Analysis

  • max time kernel
    118s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20231020-en
  • resource tags

    arch:x64arch:x86image:win7-20231020-enlocale:en-usos:windows7-x64system
  • submitted
    22/10/2023, 21:26

General

  • Target

    file.exe

  • Size

    179KB

  • MD5

    47f987b03e24da52bfebfde931100fd0

  • SHA1

    9e3bab845efc3c82d28f016582dd2261b1213109

  • SHA256

    3ec9c6f702632d0576786567b7cb5756a7de4c77e200dd0b744dc0e32f3e5ddf

  • SHA512

    02f7bec413f6288a54ee1390a623e24f0831e4497fbf83d505af2c31898ad6829751833c97e2ec604fd055eed093be14abf5a887766cc8150a1b752c6e6e66c7

  • SSDEEP

    3072:9fyBN6fnr6AMsGrPxVCfRF7XN8wZAgjNyeaEBX:9O2+AM/rPfoRNXSwZbjYe

Malware Config

Extracted

Family

stealc

C2

http://wy�ttsebastian.top

Attributes
  • url_path

    /e9c345fc99a4e67e.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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2560
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\file.exe" & del "C:\ProgramData\*.dll"" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2184
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 5
        3⤵
        • Delays execution with timeout.exe
        PID:1968

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

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/2560-4-0x00000000008F0000-0x00000000009F0000-memory.dmp

    Filesize

    1024KB

  • memory/2560-1-0x00000000008F0000-0x00000000009F0000-memory.dmp

    Filesize

    1024KB

  • memory/2560-5-0x0000000000400000-0x00000000007B6000-memory.dmp

    Filesize

    3.7MB

  • memory/2560-6-0x0000000000220000-0x000000000023B000-memory.dmp

    Filesize

    108KB

  • memory/2560-8-0x0000000000400000-0x00000000007B6000-memory.dmp

    Filesize

    3.7MB

  • memory/2560-9-0x0000000061E00000-0x0000000061EF3000-memory.dmp

    Filesize

    972KB

  • memory/2560-3-0x0000000000400000-0x00000000007B6000-memory.dmp

    Filesize

    3.7MB

  • memory/2560-2-0x0000000000220000-0x000000000023B000-memory.dmp

    Filesize

    108KB

  • memory/2560-68-0x0000000000400000-0x00000000007B6000-memory.dmp

    Filesize

    3.7MB

  • memory/2560-70-0x0000000000400000-0x00000000007B6000-memory.dmp

    Filesize

    3.7MB

  • memory/2560-72-0x0000000000400000-0x00000000007B6000-memory.dmp

    Filesize

    3.7MB

  • memory/2560-73-0x00000000008F0000-0x00000000009F0000-memory.dmp

    Filesize

    1024KB