Emotet

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Emotet is a malware strain and a cybercrime operation believed to be based in Ukraine.[1] The malware, also known as Heodo, was first detected in 2014 and deemed one of the most prevalent threats of the decade.[2][3][4] In 2021 the servers used for Emotet were disrupted through global police action in Germany and Ukraine and brought under the control of law enforcement.[4]

First versions of the Emotet malware functioned as a banking trojan aimed at stealing banking credentials from infected hosts. Throughout 2016 and 2017, Emotet operators, sometimes known as Mealybug, updated the trojan and reconfigured it to work primarily as a "loader," a type of malware that gains access to a system, and then allows its operators to download additional payloads.[5] Second-stage payloads can be any type of executable code, from Emotet's own modules to malware developed by other cybercrime gangs.

Initial infection of target systems often proceeds through a macro virus in an email attachment. The infected email is a legitimate-appearing reply to an earlier message that was sent by the victim.[6]

It has been widely documented that the Emotet authors have used the malware to create a botnet of infected computers to which they sell access in an Infrastructure-as-a-Service (IaaS) model, referred in the cybersecurity community as MaaS (Malware-as-a-Service), Cybercrime-as-a-Service (CaaS), or Crimeware.[7] Emotet is known for renting access to infected computers to ransomware operations, such as the Ryuk gang.[8]

As of September 2019, the Emotet operation ran on top of three separate botnets called Epoch 1, Epoch 2, and Epoch 3.[9]

In July 2020, Emotet campaigns were detected globally, infecting its victims with TrickBot and Qbot, which are used to steal banking credentials and spread inside networks. Some of the malspam campaigns contained malicious documents with names such as "form.doc" or "invoice.doc". According to security researchers, the malicious document launches a PowerShell script to pull the Emotet payload from malicious websites and infected machines. [10]

In November 2020, Emotet used parked domains to distribute payloads. [11]

In January 2021, international action coordinated by Europol and Eurojust allowed investigators to take control of and disrupt the Emotet infrastructure.[12] The reported action was accompanied with arrests made in Ukraine.[13]

On 14 November 2021, new Emotet samples emerged that were very similar to the previous bot code, but with a different encryption scheme that used elliptic curve cryptography for command and control communications.[14] The new Emotet infections were delivered via TrickBot, to computers that were previously infected with TrickBot, and soon began sending malicious spam email messages with macro-laden Microsoft Word and Excel files as payloads.[15]

Noteworthy infections[edit]

References[edit]

  1. ^ Ikeda, Scott (August 28, 2020). "Emotet Malware Taken Down By Global Law Enforcement". Cpomagazine. Retrieved May 1, 2021.
  2. ^ "Emotet's Malpedia entry". Malpedia. January 3, 2020.
  3. ^ Ilascu, Ionut (December 24, 2019). "Emotet Reigns in Sandbox's Top Malware Threats of 2019". Bleeping Computer.
  4. ^ a b European Union Agency for Criminal Justice Cooperation (January 27, 2021). "World's most dangerous malware EMOTET disrupted through global action". Eurojust.
  5. ^ Christiaan Beek. "Emotet Downloader Trojan Returns in Force". McAfee.
  6. ^ a b Schmidt, Jürgen (June 6, 2019). "Trojaner-Befall: Emotet bei Heise" (in German). Heise Online. Retrieved November 10, 2019.
  7. ^ Brandt, Andrew (December 2, 2019). "Emotet's Central Position in the Malware Ecosystem". Sophos. Retrieved September 19, 2019.
  8. ^ "North Korean APT(?) and recent Ryuk Ransomware attacks". Kryptos Logic.
  9. ^ Cimpanu, Catalin (September 16, 2019). "Emotet, today's most dangerous botnet, comes back to life". ZDnet. Retrieved September 19, 2019.
  10. ^ "July 2020's Most Wanted Malware: Emotet Strikes Again After Five-Month Absence".
  11. ^ "Emotet uses parked domains to distribute payloads". How To Fix Guide. October 30, 2020. Retrieved January 27, 2021.
  12. ^ "World's most dangerous malware EMOTET disrupted through global action". Europol. Retrieved January 27, 2021.
  13. ^ Cimpanu, Catalin, Authorities plan to mass-uninstall Emotet from infected hosts on March 25, 2021, zdnet, January 27, 2021
  14. ^ "Emotet botnet returns after law enforcement mass-uninstall operation". The Records. Retrieved November 20, 2021.
  15. ^ "Emotet Returns". SANS Internet Storm Center. Retrieved November 20, 2021.
  16. ^ "Malware infection poised to cost $1 million to Allentown, Pa". washingtontimes.com. The Washington Times. Retrieved November 12, 2019.
  17. ^ "Emotet malware gang is mass-harvesting millions of emails in mysterious campaign". zdnet.com. ZDNet. Retrieved November 12, 2019.
  18. ^ "Emotet: Trojaner-Angriff auf Berliner Kammergericht". spiegel.de (in German). Der Spiegel. Retrieved November 12, 2019.
  19. ^ "Emotet: Wie ein Trojaner das höchste Gericht Berlins lahmlegte". faz.net (in German). Frankfurter Allgemeine Zeitung. Retrieved November 12, 2019.
  20. ^ "Trojaner greift Netzwerk von Humboldt-Universität an". dpa (in German). Heise Online. November 9, 2019. Retrieved November 10, 2019.
  21. ^ "Trojaner-Befall: Uni Gießen nutzt Desinfec't für Aufräumarbeiten" (in German). Heise Online. December 19, 2019. Retrieved December 22, 2019.
  22. ^ Joncas, Hugo. "Les pirates informatiques ont pu voler tous les courriels". Le Journal de Montréal. Retrieved January 27, 2021.
  23. ^ "Several institutions affected by email virus in Lithuania – center". www.baltictimes.com. Retrieved January 27, 2021.