This week I wanted to highlight some useful content from the broader community: C2IntelFeeds by drb-ra. drb-ra shares likely C2 servers on their twitter feed and many useful queries for finding likely C2 are provided in their Git repo. For example:

• BianLian Go Trojan: same_service(services.tls.certificates.leaf_data.subject_dn=/C=[0-9a-zA-Z]{16}, O=[0-9a-zA-Z]{16}, OU=[0-9a-zA-Z]{16}/ AND services.tls.certificates.leaf_data.issuer_dn=/C=[0-9a-zA-Z]{16}, O=[0-9a-zA-Z]{16}, OU=[0-9a-zA-Z]{16}/)
• Qakbot: same_service(services.jarm.fingerprint={"21d14d00021d21d21c42d43d0000007abc6200da92c2a1b69c0a56366cbe21","04d02d00004d04d04c04d02d04d04d9674c6b4e623ae36cc2d998e99e2262e"} AND services.http.response.body_hash="sha1:22e5446e82b3e46da34b5ebce6de5751664fb867") OR same_service(services.banner_hashes="sha256:5234096d7003929ad67037af6f5816933cab9e85f9b286468249ac9ab9bfb861" AND services.http.response.body_hash="sha1:22e5446e82b3e46da34b5ebce6de5751664fb867") OR (services.tls.certificates.leaf_data.subject_dn: /C=[A-Z]{2}, OU=([A-Z][a-z]{3,})( [A-Z][a-z]{3,}){0,2}, CN=[a-z]{4,12}\.[a-z]{2,4}/ and not services.tls.certificates.leaf_data.subject_dn:"OU=Domain Control Validated")

Check them out on GitHub and twitter for more.

This is part of a regular series of posts in which we highlight useful, interesting, and otherwise cool queries for use with Censys Search and ASM. If you have any questions, similar queries, or custom versions of this week’s highlight, let us know!