Analysis

  • max time kernel
    54s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/12/2022, 08:35

General

  • Target
    4525da518da4d8644df5834756776c7b.exe
  • Size 744KB
  • Sample221224-kg2cfsda2w
  • SHA256 58ffdedad7310d83d66e0ac607d7bd7271be5308adfa48c1a54447bd5c692ff1
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://ex3mall.com/test1/get.php

Attributes
  • extension

    .isal

  • offline_id

    m3KmScxfDyEQzJYP8qjOSfP4FvpsOXlekGuMPzt1

  • payload_url

    http://uaery.top/dl/build2.exe

    http://ex3mall.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-oWam3yYrSr 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: 0620JOsie

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 10 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Executes dropped EXE 4 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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\4525da518da4d8644df5834756776c7b.exe
    "C:\Users\Admin\AppData\Local\Temp\4525da518da4d8644df5834756776c7b.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:960
    • C:\Users\Admin\AppData\Local\Temp\4525da518da4d8644df5834756776c7b.exe
      "C:\Users\Admin\AppData\Local\Temp\4525da518da4d8644df5834756776c7b.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1624
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\6f04ad72-7df6-4f0c-aec5-897c20600851" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:4224
      • C:\Users\Admin\AppData\Local\Temp\4525da518da4d8644df5834756776c7b.exe
        "C:\Users\Admin\AppData\Local\Temp\4525da518da4d8644df5834756776c7b.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3808
        • C:\Users\Admin\AppData\Local\Temp\4525da518da4d8644df5834756776c7b.exe
          "C:\Users\Admin\AppData\Local\Temp\4525da518da4d8644df5834756776c7b.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Checks computer location settings
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3116
          • C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build2.exe
            "C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:4708
            • C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build2.exe
              "C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build2.exe"
              6⤵
              • Executes dropped EXE
              • Checks computer location settings
              • Loads dropped DLL
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of WriteProcessMemory
              PID:4672
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build2.exe" & exit
                7⤵
                • Suspicious use of WriteProcessMemory
                PID:1676
                • C:\Windows\SysWOW64\timeout.exe
                  timeout /t 6
                  8⤵
                  • Delays execution with timeout.exe
                  PID:4276
          • C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build3.exe
            "C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:4492
            • 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:2576
  • 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:1956
    • 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:2640

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        mozglue.dll

        • Path C:\ProgramData\mozglue.dll
        • Size 133KB
        • SHA256 3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
        • MD5 SHA1 SHA512 SSDEEP

        nss3.dll

        • Path C:\ProgramData\nss3.dll
        • Size 1.2MB
        • SHA256 e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
        • MD5 SHA1 SHA512 SSDEEP

        07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
        • Size 2KB
        • SHA256 a2550a47e8dee78c170ecdfc8918137469b6115cf32fedc091b80c7dea2701a1
        • MD5 SHA1 SHA512

        B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
        • Size 1KB
        • SHA256 7d2ba9f4e363368512dc2388d792c3f971d18699234c4edab57ddd4053870026
        • MD5 SHA1 SHA512

        07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
        • Size 488B
        • SHA256 75cf4b2facb532b301e1b93a67876ab9b4b1771023ee2b0391e0a959ed644d6e
        • MD5 SHA1 SHA512

        B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
        • Size 482B
        • SHA256 e153ec3eccd03fd55894dc8d99ffdf6f4fcab4728929397be000daf59620cd4a
        • MD5 SHA1 SHA512

        4525da518da4d8644df5834756776c7b.exe

        • Path C:\Users\Admin\AppData\Local\6f04ad72-7df6-4f0c-aec5-897c20600851\4525da518da4d8644df5834756776c7b.exe
        • Size 744KB
        • SHA256 58ffdedad7310d83d66e0ac607d7bd7271be5308adfa48c1a54447bd5c692ff1
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build2.exe
        • Size 409KB
        • SHA256 027bcfc4c5b4a06371e94f4a6b5f69cbee5bcad651d91115132844a2c10885a1
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build2.exe
        • Size 409KB
        • SHA256 027bcfc4c5b4a06371e94f4a6b5f69cbee5bcad651d91115132844a2c10885a1
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build2.exe
        • Size 409KB
        • SHA256 027bcfc4c5b4a06371e94f4a6b5f69cbee5bcad651d91115132844a2c10885a1
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\b1d758ac-cdbd-4f6b-9f3e-5edbf157fa7e\build3.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/960-137-0x0000000002210000-0x000000000232B000-memory.dmp

        memory/960-135-0x00000000009D1000-0x0000000000A62000-memory.dmp

        memory/1624-142-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1624-138-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1624-136-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1624-134-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1624-133-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3116-168-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3116-145-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3116-147-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3116-148-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3808-146-0x000000000072B000-0x00000000007BC000-memory.dmp

        memory/4672-166-0x0000000000400000-0x0000000000467000-memory.dmp

        memory/4672-169-0x0000000060900000-0x0000000060992000-memory.dmp

        memory/4672-167-0x0000000000400000-0x0000000000467000-memory.dmp

        memory/4672-164-0x0000000000400000-0x0000000000467000-memory.dmp

        memory/4672-191-0x0000000000400000-0x0000000000467000-memory.dmp

        memory/4672-161-0x0000000000400000-0x0000000000467000-memory.dmp

        memory/4708-163-0x00000000006F8000-0x0000000000726000-memory.dmp

        memory/4708-165-0x0000000002080000-0x00000000020D3000-memory.dmp