Overview

overview

10

Static

static

11898.exe

windows7_x64

8

11898.exe

windows10_x64

10

Analysis

  • max time kernel
    151s
  • max time network
    141s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • submitted
    08/12/2021, 06:20

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General

  • Target

    11898.exe

  • Size

    250KB

  • MD5

    693dec99f9767c1d004f6289065471a0

  • SHA1

    91cd7cd10fd1c075f47b84d97f17cc2c1e92e9ac

  • SHA256

    56dc200341cac71492c374d9251791c60308d96d4387a8bbae999fdb5d841375

  • SHA512

    b98942b9eff9e1a9a4dac0c3a53c76138a471419b68d77513bc8854824b8ddb707ec51344d13fdd659f9707985efee7f1b9669e357987d9e65382e76fa6f34c1

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: 1FB-304-6A2 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
  • 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 45 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\11898.exe
    "C:\Users\Admin\AppData\Local\Temp\11898.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3148
    • 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:1864
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe" -start
        3⤵
        • Executes dropped EXE
        • Enumerates connected drives
        • Suspicious use of WriteProcessMemory
        PID:1260
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1496
          • C:\Windows\SysWOW64\Wbem\WMIC.exe
            wmic shadowcopy delete
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1688
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
          4⤵
            PID:1488
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
            4⤵
              PID:1560
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
              4⤵
                PID:1072
              • 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:664
                • 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:1788
                • C:\Windows\SysWOW64\Wbem\WMIC.exe
                  WMIC.exe shadowcopy delete /nointeractive
                  5⤵
                  • Suspicious use of AdjustPrivilegeToken
                  PID:3100
              • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe
                "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe" -agent 0
                4⤵
                • Executes dropped EXE
                • Modifies extensions of user files
                • Drops file in Program Files directory
                PID:1832
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:596
                • C:\Windows\SysWOW64\vssadmin.exe
                  vssadmin delete shadows /all /quiet
                  5⤵
                  • Interacts with shadow copies
                  PID:1528
            • C:\Windows\SysWOW64\notepad.exe
              notepad.exe
              3⤵
                PID:2228
          • C:\Windows\system32\vssvc.exe
            C:\Windows\system32\vssvc.exe
            1⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1884

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/1788-150-0x0000000007D10000-0x0000000007D11000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-163-0x0000000009A50000-0x0000000009A51000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-168-0x0000000004BF3000-0x0000000004BF4000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-166-0x0000000004A10000-0x0000000004A11000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-143-0x0000000004A10000-0x0000000004A11000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-144-0x0000000004A10000-0x0000000004A11000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-145-0x0000000004C00000-0x0000000004C01000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-146-0x00000000075D0000-0x00000000075D1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-147-0x0000000004BF0000-0x0000000004BF1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-148-0x0000000004BF2000-0x0000000004BF3000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-149-0x0000000007C70000-0x0000000007C71000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-151-0x0000000007E80000-0x0000000007E81000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-162-0x0000000009420000-0x0000000009421000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-156-0x0000000004A10000-0x0000000004A11000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-153-0x00000000082B0000-0x00000000082B1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-154-0x0000000008430000-0x0000000008431000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-155-0x0000000008720000-0x0000000008721000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-152-0x0000000007F20000-0x0000000007F21000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-160-0x00000000094B0000-0x00000000094B1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/1788-161-0x00000000087E0000-0x00000000087E1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/2228-123-0x0000000000BA0000-0x0000000000BA1000-memory.dmp

            Filesize

            4KB

            Download