Friday, December 1, 2023

Visa Warns of JavaScript Skimmer Baka that Steals Payment Card Data

Visa warns of a new e-commerce skimmer dubbed Baka that loads malware dynamically to avoid static malware scanners and unique encryption to obfuscate the malicious code for every client.

Visa Payment Fraud Disruption (PFD) observed this skimmer across several merchant websites across multiple global regions.

Baka JavaScript Skimmer

PFD observed that seven C2 servers hosting the Baka skimming kit, the skimmer includes features that are common for an e-commerce skimmer such as data exfiltration from the target fields.

Based on its advanced design Baka believed to be created by a skilled developer, the most compelling features of the skimmer is it’s unique loader and obfuscation method.

The skimmer variant is designed to remove itself from memory when it detects any possibility of dynamic analysis with developer tools, this method is to avoid detection and analysis.

The Baka loader script works dynamically by adding a script tag to the current page that loads the remote JavaScript file.

When the user reaches the checkout page the loader executes the malicious skimming code, then it decrypts the skimming code and executes it in memory. The skimming code executes dynamically so it never present on the merchant’s server or saved to the customer’s computer.

Once the skimmer gets executed it captures the data from the checkout form, it keeps on scanning the fields for every 100 milliseconds. If it fetches the data then it sets a flag called ‘this.load’ indicating the skimmer successfully exfiltrated data.

The last process of the skimmer is cleaning up if the data is exfiltrated successfully it removes the entire skimming code from memory to avoid detection.

Visa asks merchants to regularly scan and test eCommerce sites for vulnerabilities or malware, ensure shopping carts, other services, and all software are upgraded or patched.

You can follow us on LinkedinTwitterFacebook for daily Cybersecurity updates

Also Read:

Lazarus APT Hackers Attack Japanese Organization Using Remote SMB Tool “SMBMAP” After Network Intrusion

PoetRAT – New Python RAT Attacking Government and Energy Sector Via Weaponized Word Documents

Website

Latest articles

Hackers Using Weaponized Invoice to Deliver LUMMA Malware

Hackers use weaponized invoices to exploit trust in financial transactions, embedding malware or malicious...

US-Seized Crypto Currency Mixer Used by North Korean Lazarus Hackers

The U.S. Treasury Department sanctioned the famous cryptocurrency mixer Sinbad after it was claimed...

CISA Warns Hackers Exploiting Wastewater Systems Logic Controllers

In a disconcerting turn of events, cyber threat actors have set their sights on...

Zyxel Command Injection Flaws Let Attackers Run OS Commands

Three Command injection vulnerabilities have been discovered in Zyxel NAS (Network Attached Storage) products,...

North Korean Hackers Attacking macOS Using Weaponized Documents

Hackers often use weaponized documents to exploit vulnerabilities in software, which enables the execution...

Most Popular Websites Still Allow Users To Have Weak Passwords

The latest analysis shows that tens of millions of people are creating weak passwords...

Chrome Zero-Day Vulnerability That Exploited In The Wild

Google has fixed the sixth Chrome zero-day bug that was exploited in the wild this...

API Attack Simulation Webinar

Live API Attack Simulation

In the upcoming webinar, Karthik Krishnamoorthy, CTO and Vivek Gopalan, VP of Products at Indusface demonstrate how APIs could be hacked.The session will cover:an exploit of OWASP API Top 10 vulnerability, a brute force account take-over (ATO) attack on API, a DDoS attack on an API, how a WAAP could bolster security over an API gateway

Related Articles