Evading forensics and anti-virus
A series of standards lay out CIA malware infestation patterns which are likely to assist forensic crime scene investigators as well as Apple, Microsoft, Google, Samsung, Nokia, Blackberry, Siemens and anti-virus companies attribute and defend against attacks.
"Tradecraft DO's and DON'Ts" contains CIA rules on how its malware should be written to avoid fingerprints implicating the "CIA, US government, or its witting partner companies" in "forensic review". Similar secret standards cover the use of encryption to hide CIA hacker and malware communication (pdf), describing targets & exfiltrated data (pdf) as well as executing payloads (pdf) and persisting (pdf) in the target's machines over time.
CIA hackers developed successful attacks against most well known anti-virus programs. These are documented in AV defeats, Personal Security Products, Detecting and defeating PSPs and PSP/Debugger/RE Avoidance. For example, Comodo was defeated by CIA malware placing itself in the Window's "Recycle Bin". While Comodo 6.x has a "Gaping Hole of DOOM".
CIA hackers discussed what the NSA's "Equation Group" hackers did wrong and how the CIA's malware makers could avoid similar exposure.
https://wikileaks.org/ciav7p1/