General

  • Target

    ab182aba5412399f9e5f505bb3d8d145458fb108473fafbdbed740eae40738f8.exe

  • Size

    628KB

  • Sample

    240524-b1lxfagg35

  • MD5

    b7649e5cb8035e0d62e3275244bc0c21

  • SHA1

    d39f5c06a58a53002cce5db542a70a7ceba843b7

  • SHA256

    ab182aba5412399f9e5f505bb3d8d145458fb108473fafbdbed740eae40738f8

  • SHA512

    610432d57c326de6fbb3f9d0bbdb8023e556f2cda2f7b011d7ca5d9e5c2f308c8d9665aa9cd075f071c0f8916b8dbd10172ab2b02be477dea4fb27f09c7decc3

  • SSDEEP

    12288:U++oXh1udZSqk9nk3kJQZsOcnSpDahm/GRkLB1wR2wveenfRCFFUems8iDguPB:7Xh1eZNktakJQZyAec4g62qfRCFFpkKh

Malware Config

Extracted

Credentials

  • Protocol:
    smtp
  • Host:
    mail.brusln.com
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    Countrycode@2024

Extracted

Family

agenttesla

Credentials

Targets

    • Target

      ab182aba5412399f9e5f505bb3d8d145458fb108473fafbdbed740eae40738f8.exe

    • Size

      628KB

    • MD5

      b7649e5cb8035e0d62e3275244bc0c21

    • SHA1

      d39f5c06a58a53002cce5db542a70a7ceba843b7

    • SHA256

      ab182aba5412399f9e5f505bb3d8d145458fb108473fafbdbed740eae40738f8

    • SHA512

      610432d57c326de6fbb3f9d0bbdb8023e556f2cda2f7b011d7ca5d9e5c2f308c8d9665aa9cd075f071c0f8916b8dbd10172ab2b02be477dea4fb27f09c7decc3

    • SSDEEP

      12288:U++oXh1udZSqk9nk3kJQZsOcnSpDahm/GRkLB1wR2wveenfRCFFUems8iDguPB:7Xh1eZNktakJQZyAec4g62qfRCFFpkKh

    • AgentTesla

      Agent Tesla is a remote access tool (RAT) written in visual basic.

    • UAC bypass

    • Windows security bypass

    • Detect packed .NET executables. Mostly AgentTeslaV4.

    • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

    • Detects executables packed with or use KoiVM

    • Detects executables referencing Windows vault credential objects. Observed in infostealers

    • Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers

    • Detects executables referencing many email and collaboration clients. Observed in information stealers

    • Detects executables referencing many file transfer clients. Observed in information stealers

    • Looks for VirtualBox Guest Additions in registry

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Looks for VMWare Tools registry key

    • Checks BIOS information in registry

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

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Reads WinSCP keys stored on the system

      Tries to access WinSCP stored sessions.

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads user/profile data of local email clients

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

    • Reads user/profile data of web browsers

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

    • Windows security modification

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Maps connected drives based on registry

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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks