Corelight Labs Team

Detecting Log4j exploits via Zeek when Java downloads Java

Detecting Log4j exploits via Zeek when Java downloads Java

We have published an initial blog on the Log4j exploit and a followup blog with a second detection method for detecting the first stage of exploits occurring over LDAP.  Today, we will discuss a third detection method, this one focused on the... Read more »

Detecting Log4j via Zeek & LDAP traffic

We recently discussed some methods for detecting the Log4j exploit, and we’ve now developed another method that everyone running Zeek® or a Corelight sensor can use. Our new approach is based on the rarity of legitimate downloads of Java via LDAP.... Read more »

Simplifying detection of Log4Shell

Simplifying detection of Log4Shell

Security workers across the world have been busy since last Friday dealing with CVE-2021-44228, the log4j 0-day known as Log4Shell, that is already being heavily exploited across the Internet. Given the huge number of systems that embed the... Read more »

Detecting CVE-2021-42292

On its surface, CVE-2021-42292 doesn’t look like the kind of vulnerability that a network-based tool can find reliably. Marked by Microsoft as a local file format vulnerability, security veterans would expect that between encryption and encoding,... Read more »

PrintNightmare, SMB3 encryption, and your network

CVE-2021-1675, also tracked in CVE-2021-34527, is a remote code execution vulnerability that targets the Windows Print Spooler service. In a nutshell, there is a Distributed Computing Environment / Remote Procedure Call (DCE/RPC) that allows... Read more »

Corelight Sensors detect the ChaChi RAT

Recently Blackberry analyzed a new GoLang Remote Access Trojan (RAT) named “ChaChi.” This sample was interesting in that it tunnels information over DNS as its preferred command and control (C2) mechanism. We downloaded two PCAPs from the malware... Read more »

Pingback: ICMP Tunneling Malware

Recently, Trustwave reported on a new malware family which they discovered during a breach investigation. The backdoor, dubbed Pingback, executes on Windows systems and communicates with its controller via ICMP messages. ICMP (Internet Control... Read more »


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