Analysis

  • max time kernel
    146s
  • max time network
    127s
  • platform
    windows10-1703_x64
  • resource
    win10-20230220-en
  • resource tags

    arch:x64arch:x86image:win10-20230220-enlocale:en-usos:windows10-1703-x64system
  • submitted
    26/03/2023, 04:31

General

  • Target
    cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe
  • Size 782KB
  • Sample230326-e5jveshd9t
  • SHA256 cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://zexeq.com/test2/get.php

Attributes
  • extension

    .tywd

  • offline_id

    Yao2o6f5vNghOpgVBhEIA8O96SC5vLcgITgaRMt1

  • payload_url

    http://uaery.top/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-f8UEvx4T0A 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: 0671IsjO

rsa_pubkey.plain

Extracted

Family
  • vidar

Version
  • 3.1

Botnet
  • 00d92484c9b27bc8482a2cc94cacc508

C2
  • https://steamcommunity.com/profiles/76561199472266392

  • https://t.me/tabootalks

  • http://135.181.26.183:80

Attributes
  • profile_id_v2

    00d92484c9b27bc8482a2cc94cacc508

  • user_agent

    Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36 OPR/91.0.4516.79

Signatures

  • 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 4 IoCs
  • Loads dropped DLL 2 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • 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). Likely ransomware behaviour.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of WriteProcessMemory 53 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe
    "C:\Users\Admin\AppData\Local\Temp\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2016
    • C:\Users\Admin\AppData\Local\Temp\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe
      "C:\Users\Admin\AppData\Local\Temp\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2248
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\f3c117f7-b6ec-4bfb-9dfa-f9e18161984b" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:3152
      • C:\Users\Admin\AppData\Local\Temp\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe
        "C:\Users\Admin\AppData\Local\Temp\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5080
        • C:\Users\Admin\AppData\Local\Temp\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe
          "C:\Users\Admin\AppData\Local\Temp\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:4112
          • C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build2.exe
            "C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3700
            • C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build2.exe
              "C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build2.exe"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of WriteProcessMemory
              PID:2848
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build2.exe" & exit
                7⤵
                • Suspicious use of WriteProcessMemory
                PID:4992
                • C:\Windows\SysWOW64\timeout.exe
                  timeout /t 6
                  8⤵
                  • Delays execution with timeout.exe
                  PID:5052
          • C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build3.exe
            "C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3088
            • 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"
              6⤵
              • Creates scheduled task(s)
              PID:1272
  • 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 WriteProcessMemory
    PID:4320
    • 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"
      2⤵
      • Creates scheduled task(s)
      PID:3076

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
        • Size 2KB
        • SHA256 1b703c5ef0e6349372108f3a7a2033a365e50a17e8d7cd278f93e4444f232b71
        • MD5 SHA1 SHA512

        B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
        • Size 1KB
        • SHA256 0a8b65baa91fb423458dd64e067a6009cd4ce9a93c65ac4b448025403ab0ea9c
        • MD5 SHA1 SHA512

        07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
        • Size 488B
        • SHA256 b5c840ac2425a03ce6653af64a7d436197305d6b749655cae2f2b7ffdac29cbe
        • MD5 SHA1 SHA512

        B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
        • Size 482B
        • SHA256 27cbdf89aa842ba9957c4647234ce0001c819c75e812c6bc16c75f744704f688
        • MD5 SHA1 SHA512

        build2.exe

        • Path C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build2.exe
        • Size 299KB
        • SHA256 4240b655ed2af5ae8873b49e2e2d204383b2fd675c21f02527a9a4d9b719cd49
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build2.exe
        • Size 299KB
        • SHA256 4240b655ed2af5ae8873b49e2e2d204383b2fd675c21f02527a9a4d9b719cd49
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build2.exe
        • Size 299KB
        • SHA256 4240b655ed2af5ae8873b49e2e2d204383b2fd675c21f02527a9a4d9b719cd49
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\6a09d6bf-18cf-4c34-aaf3-5d6e347841a7\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe

        • Path C:\Users\Admin\AppData\Local\f3c117f7-b6ec-4bfb-9dfa-f9e18161984b\cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b.exe
        • Size 782KB
        • SHA256 cf16017d52d732eda618772bd374ecde984322b1b27a86d6b607459ec93f8d8b
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        mozglue.dll

        • Path \ProgramData\mozglue.dll
        • Size 593KB
        • SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
        • MD5 SHA1 SHA512 SSDEEP

        nss3.dll

        • Path \ProgramData\nss3.dll
        • Size 2.0MB
        • SHA256 ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
        • MD5 SHA1 SHA512 SSDEEP

        memory/2016-122-0x00000000048E0000-0x00000000049FB000-memory.dmp

        memory/2248-125-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2248-137-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2248-126-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2248-123-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2248-124-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2848-191-0x0000000061E00000-0x0000000061EF3000-memory.dmp

        memory/2848-233-0x0000000000400000-0x000000000046C000-memory.dmp

        memory/2848-168-0x0000000000400000-0x000000000046C000-memory.dmp

        memory/2848-169-0x0000000000400000-0x000000000046C000-memory.dmp

        memory/2848-170-0x0000000000400000-0x000000000046C000-memory.dmp

        memory/2848-252-0x0000000000400000-0x000000000046C000-memory.dmp

        memory/2848-251-0x0000000000400000-0x000000000046C000-memory.dmp

        memory/2848-249-0x0000000000400000-0x000000000046C000-memory.dmp

        memory/2848-165-0x0000000000400000-0x000000000046C000-memory.dmp

        memory/3700-167-0x0000000002130000-0x0000000002187000-memory.dmp

        memory/4112-160-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-147-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-149-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-148-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-180-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-141-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-142-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-176-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-162-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4112-163-0x0000000000400000-0x0000000000537000-memory.dmp