If we are being honest, nobody here can really answer that. The requests can act benign until the attacker chooses to change the payload based on source IP, ti

If we are being honest, nobody here can really answer that. The requests can act benign until the attacker chooses to change the payload based on source IP, time of day, source network, user-agent, etc... I believe it is best to block any outbound network connection you did not define in your code. e.g. your code uses a filtering proxy for approved API destinations.