Quick Malware Analysis: Revil ransomware

This is our last Quick Malware Analysis of 2021, so we're making it a fun one! 

We prepared a Windows VM with Sysmon and then downloaded Revil ransomware:
https://app.any.run/tasks/c6cd2f29-9068-4db3-85c2-176f2bbb4b80/

We captured the network traffic and system logs and then imported into Security Onion via so-import-pcap and so-import-evtx:
https://docs.securityonion.net/en/2.3/so-import-pcap.html
https://docs.securityonion.net/en/2.3/so-import-evtx.html

Below are some of the interesting Suricata alerts, Zeek logs, and session transcripts.

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
https://securityonion.net/docs

More Samples

Find all of our Quick Malware posts at:
https://blog.securityonion.net/search/label/quick%20malware%20analysis

Screenshots

Quick Malware Analysis: Astaroth/Guildma Infection from Brazil malspam pcap from 2021-12-23

Thanks to Brad Duncan for sharing this pcap!
https://www.malware-traffic-analysis.net/2021/12/23/index.html

We did a quick analysis of this pcap on the latest version of Security Onion via so-import-pcap:
https://docs.securityonion.net/en/2.3/so-import-pcap.html

Below are some of the interesting Suricata alerts, Zeek logs, and session transcripts.

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
https://securityonion.net/docs

More Samples

Find all of our Quick Malware posts at:
https://blog.securityonion.net/search/label/quick%20malware%20analysis

Screenshots

Detecting Log4j Exploitation Attempts via Zeek in Security Onion

Corelight has developed a Zeek package to detect log4j exploitation attempts:

https://github.com/corelight/cve-2021-44228

This package contains Zeek scripts which can easily be loaded into your Security Onion deployment. We've documented this process here:

https://docs.securityonion.net/en/2.3/zeek.html#custom-script-example-log4j

After following this process, we ran so-import-pcap on the log4j pcap from https://www.malware-traffic-analysis.net/2021/12/14/index.html:

Quick Malware Analysis: December 2021 Forensic Challenge pcap from 2021-12-03

Thanks to Brad Duncan for sharing this pcap!
https://isc.sans.edu/forums/diary/December+2021+Forensic+Contest+Answers+and+Analysis/28160/

We did a quick analysis of this pcap on the latest version of Security Onion via so-import-pcap:
https://docs.securityonion.net/en/2.3/so-import-pcap.html

Below are some of the interesting Suricata alerts, Zeek logs, and session transcripts.

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
https://securityonion.net/docs

More Samples

Find all of our Quick Malware posts at:
https://blog.securityonion.net/search/label/quick%20malware%20analysis

Screenshots