Overview

overview

10

Static

static

cb6e0dcae5...78.exe

windows7_x64

10

cb6e0dcae5...78.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    176s
  • max time network
    205s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    20-02-2022 02:03

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General

  • Target

    cb6e0dcae5a36d4f8bf939b4928708f26453cdef324c205e809b6fec484cf478.exe

  • Size

    123KB

  • MD5

    c22c2847e3318190b9c9f16dc4b044ca

  • SHA1

    c6f8e944701b557a905754551cc939b9c4956bdc

  • SHA256

    cb6e0dcae5a36d4f8bf939b4928708f26453cdef324c205e809b6fec484cf478

  • SHA512

    2f1e14bfd5134760a62db30980b8541ead8ffe1ac244e2699d46b255b36299d0e87aab8281b7a08b0c77a9da45ab7a812cbd42147fcdf00246fe6f4afe251012

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
<html><body><p style="font-weight:bold;font-size:125%;top:0;left:0;"> [email protected] <br> </p><p style="position:absolute;bottom:0;right:1%;font-weight:bold;font-size:170%">balance of shadow universe</p><div style="font-size: 550%;font-weight:bold;width:50%;height:50%;overflow:auto;margin:auto;position:absolute;top:35%;left:40%;">Ryuk</div></body></html�������������������������������������������������������������������������������������������������������������������������������������������������������

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
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • 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.

    persistence
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\cb6e0dcae5a36d4f8bf939b4928708f26453cdef324c205e809b6fec484cf478.exe
    "C:\Users\Admin\AppData\Local\Temp\cb6e0dcae5a36d4f8bf939b4928708f26453cdef324c205e809b6fec484cf478.exe"
    1⤵
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3420
    • C:\Windows\SysWOW64\SCHTASKS.exe
      SCHTASKS /CREATE /NP /SC DAILY /TN "Print6z" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\xnDai.dll" /ST 10:25 /SD 02/21/2022 /ED 02/28/2022
      2⤵
      • Creates scheduled task(s)
      PID:3836
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Qÿ
      2⤵
      • Modifies file permissions
      PID:2952
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Qÿ
      2⤵
      • Modifies file permissions
      PID:3500
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c "bootstatuspolicy ignoreallfailures"
      2⤵
        PID:644
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /c "bcdedit /set {default} recoveryenabled No & bcdedit /set {default}"
        2⤵
          PID:4680
        • C:\Windows\SysWOW64\cmd.exe
          cmd.exe /c "vssadmin.exe Delete Shadows /all /quiet"
          2⤵
            PID:1824
          • C:\Windows\SysWOW64\cmd.exe
            cmd.exe /c "WMIC.exe shadowcopy delete"
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:2956
            • C:\Windows\SysWOW64\Wbem\WMIC.exe
              WMIC.exe shadowcopy delete
              3⤵
                PID:1360

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Initial Access

          Execution

          Scheduled Task

          1
          T1053

          Persistence

          Scheduled Task

          1
          T1053

          Privilege Escalation

          Scheduled Task

          1
          T1053

          Defense Evasion

          File Deletion

          1
          T1107

          File Permissions Modification

          1
          T1222

          Credential Access

          Discovery

          System Information Discovery

          1
          T1082

          Lateral Movement

          Collection

          Exfiltration

          Command and Control

          Impact

          Inhibit System Recovery

          1
          T1490

          Replay Monitor

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          Downloads