Analysis

  • max time kernel
    296s
  • max time network
    261s
  • platform
    windows10-1703_x64
  • resource
    win10-20240221-en
  • resource tags

    arch:x64arch:x86image:win10-20240221-enlocale:en-usos:windows10-1703-x64system
  • submitted
    23/02/2024, 04:48

General

  • Target
    818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe
  • Size 666KB
  • Sample240223-ffgt7sbb61
  • SHA256 818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

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

Attributes
  • extension

    .lkhy

  • offline_id

    OxV6DGl22io8sqMOW1zCCOlzPiv4f1Vqzw7Y8zt1

  • 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. Do not ask assistants from youtube and recovery data sites for help in recovering your data. They can use your free decryption quota and scam you. Our contact is emails in this text document only. You can get and look video overview decrypt tool: https://we.tl/t-uNdL2KHHdy Price of private key and decrypt software is $999. Discount 50% available if you contact us first 72 hours, that's price for you is $499. 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: 0851ASdw

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 18 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Executes dropped EXE 9 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 6 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\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe
    "C:\Users\Admin\AppData\Local\Temp\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:5024
    • C:\Users\Admin\AppData\Local\Temp\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe
      "C:\Users\Admin\AppData\Local\Temp\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4916
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\a2e5b15a-159a-4881-99ca-fa9cc91a789d" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:668
      • C:\Users\Admin\AppData\Local\Temp\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe
        "C:\Users\Admin\AppData\Local\Temp\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1148
        • C:\Users\Admin\AppData\Local\Temp\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe
          "C:\Users\Admin\AppData\Local\Temp\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3716
          • C:\Users\Admin\AppData\Local\bb565c9c-08af-4024-9bc3-a5ba497bcea7\build3.exe
            "C:\Users\Admin\AppData\Local\bb565c9c-08af-4024-9bc3-a5ba497bcea7\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3160
            • C:\Users\Admin\AppData\Local\bb565c9c-08af-4024-9bc3-a5ba497bcea7\build3.exe
              "C:\Users\Admin\AppData\Local\bb565c9c-08af-4024-9bc3-a5ba497bcea7\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:3436
              • 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:4500
  • 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:1320
    • 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:2816
      • 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:1080
  • 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:2716
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:2988
  • 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:4260
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:4396
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    1⤵
    • Executes dropped EXE
    PID:1432

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
        • Size 1KB
        • SHA256 0e3dcc979a1e43003bdc7253cb4094c0385d2099c14dc12a4e85fded6f76dc97
        • 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 fc8d3e0271879a09724d86aeef1717ba07338f087f9dc42c87031fee325d548e
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 4580ee67383393e4042d14c41049d82f17394b270249a0f34064e9f96da1af4a
        • MD5 SHA1 SHA512

        818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe

        • Path C:\Users\Admin\AppData\Local\a2e5b15a-159a-4881-99ca-fa9cc91a789d\818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8.exe
        • Size 666KB
        • SHA256 818e83a6f88f34e7dc343f267a30b651d578a9e9786c95bc2a76ab33d58f74b8
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\bb565c9c-08af-4024-9bc3-a5ba497bcea7\build3.exe
        • Size 299KB
        • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 42KB
        • SHA256 ba107d39e1c2d3ec64a43bbd099dffafbd1727fbd95585a50a40da629cbc5248
        • MD5 SHA1 SHA512 SSDEEP

        memory/1148-20-0x0000000003E90000-0x0000000003F29000-memory.dmp

        memory/1320-76-0x0000000000AD0000-0x0000000000BD0000-memory.dmp

        memory/2716-93-0x0000000000860000-0x0000000000960000-memory.dmp

        memory/2716-106-0x0000000000860000-0x0000000000960000-memory.dmp

        memory/2988-98-0x0000000000410000-0x0000000000411000-memory.dmp

        memory/3160-53-0x0000000000B40000-0x0000000000C40000-memory.dmp

        memory/3160-56-0x00000000009F0000-0x00000000009F4000-memory.dmp

        memory/3436-61-0x0000000000410000-0x00000000004D5000-memory.dmp

        memory/3436-59-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3436-58-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3436-54-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3716-22-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-23-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-37-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-34-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-44-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-46-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-30-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-29-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-24-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3716-36-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4260-116-0x0000000000970000-0x0000000000A70000-memory.dmp

        memory/4396-120-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/4916-17-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4916-6-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4916-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4916-4-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4916-3-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/5024-1-0x0000000003F30000-0x0000000003FC5000-memory.dmp

        memory/5024-2-0x0000000004070000-0x000000000418B000-memory.dmp