Cybercriminals Deploy Sophisticated Malware Through Deceptive Social Engineering Tactics

A notorious cybercrime syndicate known as Velvet Tempest has been identified leveraging deceptive ClickFix methods alongside standard Windows tools to distribute DonutLoader malicious software and the CastleRAT remote access trojan.

Security analysts from MalBeacon, a specialized cyber-deception intelligence company, documented the criminal group's operations within a simulated corporate network spanning nearly two weeks of continuous monitoring.

The threat collective, alternatively designated as DEV-0504 by security researchers, represents a persistent ransomware affiliate operation that has maintained active criminal campaigns for no less than half a decade.

Throughout their operational history, this adversarial group has established connections to numerous high-impact ransomware families that have caused widespread damage across global networks.

Their criminal portfolio includes deployment of Ryuk ransomware during the 2018-2020 timeframe, followed by involvement with REvil operations between 2019 and 2022, and participation in Conti campaigns throughout a similar period.

Subsequently, the group expanded their ransomware arsenal to include BlackMatter variants, BlackCat/ALPHV strains active from 2021 through 2024, LockBit deployments, and most recently RansomHub operations.

This extensive track record demonstrates the group's adaptability and persistent threat presence within the ransomware ecosystem, continuously evolving their techniques and affiliations to maximize criminal impact.

A replica environment for a U.S. non-profit,

with thousands of endpoints and users,

was the stage for a recent campaign.

Between early and mid-February,

hands-on keyboard activities commenced.

These included profiling the environment,

conducting host discovery,

and performing Active Directory reconnaissance.

A PowerShell script was deployed,

aimed at harvesting credentials from Chrome.

This script originated from an IP address

previously associated with staging tools

for Termite ransomware operations.

Initial access, researchers noted,

was achieved via a malvertising scheme.

This led victims to a ClickFix and captcha prompt,

which instructed them to paste

an obfuscated command into the Windows Run dialog.

A recent attack chain leveraged nested cmd.exe executions

and finger.exe to retrieve initial malware loaders,

with one payload masquerading as a PDF archive.

PowerShell was then utilized to fetch and run commands,

compiling .NET components in temporary locations via csc.exe

and deploying Python-based elements for persistence in c:\programdata.

The final stages involved loading DonutLoader

to deploy the CastleRAT backdoor,

a remote access trojan linked to the CastleLoader malware distributor

known for spreading stealers like Lumma.

Termite ransomware, linked to breaches at companies

such as Blue Yonder and Genea,

was not deployed in this observed intrusion,

though the actor typically conducts double-extortion campaigns.

The ClickFix social engineering method,

also adopted by groups like the Interlock ransomware gang,

was employed in this attack vector.

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