Police in Kampong Chhnang town are on the lookout for a thief accused of stealing more than $2,000 on Friday.
Cops said a woman, 41, from Phnom Penh was visiting town when she went to a pharmacy and left her car unlocked.
She probably was overcome with another sick feeling when she found her bag full of cash was gone.
A nearby food vendor witnessed a man in a helmet grab the purse and flee on a moto.
Police are still searching for the perp, who apparently followed the woman after she withdrew money from a bank.