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This Malware Installs Malicious Browser Extensions to Steal Users' Passwords and Cryptos

This Malware Installs Malicious Browser Extensions to Steal Users' Passwords and Cryptos

Nov 22, 2022
A malicious extension for Chromium-based web browsers has been observed to be distributed via a long-standing Windows information stealer called ViperSoftX . Czech-based cybersecurity company dubbed the rogue browser add-on VenomSoftX owing to its standalone features that enable it to access website visits, steal credentials and clipboard data, and even swap cryptocurrency addresses via an adversary-in-the-middle (AiTM) attack. ViperSoftX, which first  came to light  in February 2020, was characterized by  Fortinet  as a JavaScript-based remote access trojan and cryptocurrency stealer. The malware's use of a browser extension to advance its information-gathering goals was documented by Sophos threat analyst  Colin Cowie  earlier this year. "This multi-stage stealer exhibits interesting hiding capabilities, concealed as small PowerShell scripts on a single line in the middle of otherwise innocent-looking large log files, among others," Avast researcher Jan Rubín  said
Experts Warn of Browser Extensions Spying On Users via Cloud9 Chrome Botnet Network

Experts Warn of Browser Extensions Spying On Users via Cloud9 Chrome Botnet Network

Nov 09, 2022
The Keksec threat actor has been linked to a previously undocumented malware strain, which has been observed in the wild masquerading as an extension for Chromium-based web browsers to enslave compromised machines into a botnet. Called  Cloud9  by security firm Zimperium, the malicious browser add-on comes with a wide range of features that enables it to siphon cookies, log keystrokes, inject arbitrary JavaScript code, mine crypto, and even enlist the host to carry out DDoS attacks. The extension "not only steals the information available during the browser session but can also install malware on a user's device and subsequently assume control of the entire device," Zimperium researcher Nipun Gupta  said  in a new report. The JavaScript botnet isn't distributed via Chrome Web Store or Microsoft Edge Add-ons, but rather through fake executables and rogue websites disguised as Adobe Flash Player updates. Once installed, the extension is designed to inject a JavaScr
Microsoft Warns of Large-Scale Click Fraud Campaign Targeting Gamers

Microsoft Warns of Large-Scale Click Fraud Campaign Targeting Gamers

Sep 19, 2022
Microsoft said it's tracking an ongoing large-scale click fraud campaign targeting gamers by means of stealthily deployed browser extensions on compromised systems. "[The] attackers monetize clicks generated by a browser node-webkit or malicious browser extension secretly installed on devices," Microsoft Security Intelligence said in a sequence of tweets over the weekend. The tech giant's cybersecurity division is tracking the developing threat cluster under the name DEV-0796. Attack chains mounted by the adversary commence with an ISO file that's downloaded onto a victim's machine upon clicking on a malicious ad or comments on YouTube. The ISO file, when opened, is designed to install a browser node-webkit (aka  NW.js ) or rogue browser extension. It's worth noting that the  ISO file  masquerades as hacks and cheats for the Krunker first-person shooter game. Cheats are programs that help gamers gain an added advantage beyond the available capabili
Malicious Browser Extensions Targeted Over a Million Users So Far This Year

Malicious Browser Extensions Targeted Over a Million Users So Far This Year

Aug 17, 2022
More than 1.31 million users attempted to install malicious or unwanted web browser extensions at least once, new findings from cybersecurity firm Kaspersky show. "From January 2020 to June 2022, more than 4.3 million unique users were attacked by adware hiding in browser extensions, which is approximately 70% of all users affected by malicious and unwanted add-ons," the company  said . As many as 1,311,557 users fall under this category in the first half of 2022, per Kaspersky's telemetry data. In comparison, the number of such users peaked in 2020 at 3,660,236, followed by 1,823,263 unique users in 2021. The most prevalent threat is a family of adware called WebSearch, which masquerade as PDF viewers and other utilities, and comes with capabilities to collect and analyze search queries and redirect users to affiliate links. WebSearch is also notable for modifying the browser's start page, which contains a search engine and a number of links to third-party sour
Here's How to Find if WhatsApp Web Code on Your Browser Has Been Hacked

Here's How to Find if WhatsApp Web Code on Your Browser Has Been Hacked

Mar 11, 2022
Meta Platforms' WhatsApp and Cloudflare have banded together for a new initiative called Code Verify to validate the authenticity of the messaging service's web app on desktop computers. Available in the form of a Chrome and Edge  browser extension , the  open-source add-on  is designed to "automatically verif[y] the authenticity of the WhatsApp Web code being served to your browser," Facebook  said  in a statement. The goal with Code Verify is to confirm the integrity of the web application and ensure that it hasn't been tampered with to inject malicious code. The social media company is also planning to release Firefox and Safari plugins to achieve the same level of security across browsers. The system works with Cloudflare acting as a third-party audit to compare the cryptographic hash of WhatsApp Web's JavaScript code that's shared by Meta with that of a locally computed hash of the code running on the browser client. Code Verify is also meant t
Chaes Banking Trojan Hijacks Chrome Browser with Malicious Extensions

Chaes Banking Trojan Hijacks Chrome Browser with Malicious Extensions

Jan 27, 2022
A financially-motivated malware campaign has compromised over 800 WordPress websites to deliver a banking trojan dubbed Chaes targeting Brazilian customers of Banco do Brasil, Loja Integrada, Mercado Bitcoin, Mercado Livre, and Mercado Pago. First documented by  Cybereason  in November 2020, the info-stealing malware is delivered via a sophisticated infection chain that's engineered to harvest sensitive consumer information, including login credentials, credit card numbers, and other financial information. "Chaes is characterized by the multiple-stage delivery that utilizes scripting frameworks such as JScript, Python, and NodeJS, binaries written in Delphi, and malicious Google Chrome extensions," Avast researchers Anh Ho and Igor Morgenstern  said . "The ultimate goal of Chaes is to steal credentials stored in Chrome and intercept logins of popular banking websites in Brazil." The attack sequence is triggered when users visit one of the infected websites
Over a Dozen Chrome Extensions Caught Hijacking Google Search Results for Millions

Over a Dozen Chrome Extensions Caught Hijacking Google Search Results for Millions

Feb 03, 2021
New details have emerged about a vast network of rogue extensions for Chrome and Edge browsers that were found to hijack clicks to links in search results pages to arbitrary URLs, including phishing sites and ads. Collectively called " CacheFlow " by Avast, the 28 extensions in question — including Video Downloader for Facebook, Vimeo Video Downloader, Instagram Story Downloader, VK Unblock — made use of a sneaky trick to mask its true purpose: Leverage  Cache-Control  HTTP header as a covert channel to retrieve commands from an attacker-controlled server. All the  backdoored browser add-ons  have been taken down by Google and Microsoft as of December 18, 2020, to prevent more users from downloading them from the official stores. According to telemetry data gathered by the firm, the top three infected countries were Brazil, Ukraine, and France, followed by Argentina, Spain, Russia, and the U.S. The CacheFlow sequence began when unsuspecting users downloaded one of the
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