ThreatBook captured a batch of samples on the topic of OnlyFans video leakage recently. After analysis by ThreatBook, it was found that:
- Attackers use OnlyFans video leaks as the topic to deliver trojans to users. Using JWT as a configuration file to steal information from Chrome, suspected of stealing user Facebook tokens and showing interest in their information.
- We extracted C2 from the current samples and conducted extension analysis, identifying other assets behind the attacker. We suggest using internal security devices to block them directly. Please refer to the appendix for specific attacker assets.
OnlyFans is a social media platform that allows users to share paid photos, videos, and other content, typically related to adult content. The platform was established in 2016 with the aim of providing creators with a way to earn income while also providing users with a platform to interact with creators. On OnlyFans, users can subscribe to the content of creators they are interested in and pay for it. Creators can earn income through these subscriptions, while also having private chats and interactions with subscribers on the platform.
Recently, ThreatBook captured a batch of samples with the topic of OnlyFans platform video leakage. Attackers used paid content leakage as the lure, packaged images and Trojan programs together, and used pornographic images to lure users into executing Trojan files disguised as videos, suspected of stealing user Facebook tokens.
Attackers attach malicious files to the compressed package and use underscores, spaces, and long numbers to hide the suffix of the malicious file name, and disguise the icon as a video, notepad, and so on.
The sample is compiled by Golang and will first connect to the C2 address" http://22.214.171.124:1337/api/setting" to obtain the configuration file. The attacker utilizes the JWT token. From the decrypted configuration file, it appears that the attacker is interested in Facebook’s token.
After obtaining configuration information, the Chrome.exe process will be shut down and relevant information will be stolen. The stolen information will be returned to the C2 address “http://126.96.36.199/api/version”. The specific return format is:
During the analysis of the samples, it was found that the attacker not only used OnlyFans as the topic to launch attacks but also used other topics such as “WhatsApp installation program” and “GPT installation program” to lure users to download and execute.
In addition, the differences in the delivered trojans are not significant. They all use Golang as the development language to steal Chrome browser information from infected hosts and send the stolen information back to the C2 address. The C2 address also uses “/api/setting” as the configuration distribution path, and “/api/version” as the reception and return path.
Appendix - IOC
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