So you want to add a little spice to your indicators of compromise. After all, an IoC without context or attribution is very much like when you learn what hot is. There are many tools available for us to determine how “hot” an IoC is without burning ourselves. We will be focusing mainly on what we can access publicly and use for free.
In this quick, end of the week post, we wanted to touch on the ubiquitous COVID-19 (aka Corona Virus). Sharing an interesting lure, related malware, and some IOCs for colleagues to dig into while society on a whole is relegated to solitude in our homes. Our posting here is in no way comprehensive. There is a myriad of malware campaigns, disinformation operations, and general scamming revolving around the very concerning topic. Our goal is to further awareness and share some knowledge in the process.
No one wants to get coal in their stocking, but it does happen. Unfortunately, your stocking is a computer, and bad guys are delivering the coal in the form of Ransomware.
SOC analysts typically have access to a mix of proprietary, commercial, open source, and personal reputation sources for various indicator of compromise (IOCs). IOCs include file hashes, IP addresses, domain names, SSL certificate fingerprints and more. Aggregating the variety of feeds into a single source is a prudent first-step for manual search and programmatic accessibility. In this article we outline a number of publicly available resources and describe a simple method for aggregating them into a single reputation database.