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He asked that his name and the name of the company not be disclosed as they have not received clearance to discuss their role in mitigating the hack. Last August, Defense One interviewed the head of the company that the Pentagon trusted to detect and remedy the breach. HereвЂ™s the thing, while it took the DNC almost a year to realized it had been hacked, the Pentagon detected the breach of its non-classified network within days. In combination, these techniques make it particularly hard to identify HAMMERTOSS or spot malicious network traffic,вЂќ wrote the computer security firm FireEye. Individually, each technique offers some degree of obfuscation for the threat groupвЂ™s activity. вЂњWhile each technique in HAMMERTOSS is not new, APT29 has combined them into a single piece of malware. That allows it to remain difficult to detect and the upload harder to trace. At specific times, the malware checked in with a web page (algorithmically generated Twitter pages have been used for this purpose) to receive instructions on uploading data. Once an unsuspecting target opened an email from the group and downloaded the virus via a link, the malware installed itself and began using Microsoft Active Directory to move laterally among computers in the (Windows server) network. In 2014, APT29 began using a backdoor malware dubbed HAMMERTOSS.

You might remove it from that machine, but by then it could have moved to somewhere else on the network.ДЄside from the perpetrator, the DNC hack bares a number of things in common with the 2015 phishing attack on the Joint ChiefвЂ™s non-classified email system.

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The malware Crowdstrike discovered on the DNC network вЂњallowed the adversary to launch malicious code automatically after a specified period of system uptime or on a specific schedule.вЂќ Basically, this means the malware can sit in the background of the network, possibly on a single machine, not drawing attention to itself, until itвЂ™s scheduled to spring into action. When specific versions are discovered that may cause issues for the RAT, it promptly exits,вЂќ CrowdstrikeвЂ™s Dmitri Alperovitch wrote in a blog post.

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The malware can check вЂњfor the various security software that is installed on the system and their specific configurations. This code lets a hacker into the system - and takes pains to keep itself hidden. But when a recipient clicks on a link, her machine will download malicious code, in the case of the DNC hack, containing a Remote Access Tool (RAT). The group is known for its spearphishing campaigns, which sends emails that appear to be from a trusted source.

On Tuesday, officials with the information security company Crowdstrike disclosed that APT29 had injected malware onto the DNC network about a year ago, enabling the hackers to pick up opposition research on Donald Trump, among other information.

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HereвЂ™s what last summerвЂ™s hack can teach you about what happened to the DNC, and how to keep it from happening again. Last year, one of the two groups, known as APT29 or COZYBEAR, broke into the Joint ChiefвЂ™s non-classified email system. The Russian hacking groups that stole the Democratic National CommitteeвЂ™s secret files on Donald Trump have plenty of experience in filching sensitive data from U.S.

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