The length of the encrypted data is aligned to 16 bytes, as required by the AES CBC cipher. File data is encrypted with AES-256 in CBC mode. There are references to asymmetric cryptography libraries in the sample (RSA and elliptic curves), but the ransomware doesn’t do any of it. Due to the nature of the Go language, there are many strings directly visible in the binary, including details about the directory structure of the author’s PC: Static analysis of BianLian ransomwareīianLian is a ransomware strain written in Go language and compiled as a 64-bit Windows executable. Skip to how to use the BianLian ransomware decryptor. The BianLian ransomware emerged in August 2022, performing targeted attacks in various industries, such as the media and entertainment, manufacturing and healthcare sectors, and raised the threat bar by encrypting files at high speeds. The team at Avast has developed a decryptor for the BianLian ransomware and released it for public download.
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