Analysis

  • max time kernel
    146s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/06/2023, 04:24

General

  • Target
    c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe
  • Size 779KB
  • Sample230605-e1t5laeg78
  • SHA256 c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://zexeq.com/test1/get.php

Attributes
  • extension

    .nerz

  • offline_id

    0vTA6MA1m5nzrdffOCJC7YmAa4Lp6YNN8lOJ4mt1

  • 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-vc50LyB2yb 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: 0722JOsie

rsa_pubkey.plain

Extracted

Family
  • vidar

Version
  • 4.1

Botnet
  • 77a63e71a10ee1d81a28b5c866b75922

C2
  • https://steamcommunity.com/profiles/76561199510444991

  • https://t.me/task4manager

Attributes
  • profile_id_v2

    77a63e71a10ee1d81a28b5c866b75922

  • user_agent

    Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36 Edg/112.0.1722.34

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
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • 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).

  • 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.

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of WriteProcessMemory 47 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe
    "C:\Users\Admin\AppData\Local\Temp\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2412
    • C:\Users\Admin\AppData\Local\Temp\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe
      "C:\Users\Admin\AppData\Local\Temp\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4312
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\ad650178-6cd5-4241-be58-311221a28a53" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1008
      • C:\Users\Admin\AppData\Local\Temp\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe
        "C:\Users\Admin\AppData\Local\Temp\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3644
        • C:\Users\Admin\AppData\Local\Temp\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe
          "C:\Users\Admin\AppData\Local\Temp\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Checks computer location settings
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:4100
          • C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build2.exe
            "C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:2704
            • C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build2.exe
              "C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build2.exe"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              PID:1960
          • C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build3.exe
            "C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:4920
            • 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:3380
  • 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:4508
    • 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:3828

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        mozglue.dll

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

        nss3.dll

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

        07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
        • Size 2KB
        • SHA256 e904584bfbd2b92b1b9063f660abbe337c58e623ca78df5107f036d272d66c38
        • MD5 SHA1 SHA512

        B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
        • Size 1KB
        • SHA256 3b247db7937565d22f6455fb744771e14de3380d133192e00a8f5fadf6492bdb
        • MD5 SHA1 SHA512

        07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
        • Size 488B
        • SHA256 53c5a06c8e3645e12b3db427ee369122ee3a595a5d83711b1c91f75c0820ef23
        • MD5 SHA1 SHA512

        B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
        • Size 482B
        • SHA256 a11ea3517559e473190e11737004f03121a1725d1d76d5fcaa3ef579c863fc95
        • MD5 SHA1 SHA512

        build2.exe

        • Path C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build2.exe
        • Size 437KB
        • SHA256 692fe3aca06ef0e1582fcf692dfd0e2e38e1b542368848318e0095a8f85f3d77
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build2.exe
        • Size 437KB
        • SHA256 692fe3aca06ef0e1582fcf692dfd0e2e38e1b542368848318e0095a8f85f3d77
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build2.exe
        • Size 437KB
        • SHA256 692fe3aca06ef0e1582fcf692dfd0e2e38e1b542368848318e0095a8f85f3d77
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build2.exe
        • Size 437KB
        • SHA256 692fe3aca06ef0e1582fcf692dfd0e2e38e1b542368848318e0095a8f85f3d77
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\2448351d-4bdb-414b-894f-6bb1326514a8\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe

        • Path C:\Users\Admin\AppData\Local\ad650178-6cd5-4241-be58-311221a28a53\c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b.exe
        • Size 779KB
        • SHA256 c76dd220d0493e210819c548636d99bd63cd25707cd4bd8b79383cc6315c864b
        • 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/1960-176-0x0000000000400000-0x000000000046A000-memory.dmp

        memory/1960-208-0x0000000061E00000-0x0000000061EF3000-memory.dmp

        memory/1960-278-0x0000000000400000-0x000000000046A000-memory.dmp

        memory/1960-174-0x0000000000400000-0x000000000046A000-memory.dmp

        memory/1960-177-0x0000000000400000-0x000000000046A000-memory.dmp

        memory/1960-277-0x0000000000400000-0x000000000046A000-memory.dmp

        memory/1960-179-0x0000000000400000-0x000000000046A000-memory.dmp

        memory/1960-276-0x0000000000400000-0x000000000046A000-memory.dmp

        memory/2412-134-0x0000000004A20000-0x0000000004B3B000-memory.dmp

        memory/2704-178-0x00000000007A0000-0x00000000007F6000-memory.dmp

        memory/4100-153-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-159-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-152-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-151-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-205-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-281-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-195-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-158-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-194-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4100-192-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4312-137-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4312-138-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4312-147-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4312-136-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4312-135-0x0000000000400000-0x0000000000537000-memory.dmp