Overview

overview

10

Static

static

imposter11.exe

windows7_x64

10

imposter11.exe

windows10_x64

10

Analysis

  • max time kernel
    110s
  • max time network
    110s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    18/12/2020, 13:49

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General

  • Target
    imposter11.exe
  • Size 446KB
  • Sample201218-n9e77eppc2
  • SHA256 54f6ec27eb7526c439d33e7592e4864842fccf950d828fe14ef7c8eb080ee371
  • MD5 SHA1 SHA512
Score
10/10
buranpersistenceransomware

Malware Config

Extracted

Path

  • C:\!!! HOW TO BACK YOUR FILES !!!.TXT

  • buran

Ransom Note
  • YOUR FILES ARE ENCRYPTED !!! TO DECRYPT, FOLLOW THE INSTRUCTIONS: To recover data you need decrypt tool. To get the decrypt tool you should: 1.In the letter include your personal ID! Send me this ID in your first email to me! 2.We can give you free test for decrypt few files (NOT VALUE) and assign the price for decryption all files! 3.After we send you instruction how to pay for decrypt tool and after payment you will receive a decryption tool! 4.We can decrypt few files in quality the evidence that we have the decoder. DO NOT TRY TO DO SOMETHING WITH YOUR FILES BY YOURSELF YOU WILL BRAKE YOUR DATA !!! ONLY WE ARE CAN HELP YOU! CONTACT US: [email protected] ATTENTION !!! THIS IS YOUR PERSONAL ID WICH YOU HAVE TO SEND IN FIRST LETTER: Your personal ID: 8E5-AA3-C3C 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.

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
  • Modifies extensions of user files 3 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • 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 25683 IoCs
  • Drops file in Windows directory 1 IoCs
  • Interacts with shadow copies 2 TTPs 2 IoCs

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

    ransomware
  • Suspicious use of AdjustPrivilegeToken 89 IoCs
  • Suspicious use of WriteProcessMemory 42 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\imposter11.exe
    "C:\Users\Admin\AppData\Local\Temp\imposter11.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:64
    • 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:2684
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1380
        • C:\Windows\SysWOW64\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3064
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
        3⤵
          PID:2968
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
          3⤵
            PID:3808
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
            3⤵
              PID:1504
            • 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:488
              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                wmic shadowcopy delete
                4⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:2296
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin delete shadows /all /quiet
                4⤵
                • Interacts with shadow copies
                PID:3988
            • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe
              "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe" -agent 0
              3⤵
              • Executes dropped EXE
              • Modifies extensions of user files
              • Drops file in Program Files directory
              • Drops file in Windows directory
              PID:504
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:1080
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin delete shadows /all /quiet
                4⤵
                • Interacts with shadow copies
                PID:4064
            • C:\Windows\SysWOW64\notepad.exe
              notepad.exe
              3⤵
                PID:416
          • C:\Windows\system32\vssvc.exe
            C:\Windows\system32\vssvc.exe
            1⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2832

          Network

                MITRE ATT&CK Enterprise v6

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                Downloads

                memory/416-45-0x00000000001B0000-0x00000000001B1000-memory.dmp
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