Analysis

  • max time kernel
    146s
  • max time network
    152s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240508-en
  • resource tags

    arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    24-05-2024 14:15

General

  • Target

    31780dfdd0ede6aacbc2370d0be7548ab0264a51b9f569712f27ffc3fcd90a78.exe

  • Size

    2.4MB

  • MD5

    27af017546fa68fc90e9f93260bcf562

  • SHA1

    e0fa4ddf9f97f3c8ad0bdb41030afc32d697f888

  • SHA256

    31780dfdd0ede6aacbc2370d0be7548ab0264a51b9f569712f27ffc3fcd90a78

  • SHA512

    01254b79613f4273c674bf62fc5d36e1c462314ccb846e2e0a56c74679189838996c5ab5534b80424391ab6cda5472c2594b2b0ae206df2015d633c563ed64b2

  • SSDEEP

    49152:jxIRJF1HL+VdX68kUGJtTF+TxMoxc1TU+j+dAzGwlrh:jEJF16dX68dGtIuoITsdZ

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://steamcommunity.com/profiles/76561199689717899

https://t.me/copterwin

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 8 IoCs
  • Stealc

    Stealc is an infostealer written in C++.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • 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
  • Checks processor information in registry 2 TTPs 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\31780dfdd0ede6aacbc2370d0be7548ab0264a51b9f569712f27ffc3fcd90a78.exe
    "C:\Users\Admin\AppData\Local\Temp\31780dfdd0ede6aacbc2370d0be7548ab0264a51b9f569712f27ffc3fcd90a78.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2968
    • C:\Users\Admin\AppData\Local\Temp\kat77DF.tmp
      C:\Users\Admin\AppData\Local\Temp\kat77DF.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:816

Network

MITRE ATT&CK Matrix ATT&CK v13

Credential Access

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

Query Registry

2
T1012

System Information Discovery

1
T1082

Collection

Data from Local System

1
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\kat77DF.tmp
    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/816-8-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/816-10-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/816-4-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/816-14-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/816-15-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/816-17-0x0000000019380000-0x00000000195DF000-memory.dmp
    Filesize

    2.4MB

  • memory/816-32-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/816-33-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/2968-0-0x00000000023D0000-0x00000000023D1000-memory.dmp
    Filesize

    4KB

  • memory/2968-2-0x0000000004130000-0x0000000004279000-memory.dmp
    Filesize

    1.3MB

  • memory/2968-9-0x0000000000400000-0x0000000000678000-memory.dmp
    Filesize

    2.5MB