Filch Stealer: A new infostealer leveraging old techniques


In recent weeks, Rapid7 has observed an increased volume of incidents involving domains generated by domain generation algorithms (DGAs).

DGAs are a known technique leveraged by malware authors to quickly create a large number of domain names, which will point to command and control (C2) servers operated by the attackers. Observed domains shared multiple commonalities such as .infotop-level domains and a fixed length of 24 alphanumeric characters. Attacks that start with a ClickFix social engineering lure quickly morph into more sophisticated campaigns using PowerShell scripts hosted on a remote server for in-memory execution of obfuscated .NET loader, which in turn injects a newly-discovered infostealer into MSBuild.exe via process hollowing.

Read more…
Source: Rapid7


Sign up for our Newsletter
The latest news and insights delivered right to your inbox.


Related:

  • Trellix confirms data breach after hack of ‘a portion’ of its source code

    May 5, 2026

    Cybersecurity giant Trellix has confirmed suffering a cyberattack in which threat actors accessed parts of its source code. In a brief announcement published on its website, Trellix said it had identified “unauthorized access to a portion of source code repository”. As soon as it spotted the intrusion, the company brought in third-party security experts to ...

  • Quasar Linux (QLNX) – Inside a Full-Featured Linux RAT

    May 4, 2026

    In previous research, Trend Micro have demonstrated how AI can be used to improve detection accuracy when new malware families emerge, particularly those that reuse or share code from open-source repositories. In this blog entry, Trends Micro researchers present another compelling finding from the same approach. Trend Micro platform recently flagged an unusual Linux implant with ...

  • Thousands of Facebook accounts stolen by phishing emails sent through Google

    May 4, 2026

    Researchers have uncovered a long-running phishing operation that abuses trusted Google services to hijack tens of thousands of Facebook accounts. The compromised Facebook accounts are mainly business and advertiser profiles, which criminals can monetize after gaining access and control. The attackers found a way to send phishing emails that come “through Google,” making them look legitimate ...

  • Employees are now more dangerous to their company than external hackers

    May 4, 2026

    New data from Orange Cyberdefense has suggested the biggest risks companies face could now be coming from inside, with internal threats rising from 47% to 57% in the space of less than a year. For the first time ever, internal threats have become more common that external ones, with hacking remaining pretty steady at 31% of ...

  • Hackers crawled Canadian streets with SMS blasters causing 13 million network disruptions

    May 1, 2026

    Authorities in Canada have disclosed details of a mobile cyber operation that relied on SMS blasters mounted inside vehicles moving through urban areas. Three suspects drove around downtown Toronto with these hidden devices running in their cars, impersonating cell towers. The Toronto Police Service confirmed that this marked the first operation of its kind ever recorded ...

  • Pro-Iran crew turns DDoS into shakedown as Ubuntu com stays down

    May 1, 2026

    Canonical says its web infrastructure is under attack after a pro-Iran hacktivist group instructed its members to target the open source giant. “I can confirm that Canonical’s web infrastructure is under a sustained, cross-border Distributed Denial of Service (DDoS) attack” a Canonical spokesperson told The Register. “Our teams are working to restore full availability to all ...