Analysis

  • max time kernel
    297s
  • max time network
    300s
  • 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, 05:00

General

  • Target
    fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe
  • Size 832KB
  • Sample240115-fnhfpsagg4
  • SHA256 fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://zexeq.com/test1/get.php

Attributes
  • extension

    .cdwe

  • offline_id

    dSwr1XNNi5cIitB5eDPbMANcusB1dWGDB8ToUnt1

  • payload_url

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

    http://zexeq.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-e21iz7dS58 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: 0842ASdw

rsa_pubkey.plain

Signatures

  • Detect Vidar Stealer 5 IoCs
  • Detected Djvu ransomware 16 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Downloads MZ/PE file
  • Executes dropped EXE 2 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 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe
    "C:\Users\Admin\AppData\Local\Temp\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2980
    • C:\Users\Admin\AppData\Local\Temp\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe
      "C:\Users\Admin\AppData\Local\Temp\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3656
      • C:\Users\Admin\AppData\Local\Temp\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe
        "C:\Users\Admin\AppData\Local\Temp\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3540
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\df201177-d6f1-403d-82c6-f32c0a856607" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:4744
  • C:\Users\Admin\AppData\Local\Temp\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe
    "C:\Users\Admin\AppData\Local\Temp\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe" --Admin IsNotAutoStart IsNotTask
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2956
    • C:\Users\Admin\AppData\Local\27ab44ae-40f5-4f60-bf99-3ac58bc09a89\build2.exe
      "C:\Users\Admin\AppData\Local\27ab44ae-40f5-4f60-bf99-3ac58bc09a89\build2.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:3856
  • C:\Users\Admin\AppData\Local\27ab44ae-40f5-4f60-bf99-3ac58bc09a89\build2.exe
    "C:\Users\Admin\AppData\Local\27ab44ae-40f5-4f60-bf99-3ac58bc09a89\build2.exe"
    1⤵
    • Executes dropped EXE
    PID:2988
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2988 -s 2040
      2⤵
      • Program crash
      PID:3676

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 4f260fc725d0e8dad1707964503ab9abb6c7875a3de8cffe90d572f772bf98c4
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 39720551284c236816ee58482891e249769855ea82ad359d40dff9179a165bb6
        • MD5 SHA1 SHA512

        build2.exe

        • Path C:\Users\Admin\AppData\Local\27ab44ae-40f5-4f60-bf99-3ac58bc09a89\build2.exe
        • Size 41KB
        • SHA256 0ac095a964fa6d2e8c6cd15e014792cbb99df1995ce368b04d091a5fc9c6b6b8
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\27ab44ae-40f5-4f60-bf99-3ac58bc09a89\build2.exe
        • Size 33KB
        • SHA256 13c60a54b695c2e13b21f95ea38198f8294b8c9561117bd0981b68bd6ca805c1
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\27ab44ae-40f5-4f60-bf99-3ac58bc09a89\build2.exe
        • Size 27KB
        • SHA256 6beccacecf877202e84b0565fccaf77bc6075b83fe009d9238aa59ac64f523c3
        • MD5 SHA1 SHA512 SSDEEP

        fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe

        • Path C:\Users\Admin\AppData\Local\df201177-d6f1-403d-82c6-f32c0a856607\fadf10b3ec4fd1bdc37866d4c5d2a9816d2a7541bc213ed0a123cb427ddbd581.exe
        • Size 115KB
        • SHA256 08f08c53c8388a075cb7ba93f5336d5827b525da351c24a4706d9aeedf72dd71
        • MD5 SHA1 SHA512 SSDEEP

        memory/2956-30-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-46-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-22-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-23-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-58-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-54-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-56-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-29-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-57-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2956-24-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2980-51-0x00000000020C0000-0x0000000002160000-memory.dmp

        memory/2980-4-0x00000000020C0000-0x0000000002160000-memory.dmp

        memory/2980-3-0x0000000002220000-0x000000000233B000-memory.dmp

        memory/2988-52-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/2988-45-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/2988-44-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/2988-39-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/3540-20-0x0000000002070000-0x000000000210C000-memory.dmp

        memory/3656-6-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3656-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3656-1-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3656-2-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3656-17-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3856-42-0x00000000020F0000-0x000000000213B000-memory.dmp

        memory/3856-40-0x0000000000590000-0x0000000000690000-memory.dmp