Overview

overview

10

Static

static

8

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Analysis

  • max time kernel
    301s
  • max time network
    298s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    23-04-2021 11:24

Sharing

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General

  • Target

    f2e040d2c5fea1fb5e9797f7deff0a63.exe

  • Size

    344KB

  • MD5

    f2e040d2c5fea1fb5e9797f7deff0a63

  • SHA1

    849b7b68625d04f4f9057f29994aa59a58f18060

  • SHA256

    74fa89264f62a68f1f0a24c508b8f203bcbe6be60cb66a711a468d676fa53335

  • SHA512

    73dff4b7b551ba2b942edd778c8c0855a0f16c54519967d75f0ab33c7dcb94f2660dc81730f2207af2341506425491cb4434e8e831257c8845013b9dc5ee27db

Score
10/10
ryukdavediscoveryransomware

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
  • Dave packer 1 IoCs

    Detects executable using a packer named 'Dave' by the community, based on a string at the end.

    dave
  • Executes dropped EXE 3 IoCs
  • Modifies extensions of user files 10 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Loads dropped DLL 18 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • 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.

  • Program crash 4 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistence
  • 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 26 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 47 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f2e040d2c5fea1fb5e9797f7deff0a63.exe
    "C:\Users\Admin\AppData\Local\Temp\f2e040d2c5fea1fb5e9797f7deff0a63.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 SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:788
    • C:\Users\Admin\AppData\Local\Temp\HhunNpCoflan.exe
      "C:\Users\Admin\AppData\Local\Temp\HhunNpCoflan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:1168
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1168 -s 2404
        3⤵
        • Loads dropped DLL
        • Program crash
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        PID:3688
    • C:\Users\Admin\AppData\Local\Temp\RtAMgobkvlan.exe
      "C:\Users\Admin\AppData\Local\Temp\RtAMgobkvlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:1016
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1016 -s 2396
        3⤵
        • Loads dropped DLL
        • Program crash
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        PID:4092
    • C:\Users\Admin\AppData\Local\Temp\fefduPQTilan.exe
      "C:\Users\Admin\AppData\Local\Temp\fefduPQTilan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:948
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 948 -s 2392
        3⤵
        • Loads dropped DLL
        • Program crash
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        PID:5476
    • C:\Windows\SysWOW64\SCHTASKS.exe
      SCHTASKS /CREATE /NP /SC DAILY /TN "PrintFc" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\ZasTm.dll" /ST 10:25 /SD 04/24/2021 /ED 05/01/2021
      2⤵
      • Creates scheduled task(s)
      PID:436
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c "WMIC.exe shadowcopy delete"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2036
      • C:\Windows\SysWOW64\Wbem\WMIC.exe
        WMIC.exe shadowcopy delete
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1576
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c "vssadmin.exe Delete Shadows /all /quiet"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1716
      • C:\Windows\SysWOW64\vssadmin.exe
        vssadmin.exe Delete Shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:1232
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c "bcdedit /set {default} recoveryenabled No & bcdedit /set {default}"
      2⤵
        PID:1504
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /c "bootstatuspolicy ignoreallfailures"
        2⤵
          PID:1688
        • C:\Windows\SysWOW64\icacls.exe
          icacls "C:\*" /grant Everyone:F /T /C /Qÿÿÿ
          2⤵
          • Modifies file permissions
          PID:1920
        • C:\Windows\SysWOW64\icacls.exe
          icacls "D:\*" /grant Everyone:F /T /C /Qÿÿÿ
          2⤵
          • Modifies file permissions
          PID:1512
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2928
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:2836
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:2908
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:1512
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
              2⤵
                PID:1352
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                  3⤵
                    PID:556
                • C:\Windows\SysWOW64\net.exe
                  "C:\Windows\System32\net.exe" stop "samss" /y
                  2⤵
                    PID:3104
                    • C:\Windows\SysWOW64\net1.exe
                      C:\Windows\system32\net1 stop "samss" /y
                      3⤵
                        PID:3132
                    • C:\Windows\SysWOW64\WerFault.exe
                      C:\Windows\SysWOW64\WerFault.exe -u -p 788 -s 2664
                      2⤵
                      • Program crash
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      PID:3864
                  • C:\Windows\system32\vssvc.exe
                    C:\Windows\system32\vssvc.exe
                    1⤵
                    • Suspicious use of AdjustPrivilegeToken
                    PID:524

                  Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

                  Loading Replay Monitor...

                  Downloads

                  • memory/788-63-0x0000000035000000-0x0000000035026000-memory.dmp

                    Filesize

                    152KB

                    Download

                  • memory/788-66-0x00000000002C0000-0x00000000002C1000-memory.dmp

                    Filesize

                    4KB

                    Download

                  • memory/788-67-0x00000000002D0000-0x00000000002F0000-memory.dmp

                    Filesize

                    128KB

                    Download

                  • memory/788-68-0x0000000075551000-0x0000000075553000-memory.dmp

                    Filesize

                    8KB

                    Download

                  • memory/788-60-0x0000000000460000-0x0000000000482000-memory.dmp

                    Filesize

                    136KB

                    Download

                  • memory/948-98-0x0000000000380000-0x00000000003A2000-memory.dmp

                    Filesize

                    136KB

                    Download

                  • memory/1016-86-0x0000000000370000-0x0000000000392000-memory.dmp

                    Filesize

                    136KB

                    Download

                  • memory/1168-73-0x0000000000330000-0x0000000000352000-memory.dmp

                    Filesize

                    136KB

                    Download

                  • memory/3688-132-0x0000000000340000-0x0000000000341000-memory.dmp

                    Filesize

                    4KB

                    Download

                  • memory/3864-148-0x0000000000300000-0x0000000000301000-memory.dmp

                    Filesize

                    4KB

                    Download

                  • memory/4092-139-0x00000000001F0000-0x00000000001F1000-memory.dmp

                    Filesize

                    4KB

                    Download

                  • memory/5476-146-0x00000000001F0000-0x0000000000250000-memory.dmp

                    Filesize

                    384KB

                    Download