Analysis

  • max time kernel
    298s
  • max time network
    165s
  • platform
    windows7_x64
  • resource
    win7-20231215-en
  • resource tags

    arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-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 14 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Executes dropped EXE 11 IoCs
  • Loads dropped DLL 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 7 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:2036
    • 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:2140
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\f6b62297-b468-4adf-b135-388d3eb83c06" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:2752
      • 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:1720
        • C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe
          "C:\Users\Admin\AppData\Local\Temp\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Loads dropped DLL
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:2520
          • C:\Users\Admin\AppData\Local\664e8c4c-7a99-4789-849e-4e8fbdfdd6eb\build3.exe
            "C:\Users\Admin\AppData\Local\664e8c4c-7a99-4789-849e-4e8fbdfdd6eb\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:788
            • C:\Users\Admin\AppData\Local\664e8c4c-7a99-4789-849e-4e8fbdfdd6eb\build3.exe
              "C:\Users\Admin\AppData\Local\664e8c4c-7a99-4789-849e-4e8fbdfdd6eb\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:984
              • 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:2640
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {3377AEA4-88A3-4212-9DFB-2B0F63334E70} S-1-5-21-928733405-3780110381-2966456290-1000:VTILVGXH\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2992
    • 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 SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:2244
      • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:2324
    • 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 SetThreadContext
      PID:2220
      • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        3⤵
        • Executes dropped EXE
        PID:2264
    • 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 SetThreadContext
      PID:2788
      • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        3⤵
        • Executes dropped EXE
        PID:2768
    • 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 SetThreadContext
      PID:300
      • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        3⤵
        • Executes dropped EXE
        PID:1624
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:2316
  • 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"
    1⤵
    • Creates scheduled task(s)
    PID:1668

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 60fc28a0f7ea8a0e51d09a703ef4376328ca3d1d71e94c4ea282f4b7628d5835
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 344B
        • SHA256 72229acc4371239b950b568b9a9a7355c90549d4e1013c8dae3c4e2ebc7e13fb
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 c03e4d2c426cc7db9b0febfc8af010ee5d0ced497821e1b3a65eb7fc94205e8a
        • MD5 SHA1 SHA512

        build3.exe

        • Path C:\Users\Admin\AppData\Local\664e8c4c-7a99-4789-849e-4e8fbdfdd6eb\build3.exe
        • Size 299KB
        • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
        • MD5 SHA1 SHA512 SSDEEP

        Cab9637.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\Cab9637.tmp
        • Size 45KB
        • SHA256 d1d33f8d3ea0ca2106ab1c966090a2f1bbfd93d8c6f15974f20ef9ff9ea951d8
        • MD5 SHA1 SHA512 SSDEEP

        1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe

        • Path C:\Users\Admin\AppData\Local\f6b62297-b468-4adf-b135-388d3eb83c06\1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9.exe
        • Size 838KB
        • SHA256 1a00b83b89579d21ffdfa114fc9cc74e283807af6bc1261d20e218953f8569a9
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 204KB
        • SHA256 44e0da38c86b39dc15468afc619a073e2b49bd8c324634ddc8a7b24c12a5e650
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 120KB
        • SHA256 04e3b54570a5c4b592b8dca28ad1ce33f237a4c329ebc7188440e9d9eff90217
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 109KB
        • SHA256 adbd069d1a07e878be87fe16084a9d652dd0d195e52c0e7aec9f2b0f0504efe4
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 111KB
        • SHA256 0522a62299203a90d3b3d2366537a5cb44494534f3d51b693a77e4d327fed2d7
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 124KB
        • SHA256 6ba89d7b8037c23f3245d522ca864199017b870cd33a02c8b6fa7710f4203da6
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path \Users\Admin\AppData\Local\664e8c4c-7a99-4789-849e-4e8fbdfdd6eb\build3.exe
        • Size 16KB
        • SHA256 a02dccabbce57586a603ee7c8e7b8b1331c5951344d805133a085c54f8feec8c
        • MD5 SHA1 SHA512 SSDEEP

        memory/300-157-0x0000000000860000-0x0000000000960000-memory.dmp

        memory/788-73-0x0000000000C30000-0x0000000000D30000-memory.dmp

        memory/788-75-0x0000000000220000-0x0000000000224000-memory.dmp

        memory/984-81-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/984-79-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/984-76-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/1720-29-0x0000000002080000-0x0000000002112000-memory.dmp

        memory/1720-27-0x0000000002080000-0x0000000002112000-memory.dmp

        memory/2036-0-0x0000000000300000-0x0000000000392000-memory.dmp

        memory/2036-1-0x0000000000300000-0x0000000000392000-memory.dmp

        memory/2036-2-0x0000000002240000-0x000000000235B000-memory.dmp

        memory/2140-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2140-3-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2140-7-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2140-8-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2140-26-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2220-113-0x0000000000910000-0x0000000000A10000-memory.dmp

        memory/2244-93-0x0000000000932000-0x0000000000942000-memory.dmp

        memory/2520-49-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2520-34-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2520-48-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2520-35-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2520-69-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2520-53-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2520-67-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2520-56-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2520-55-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2788-138-0x0000000000942000-0x0000000000952000-memory.dmp