Analysis

  • max time kernel
    296s
  • max time network
    293s
  • platform
    windows10-1703_x64
  • resource
    win10-20231220-en
  • resource tags

    arch:x64arch:x86image:win10-20231220-enlocale:en-usos:windows10-1703-x64system
  • submitted
    14/01/2024, 22:19

General

  • Target
    4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe
  • Size 758KB
  • Sample240114-18yzeadcgr
  • SHA256 4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b
  • 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

  • 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 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).

  • Program crash 1 IoCs
  • 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\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe
    "C:\Users\Admin\AppData\Local\Temp\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3272
    • C:\Users\Admin\AppData\Local\Temp\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe
      "C:\Users\Admin\AppData\Local\Temp\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2548
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\0a231f5d-4ba9-4851-9660-ecc8071da887" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:4888
      • C:\Users\Admin\AppData\Local\Temp\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe
        "C:\Users\Admin\AppData\Local\Temp\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1940
        • C:\Users\Admin\AppData\Local\Temp\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe
          "C:\Users\Admin\AppData\Local\Temp\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3556
          • C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build2.exe
            "C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3108
            • C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build2.exe
              "C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build2.exe"
              6⤵
              • Executes dropped EXE
              PID:596
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 596 -s 1928
                7⤵
                • Program crash
                PID:2588
          • C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build3.exe
            "C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:4348
            • C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build3.exe
              "C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:3776
              • 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:1596
  • 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:660
    • 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:2452
  • 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:2508
  • 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:2108
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:1940
  • 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:2972
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:1796
  • 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:3904
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:4996

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 0da3f6452b91947ed4ad5e11a34cb348a7da0276e2ee8f8f27d5f3b3987dd1bd
        • 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 6601a819e67ef4cca6d9346fa7b838ac919827e1d93daa3fc2f1338e4ba1349b
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 c9ab1fa28461be0bc14de50fc118b6272100b962105357ba2b766e991fc4ef4c
        • MD5 SHA1 SHA512

        4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe

        • Path C:\Users\Admin\AppData\Local\0a231f5d-4ba9-4851-9660-ecc8071da887\4b9684e393bcb5fb779b00fd025100bca7582a89858ce9344926ff7e3206b90b.exe
        • Size 98KB
        • SHA256 dba07d2a0f30777a3d4737817cab623ad876aee50884b587cccb20f492ed12ca
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build2.exe
        • Size 358KB
        • SHA256 26063c78e5418610471a9f3a00a155d7d1e5b29856e1979ba3bdc42681a871d0
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build2.exe
        • Size 333KB
        • SHA256 3f952ecacf16265de05af3ed7d834da9c0775421d3bef261fab16cb064e9eec9
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build2.exe
        • Size 346KB
        • SHA256 f6ea23e04e7159cff68c49b746187687e5381e321ff13a681138d348f8bb8b62
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build3.exe
        • Size 299KB
        • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\2a41d394-af76-4e4a-9e39-6bd3053f6b1d\build3.exe
        • Size 31KB
        • SHA256 cc0fe5b2e92bd8492b4bee90849c3adce12d982bdbb628edcfb2bded1935945a
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 202KB
        • SHA256 114fe59e6627d8550951bd93cc516b8f453274357396d33b5eaae8227de4823a
        • MD5 SHA1 SHA512 SSDEEP

        memory/596-67-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/596-46-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/596-52-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/596-50-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/660-102-0x0000000000969000-0x0000000000979000-memory.dmp

        memory/1940-20-0x00000000005C0000-0x0000000000656000-memory.dmp

        memory/2108-126-0x0000000000B00000-0x0000000000C00000-memory.dmp

        memory/2548-2-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2548-6-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2548-17-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2548-1-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2548-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2972-154-0x0000000000840000-0x0000000000940000-memory.dmp

        memory/3108-51-0x0000000000810000-0x000000000085B000-memory.dmp

        memory/3108-49-0x0000000000510000-0x0000000000610000-memory.dmp

        memory/3108-70-0x0000000000810000-0x000000000085B000-memory.dmp

        memory/3272-4-0x0000000000790000-0x0000000000827000-memory.dmp

        memory/3272-3-0x00000000021D0000-0x00000000022EB000-memory.dmp

        memory/3272-66-0x0000000000790000-0x0000000000827000-memory.dmp

        memory/3556-24-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-56-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-63-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-30-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-37-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-29-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-23-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-34-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-36-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3556-22-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3776-72-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3776-75-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3776-80-0x0000000000410000-0x00000000004D5000-memory.dmp

        memory/3776-79-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/3904-179-0x0000000000A20000-0x0000000000B20000-memory.dmp

        memory/4348-78-0x0000000000820000-0x0000000000824000-memory.dmp

        memory/4348-76-0x0000000000A19000-0x0000000000A2A000-memory.dmp