Demystifying DMARC: A guide to preventing email spoofing

A screenshot of a premade aggreate/summary DMARC dashboard in ELK using data from pardeemarc

DMARC can stop spoofed spam and phishing from reaching you and your customers, protecting your information security and your brand. However, complexity and misconceptions deter many organizations from ever deploying it. Part mythbusting , part implementation guide, this post explains the shortcomings of SPF and DKIM, what DMARC is, how to deploy DMARC properly, and how to respond to DMARC reports – all without the need for an additional vendor, thanks to open source software!

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How to compile and install FFmpeg 4.0 on Debian/Ubuntu

Here’s how to build and install FFmpeg 4.0 from source with all the bells and whistles (i.e codec support).  We’ll install it as a custom Debian package using checkinstall. That way, any other package that depends on the ffmpeg package will recognize that it is already installed, and won’t try to fetch it from the Debian or Ubuntu software repositories.

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

VirusTotal results showing the earliest observed sample of Wannacry ransomware

The WannaCry ransomware worm has spread panic and destruction as it infects hundreds of thousands of systems around the world; a rate not seen since the Blaster and Sasser worms of 2003. WannaCry — also known as WannaCrypt, WannaCryptor, WanaCrypt0r, WCry, or WCrypt — leverages vulnerabilities that Microsoft patched in the March MS17-010 Security Bulletin, after taking the unprecedented step of canceling the February Patch Tuesday.

While collecting samples of WannaCry, I found a sample that predates the worm version. The sample was compiled on February 9th, and uploaded to VirusTotal on February 10th. While compile timestamps can be faked, the closeness to the upload date suggests that the compilation timestamp is legitimate.

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

user manually enables "Ok Google" Trusted Voice

The headline feature of the new Google Pixel phones is deep integration between the operating system and the Google Assistant AI. By default, the Google Assistant can be activated even when the phone is locked and the display is off, if the device hears the trusted voice say the hot word, “Ok Google”. This also has the effect of unlocking the device, meaning that anyone with a recording of the trusted voice saying “Ok Google” — or even someone with a similar voice — can easily unlock the device.

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Android 7.1 adds native android visual voicemail support for Verizon

After upgrading my Nexus 6P on Verizon to the Android 7.1.1 beta, I discovered that Visual Voicemail in the native Android dialer works! You just need to make sure that that basic (free) or premium visual voicemail is active on your line. Voicemail-to-text works too, if you add Premium Visual Voicemail to your line. Unfortunately, there is no sign of Wi-Fi calling support (yet?). HD voice has always worked on the Nexus 6P.

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

A screenshot of the EAF+ error generateted W=by the latest Google Chrome release when used with the defualt EMET config

When Google Chrome updated to 53.0.2785.101 on my Windows systems, I encountered an onslaught of alerts from EMET, which was killing chrome.exe processes for EAF+ violations as fast as Chrome kept trying to spawn them (each tab in Chrome is a separate process). Luckily, this problem is easily fixable.

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