Analysis

  • max time kernel
    299s
  • max time network
    305s
  • platform
    windows10-1703_x64
  • resource
    win10-20231215-en
  • resource tags

    arch:x64arch:x86image:win10-20231215-enlocale:en-usos:windows10-1703-x64system
  • submitted
    15/01/2024, 04:48

General

  • Target
    1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe
  • Size 838KB
  • Sample240115-ffls6aaeh2
  • SHA256 1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://habrafa.com/test1/get.php

Attributes
  • extension

    .cdpo

  • offline_id

    Bn3q97hwLouKbhkQRNO4SeV07gjdEQVm8NKhg0t1

  • payload_url

    http://brusuax.com/dl/build2.exe

    http://habrafa.com/files/1/build3.exe

  • ransomnote

    ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. You can get and look video overview decrypt tool: https://we.tl/t-FCWSCsjEWS Price of private key and decrypt software is $1999. Discount 50% available if you contact us first 72 hours, that's price for you is $999. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: 0844OSkw

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 21 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Executes dropped EXE 12 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 3 IoCs

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

  • Suspicious use of SetThreadContext 8 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe
    "C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3784
    • C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe
      "C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4856
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\9213a82c-40b6-4851-a48f-a31ca9d49ee3" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:64
      • C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe
        "C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3480
        • C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe
          "C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:4120
          • C:\Users\Admin\AppData\Local\956d832f-550f-48bf-9e80-4f40dffc3912\build3.exe
            "C:\Users\Admin\AppData\Local\956d832f-550f-48bf-9e80-4f40dffc3912\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:1432
            • C:\Users\Admin\AppData\Local\956d832f-550f-48bf-9e80-4f40dffc3912\build3.exe
              "C:\Users\Admin\AppData\Local\956d832f-550f-48bf-9e80-4f40dffc3912\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:3468
              • C:\Windows\SysWOW64\schtasks.exe
                /C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"
                7⤵
                • Creates scheduled task(s)
                PID:5112
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2924
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:4520
      • C:\Windows\SysWOW64\schtasks.exe
        /C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"
        3⤵
        • Creates scheduled task(s)
        PID:3208
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:632
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:2772
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4600
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:3584
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    PID:4828
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:3500
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    PID:2216
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:3336

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
        • Size 1KB
        • SHA256 ee8aeed77dd9f1631fa75845214d75bfe04951a61892410ee369035e13fd14c6
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 724B
        • SHA256 58f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5
        • MD5 SHA1 SHA512

        24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
        • Size 410B
        • SHA256 a6b9345209b4638d4ed95d6f55cccbb974ee2ceeac34a778791c9595dbdfed35
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 d520b65b9a91c14309fd46ea72712049728227c38e9c1c672f48662563662675
        • MD5 SHA1 SHA512

        1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe

        • Path C:\Users\Admin\AppData\Local\9213a82c-40b6-4851-a48f-a31ca9d49ee3\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe
        • Size 838KB
        • SHA256 1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\956d832f-550f-48bf-9e80-4f40dffc3912\build3.exe
        • Size 299KB
        • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
        • MD5 SHA1 SHA512 SSDEEP

        memory/632-86-0x0000000000A50000-0x0000000000B50000-memory.dmp

        memory/1432-51-0x0000000000850000-0x0000000000854000-memory.dmp

        memory/1432-49-0x0000000000950000-0x0000000000A50000-memory.dmp

        memory/2216-148-0x0000000000990000-0x0000000000A90000-memory.dmp

        memory/2924-65-0x0000000000B60000-0x0000000000C60000-memory.dmp

        memory/3468-54-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3468-48-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3468-56-0x0000000000410000-0x00000000004D5000-memory.dmp

        memory/3468-53-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3480-21-0x0000000002400000-0x000000000249E000-memory.dmp

        memory/3784-1-0x00000000025B0000-0x0000000002647000-memory.dmp

        memory/3784-2-0x0000000002680000-0x000000000279B000-memory.dmp

        memory/4120-22-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-23-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-38-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-36-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-45-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-34-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-30-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-29-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-24-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4120-37-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4600-108-0x00000000009B0000-0x0000000000AB0000-memory.dmp

        memory/4828-127-0x0000000000AC0000-0x0000000000BC0000-memory.dmp

        memory/4856-17-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4856-6-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4856-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4856-4-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4856-3-0x0000000000400000-0x0000000000537000-memory.dmp