Analysis

  • max time kernel
    166s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20231215-en
  • resource tags

    arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
  • submitted
    01/01/2024, 15:12

General

  • Target
    a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe
  • Size 740KB
  • Sample240101-sladjafeg6
  • SHA256 a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://zexeq.com/lancer/get.php

Attributes
  • extension

    .hgew

  • offline_id

    Nk8w6hJsuGrE3s2SYWM3ehMUHvjgVRqqgX84dat1

  • payload_url

    http://colisumy.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-iTbDHY13BX Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's price for you is $490. 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: 0780JOsie

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 6 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 5 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\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe
    "C:\Users\Admin\AppData\Local\Temp\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2804
    • C:\Users\Admin\AppData\Local\Temp\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe
      "C:\Users\Admin\AppData\Local\Temp\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2984
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\131e0f81-b4e6-4963-906b-0d0a17e84e86" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:2916
      • C:\Users\Admin\AppData\Local\Temp\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe
        "C:\Users\Admin\AppData\Local\Temp\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2928
        • C:\Users\Admin\AppData\Local\Temp\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe
          "C:\Users\Admin\AppData\Local\Temp\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Loads dropped DLL
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:2832
          • C:\Users\Admin\AppData\Local\5b537875-0b53-41bc-b6ae-4f5065ee0716\build3.exe
            "C:\Users\Admin\AppData\Local\5b537875-0b53-41bc-b6ae-4f5065ee0716\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:1576
            • C:\Users\Admin\AppData\Local\5b537875-0b53-41bc-b6ae-4f5065ee0716\build3.exe
              "C:\Users\Admin\AppData\Local\5b537875-0b53-41bc-b6ae-4f5065ee0716\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:2364
              • 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:3012
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {2FE257DF-25C4-4D2E-B16D-C5AAED0F348A} S-1-5-21-452311807-3713411997-1028535425-1000:OZEMQECW\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2432
    • 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:1688
      • 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:3044
        • 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"
          4⤵
          • Creates scheduled task(s)
          PID:1836
    • 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:1096
      • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        3⤵
        • Executes dropped EXE
        PID:2532

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 015e7444eb0fdf2cae85aef5c1d3d1aee98ed7e692c848ea45bfec3a35ccd821
        • 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 a32d34b996ac6888b457e94c0f8151e2aab663c73a49278dc6d90c6f2f863c0d
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 344B
        • SHA256 d2388c08e5b88137b1936630465986844930b66a106e8a987b87be28874115f5
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 d1af9e3c04ba80ef6e08edadaee646eec0a88aa97e0599f4f8d77ca0fc2d6265
        • MD5 SHA1 SHA512

        a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe

        • Path C:\Users\Admin\AppData\Local\131e0f81-b4e6-4963-906b-0d0a17e84e86\a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46.exe
        • Size 740KB
        • SHA256 a1bd0fa8ada1da0181b8d108ca72a41795b55060613e0182f2cbbc592f857f46
        • MD5 SHA1 SHA512 SSDEEP

        Cab1E1B.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\Cab1E1B.tmp
        • Size 65KB
        • SHA256 c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path \Users\Admin\AppData\Local\5b537875-0b53-41bc-b6ae-4f5065ee0716\build3.exe
        • Size 299KB
        • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
        • MD5 SHA1 SHA512 SSDEEP

        memory/1096-121-0x00000000008F0000-0x00000000009F0000-memory.dmp

        memory/1576-73-0x0000000000C50000-0x0000000000D50000-memory.dmp

        memory/1576-85-0x0000000000220000-0x0000000000224000-memory.dmp

        memory/1576-75-0x0000000000220000-0x0000000000224000-memory.dmp

        memory/1688-98-0x0000000000920000-0x0000000000A20000-memory.dmp

        memory/2364-74-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/2364-78-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/2364-80-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/2804-6-0x0000000002490000-0x0000000002521000-memory.dmp

        memory/2804-1-0x0000000003D80000-0x0000000003E9B000-memory.dmp

        memory/2804-0-0x0000000002490000-0x0000000002521000-memory.dmp

        memory/2832-67-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2832-53-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2832-54-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2832-55-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2832-51-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2832-47-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2832-46-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2832-33-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2832-32-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2984-26-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2984-8-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2984-7-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2984-4-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2984-2-0x000000007EFDE000-0x000000007EFDF000-memory.dmp