Information Security Archives – seanthegeek.net

Information Security

Posts related to information security, including news, tutorials, malware analysis, and threat intelligence.

Proofpoint is forcing their customers to pay for Email Fraud Defense to get aggregate DMARC data from their own gateways

I have written extensively about the DMARC email security standard, including publishing a comprehensive guide on how to implement it,…

June 4, 2019

Emotet malspam campaign exploits reliance on magic for file type detection

Emotet is a Trojan designed to steal banking information. It is frequently spread by sending phishing emails to governments, banks,…

January 26, 2019

How to inspect the certificate of a mail server over a CLI

If you ever need to inspect the certificate of a remote SMTP server, you can use the openssl CLI tool.…

November 29, 2018

Demystifying DMARC: A guide to preventing email spoofing

DMARC can stop spoofed spam and phishing from reaching you and your customers, protecting your information security and your brand.…

June 15, 2018

Lessons Learned from the US Federal Government’s Ongoing Deployment of SPF and DMARC

SPF and DMARC are standards that describe how the origins of email messages should be verified, to prevent email spoofing.…

January 1, 2018

How to install YARA and write basic YARA rules to identify malware

YARA is described as "The pattern matching Swiss knife for malware researchers (and everyone else)". Think of it as like…

June 15, 2017

WannaCry ransomware analysis: Samples date back to at least early February 2017

The WannaCry ransomware worm has spread panic and destruction as it infects hundreds of thousands of systems around the world;…

May 18, 2017

Google Pixel phones can be unlocked with a recording of a trusted voice by default

The headline feature of the new Google Pixel phones is deep integration between the operating system and the Google Assistant…

October 23, 2016

PSA: The latest Google Chrome release trips EMET’s EAF+ mitigation

When Google Chrome updated to 53.0.2785.101 on my Windows systems, I encountered an onslaught of alerts from EMET, which was…

September 9, 2016

HHS: Ransomware encryption of ePHI is a HIPAA breach

As a growing number of medical facilities are struck by ransomware, the US Department of Health and Human Services (HHS)…

August 23, 2016