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The author of the Butterfly Bot, Matjaz Skorjanc, also known by his underground name, Iserdo, will be doing four years and ten months in prison after his sentencing last week by the District Court in Maribor, Slovenia.

In addition, Skorjanc’s girlfriend, Nusa Coh, received 8 months probation for money laundering.

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The court found Skorjanc of manufacturing “instruments intended for the breaking or illegal entry into the information system” and money laundering. He also must pay a $4077 fine (€3,000) and had his apartment and car confiscated. Police said the items ended up purchased with the proceeds of crime.

After a joint action with FBI and Spanish Guardia Civil, Slovenian police busted Skorjanc, 27, a former Computer Science student.

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Skorjanc was the author of the Butterfly Bot which ended up sold to a Spanish criminal group that used it to build the Mariposa botnet. The estimates for a number of infected systems range from 8 to 12 million bots.

The prosecution estimated the total damage caused by the malware is several tens of millions of Euros. Money from the bot sales ended up handled by Nusa Coh who said that she was not aware of the illegality of her role.

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