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Many botnets are used as malware droppers, and once a system is compromised the bot can drop future unwanted files and even other malware. Others use compromised devices to spread spam and increase the size of their botnets.

Botnets can be used by malware authors to bring down websites using distributed denial of service (DDoS) attacks. The bot continues to be developed to become more effective over time:įigure 1: Various capabilities of botnets Malware Botnetsīotnets can come in various sizes and with various capabilities. In 2017, the malware started to target European banks from nations like the United Kingdom and France. This in turn leads to its victims inputting sensitive details into these phony banking sites, leading to their accounts being compromised. The malware’s main function is to use man-in-the-middle (MITM) attacks on users visiting banking websites to falsify the appearance of these sites using web-injects. In the last three years this has been the case as the malware first seen in the wild has now dropped many new variations of itself and many new DLL modules to increase is capabilities. It can also download updated versions of its DLLs as well as new modules. If one of its components is forcefully removed the malware will simply pull another instance of the component from its infrastructure due to its persistence techniques. To increase the spread of the attack across the network, the malware has two separate worm modules which spread laterally to increase further damage across the local network.ĭue to the malware's modular approach, removal and detection on systems can be difficult. The malware also has a few reconnaissance DLL files to gain an insight into the infected victim's device and network.

These DLL files each have unique features to increase the amount of confidential and private information the malware can steal. Once downloaded, the malware tries to connect to its command and control (C2) infrastructure, and on making successful connection with its servers it begins to pull numerous files. The malware can also spread to devices on local networks due to its laterally moving worm module. bat script which then utilizes PowerShell.exe to download the malware. Once this is done the macro uses a small. Typically, a document requests the unsuspecting user to enable editing of the document. These malicious emails tend to come in the form of fake banking notifications purporting to be from popular online hosting and payment services, tricking the user into clicking on them. The malware is dropped by a user clicking on malicious emails or being redirected to an illegitimate website.

The predecessor of Dyre, the bot is normally deployed using malicious spam and advertising techniques. TrickBot is an info-stealing malware bot that has been in the wild since 2016. Threat Spotlight: TrickBot Infostealer Malware