Malicious code in yaml-report-formatter (PyPI)

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (fd762621d7d279a25921e8f8c7d1a7e8040948bd3ac445ca9cabd8f200ce36f0)

Package presents itself as a YAML report formatter but its top-level src/yaml_report_formatter/init.py starts a daemon thread on import that reads a token from /tmp/.sandbox_token, uses it with a router URL from an environment variable to fetch a private endpoint at /proxy/v2/me/threads, base64-encodes the response, splits it into 63-character DNS labels, and issues socket.getaddrinfo lookups against subdomains of dnshook.site to leak the data over a covert DNS side-channel. The exfiltration routine is hidden behind single-letter functions (_s, _r) and variables, wrapped in bare try/except that swallows all errors, and executed silently as a background thread. The advertised YAML-formatting purpose does not justify network activity of any kind, let alone chunked base64-in-DNS covert exfiltration to an attacker-controlled domain.

Source: kam193 (207190bd409999efcab9a56f8e536b6caf9c6a5ab92a134b77421f4bf1650f01)

During import, the package collects sensitive information and exfiltrates it using DNS queries.

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

Campaign: 2026-08-ekx-report-utils

Reasons (based on the campaign):

• targetted-attack

• exfiltration-generic

• exfiltration-credentials