Analysis

  • max time kernel
    121s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    07-06-2024 01:36

General

  • Target

    c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe

  • Size

    3.6MB

  • MD5

    131e367009cf014321e7a70e70c4067c

  • SHA1

    4c02332af53519fdae235f804f5144ba9c7e725d

  • SHA256

    c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89

  • SHA512

    3702fefbcf4eab279484359f61d997b7c32d9c77dd9e255a44e96de9373d18b68ff262037494203f181c359aca549020dcfea3db01d11f8f51e224261259f99e

  • SSDEEP

    49152:fWN3Bsjz4Ddee7wE4o40nQaoJab9Xejv2aH0n2EBvnE8/8OhkqdHG22T9d:f6ujz4DdeClnE8f4T

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://t.me/r8z0l

https://steamcommunity.com/profiles/76561199698764354

Attributes
  • user_agent

    Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Signatures

  • Detect Vidar Stealer 1 IoCs
  • Stealc

    Stealc is an infostealer written in C++.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Downloads MZ/PE file
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Checks processor information in registry 2 TTPs 1 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Modifies system certificate store 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe
    "C:\Users\Admin\AppData\Local\Temp\c4c7045103f42bea7bc9afb11433e4f49d767be0d0b28b678a824e5627804b89.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2136
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
      2⤵
      • Checks processor information in registry
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2660
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" & rd /s /q "C:\ProgramData\IJEHCGIJECFI" & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2724
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 10
          4⤵
          • Delays execution with timeout.exe
          PID:1688

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

    Filesize

    70KB

    MD5

    49aebf8cbd62d92ac215b2923fb1b9f5

    SHA1

    1723be06719828dda65ad804298d0431f6aff976

    SHA256

    b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

    SHA512

    bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

    Filesize

    342B

    MD5

    2914e27f5fe3747b122041f7da4d7416

    SHA1

    a3139343cc4073d4066c54bc2ce0d7b17767a0d1

    SHA256

    4ac178bc3458ed3ed8b9f7c598c004799d3f0838199e3dc76b2aa3a3ae4de088

    SHA512

    4d7cd179761d2028127a5b4f0b7b5fb1dd7a752692fb1ba9cfaece6c154287b0c34d40eb910c2ac4d84d43b862ee19719c9b1b09cdf91916b6eb706629dedea6

  • C:\Users\Admin\AppData\Local\Temp\Tar2DCB.tmp

    Filesize

    181KB

    MD5

    4ea6026cf93ec6338144661bf1202cd1

    SHA1

    a1dec9044f750ad887935a01430bf49322fbdcb7

    SHA256

    8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

    SHA512

    6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

  • memory/2136-39-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-6-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-5-0x00000000003A0000-0x00000000003BC000-memory.dmp

    Filesize

    112KB

  • memory/2136-33-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-37-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-7-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-65-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-63-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-61-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-59-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-57-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-55-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-53-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-51-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-49-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-32-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-45-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-43-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-41-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-0-0x00000000742AE000-0x00000000742AF000-memory.dmp

    Filesize

    4KB

  • memory/2136-2-0x0000000004AF0000-0x0000000004BDE000-memory.dmp

    Filesize

    952KB

  • memory/2136-4-0x0000000004CB0000-0x0000000004D7C000-memory.dmp

    Filesize

    816KB

  • memory/2136-47-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-29-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-27-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-25-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-23-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-21-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-20-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-17-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-15-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-13-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-11-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-9-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-66-0x00000000742A0000-0x000000007498E000-memory.dmp

    Filesize

    6.9MB

  • memory/2136-1-0x0000000000930000-0x0000000000CC6000-memory.dmp

    Filesize

    3.6MB

  • memory/2136-35-0x00000000003A0000-0x00000000003B5000-memory.dmp

    Filesize

    84KB

  • memory/2136-3-0x00000000742A0000-0x000000007498E000-memory.dmp

    Filesize

    6.9MB

  • memory/2136-79-0x00000000742A0000-0x000000007498E000-memory.dmp

    Filesize

    6.9MB

  • memory/2660-67-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2660-68-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2660-70-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2660-69-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB