Silent Skimmer Gets Loud (Again)


In late May 2024, Unit 42 researchers observed an adversary compromising multiple web servers to gain access to the environment of a multinational organization headquartered in North America.

Based on overlaps in adversary infrastructure and tools, as well as tactics, techniques and procedures (TTPs), it’s possible to attribute the activity identified to the same threat actor behind the Silent Skimmer campaign. In September 2023, an online payment scraping campaign was uncovered and dubbed Silent Skimmer. Since then, there has been little to no news of Silent Skimmer – until now.

Read more…
Source: Palo Alto Unit 42


Sign up for our Newsletter


Related:

  • Operation South Star: 0-day Espionage Campaign Targeting Domestic Mobile Phones

    November 4, 2025

    In recent years, during high-intensity confrontations with Advanced Persistent Threat (APT) groups from the Northeast Asia region, the RedDrip team at QiAnXin Threat Intelligence Center has discovered nearly 20 0day vulnerabilities involving domestic software. Some details have been disclosed in our public reports such as Operation DevilTiger, Operation ShadowTiger, and XSS 0day+Clickonce. In reality, 0day activities ...

  • Phone location data of top EU officials available for sale

    November 4, 2025

    Journalists in Europe found it was “easy” to spy on top European Union officials using commercially obtained location histories sold by data brokers, despite the continent having some of the strongest data protection laws in the world. EU officials said they’re “concerned” about the trade of citizen and officials’ mobile phone location data, and have issued ...

  • SesameOp: Novel backdoor uses OpenAI Assistants API for command and control

    November 3, 2025

    Microsoft Incident Response – Detection and Response Team (DART) researchers uncovered a new backdoor that is notable for its novel use of the OpenAI Assistants Application Programming Interface (API) as a mechanism for command-and-control (C2) communications. Instead of relying on more traditional methods, the threat actor behind this backdoor abuses OpenAI as a C2 channel as ...

  • University of Pennsylvania says it has called FBI over data breach

    November 3, 2025

    The University of Pennsylvania says it has called in the Federal Bureau of Investigation after offensive emails were distributed to alumni. In a statement, the university said that a data breach had affected “select information systems.” An email sent to University of Pennsylvania alumni on Friday and reviewed by Reuters showed that someone masquerading as the ...

  • US government warns Linux CVE-2024-1086 flaw is now being exploited for ransomware attacks

    November 3, 2025

    The US government is warning that a Linux flaw introduced more than a decade ago – and fixed more than a year ago – is being actively used in ransomware attacks. In February 2014, a vulnerability was introduced into the Linux kernel via a commit. The bug was first disclosed in late January 2024, and described ...

  • Chicago firm that resolves ransomware attacks had rogue workers carrying out their own hacks

    November 2, 2025

    Rogue employees of a Chicago company that specializes in negotiating ransoms to mitigate cyber attacks were carrying out their own piracy in a plot to extort millions of dollars from a series of companies, prosecutors say. Kevin Tyler Martin, a ransomware threat negotiator for River North-based DigitalMint at the time of the alleged conspiracy, was among ...