As the tax deadline looms, cybercriminals are seizing the opportunity to exploit anxious taxpayers. Microsoft has sounded the alarm on a new surge of sophisticated phishing scams that are preying on individuals during the 2025 tax season.

From fake IRS communications to malicious PDFs and QR codes, scammers are using increasingly deceptive methods to trick users into handing over sensitive information or installing malware.

These phishing campaigns are engineered to deliver a variety of dangerous payloads including Latrodectus, BruteRatel C4, and AHKBot. They also often deploy remote access trojans (RATs), enabling hackers to take over infected systems, steal financial data, or commit identity theft.

The fraudulent emails appear convincing, often featuring urgent subject lines such as "Unusual Activity Detected in Your IRS Filing" or "Important Action Required: IRS Audit." With one click, users are redirected to fake websites—like spoofed DocuSign pages—that automatically trigger malware downloads.

In some cases, scammers are playing the long game. One tactic involves emails from fake "clients" claiming tax-related emergencies due to past CPA errors. A response to these emails could lead to receiving a malicious attachment disguised as a tax document.

Microsoft has flagged a particularly stealthy campaign aimed at accountants. The bait? A malware-laced PDF that deploys GuLoader, a tool that leverages encrypted shellcode and cloud-based services to bypass standard security protocols. Once installed, Remcos, a remote access trojan, takes over the device, allowing hackers to manipulate files or exfiltrate data unnoticed.

“Scammers thrive on panic, so don't let them rush you. Always double-check sender addresses, avoid clicking links in unexpected emails, and never download attachments unless you're absolutely certain they're safe,” the advisory warns.

The IRS, it’s important to note, does not contact individuals via email, text, or social media for sensitive information.

Microsoft reassures users that their security solutions are actively combating these threats.

“Defender for Office 365 automatically flags and blocks phishing emails and malicious attachments, while Defender for Endpoint provides comprehensive protection across devices.”

With awareness and caution, individuals can better protect themselves from falling victim during this high-risk season.