Malicious code in envprovision (PyPI)

Overview

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Source: amazon-inspector (a414ad5404fdeeb23c37f1580aeee8175765ba8613e8fadd1a0254bf0e25d2f6)

envprovision 1.4.0 presents itself as an environment-diagnostics helper but its public check()/sync() API, on Windows, fetches a JSON manifest from a base64-obfuscated URL that decodes to https://env-metadata.up.railway.app/vbv_a8F3kL92xQ/manifest.json, downloads the referenced binary to a temp path, and executes it. TLS verification is disabled on both the manifest fetch and the binary download (ctx.check_hostname=False, ctx.verify_mode=ssl.CERT_NONE), so the payload can also be substituted by any on-path attacker. The dropped binary is invoked with NSIS silent-install flags (/S, /NCRC) built by character-list concatenation and hidden-window creation flags, then a follow-on syshelpear.exe is spawned detached (CREATE_NO_WINDOW|DETACHED_PROCESS) from a user-writable ProgramFiles/LOCALAPPDATA location as a persistence helper. After execution, wevtutil cl Application and wevtutil cl System are invoked to erase Windows event logs. The endpoint obfuscation, TLS-off fetch-and-execute of an opaque binary from a publisher-mismatched Railway subdomain, silent-install flag assembly, detached helper launch, and anti-forensic log clearing are inconsistent with the advertised diagnostics purpose and constitute an installer-side binary dropper with persistence.

Source: kam193 (cf3a48b407852ec03ead22bb8c16c03f252ba5fafa5c86ed1a739427e7d7d869)

Exported functions hide the malicious functionality. On Windows, it downloads and installs a malicious executable, and disguises it as a system utility. After installation, the code attempts to cover its tracks by cleaning logs and removing downloaded files. The installed executable is a heavily obfuscated malware with multiple sandbox evasion techniques, finally running an infostealer identifying itself as "Snow Stealer". It collects at least browser data and modifies cryptowallet applications.

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

Campaign: 2026-08-envprovision

Reasons (based on the campaign):

• Downloads and executes a remote executable.

• action-hidden-in-lib-usage

• covering-tracks

• persistence

• The package contains code to detect if it is running in a sandbox environment.

• obfuscation

• malware

• infostealer

• exfiltration-browser-data

• exfiltration-crypto

Affected packages

• envprovision

Remediation

Refer to the advisory for the patched release.