General

  • Target

    85181e5805f7d9111755cb3afff215a156b86330bed4241c0383d7091e1dc8fc.xlsx

  • Size

    307KB

  • Sample

    240604-b1at6she24

  • MD5

    031d807751d6de5a2afe93ac2eb1082e

  • SHA1

    c1b39e8360eae83cac8ff89419ea12c3451a49af

  • SHA256

    85181e5805f7d9111755cb3afff215a156b86330bed4241c0383d7091e1dc8fc

  • SHA512

    289bcfe423e353ae8463346662b694a1541852c1dbb770b0a8b5220869536e0a9724df1d13c2c138b1fd9ef79d838e0dc78824e7e315668951db0adb167a40df

  • SSDEEP

    6144:1KhLPWXyM4iMZgWoji6H2JDsndTUgl1cz9m3NrkMas4WYhcXjJfwHj:eK1GgW6ZWJon9UJ43NlaspmkIHj

Malware Config

Extracted

Family

agenttesla

Credentials

Targets

    • Target

      85181e5805f7d9111755cb3afff215a156b86330bed4241c0383d7091e1dc8fc.xlsx

    • Size

      307KB

    • MD5

      031d807751d6de5a2afe93ac2eb1082e

    • SHA1

      c1b39e8360eae83cac8ff89419ea12c3451a49af

    • SHA256

      85181e5805f7d9111755cb3afff215a156b86330bed4241c0383d7091e1dc8fc

    • SHA512

      289bcfe423e353ae8463346662b694a1541852c1dbb770b0a8b5220869536e0a9724df1d13c2c138b1fd9ef79d838e0dc78824e7e315668951db0adb167a40df

    • SSDEEP

      6144:1KhLPWXyM4iMZgWoji6H2JDsndTUgl1cz9m3NrkMas4WYhcXjJfwHj:eK1GgW6ZWJon9UJ43NlaspmkIHj

    • AgentTesla

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

    • Detect packed .NET executables. Mostly AgentTeslaV4.

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

    • 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

    • Blocklisted process makes network request

    • Downloads MZ/PE file

    • Abuses OpenXML format to download file from external location

    • Executes dropped EXE

    • Loads dropped DLL

    • 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.

    • Adds Run key to start application

    • Looks up external IP address via web service

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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks