By Shikhar Dalela and Jeewan Singh Jalal
The operators named the kit themselves.
Buried inside compromised legitimate websites, the hidden staging directory is sometimes literally called β/.bulletproofβ, and the PHP session cookie the kit sets on every visitor is named βbp_redir_sess.β The βbpβ stands for bulletproof, which is an unusual degree of candor from a threat actor whose entire design philosophy is concealment.