Other than propagating itself, the worm does no further damage to an infected computer.[25][26] The worm typically uses port 25 to spread, but uses port 119 if port 25 is not available.[3] The executable of the worm is 10,000 bytes in size; a list of spammed newsgroups and mail addresses is stored on the infected hard drive.[4][27] The worm spreads only if the Winsock library is not set to read-only.