Analysis

  • max time kernel
    147s
  • max time network
    139s
  • platform
    windows10-1703_x64
  • resource
    win10-20230703-en
  • resource tags

    arch:x64arch:x86image:win10-20230703-enlocale:en-usos:windows10-1703-x64system
  • submitted
    26/07/2023, 09:40

General

  • Target
    e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe
  • Size 852KB
  • Sample230726-lng3tsaf75
  • SHA256 e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://zexeq.com/raud/get.php

Attributes
  • extension

    .wsuu

  • offline_id

    7X6susBgNzwvmNWz9bMuyhXEUD44D10UNodg0Zt1

  • 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-ujg4QBiBRu 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: 0752Osie

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 16 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Executes dropped EXE 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 2 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 35 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe
    "C:\Users\Admin\AppData\Local\Temp\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:352
    • C:\Users\Admin\AppData\Local\Temp\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe
      "C:\Users\Admin\AppData\Local\Temp\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2716
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\c198e5db-4807-4575-ba29-18aaa3b3adf3" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:4640
      • C:\Users\Admin\AppData\Local\Temp\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe
        "C:\Users\Admin\AppData\Local\Temp\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1348
        • C:\Users\Admin\AppData\Local\Temp\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe
          "C:\Users\Admin\AppData\Local\Temp\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:4796
          • C:\Users\Admin\AppData\Local\1657eb73-4ec0-42d1-a5c5-001b09ff1fce\build3.exe
            "C:\Users\Admin\AppData\Local\1657eb73-4ec0-42d1-a5c5-001b09ff1fce\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            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"
              6⤵
              • Creates scheduled task(s)
              PID:3808
  • 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:4488
    • 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:3900

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
        • Size 2KB
        • SHA256 d62934313eec30d6276854f81ed0ad0fa455c13032f23c49dc5e931e53aa24fd
        • MD5 SHA1 SHA512

        B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
        • Size 1KB
        • SHA256 f29be229662b3201af3c58d4fcccb93da75f9cc44a2b7c2e3086302bb2bc1425
        • MD5 SHA1 SHA512

        07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
        • Size 488B
        • SHA256 d0641d1cc7f27bc8de4387be0a52fc1992610a2a61b47fd07d455c921d92ef36
        • MD5 SHA1 SHA512

        B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
        • Size 482B
        • SHA256 42c6fefedf185f8507eb178ebae3a69f40019e4f31586444ed58c44b82af4754
        • MD5 SHA1 SHA512

        build3.exe

        • Path C:\Users\Admin\AppData\Local\1657eb73-4ec0-42d1-a5c5-001b09ff1fce\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\1657eb73-4ec0-42d1-a5c5-001b09ff1fce\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe

        • Path C:\Users\Admin\AppData\Local\c198e5db-4807-4575-ba29-18aaa3b3adf3\e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c.exe
        • Size 852KB
        • SHA256 e515b5cada95af17780c206b00072c6d2b6ba61bf32db667f9d66a4ceb056b9c
        • 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

        memory/352-121-0x0000000002570000-0x0000000002604000-memory.dmp

        memory/352-122-0x0000000004190000-0x00000000042AB000-memory.dmp

        memory/1348-140-0x00000000040B0000-0x000000000414B000-memory.dmp

        memory/2716-137-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2716-126-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2716-123-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2716-124-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2716-125-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-150-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-156-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-157-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-158-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-142-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-154-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-167-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-144-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-149-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4796-143-0x0000000000400000-0x0000000000537000-memory.dmp