Quick Malware Analysis: Lumma Stealer pcap from 2025-06-26

Thanks to Brad Duncan for sharing this pcap from 2025-06-26 on his malware traffic analysis site! Due to issues with Google flagging a warning for the site, we're not including the actual hyperlink but it should be easy to find.

We did a quick analysis of this pcap using Security Onion 2.4.160:

https://blog.securityonion.net/2025/06/security-onion-24160-now-available.html

If you'd like to follow along, you can do the following:

• install Security Onion 2.4.160 in a VM:
  https://docs.securityonion.net/en/2.4/first-time-users.html
• import the pcap using the SOC Grid interface:
  https://docs.securityonion.net/en/2.4/grid.html#icons-in-lower-left-corner
• optionally enable the DNS lookups feature:
  https://docs.securityonion.net/en/2.4/soc-customization.html?#reverse-dns-lookups

The screenshots at the bottom of this post show some of the interesting alerts, their associated AI Summaries, and the new Guided Analysis feature. Keep in mind that this is not some contrived demo, we simply downloaded the latest Lumma malware PCAP from Brad Duncan's site and imported it into Security Onion. Also keep in mind that this was just a PCAP and so there was no endpoint data. Had there been endpoint data, the Guided Analysis results would have been even more in-depth.

Want more practice? Check out our other Quick Malware Analysis posts at:

https://blog.securityonion.net/search/label/quick%20malware%20analysis

About Security Onion

Security Onion is a versatile and scalable platform that can run on small virtual machines and can also scale up to the opposite end of the hardware spectrum to take advantage of extremely powerful server-class machines.  Security Onion can also scale horizontally, growing from a standalone single-machine deployment to a full distributed deployment with tens or hundreds of machines as dictated by your enterprise visibility needs. To learn more about Security Onion, please see:
https://securityonion.net

Screenshots

Let's start with an overview of all alerts:

Now let's drill into the first alert, review the AI Summary on the right, and then review the Guided Analysis questions below:

Now let's drill into some of those Guided Analysis questions to see the queries and automated results:

Next let's look at the second alert, its AI Summary, and its Guided Analysis:

Next, we'll review the third alert, its AI Summary, and its Guided Analysis:

Now let's move on to the fourth alert, its AI Summary, and its Guided Analysis questions:

Moving on to the next alert:

Moving on to the next alert:

Moving on to the next alert:

And now the final alert: