Morgan Stanley said on Monday that the New York Attorney General's office indicated it would file a lawsuit accusing the Wall Street bank of misrepresenting or omitting material information in about 30 subprime securitizations.

The accusations pertain to Morgan Stanley's due diligence, underwriting and valuation of loans in the securitizations, as well as the properties securing them, Morgan Stanley said. The attorney general indicated the potential lawsuit would be brought under the Martin Act, the bank added.

In its annual 10-K regulatory filing, Morgan Stanley said it disagreed with the allegations and presented defenses to the attorney general.

The attorney general's office did not have an immediate comment on the disclosure.

The bank said it had added $2.8 billion to its legal reserves to cover outstanding matters since its earnings report in January. That amount includes an agreement it reached last month to pay $2.6 billion to settle mortgage-bond claims with the U.S. Department of Justice and the U.S. Attorney's Office for the Northern District of California.

Due to that settlement, Morgan Stanley revised the 2014 earnings it reported on Jan. 20 downward to $3.15 billion, or $1.60 per share, from $5.82 billion, or $2.95 per share.

Overall, Morgan Stanley said its legal expenses last year rose to $3.41 billion from $1.95 billion in 2013.

Shares of Morgan Stanley were up 0.6 percent at $36 in morning trading.