Dutch Banking Malware Gang Busted: Bitcoins Role

Dutch police arrest four men on charges of using TorRAT banking malware to steal an estimated $1.4 million from consumers. They allegedly laundered the funds using the cryptographic currency known as Bitcoins.

Dutch cybercrime police last week busted four men on charges that they used the banking malware known as TorRAT to steal an estimated $1.4 million from consumers, which they allegedly laundered using the cryptographic currency known as Bitcoins.
TorRAT is a remote-access Trojan (RAT), designed to steal online banking information, which receives command-and-control (C&C) instructions via the anonymizing Tor network. By using Tor, the botnets operators can disguise the commands they send to infected PCs and hide the flow of stolen data being transmitted from infected PCs to attacker-controlled servers.
The Windows malware was distributed in part via hacked Twitter feeds, but largely via phishing attacks written in Dutch that targeted online banking users in the Netherlands. Users fell victim to this threat by clicking fake invoices in specially crafted spammed messages, said Trend Micro senior threat researcher Feike Hacquebord in a
blog post
. These invoices did not have the usual grammar and spelling errors like the ones in typical spam runs sent by fellow con men who are not native speakers.
Police said the TorRAT gang coordinated their operations using Tor Mail -- which was designed to provide users with anonymous, private communications -- and ultimately stole funds from at least 150 Dutch bank accounts.
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Stealing victims money was the easy part. Actually converting it to cash was much more difficult, and a single mistake might leave clues that authorities could trace back to the gang members real identity. It is relatively straightforward to manipulate bank transactions on an infected computer. But you need mules for laundering stolen money, said Hacquebord. The Dutch gang allegedly laundered money through Bitcoin transactions and even set up their own Bitcoin exchange service -- FBTC Exchange -- that went dark after the arrests.
The Dutch investigation also resulted in police seizing from the TorRAT gang 56 Bitcoins, which authorities exchanged for over 7,700 euros ($10,000).
How did Dutch computer crime police trace the men? While authorities havent revealed what tipped them off, the arrests may have resulted directly from an
FBI sting operation
earlier this year that resulted in the arrest in Dublin of 28-year-old Eric Eoin Marques on child pornography distribution charges. Marques was also accused of being the operator of Freedom Hosting, which hosted multiple anonymous Tor software services, including Tor Mail, although the hosting service wasnt affiliated with the Tor Project.
The FBI apparently hacked into the Freedom Hosting site and made it serve malware that targeted a bug -- since patched -- in the Firefox browser that underpins the Tor Browser Bundle (TBB), which is the easiest way to access the anonymizing Tor network. The malware planted a tracking ID onto a TBB-using PC, which allowed the FBI to trace the IP address for the computer, helping it identify the user. Accordingly, the FBI may have shared the real IP addresses of the alleged Tor Mail-using TorRAT gang members with Dutch police.
Last weeks takedown of the alleged TorRAT gang also followed the
arrest
earlier this month of Ross William Ulbricht, 29. The FBI accused Ulbricht, aka Dread Pirate Roberts, of running the notorious online narcotics marketplace known as the Silk Road. Reachable only via the Tor network, the site generated more than $1.2 billion in sales and $80 million in commissions during the more than two years in which it operated, authorities estimated. But even the combination of using Bitcoins as currency and the Tor network to hide participants identities didnt prevent the FBI from tracing transactions back to the online marketplaces alleged owner.
Last week, the FBI announced that it had seized a second stash of Bitcoins belonging to Ulbricht, which brought the total number of seized Bitcoins to 173,991. At current Bitcoin exchange rates, they would be worth more than $34.1 million.

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Dutch Banking Malware Gang Busted: Bitcoins Role