The agency has a Baa3/P-3 rating on the Delhi-based lender now while it has a Baa3 rating on its foreign currency issuer rating. The bank overall has a Baa2 rating with a stable outlook now from Moody's.
The review for downgrade will focus on: (1) the timing and quantum of the financial impact of the fraudulent transactions, (2) any management actions taken to improve the capitalization profile of the bank, and (3) any punitive actions taken by the regulator on the bank, Moody's Investor Service said.
"The primary driver for today's rating action is the risk of weakening standalone credit profile of PNB, as a result of a number of fraudulent transactions" through fake letters of undertakings issued by the bank to other lenders worth USD 1.8 billion over the past many years, Moody's said.
The scam came out into the open on 14 February 2018, when it informed the stock exchanges.
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The fraudulent transactions represent about 230 basis points of the bank's risk-weighted assets as of December 2017.
As such, its capital position would deteriorate markedly, and fall below minimum regulatory needs, if the bank is required to provide for the entire exposure, it said.
Consequently, PNB may need to raise capital externally, mainly from the government, to comply with the minimum Basel III capital requirement of 8 per cent common equity tier 1 (CET1) ratio by March 2019.
The discovery of the fraudulent transactions also highlights the weak operational controls and corporate governance at the bank.
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