Shifenzheng.bak

to automate the encryption of sensitive files.

At first glance, the name raises immediate red flags. "Shifenzheng" (身份证) is the Chinese pinyin for "Identity Card" – specifically, the national ID card mandatory for every Chinese citizen over the age of 16. The .bak extension signifies a backup. When combined, this file appears to be a backup of ID card information. But what is it actually? A malicious artifact? A software remnant? A forensic goldmine?

When working with shifenzheng.bak , users may encounter several issues, particularly with file corruption or version incompatibility. shifenzheng.bak

The term "shifenzheng" is a common pinyin misspelling or variation of (身份证), which means "Identity Card" in Chinese. When you see a file named shifenzheng.bak , it typically contains:

This article dives deep into the technical origins, security implications, forensic significance, and legitimate (and illegitimate) uses of shifenzheng.bak . to automate the encryption of sensitive files

To understand this file, it helps to break down its components: its name and its file extension.

To understand the threat, we must first understand the anatomy of the file name: A malicious artifact

Contrary to urban legend, this file does not spontaneously generate. It is almost always the artifact of three specific scenarios:

In the vast ecosystem of system files, database dumps, and configuration backups, most file extensions are relatively straightforward— .docx for documents, .exe for executables, .log for text records. However, cybersecurity professionals and system administrators working with Chinese software environments have occasionally stumbled upon a peculiar and often alarming file: .

Under China’s effective June 2021, storing unencrypted ID card numbers in a .bak file constitutes a significant compliance failure. Article 51 mandates strict technical measures to prevent leaks. A single shifenzheng.bak file discovered on a compromised server can lead to fines up to ¥50 million RMB (or 5% of previous year’s revenue) for the responsible entity.

The leak was attributed to a vulnerability in a system developed by Zhejiang Huida Yizhan Network Technology Co.