General

  • Target

    597c83ab1abf87d61ae707b071bfa729762491c397095316571cc3bd6f4f89aa

  • Size

    1.3MB

  • Sample

    250110-bkmtssypak

  • MD5

    459aa41d82c5b3ab2d9462fafa27d280

  • SHA1

    db27b0e83265568ef3e39b997f107bb33270a4ff

  • SHA256

    597c83ab1abf87d61ae707b071bfa729762491c397095316571cc3bd6f4f89aa

  • SHA512

    8a2c55e82f604a687be743f55791c4f3d2445335131d45d49540ab5d321237c7a04603baff8c875f5e26d7205e9c464c57db96de90201214b99bc6b77dd38afc

  • SSDEEP

    24576:zAmM5CDT3IxrrGwsclv1RIAhjLoamMiX4lNmZg0YxegPbUIDPP:zAmTD7IxrAcDjLoyEkmZ9Y14

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    smtp.yandex.com
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    officepost8

Extracted

Credentials

  • Protocol:
    smtp
  • Host:
    smtp.yandex.com
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    officepost8

Targets

    • Target

      597c83ab1abf87d61ae707b071bfa729762491c397095316571cc3bd6f4f89aa

    • Size

      1.3MB

    • MD5

      459aa41d82c5b3ab2d9462fafa27d280

    • SHA1

      db27b0e83265568ef3e39b997f107bb33270a4ff

    • SHA256

      597c83ab1abf87d61ae707b071bfa729762491c397095316571cc3bd6f4f89aa

    • SHA512

      8a2c55e82f604a687be743f55791c4f3d2445335131d45d49540ab5d321237c7a04603baff8c875f5e26d7205e9c464c57db96de90201214b99bc6b77dd38afc

    • SSDEEP

      24576:zAmM5CDT3IxrrGwsclv1RIAhjLoamMiX4lNmZg0YxegPbUIDPP:zAmTD7IxrAcDjLoyEkmZ9Y14

    • AgentTesla

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

    • Agenttesla family

    • AgentTesla payload

    • Detected Nirsoft tools

      Free utilities often used by attackers which can steal passwords, product keys, etc.

    • Command and Scripting Interpreter: PowerShell

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

    • Stops running service(s)

    • Checks computer location settings

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

    • 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.

    • Unsecured Credentials: Credentials In Files

      Steal credentials from unsecured files.

    • Accesses Microsoft Outlook profiles

    • Adds Run key to start application

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks