Malicious code in haproxy-config-client (PyPI)

Overview

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Source: kam193 (f70d07844bca4fadfcedb195f5768c8a95318af4d62a4bcec94556b99b72c4ad)

During installation the obfuscated code downloads a malicious executable from a remote location. Code is designed to survive different blocks: first, there is an attempt to download the executable from one of five Cloudflare Workers. If it's not successful, the code falls back to download using DNS: first, it gets a TXT record from c.lin.dl.wel1[.]ru. This record returns a number, which is then used to iterate over domains in the form <0...n>.lin.dl.wel1[.]r and reconstruct the encoded executable from their TXT records. The executable is finally saved under a partially random name, executed, and removed after execution. The Linux executable contacts a few domains, but there is no more detailed information about its behavior available.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-07-haproxy-config-client

Reasons (based on the campaign):

• The package overrides the install command in setup.py to execute malicious code during installation.

• Downloads and executes a remote executable.

• obfuscation

• dependency-confusion

• other

• malware

• covering-tracks

• targetted-attack

• data-stored-in-dns

Affected packages

• haproxy-config-client

Remediation

Refer to the advisory for the patched release.