General

  • Target

    TIRNAK.exe

  • Size

    29KB

  • Sample

    201215-9k9yn8545x

  • MD5

    2cb0cf48d5eafbd16bbf8cdda749d628

  • SHA1

    1b71449f295eae0994f4d62de838b1af168c0a09

  • SHA256

    e9575adae2fa6afb6b8d8fb098feec9d4acbadabda4beeca90433b578cd6afa1

  • SHA512

    1f6e0be8e3c66aa8a1ac7e41b26b0b29bf055039c3bd8116cb33aa5874077c1325fcbfc0a934e2fdd6da89acea34b1cf2875147f0470346afeca7e9193d79927

Malware Config

Extracted

Credentials

  • Protocol:
    smtp
  • Host:
    mail.porathacorp.com
  • Port:
    587
  • Username:
    devarajan@porathacorp.com
  • Password:
    susila@22

Targets

    • Target

      TIRNAK.exe

    • Size

      29KB

    • MD5

      2cb0cf48d5eafbd16bbf8cdda749d628

    • SHA1

      1b71449f295eae0994f4d62de838b1af168c0a09

    • SHA256

      e9575adae2fa6afb6b8d8fb098feec9d4acbadabda4beeca90433b578cd6afa1

    • SHA512

      1f6e0be8e3c66aa8a1ac7e41b26b0b29bf055039c3bd8116cb33aa5874077c1325fcbfc0a934e2fdd6da89acea34b1cf2875147f0470346afeca7e9193d79927

    • MassLogger

      Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.

    • MassLogger Main Payload

    • Modifies WinLogon for persistence

    • Checks computer location settings

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

    • Deletes itself

    • Drops startup file

    • 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 Matrix ATT&CK v6

Persistence

Winlogon Helper DLL

1
T1004

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

1
T1012

System Information Discovery

1
T1082

Collection

Data from Local System

1
T1005

Tasks