C:\Windows\SysWOW64\reg.exe
                      REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "EV" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\b3846bc61ca63d9c10d6f559688e366061ae98fcbe82076b9e557b0beec6f327.exe" /f /reg:64
                      3⤵
                      • Adds Run key to start application
                      PID:2480
                  • C:\Windows\SysWOW64\net.exe
                    "C:\Windows\System32\net.exe" stop "samss" /y
                    2⤵
                      PID:1304
                      • C:\Windows\SysWOW64\net1.exe
                        C:\Windows\system32\net1 stop "samss" /y
                        3⤵
                          PID:2244
                      • C:\Windows\SysWOW64\net.exe
                        "C:\Windows\System32\net.exe" stop "samss" /y
                        2⤵
                          PID:46888
                          • C:\Windows\SysWOW64\net1.exe
                            C:\Windows\system32\net1 stop "samss" /y
                            3⤵
                              PID:47088
                          • C:\Windows\SysWOW64\net.exe
                            "C:\Windows\System32\net.exe" stop "samss" /y
                            2⤵
                              PID:55612
                              • C:\Windows\SysWOW64\net1.exe
                                C:\Windows\system32\net1 stop "samss" /y
                                3⤵
                                  PID:55656
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "samss" /y
                                2⤵
                                  PID:108900
                                  • C:\Windows\SysWOW64\net1.exe
                                    C:\Windows\system32\net1 stop "samss" /y
                                    3⤵
                                      PID:109408
                                  • C:\Windows\SysWOW64\net.exe
                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                    2⤵
                                      PID:134932
                                      • C:\Windows\SysWOW64\net1.exe
                                        C:\Windows\system32\net1 stop "samss" /y
                                        3⤵
                                          PID:134960
                                    • C:\Windows\system32\vssvc.exe
                                      C:\Windows\system32\vssvc.exe
                                      1⤵
                                      • Suspicious use of AdjustPrivilegeToken
                                      PID:1612

                                    Network

                                    MITRE ATT&CK Enterprise v6

                                    Replay Monitor

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                                    Downloads

                                    • memory/844-10-0x0000000000380000-0x0000000000381000-memory.dmp

                                      Filesize

                                      4KB

                                      Download

                                    • memory/844-12-0x0000000000380000-0x0000000000381000-memory.dmp

                                      Filesize

                                      4KB

                                      Download

                                    • memory/844-14-0x0000000000380000-0x0000000000381000-memory.dmp

                                      Filesize

                                      4KB

                                      Download

                                    • memory/844-2-0x0000000076881000-0x0000000076883000-memory.dmp

                                      Filesize

                                      8KB

                                      Download