Overview

overview

10

Static

static

4f7f151c4b...44.exe

windows7_x64

10

4f7f151c4b...44.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    150s
  • max time network
    136s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    05/03/2022, 16:21

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General

  • Target

    4f7f151c4baa92b192d53da2d3338b7111653ed4bd8e61f6e0696164068f7144.exe

  • Size

    217KB

  • MD5

    cffe48eed73a2006503d1094dd7e07bf

  • SHA1

    2484ea7e8661d7f21aadb7fb4d79748bc7baae73

  • SHA256

    4f7f151c4baa92b192d53da2d3338b7111653ed4bd8e61f6e0696164068f7144

  • SHA512

    959cd0e7ad00e019301747b0eb4f080f1e2227d360f01f6095c7fc2a8876158b1fbe644f9fc5156c290bbf756a62df26244cc3a94f811cdd9f6ef67c422af5eb

Score
10/10
buranpersistenceransomware

Malware Config

Extracted

Path

C:\!!! ALL YOUR FILES ARE ENCRYPTED !!!.TXT

Family

buran

Ransom Note
!!! ALL YOUR FILES ARE ENCRYPTED !!! All your files, documents, photos, databases and other important files are encrypted. You are not able to decrypt it by yourself! The only method of recovering files is to purchase an unique private key. Only we can give you this key and only we can recover your files. To be sure we have the decryptor and it works you can send an email: _______________ and decrypt one file for free. But this file should be of not valuable! Do you really want to restore your files? Write to email: _______________ Reserved email: _______________ Your personal ID: 664-2E4-EF9 Attention! * Do not rename encrypted files. * Do not try to decrypt your data using third party software, it may cause permanent data loss. * Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.
Emails

_______________

_______________

Signatures

  • Buran

    Ransomware-as-a-service based on the VegaLocker family first identified in 2019.

    ransomwareburan
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Enumerates connected drives 3 TTPs 24 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • 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.

  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4f7f151c4baa92b192d53da2d3338b7111653ed4bd8e61f6e0696164068f7144.exe
    "C:\Users\Admin\AppData\Local\Temp\4f7f151c4baa92b192d53da2d3338b7111653ed4bd8e61f6e0696164068f7144.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2564
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe" -start
      2⤵
      • Executes dropped EXE
      • Enumerates connected drives
      • Suspicious use of WriteProcessMemory
      PID:4404
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4316
        • C:\Windows\SysWOW64\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1864
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
        3⤵
          PID:4332
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
          3⤵
            PID:4396
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\~temp001.bat
            3⤵
            • Suspicious use of WriteProcessMemory
            PID:4284
            • C:\Windows\SysWOW64\Wbem\WMIC.exe
              wmic shadowcopy delete
              4⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:3952
          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe" -agent 0
            3⤵
            • Executes dropped EXE
            • Drops file in Program Files directory
            PID:360
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
            3⤵
              PID:4620
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
              3⤵
                PID:4616
            • C:\Windows\SysWOW64\notepad.exe
              notepad.exe
              2⤵
                PID:5076
            • C:\Windows\system32\vssvc.exe
              C:\Windows\system32\vssvc.exe
              1⤵
                PID:3468

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              • memory/5076-132-0x0000000000410000-0x0000000000411000-memory.dmp

                Filesize

                4KB

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