envprovision@1.4.0

Summary

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: amazon-inspector (a414ad5404fdeeb23c37f1580aeee8175765ba8613e8fadd1a0254bf0e25d2f6)