An "attack" most often over a messaging service, although the attack could occur in person. The nature of the attack ranges from complaining about one's health (such as eyesight, exhaustion etc) to complaining about frivolous things such as the going-on's at a local office (that don't affect the work). The attacks are, in essence, disguised forms of complaining. The entire conversation is initiated to implement the attack, although most often beginning with a neutral statement to fool the victim into thinking it is a mutual conversation.
"OMG Bill totally Stan Attacked me last night! And I had so much work to get done..."