BianLian Ransomware Group's Attack on Bira 91

BianLian ransomware group has attacked Bira 91, exfiltrating 1.9TB of data, including finance data, HR data, recipes, and other trade secrets, data of Indian and international partners, customers, and vendors, mailboxes, internal and external email correspondence with attachments, and SQL databases. Bira 91 was established in 2015 and is driven by a dynamic team of over 600+ passionate beer lovers. It is backed by Sequoia Capital India, Sofina of Belgium, and Kirin Holding of Japan. As one of the fastest-growing brands in India, the company built a diverse portfolio of award-winning beers, one for every occasion.

The Evolution of BianLian

The BianLian data extortion group first emerged in June 2022 as a typical RaaS (Ransomware-as-a-Service) provider with Golang-based ransomware until a decrypter was released. In early 2023, they appear to have abandoned the ransomware payload portion of attacks in favor of less complicated data exfiltration and extortion attacks. This shows how successful the double extortion strategy is for ransomware groups, and we will likely see more groups join the likes of BianLian (and Karakurt before them).

Techniques and Targets

BianLian leverages open-source tooling and command-line scripts to engage in credential harvesting and data exfiltration. BianLian increased attack volumes as they have moved away from deploying ransomware payloads in favor of pure data extortion attacks, making them one of the more prominent groups in Q1-2023, although still lagging far behind leaders. It is unclear how much BianLian typically requests for a ransom amount or if they are keen to negotiate the demand down.

BianLian successfully attacked several high-profile organizations before a free decryption tool was released to help victims recover files encrypted by ransomware. The group abandoned the RaaS model in favor of pure data extortion attacks where data is exfiltrated and ransom demand issued, but no ransomware is deployed. BianLian has been observed deploying a custom Go-based backdoor for remote access. BianLian uses PowerShell and Windows Command Shell to bypass and evade security solutions.

BianLian primarily targets financial institutions, healthcare, manufacturing, education, entertainment, and energy sectors by leveraging compromised Remote Desktop Protocol (RDP) credentials. Almost exclusively a data extortion attack group now, rarely observed deploying ransomware payloads.