Tangkap Malaysian Official 1 (TangkapMO1) rally organiser Anis Syafiqah Md Yusof has been issued with a show-cause letter for allegedly smearing Universiti Malaya's name.

"Finally, a love letter from UM. I love UM," the undergraduate wrote on Facebook.

UM vice-chancellor of student affairs Rohana Yusof said Anis Syafiqah "damaged or undermined university interests, good name and harmony" by organising the rally against Prime Minister Najib Abdul Razak in Kuala Lumpur on Aug 27.

The undergraduate must reply to the show cause letter, dated Oct 12, seven days after receipt.

Failure to reply could lead disciplinary action, Rohana said in the letter.

Anis Syafiqah and her team of student organisers led about 1,500 people to march to Dataran Merdeka, where an effigy of Najib was forced behind bars.

The students said they will follow up the rally with a nationwide roadshow.

The rally was to call for the arrest of Najib following the United States Department of Justice in a court filing said 'Malaysian Official 1' received US$731 million which originated from 1MDB.

It did not identify 'Malaysian Official 1' by name but described the individual as a high ranking Malaysian official who is related to Najib's stepson Riza Aziz.

Najib was not named as he is not subject of the civil forfeiture action, aimed at seizing more than US$1 billion of assets bought in US using funds allegedly siphoned from 1MDB.

This includes future proceeds of the blockbuster film The Wolf of Wall Street.

Red Granite Pictures, a Hollywood production firm founded by Riza which produced the film, and other claimants have until Oct 28 to respond to the DOJ's lawsuit.