Dear All,

We are excited to invite you to an upcoming DFIR Stream 0xE webinar: Title: “Identifying Fraudulent CAPTCHA Solvers Using Network Propagation Analysis”

Presenters: -Martynas Buožis — Information Security Architect, Amadeus Data Processing GmbH -Umberto Fontana — PhD Candidate, Telecom SudParis & Amadeus IT Group

Abstract: Malicious actors often use CAPTCHA Farms to bypass bot protection, enabling fraud such as inventory denial and SMS pumping. These farms cleverly mirror IP addresses and client fingerprints, making traditional detection methods ineffective. Meanwhile, their CAPTCHA-solving times are indistinguishable from legitimate users.

In this talk, our speakers will present a novel technique for uncovering the use of CAPTCHA Farms by analyzing network propagation times. By comparing observed delays with the geographic distances implied by IP addresses, this approach aims to statistically identify suspicious patterns.

- Date & Time: Tuesday, March 25, 2:00 – 3:00 pm (GMT+00:00) - Location: Online (Pre-registration required) - Event Registration Link: https://www.acfti.org/news-events/dfir-stream-0xe - Online Registration Ends: March 23 at 04:00 PM (GMT+00:00)

Don’t miss this chance to learn about cutting-edge research on detecting fraudulent CAPTCHA solvers and to provide valuable feedback!

======Housekeeping Notes======

- Note that this event is online only. Hence, You must register to receive a link to connect. Due to limited availability, we kindly ask you to register as soon as possible to ensure your participation in the webinar of your choice.

Finally, I would like to remind you that the call for speakers is currently open on the dedicated DFIR stream website, https://dfir.stream/call-for-guest-speakers

#CyberSecurity #DFIR #CAPTCHA #OnlineFraud

Best regards, Andrew Zayin Ph.D., CISSP, CISM, CRISC, CDPSE, PMP ACFTI Secretariat