Is bitcoin the new honey badger?
In spite of being hit on all sides by bad news, the embattled virtual currency rallied sharply on Monday by nearly 20 percent, as questions swirled around the demise of the world's largest bitcoin exchange.
As regulators and prosecutors encircled Mt. Gox, the bitcoin trader that folded into bankruptcy protection last week as nearly $500 million of virtual currency vanished into the ether, bitcoin extended its rally.
The crypto-currency plunged immediately after the disclosure of Mt. Gox's troubles but began quietly rallying late last week as the world's attention shifted elsewhere. Some analysts think that the worst news may already be discounted in bitcoin's price, and that investors could be separating bitcoin and the defunct exchange.
"There's a lot of really good news coming out that's not getting attention," said Austin Alexander, deputy director of The Bitcoin Center in New York. He pointed to several positive developments, including a ruling by British authorities that bitcoin would receive the same tax treatment as other foreign currencies, as providing a boost to the virtual currency's spot price.
He speculated that investors may also be searching for safe-havens as Ukraine's confrontation with Russia reaches a boiling point, and engulfs world powers in a standoff.
"It just doesn't bode well for the world economic picture," Alexander said, adding that big venture capitalists like Marc Andreessen were still bullish on the currency.
According to a report in The Wall Street Journal, Mt. Gox is the target of an investigation by the U.S. attorney's office for the Southern District of New York. Prosecutors have subpoenaed the company, a person familiar with the matter told The Journal.
(Read more: Back to work at bitcoin's embattled Mt. Gox )
Although the currency has true believers, billionaire investor Warren Buffett isn't among them. In a "Squawk Box" interview Monday, the Oracle of Omaha told CNBC that bitcoin "isn't a currency" and that he wouldn't be surprised to see its complete demise in 10 to 20 years.
(Read more: Warren Buffett: Ukraine won't stop my stock-buying )
Bitcoin was trading under $700 on Monday afternoon, a gain of about 18 percent on the day, according to CoinDesk.
-By CNBC's Javier E. David