He first tested positive for marijuana, which results in a fine of $2,500 but not a suspension/policy violation. After he tested positive for marijuana, WWE ordered another drug test for other substances. That's when the Dianabol was apparently discovered.
Dianabol (methandrostenolone) is a steroid that can be taken orally or injected. It was popular in the bodybuilding community until it was banned by the US Congress under Controlled Substances Act of 1970.
Orton is keeping very quiet about the whole situation and is not even talking with co-workers about why he was suspended.
There is no confirmation to this rumor yet so take it for what it’s worth.