Cyber attacks against Estonia (2007)
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|Date||27 April until May 2007 (three to four weeks of malicious activities – the end is not sharply delineated).|
|Suspected actor||Group of hackers from around the world. Allegations have been circulating about the support by the Russian Federation to the attack, always denied by the Russian government.|
|Target||The attacks were directed to both the Estonian public and private sectors. Public institutions including the websites of the Prime Minister, the Parliament and almost all of the country’s government ministries have been targeted by the attack. Private sectors such as banks, telecommunications and three of the country’s six big news organizations and two of the major Estonian banks has been targeted.|
|Target systems||Estonian essential infrastructures, telecommunications, name servers, web sites, e-mail, DNS.|
|Method||Waves of DDoS (distributed denial-of-service) attacks overloading Estonian servers. According to the Estonian Defence Minister, Jaak Aaviksoo, the attackers commanded nearly a million “zombie” computers creating a huge world-wide-network of bots in order to amplify the impact of the attack. The DDoS overflew Estonian websites with massive requests of data, increasing traffic and overloading the servers to a standoff with ping flood scripts. The analysis of the DDoS attacks by Arbor’s Security Engineering & Response Team (ASERT), showed that the largest cyber attacks caused streams of 90 megabits of data a second, lasting up to 10 hours each. |
|Purpose||The cyber attack seemed to have followed a political row in retaliation to the relocation of a Soviet “Monument to the Liberators of Estonia” from the center of Tallinn to a military cemetery on the outskirt of the city. Since the monument represents the USSR’s victory over Nazism, the relocation has been considered by Moscow an outrageous act and sparked riots in the streets of the capital city involving mostly Russian nationalists. Following the removal, the Russian foreign Minister Sergei Lavrov said Moscow would “take serious steps” even though he never specified what kind of measures.|
|Result||The attack caused email servers mainframes failures, DNS servers overloading, and damaging of routers. On 10 May, Hansabank, Estonia’s biggest bank, was forced to shut down its online service for more than an hour and blocked access to 300 suspect Internet addresses, causing a loss worth $1 million. Due to the nature of the attacks, public and private entities defended themselves by blocking the access from sources that were outside the countries, resulting in the obscuration of their websites to the rest of the world. Although disruptive, the DDoS attacks did not create any physical damage and have not risen to the level of actual cyberwarfare.|
|Aftermath||Following the three-weeks-wave of cyber attacks, Estonia launched an investigation to find the responsible with no success. Due to the nature of the attack, there has been no evidence connecting the Kremlin to the campaign. What is certain is that the act was highly coordinated and could not be the work of a single hacker, but rather a well prepared group. The Estonian government has not blamed the Russian authorities directly but its foreign ministry published a series of IP addresses, originating from Russia.|
|Analysed in||Scenario 05: State investigates and responds to cyber operations against private actors in its territory|
Collected by: Samuele De Tomas Colatin
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