Some interesting stuff here...
http://intelreport.mandiant.com
This report is focused on the most prolific cyber espionage group Mandiant tracks: APT1. This single organization has conducted a cyber espionage campaign against a broad range of victims since at least 2006.
http://intelreport.mandiant.com/Mandiant_APT1_Report.pdf
Check out the digital appendix as well:
(more than 3,000 APT1 indicators including domain names, IP addresses, X.509 encryption certificates and MD5 hashes of malware in APT1's arsenal of digital weapons.)
http://intelreport.mandiant.com/Mandiant_APT1_Report_Appendix.zip