Analysis

  • max time kernel
    121s
  • max time network
    144s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    14-06-2024 01:41

General

  • Target

    9fd04eb7256cd879dc38ea0765ffc538b89e708ba30250f23d947c3713f97885.exe

  • Size

    368KB

  • MD5

    bf808afcc221165140ff57a5e31bdef2

  • SHA1

    64f4ddd4a0f8cde10c990e6167fefb95a311ccec

  • SHA256

    9fd04eb7256cd879dc38ea0765ffc538b89e708ba30250f23d947c3713f97885

  • SHA512

    d1521cd2ca9e064a08f4252bd82c0b6c97c464c49cd327a201d085107201e9cac02a9b311e042e79ee1eddee482975afea1ef0682e2c8bbd74e1415f23cbe1cf

  • SSDEEP

    3072:VUrql9LC/xRNNWY+/BFsiLMcOQlBDQiOKehsPsPn0ScNMvlL+l0A+5NnpINCfh1:VUraLC/xRPO/BmjJQlNKhskHcwL+W/b

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://t.me/memve4erin

https://steamcommunity.com/profiles/76561199699680841

Attributes
  • user_agent

    Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:129.0) Gecko/20100101 Firefox/129.0

Extracted

Family

systembc

C2

173.211.46.4:4299

127.0.0.1:4299

Signatures

  • Detect Vidar Stealer 6 IoCs
  • Stealc

    Stealc is an infostealer written in C++.

  • SystemBC

    SystemBC is a proxy and remote administration tool first seen in 2019.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Detect binaries embedding considerable number of MFA browser extension IDs. 4 IoCs
  • Detect binaries embedding considerable number of cryptocurrency wallet browser extension IDs. 4 IoCs
  • Detects Windows executables referencing non-Windows User-Agents 5 IoCs
  • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 4 IoCs
  • Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion 5 IoCs
  • Detects executables containing potential Windows Defender anti-emulation checks 5 IoCs
  • Downloads MZ/PE file
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 4 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • 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
  • 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.

  • 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 3 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9fd04eb7256cd879dc38ea0765ffc538b89e708ba30250f23d947c3713f97885.exe
    "C:\Users\Admin\AppData\Local\Temp\9fd04eb7256cd879dc38ea0765ffc538b89e708ba30250f23d947c3713f97885.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2044
    • C:\ProgramData\BKKJKFBKKE.exe
      "C:\ProgramData\BKKJKFBKKE.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      PID:2064
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\9fd04eb7256cd879dc38ea0765ffc538b89e708ba30250f23d947c3713f97885.exe" & rd /s /q "C:\ProgramData\JEGHJDGIJECG" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:840
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 10
        3⤵
        • Delays execution with timeout.exe
        PID:2824

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\Content\F0ACCF77CDCBFF39F6191887F6D2D357

    Filesize

    1KB

    MD5

    a266bb7dcc38a562631361bbf61dd11b

    SHA1

    3b1efd3a66ea28b16697394703a72ca340a05bd5

    SHA256

    df545bf919a2439c36983b54cdfc903dfa4f37d3996d8d84b4c31eec6f3c163e

    SHA512

    0da8ef4f8f6ed3d16d2bc8eb816b9e6e1345dfe2d91160196c47e6149a1d6aedaafadcefd66acdea7f72dcf0832770192ceac15b0c559c4ccc2c0e5581d5aefc

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\F0ACCF77CDCBFF39F6191887F6D2D357

    Filesize

    242B

    MD5

    6777c6eb394b0c2166be9517957d3197

    SHA1

    3e26e4e126c4f384b22429797d9f4596140f7750

    SHA256

    165f7aeee32ef98561b07c2ab8269c17a097a0eace32741ab6243c494bf42a01

    SHA512

    a2d0cf9adaafb41f80be812de48932b69cf58ff41ed969994204de4a31afd25c72ee7bef7077c778f739b3003a313606c987f2866be83b40036efb34e9d5e565

  • C:\Users\Admin\AppData\Local\Temp\Tar19FB.tmp

    Filesize

    181KB

    MD5

    4ea6026cf93ec6338144661bf1202cd1

    SHA1

    a1dec9044f750ad887935a01430bf49322fbdcb7

    SHA256

    8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

    SHA512

    6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

  • \ProgramData\BKKJKFBKKE.exe

    Filesize

    7KB

    MD5

    557331587055f884e301b299883620ec

    SHA1

    cff40f1845dc2749fe352a280808d08c468b9a0e

    SHA256

    cd83bbe57e977043d1ec53f43cc9f879c5b37944a8586cfad729e10e6d596d0d

    SHA512

    2e5fdec1b587b4745da169177b47c20b9ab91e45637b227998f907f3a303a00eaf4bfb71165e898b3d2de603739cc46c226cefacbef208416acff67f1d3f9b08

  • memory/2044-416-0x0000000000400000-0x0000000002378000-memory.dmp

    Filesize

    31.5MB

  • memory/2044-1-0x0000000000270000-0x0000000000370000-memory.dmp

    Filesize

    1024KB

  • memory/2044-226-0x000000001E1C0000-0x000000001E41F000-memory.dmp

    Filesize

    2.4MB

  • memory/2044-3-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2044-613-0x0000000000270000-0x0000000000370000-memory.dmp

    Filesize

    1024KB

  • memory/2044-2-0x0000000002380000-0x00000000023B5000-memory.dmp

    Filesize

    212KB

  • memory/2044-674-0x0000000000400000-0x0000000002378000-memory.dmp

    Filesize

    31.5MB

  • memory/2044-746-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2044-745-0x0000000000400000-0x0000000002378000-memory.dmp

    Filesize

    31.5MB

  • memory/2044-747-0x0000000000270000-0x0000000000370000-memory.dmp

    Filesize

    1024KB