Wednesday, September 6, 2023

Quick Malware Analysis: GOZI/ISFB INFECTION WITH COBALT STRIKE pcap from 2023-07-12

Thanks to Brad Duncan for sharing this pcap:
https://www.malware-traffic-analysis.net/2023/07/12/index.html

We did a quick analysis of this pcap on the NEW Security Onion 2.4. If you'd like to follow along, you can do the following:

The screenshots at the bottom of this post show some of the interesting alerts, metadata logs, and session transcripts. 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.

Our 10th Annual Security Onion Conference is coming up soon, so reserve your seat today! Last day to register is September 29. For more details, please see https://socaugusta2023.eventbrite.com/.

Do you want to deploy the new Security Onion 2.4 to your enterprise but need training? Our first 4-day public training class on Security Onion 2.4 will be in beautiful Augusta GA as part of Augusta Cyber Week! The class is at a very special price AND you get a free ticket to BOTH Security Onion Conference AND BSidesAugusta! For more information, please see https://blog.securityonion.net/2023/07/registration-now-open-for-augusta-cyber.html.

Do you want to deploy Security Onion to your enterprise and want the best enterprise hardware? We know Security Onion's hardware needs, and our appliances are the perfect match for the platform. Leave the hardware research, testing, and support to us, so you can focus on what's important for your organization. Not only will you have confidence that your Security Onion deployment is running on the best-suited hardware, you will also be supporting future development and maintenance of the Security Onion project! For more information, please see https://securityonionsolutions.com/hardware.

Screenshots

First, we start with the overview of all alerts and logs:


Next, let's review the alerts:


Drilling into "ET MALWARE Ursnif Payload Request (cook64.rar)" alert, we see:


Pivoting to pcap, we see the full TCP stream:


Switching to the ASCII transcript shows the HTTP transaction more clearly:


Next, we drill into the "ET MALWARE Ursnif Payload Request (cook32.rar)" alert:


Pivoting to pcap, we see the ASCII transcript of the HTTP transaction:


Next, we drill into the "ET INFO Dotted Quad Host ZIP Request" alert:


Pivoting to pcap, we see the ASCII transcript of the HTTP transaction:


Next, we drill into the "ET MALWARE Ursnif Variant CnC Beacon 3" alerts:


Pivoting to pcap, we see the ASCII transcript of the HTTP transaction:


Next, let's review the protocol metadata:


Drilling into HTTP logs we see several POST requests going to foreign sites and we see the RAR and ZIP downloads noted earlier:


Drilling into SSL logs, we see lots of traffic going to a site with an interesting name:


Drilling into DNS logs, we see the DNS lookups for the interesting domain names noted earlier:


Finally, the connection logs include GeoIP lookups showing foreign countries noted earlier:



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