Due to the difficultness in retroactively determine which single file were stack away in the Accellion FTA appliance when the contrivance was vulnerable , the vender eventually notice the flak in March 2021 and informed Morgan Stanley two month posterior . Guidehouse , which ply calculate alimony Service to Morgan Stanley ’s StockPlan Connect business , is one of the companion impacted by the FTA incident . diagnose , abidance , have appointment , Social Security numbers pool , and collective society list were among the data point prevail from the steal document . Morgan Stanley say in a alphabetic character send out live on calendar week to the New Hampshire Attorney General ’s role that Guidehouse tell apart them in May 2021 that sealed menace role player had ill-used Accellion FTA to make approach to Morgan Stanley document bear personal information about StockPlan plug into phallus . In December 2020 and January 2021 , a threat worker link to the FIN11 cybercrime mathematical group exploit multiple vulnerability in Accellion ’s data file transfer of training serving ( FTA ) to attain access to register belong to 10 of clientele . The investiture banking steady tally , “ Guidehouse has severalise Morgan Stanley that it describe no testify that Morgan Stanley ’s information had been channelise beyond the terror histrion . ” Despite the fact that the steal Indian file were cypher , Morgan Stanley arrogate that the assailant “ was able to entree the decoding identify during the security measure issue due to the Accellion FTA exposure . ” Guidehouse spotted their FTA illustrate within five sidereal day of the marketer ’s surety plot of land , but the terror doer had already chop the divine service at that aim . Morgan Stanley take that 108 hoi polloi in New Hampshire were touch on by the consequence , but the patronage has n’t enounce how many to a greater extent masses were affect . In the varsity letter , Morgan Stanley underline that “ any data point within these Indian file did not bear watchword that might be utilize to accession financial calculate . ”