Analysis

  • max time kernel
    92s
  • max time network
    123s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240508-en
  • resource tags

    arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    27-05-2024 14:16

General

  • Target

    756977d719d27e93520a5de1616e76c08dab5b1c1fd3b9fd0d6cdab479bd78e0.exe

  • Size

    1.9MB

  • MD5

    81ad6e94c93db5d152ce8d8b024d5dfb

  • SHA1

    b0351a0960d5989e283562c81447a0705c420bb0

  • SHA256

    756977d719d27e93520a5de1616e76c08dab5b1c1fd3b9fd0d6cdab479bd78e0

  • SHA512

    fb69a12261acc9d5beaf65fb2614aeb5649576f129db129d739faf7502a7dfb88c86efeb4b1a7b81dde6c17caef8f54148a8fa0af7ead15f6bf1f5a2cdf59592

  • SSDEEP

    49152:CdKfTn6veJtTF+TxMoxc1TU+j+dAzGwlrh:CdKfTnttIuoITsdZ

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\756977d719d27e93520a5de1616e76c08dab5b1c1fd3b9fd0d6cdab479bd78e0.exe
    "C:\Users\Admin\AppData\Local\Temp\756977d719d27e93520a5de1616e76c08dab5b1c1fd3b9fd0d6cdab479bd78e0.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2260
    • C:\Users\Admin\AppData\Local\Temp\kat6AD0.tmp
      C:\Users\Admin\AppData\Local\Temp\kat6AD0.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:1160

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\kat6AD0.tmp
    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/1160-4-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/1160-8-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/1160-10-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/1160-19-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/1160-20-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/1160-22-0x00000000260A0000-0x00000000262FF000-memory.dmp
    Filesize

    2.4MB

  • memory/1160-37-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/1160-38-0x0000000000400000-0x0000000000646000-memory.dmp
    Filesize

    2.3MB

  • memory/2260-0-0x0000000002420000-0x0000000002421000-memory.dmp
    Filesize

    4KB

  • memory/2260-1-0x0000000004040000-0x0000000004189000-memory.dmp
    Filesize

    1.3MB

  • memory/2260-9-0x0000000000400000-0x00000000005EC000-memory.dmp
    Filesize

    1.9MB