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Analysis

  • max time kernel
    122s
  • max time network
    124s
  • platform
    windows7_x64
  • resource
    win7-20231020-en
  • resource tags

    arch:x64arch:x86image:win7-20231020-enlocale:en-usos:windows7-x64system
  • submitted
    12/11/2023, 16:04

General

  • Target

    dc6c4b3a9db140cefda4564e0c8adda4.exe

  • Size

    240KB

  • MD5

    dc6c4b3a9db140cefda4564e0c8adda4

  • SHA1

    1e6476dd04e9652f9865e983a2b905cc3f8e34e5

  • SHA256

    78380c9b3b9036cb8d3fdbacd2438971115405bcb828bb9812e4abb488408590

  • SHA512

    ff719f7e50b878a0f0903afa67ff365f8972e7ba69b75583f609dedff8c166b437af601e0e304dd2623f55076513c64d2a400a4fe9d598ef63d021921d5fc7eb

  • SSDEEP

    3072:tiyf4PLToR3Py+dWiWiZOegeEsSldc1aOm4DSRP4X4wZ7+c:tbwPLTmPy+dWicvsSQ1a5b4X4wN

Malware Config

Extracted

Family

stealc

C2

http://bernardofata.icu

Attributes
  • url_path

    /40d570f44e84a454.php

rc4.plain

Signatures

  • Stealc

    Stealc is an infostealer written in C++.

  • Downloads MZ/PE file
  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 IoCs
  • 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.

  • 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.

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\dc6c4b3a9db140cefda4564e0c8adda4.exe
    "C:\Users\Admin\AppData\Local\Temp\dc6c4b3a9db140cefda4564e0c8adda4.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\dc6c4b3a9db140cefda4564e0c8adda4.exe" & del "C:\ProgramData\*.dll"" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:3028
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 5
        3⤵
        • Delays execution with timeout.exe
        PID:2068

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • \ProgramData\mozglue.dll

    Filesize

    593KB

    MD5

    c8fd9be83bc728cc04beffafc2907fe9

    SHA1

    95ab9f701e0024cedfbd312bcfe4e726744c4f2e

    SHA256

    ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a

    SHA512

    fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

  • \ProgramData\nss3.dll

    Filesize

    2.0MB

    MD5

    1cc453cdf74f31e4d913ff9c10acdde2

    SHA1

    6e85eae544d6e965f15fa5c39700fa7202f3aafe

    SHA256

    ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5

    SHA512

    dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

  • memory/1948-1-0x0000000000A60000-0x0000000000B60000-memory.dmp

    Filesize

    1024KB

  • memory/1948-2-0x0000000000220000-0x000000000023B000-memory.dmp

    Filesize

    108KB

  • memory/1948-3-0x0000000000400000-0x00000000008A2000-memory.dmp

    Filesize

    4.6MB

  • memory/1948-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

    Filesize

    972KB

  • memory/1948-62-0x0000000000400000-0x00000000008A2000-memory.dmp

    Filesize

    4.6MB

  • memory/1948-72-0x0000000000400000-0x00000000008A2000-memory.dmp

    Filesize

    4.6MB

  • memory/1948-73-0x0000000000A60000-0x0000000000B60000-memory.dmp

    Filesize

    1024KB