The Threat

Inc42 published a report regarding Juspay data being leaked on the dark web. The report claims that the data dump contains PII (Personally Identifiable Information) and card data of 10 Crore users. CloudSEK has done a detailed analysis of this incident and the key findings are summarized below.

Overview

• Juspay had a security breach in August 2020 when a group of hackers hacked into their Payment MetaData servers and downloaded a few databases. 
• Juspay did not disclose this incident to authorities – rather concealed the breach. 
• In January 2021, Inc42 reported that Juspay was beached and its customers’ PII information was leaked on the dark web. 
• The databases contain 16 fields including masked card data and PII (email address, first and last name, mobile numbers), among other sensitive information. 

Impact

• The leaked data does not contain full card data – it mainly exposes users’ PII along with masked card data.
• There is no direct impact on other banks as the card numbers are masked, i.e. only the first 4 and last 4 numbers are visible.
• It is impossible to reverse engineer or brute force card numbers because card issuers (Visa, MasterCard, Rupay) block an invalid card after 100 failed attempts. 
• The PII can be used to carry out social engineering attacks on the affected users.
• The direct impact of this leak is negligible for banks and other organizations as full card data was not compromised and the chances of retrieving full data from partial data is impossible. 

Advice to Security Teams

• We will see increased targeted phishing attacks on card users in the coming months. 
• In case of a successful phishing attack – banks are advised to keep a close watch on credit cards that have been through JusPay gateway using internal fraud monitoring technologies. 

Detailed Technical Analysis

CloudSEK’s flagship digital risk monitoring platform XVigil discovered a post on a data sharing platform, selling user databases of multiple companies. Our Threat Intelligence researchers did a detailed analysis on the same. The companies affected are:

Impacted Assets

The most recent post contains a sample of the Juspay database though the data has not been validated. Here are some sample screenshots from the leak:

Schema 1

The “stored_card” database contains the following fields:

•   id varchar
•   version bigint
•   card_brand
•   card_exp_month
•   card_exp_year
•   card_fingerprint
•   card_isin
•   card_issuer
•   card_last_four_digits
•   card_reference
•   card_token
•   card_token_of_vault_provider
•   card_type
•   customer_id
•   date_created
•   last_updated
•   masked_card_number
•   merchant_account_id
•   name_on_card
•   nickname
•   vault_provider
•   card_global_fingerprint

Schema 2

The “customer” database contains the following fields:

•   id
•   version
•   date_created
•   email_address
•   first_name
•   last_name
•   last_updated
•   merchant_account_id
•   mobile_country_code
•   mobile_number
•   object_reference_id

Threat Actor

The threat actor joined the forum in December 2020. And since then, the threat actor has shared 2 posts, attempting to sell databases from their private collection. 

One of the posts advertises multiple databases while the other post is selling the Gympass database.