Here is a link to an FBI article, covering a statement to a congressional commitee about threats to the financial sector. It includes a discussion of TDoS attacks. Here is the link and the part that describes the TDoS attacks:
http://www.fbi.gov/news/testimony/cyber-security-threats-to-the-financial-sector
In 2010, law enforcement agencies and financial regulators observed a trend in which cyber criminals initiated unauthorized financial transactions from compromised victim bank or brokerage accounts. These transactions were paired with a Telephone Denial of Service (TDoS) attack, in which the victim’s legitimate phone line was flooded with spam-like telephone calls to prevent the banks or brokerage firms from contacting the victim to verify that the transactions were legitimate.
In December 2009, a victim in Florida filed a police report stating that $399,000 had disappeared from his online brokerage account while he was simultaneously targeted in a TDoS attack. The online withdrawals occurred in four increments, with progressively larger amounts being withdrawn each time.
Cyber criminals target not only those who trade in securities but also the exchanges in which the securities are sold. These TDoS and Distributed Denial of Service (DDoS) attacks show a desire by cyber criminals to focus their efforts on high-profile financial sector targets.
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