Overview

overview

10

Static

static

kIugJm.exe

windows7_x64

10

kIugJm.exe

windows10_x64

10

Analysis

  • max time kernel
    98s
  • max time network
    113s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    09/08/2021, 18:03

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General

  • Target
    kIugJm.exe
  • Size 406KB
  • Sample210809-vbbpf1rv52
  • SHA256 43812b98e4f9480d25b426a23a7b4d2a4e498110545c7a3cb21159bf75c18e7b
  • 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] Reserved email: [email protected] Your personal ID: 3B4-DD9-1B8 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 1 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • 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 64 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • 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 use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 48 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\kIugJm.exe
    "C:\Users\Admin\AppData\Local\Temp\kIugJm.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3156
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\lsass.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\lsass.exe" -start
      2⤵
      • Executes dropped EXE
      • Enumerates connected drives
      • Suspicious use of WriteProcessMemory
      PID:220
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4016
        • C:\Windows\SysWOW64\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1840
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
        3⤵
          PID:2976
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
          3⤵
            PID:2364
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
            3⤵
              PID:504
            • 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:2732
              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                wmic shadowcopy delete
                4⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:4008
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin delete shadows /all /quiet
                4⤵
                • Interacts with shadow copies
                PID:4028
            • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\lsass.exe
              "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\lsass.exe" -agent 0
              3⤵
              • Executes dropped EXE
              • Modifies extensions of user files
              • Drops file in Program Files directory
              • Drops file in Windows directory
              PID:3856
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:3980
              • C:\Windows\SysWOW64\vssadmin.exe
                vssadmin delete shadows /all /quiet
                4⤵
                • Interacts with shadow copies
                PID:3268
            • C:\Windows\SysWOW64\notepad.exe
              notepad.exe
              3⤵
                PID:3828
            • C:\Windows\SysWOW64\notepad.exe
              notepad.exe
              2⤵
              • Deletes itself
              PID:192
          • C:\Windows\system32\vssvc.exe
            C:\Windows\system32\vssvc.exe
            1⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:660

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                memory/192-123-0x0000000000380000-0x0000000000381000-memory.dmp
                Download

                memory/220-122-0x0000000000D00000-0x0000000000E44000-memory.dmp
                Download

                memory/3156-114-0x0000000000A00000-0x0000000000B44000-memory.dmp
                Download

                memory/3156-115-0x0000000000400000-0x000000000054B000-memory.dmp
                Download

                memory/3856-142-0x0000000000D00000-0x0000000000E44000-memory.dmp
                Download