Malware actors leverage popular platforms like YouTube and social media to distribute fake installers. Reputable file hosting services are abused to host malware and make detection challenging.
Password protection and encoding techniques further complicate analysis and evade early sandbox detection. Once a system is compromised, malware can steal sensitive data from web browsers by exploiting credential storage mechanisms.
Info stealers are distributed through deceptive tactics such as fake software installers, whose download links can be found on fake websites or social media platforms.
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One common technique is for malicious actors to pose as helpful guides on video-sharing platforms and trick users into clicking on links in the description or comments that lead to download pages for the fake installers.
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File hosting services such as Mediafire and Mega.nz are also used to obscure the download source and make detection more difficult. Info stealers can be disguised as cracked software, appearing in search engine results when users look for pirated software.
An analysis revealed an adversary leveraging various platforms to distribute malicious software that include OpenSea (an NFT marketplace), SoundCloud (a music-sharing platform), and potentially others.
The attackers employed techniques such as shortened links (likely to evade scraping and analysis) and password-protected downloads (to hinder initial sandbox analysis).
Following the deobfuscation of a batch file, an AutoIt script was constructed and run after it was triggered by the execution of a large installer that was 900 megabytes in size.
The script dropped files, injected code into legitimate binaries, and stole browser credentials by leveraging DGA to communicate with its command-and-control servers, demonstrating its ability to evade detection and maintain persistence.
A trojanized installer disguised as legitimate remote desktop software (rustdesk.exe) is downloaded from a known file hosting site. The user unpacks the file with a password and executes the installer.
The installer injects malicious code into legitimate processes (more.com, StrCmp.exe, SearchIndexer.exe, and explorer.exe) to evade detection and drops additional malware.
It also creates autorun registry entries and scheduled tasks to ensure persistence and communicates with the C&C server to download more malware.
According to Trend Micro, the campaign leverages a diverse arsenal of info stealers (LUMMASTEALER, PRIVATELOADER, MARSSTEALER, AMADEY, PENGUISH, VIDAR) to evade detection.
Attackers employ various tactics, including utilizing large files to bypass sandbox analysis, encrypting payloads with password-protected ZIP archives to hinder content scanning, and distributing malware through legitimate file-sharing platforms and shortened URLs to impede proactive detection.
To combat evolving social engineering threats and advanced evasion tactics like DLL sideloading, process injection, and file obfuscation, organizations must implement a multi-layered defense.
It includes user education to recognize and avoid phishing attempts, continuous threat hunting to proactively identify and respond to emerging threats, and leveraging an MSSP for expert threat intelligence and managed security services.
By combining these measures with proactive monitoring and advanced detection capabilities, organizations can enhance their security posture and minimize the impact of sophisticated cyberattacks.
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