CyberHappenings logo

Track cybersecurity events as they unfold. Sourced timelines. Filter, sort, and browse. Fast, privacy‑respecting. No invasive ads, no tracking.

Brazilian Phishing Scams Leveraging AI Tools and Efimer Trojan Targeting Crypto Users

First reported
Last updated
1 unique sources, 1 articles

Summary

Hide ▲

A phishing campaign in Brazil is using AI-powered website building tools to create replica phishing pages mimicking government agencies. The campaign targets users to make payments via the PIX system and collect sensitive personal information. Additionally, a mass mailing campaign is distributing the Efimer Trojan, which steals cryptocurrency from victims. The Efimer Trojan has impacted 5,015 users, primarily in Brazil and other countries. The phishing campaign employs SEO poisoning to increase visibility and uses staged data collection to enhance legitimacy. The Efimer Trojan spreads via compromised WordPress sites, email, and malicious torrents, and can extend its capabilities with additional scripts.

Timeline

  1. 08.08.2025 19:14 1 articles · 1mo ago

    AI-Powered Phishing Campaign Targets Brazilian Government Agencies

    A phishing campaign in Brazil uses AI-powered website building tools to create replica phishing pages mimicking government agencies. The campaign targets users to make payments via the PIX system and collect sensitive personal information. The phishing pages use SEO poisoning to increase visibility and staged data collection to enhance legitimacy. The Efimer Trojan, distributed via a mass mailing campaign, has impacted 5,015 users and can extend its capabilities with additional scripts. The campaign targets both individual users and corporate environments, using torrent files and claims about unauthorized use of words or phrases.

    Show sources

Information Snippets

Similar Happenings

RaccoonO365 Phishing Network Disrupted by Microsoft and Cloudflare

The RaccoonO365 phishing network, a financially motivated threat group, was disrupted by Microsoft's Digital Crimes Unit (DCU) and Cloudflare. The operation, executed through a court order in the Southern District of New York, seized 338 domains used by the group since July 2024. The network targeted over 2,300 organizations in 94 countries, including at least 20 U.S. healthcare entities, and stole over 5,000 Microsoft 365 credentials. The RaccoonO365 network operated as a phishing-as-a-service (PhaaS) toolkit, marketed to cybercriminals via a subscription model on a private Telegram channel. The group used legitimate tools like Cloudflare Turnstile and Workers scripts to protect their phishing pages, making detection more challenging. The mastermind behind RaccoonO365 is believed to be Joshua Ogundipe, who received over $100,000 in cryptocurrency payments. The group is also suspected to collaborate with Russian-speaking cybercriminals. Cloudflare executed a three-day 'rugpull' against RaccoonO365, banning all identified domains, placing interstitial 'phish warning' pages, terminating associated Workers scripts, and suspending user accounts to prevent re-registration.

Increased Browser-Based Attacks Targeting Business Applications

Browser-based attacks targeting business applications have surged, exploiting modern work practices and decentralized internet apps. These attacks, including phishing, malicious OAuth integrations, and browser extensions, compromise business apps and data by targeting users. The attacks leverage various delivery channels and evasion techniques, making them difficult to detect and block. Phishing attacks have evolved to use non-email channels such as social media, instant messaging apps, and malicious search engine ads. These attacks often bypass traditional email security controls and are harder to detect. Attackers exploit the decentralized nature of modern work environments, targeting users across multiple apps and communication channels. Non-email phishing attacks can result in significant breaches, as seen in the 2023 Okta breach. The rise in these attacks highlights the need for enhanced browser security measures and better visibility into user activities within the browser.

Axios and Direct Send Abuse in Microsoft 365 Phishing Campaigns

Threat actors are exploiting HTTP client tools like Axios and Microsoft's Direct Send feature to create highly efficient phishing campaigns targeting Microsoft 365 environments. These attacks, which began in July 2025, initially targeted executives and managers in finance, healthcare, and manufacturing sectors, but have since expanded to all users. The campaigns use compensation-themed lures to trick recipients into revealing credentials and bypassing multi-factor authentication (MFA). The abuse of Axios has surged, accounting for 24.44% of all flagged user agent activity from June to August 2025. The attacks leverage Axios to intercept, modify, and replay HTTP requests, capturing session tokens or MFA codes in real-time. This method allows attackers to bypass traditional security defenses and conduct phishing operations at an unprecedented scale. Additionally, a phishing-as-a-service (PhaaS) offering called Salty 2FA has been discovered, which steals Microsoft login credentials and sidesteps MFA by simulating various authentication methods. Salty 2FA uses advanced features such as subdomain rotation, dynamic corporate branding, and sophisticated evasion tactics to enhance its phishing campaigns. It also abuses legitimate platforms to stage initial attacks and uses Cloudflare Turnstile for secure CAPTCHA replacement. Salty2FA campaigns have been active since late July 2025 and continue to this day, generating dozens of fresh analysis sessions daily. The campaigns target industries including finance, healthcare, government, logistics, energy, IT consulting, education, construction, telecom, chemicals, industrial manufacturing, real estate, and consulting.

MostereRAT Malware Campaign Targets Japanese Windows Users

A new malware campaign using MostereRAT, a banking malware-turned-RAT, targets Japanese Windows users. The malware employs sophisticated evasion techniques, including the use of an obscure programming language and disabling of security tools, to maintain long-term access and control over compromised systems. The campaign begins with phishing emails that lure victims into downloading a malicious Word document. Once installed, MostereRAT deploys multiple modules to achieve persistence, privilege escalation, and remote access. The malware is designed to evade detection and disable various antivirus and endpoint detection and response (EDR) products, making it difficult for defenders to detect and mitigate the threat. The primary goal of MostereRAT is to maintain persistent control over compromised systems, maximize the utility of victim resources, and retain ongoing access to valuable data. The malware uses mutual TLS (mTLS) to secure command-and-control (C2) communications and can monitor foreground window activity associated with Qianniu - Alibaba's Seller Tool. It can also perform Early Bird Injection to inject an EXE into svchost.exe.

GhostRedirector Campaign Targets Windows Servers with Rungan Backdoor and Gamshen IIS Module

The GhostRedirector threat cluster, also known as Operation Rewrite and CL-UNK-1037, has compromised at least 65 Windows servers in Brazil, Thailand, and Vietnam, deploying the Rungan backdoor and Gamshen IIS module. The campaign, active since at least March 2025, targets various sectors and uses SEO fraud to manipulate search engine results, particularly to boost the rankings of gambling websites. The threat actor, believed to be China-aligned, employs BadIIS, a malicious native IIS module, to intercept and modify HTTP traffic, serving malicious content to site visitors. The campaign also deploys other tools for remote access, privilege escalation, and information gathering. ESET recommends using dedicated accounts, strong passwords, and multifactor authentication for IIS server administrators, as well as ensuring native IIS modules are installed only from trusted sources and are signed by a trusted provider.