The DNC refused to allow the government to investigate. The government relied on the claims of the DNCs investigator, Crowdstrike Inc.
Crowdstrikes owner, Alperovitch, claims that Russia hacked the DNC email system. Alperovitch claims malware used to breach the DNC email system was previously used by Russia to attack Ukrainian troops. This forms the basis of his claim that Russia hacked the DNC.
Alperovitchs claim that Russia used this software to attack Ukrainian troops is partly based on the claims of a Russian blogger. The Russian blogger claims that Ukrainian military units were targeted via malware inserted onto Ukrainian tablet computers, the malware provided to Russia the location of Ukrainian troops, resulting in destruction of Ukrainian howitzers. To support the claim the blogger cites a 2016 International Institute for Strategic Studies (IISS) report of a sharp reduction of Ukrainian D-30 howitzers between 2013 and 2015.
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One of the IISS researchers who produced the data said that while the think tank had dramatically lowered its estimates of Ukrainian artillery assets and howitzers in 2013, it did so as part of a reassessment and reallocation of units to airborne forces.
No, we have never attributed this reduction to combat losses, the IISS researcher said, explaining that most of the reallocation occurred prior to the two-year period that CrowdStrike cites in its report.
The vast majority of the reduction actually occurs ... before Crimea/Donbass, he added, referring to the 2014 Russian invasion of Ukraine.
http://www.voanews.com/a/crowdstrike-comey-russia-hack-dnc-clinton-trump/3776067.html
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The malware has been available for years prior to the DNC breach.
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Supporting research in this thread:
http://www.freerepublic.com/focus/news/3532194/posts?q=1&;page=21