Overview

overview

10

Static

static

1121.exe

windows7_x64

10

1121.exe

windows10_x64

10

Analysis

  • max time kernel
    122s
  • max time network
    122s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • submitted
    07-12-2021 20:33

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General

  • Target

    1121.exe

  • Size

    250KB

  • MD5

    0aa3df1d2561f93d4d083c18a8c87ba2

  • SHA1

    3d38a3b4a0ac1fd5d654dcef12cc5e9f839d2887

  • SHA256

    03c409dda5cccf65e3402743fdbdeeb2247caa83b74ecb9ee4f547bf371fd6bb

  • SHA512

    4181796c8f8b5aa4ec3d2c362e8fb2e473af11d7200abd34b5b022293041e9fa7cf4e6a4e00bf057481e86899115487c55f68d47cc23d8444e166ed063900536

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: [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: 19E-BC8-F53 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 3 IoCs
  • Modifies extensions of user files 2 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.

  • 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 1 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 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 51 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1121.exe
    "C:\Users\Admin\AppData\Local\Temp\1121.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2088
    • C:\Users\Public\Videos\hgfdfds.exe
      "C:\Users\Public\Videos\hgfdfds.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3540
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe" -start
        3⤵
        • Executes dropped EXE
        • Enumerates connected drives
        • Suspicious use of WriteProcessMemory
        PID:4084
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:372
          • C:\Windows\SysWOW64\Wbem\WMIC.exe
            wmic shadowcopy delete
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1440
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
          4⤵
            PID:1204
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
            4⤵
              PID:2640
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
              4⤵
                PID:680
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:736
                • C:\Windows\SysWOW64\vssadmin.exe
                  vssadmin delete shadows /all /quiet
                  5⤵
                  • Interacts with shadow copies
                  PID:3208
              • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe
                "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\taskeng.exe" -agent 0
                4⤵
                • Executes dropped EXE
                • Modifies extensions of user files
                • Drops file in Program Files directory
                • Drops file in Windows directory
                PID:2624
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\~temp001.bat
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:3984
                • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                  powershell.exe -ExecutionPolicy ByPass -Command "Get-WmiObject Win32_Shadowcopy | ForEach-Object {$_.Delete();}"
                  5⤵
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:1328
                • C:\Windows\SysWOW64\Wbem\WMIC.exe
                  WMIC.exe shadowcopy delete /nointeractive
                  5⤵
                  • Suspicious use of AdjustPrivilegeToken
                  PID:1900
              • C:\Windows\SysWOW64\notepad.exe
                notepad.exe
                4⤵
                  PID:3968
              • C:\Windows\SysWOW64\notepad.exe
                notepad.exe
                3⤵
                  PID:3792
            • C:\Windows\system32\vssvc.exe
              C:\Windows\system32\vssvc.exe
              1⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:1716

            Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            • memory/1328-153-0x0000000007390000-0x0000000007391000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-148-0x0000000006E22000-0x0000000006E23000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-163-0x00000000097B0000-0x00000000097B1000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-166-0x0000000002D00000-0x0000000002D01000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-168-0x0000000006E23000-0x0000000006E24000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-161-0x0000000008E90000-0x0000000008E91000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-143-0x0000000002D00000-0x0000000002D01000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-160-0x00000000091C0000-0x00000000091C1000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-156-0x0000000002D00000-0x0000000002D01000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-155-0x0000000008250000-0x0000000008251000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-154-0x0000000008180000-0x0000000008181000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-144-0x0000000002D00000-0x0000000002D01000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-152-0x0000000007B00000-0x0000000007B01000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-151-0x0000000007A90000-0x0000000007A91000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-150-0x00000000073C0000-0x00000000073C1000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-149-0x0000000007040000-0x0000000007041000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-162-0x0000000009120000-0x0000000009121000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-147-0x0000000006E20000-0x0000000006E21000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-146-0x0000000007460000-0x0000000007461000-memory.dmp

              Filesize

              4KB

              Download

            • memory/1328-145-0x00000000046A0000-0x00000000046A1000-memory.dmp

              Filesize

              4KB

              Download

            • memory/3792-124-0x0000000000800000-0x0000000000801000-memory.dmp

              Filesize

              4KB

              Download

            • memory/3968-195-0x0000000000820000-0x0000000000821000-memory.dmp

              Filesize

              4KB

              Download