Overview

overview

10

Static

static

ayx7IazDUI.scr

windows7_x64

10

ayx7IazDUI.scr

windows10_x64

10

Analysis

  • max time kernel
    150s
  • max time network
    129s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    14/12/2020, 19:50

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General

  • Target
    ayx7IazDUI.scr
  • Size 449KB
  • Sample201214-hhzsfbpl7x
  • SHA256 438d83a22ed38bb2241a99b96d644826522b28327f63055840ee7632d8e95cd8
  • MD5 SHA1 SHA512
Score
10/10
buranpersistenceransomware

Malware Config

Extracted

Path

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

  • 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: [email protected] 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: [email protected] Reserved email: [email protected] Your personal ID: 224-F22-B81 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
  • Deletes itself 1 IoCs
  • 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.

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in Program Files directory 18128 IoCs
  • Interacts with shadow copies 2 TTPs 2 IoCs

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

    ransomware
  • Modifies system certificate store 2 TTPs 2 IoCs
    evasionspywaretrojan
  • Suspicious behavior: EnumeratesProcesses 7438 IoCs
  • Suspicious use of AdjustPrivilegeToken 89 IoCs
  • Suspicious use of WriteProcessMemory 42 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ayx7IazDUI.scr
    "C:\Users\Admin\AppData\Local\Temp\ayx7IazDUI.scr" /S
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:640
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe" -start
      2⤵
      • Executes dropped EXE
      • Enumerates connected drives
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:940
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2820
        • C:\Windows\SysWOW64\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3336
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
        3⤵
          PID:2232
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
          3⤵
            PID:3856
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
            3⤵
              PID:3840
            • 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:1696
              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                wmic shadowcopy delete
                4⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:684
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin delete shadows /all /quiet
                4⤵
                • Interacts with shadow copies
                PID:3292
            • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe
              "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe" -agent 0
              3⤵
              • Executes dropped EXE
              • Drops file in Program Files directory
              PID:3912
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:3924
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin delete shadows /all /quiet
                4⤵
                • Interacts with shadow copies
                PID:2312
          • C:\Windows\SysWOW64\notepad.exe
            notepad.exe
            2⤵
            • Deletes itself
            PID:1776
        • C:\Windows\system32\vssvc.exe
          C:\Windows\system32\vssvc.exe
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3704

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              memory/1776-5-0x0000000000130000-0x0000000000131000-memory.dmp
              Download