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The hacker believed to be linked to Russian military intelligence agency 'Fancy Bear', also breached the contact information for staff members, campaign aides and former congressional Democrats, including House Minority Leader Nancy Pelosi.
“Guccifer 2.0” also uploaded files to a blog post that contains login information to subscription services used by the Democratic Congressional Campaign Committee, including Lexis-Nexis and Washington newspapers.
The Guccifer 2.0 Twitter account said that it would provide “the major trove” of stolen information from the DCCC, including emails, to WikiLeaks, which has already published information from a similar breach of the Democratic National Committee. The same Twitter account sent a message to The Wall Street Journal that said the hacker had acted alone, not as part of a team.
Hours after the information was posted online, an email list-serve run by the Democratic Caucus sent a notice to recipients informing them to “change passwords to all email accounts that you use” and also to “strongly consider changing your non-House email addresses if possible.” The mail also asked them to “be extremely suspicious” before opening any emailed links or attachments and to consider changing passwords for banking accounts, among other things.
A number of US intelligence officials believe the most likely culprit for stealing the DCCC data, as well as a large batch of records from the Democratic National Committee, are hackers backed by the Russian government.