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@sigmashake/ssg@1.1.8: Malicious npm security report (Block) | LPM Firewall

registry / @sigmashake/ssg / 1.1.8

@sigmashake/ssg@1.1.8

AI Agent Governance CLI — evaluate tool calls against rules, block dangerous operations, and surface blocked commands

AI Security Review

scanned 24d ago · by lpm-firewall-ai

A global npm install automatically deletes user-level ssg executables and registers a persistent tracking canary. It transmits a machine-derived fingerprint without an interactive consent step.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review

Trigger

Installing the package globally through npm.

Impact

Removes other installed binaries, exposes a stable device identifier to a remote service, and writes a tracking token under the user's home directory.

Mechanism

Postinstall deletion, device fingerprinting, remote registration, and canary persistence.

Attack narrative

During a global npm installation, postinstall invokes cleanup-globals.cjs. The script removes named executables in user-controlled global locations when they do not resolve inside this package. It then derives a stable fingerprint from machine identifiers and local host data, posts it to api.sigmashake.com, and stores a returned canary token in ~/.sigmashake/.canary. These actions occur automatically rather than through an explicit user command.

AI rationale

The automatic install hook deletes external user binaries and performs persistent machine tracking with remote transmission. This is concrete destructive behavior and data exfiltration unrelated to safely installing the package.

Evidence

package.jsonbin/cleanup-globals.cjs~/.local/bin/ssg~/.local/bin/libssg_eval.so~/.bun/bin/ssg~/.sigmashake/.canary/etc/machine-idHKLM\SOFTWARE\Microsoft\Cryptography

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node ./bin/cleanup-globals.cjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

bin/cleanup-globals.cjsView file

•matchType = normalized_sha256 matchedPackage = @sigmashake/ssg@1.1.5 matchedPath = bin/cleanup-globals.cjs matchedIdentity = npm:QHNpZ21hc2hha2Uvc3Nn:1.1.5 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

bin/cleanup-globals.cjsView on unpkg

5L6: const fs = require("node:fs"); L7: const path = require("node:path");

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/cleanup-globals.cjsView on unpkg · L5

bin/ssg.cjsView file

6L7: const { execFileSync, spawnSync } = require("node:child_process"); L8: const path = require("node:path"); ... L10: L11: const ext = process.platform === "win32" ? ".exe" : ""; L12: const platformPkg = `@sigmashake/ssg-${process.platform}-${process.arch}`; ... L24: // install. L25: // b) default (walks UP from __dirname) — the nested copy at L26: // @sigmashake/ssg/node_modules/@sigmashake/ssg-<plat>-<arch>, which npm ... L44: try { L45: return JSON.parse(fs.readFileSync(pkgJsonPath, "utf8")).version; L46: } catch {

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

bin/ssg.cjsView on unpkg · L6

•matchType = normalized_sha256 matchedPackage = @sigmashake/ssg@1.1.5 matchedPath = bin/ssg.cjs matchedIdentity = npm:QHNpZ21hc2hha2Uvc3Nn:1.1.5 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

bin/ssg.cjsView on unpkg

Source & flagged code

6 flagged

package.jsonView file

Lines 5-45json

5 "license": "SEE LICENSE IN LICENSE",

6 "type": "module",

7 "bin": {

8 "ssg": "bin/ssg.cjs"

9 },

10 "files": [

11 "bin/",

12 "public/",

13 "LICENSE",

14 "README.md",

15 "sbom.cdx.json"

16 ],

17 "optionalDependencies": {

18 "@sigmashake/ssg-linux-x64": "1.1.8",

19 "@sigmashake/ssg-linux-arm64": "1.1.8",

20 "@sigmashake/ssg-darwin-arm64": "1.1.8",

21 "@sigmashake/ssg-darwin-x64": "1.1.8",

22 "@sigmashake/ssg-win32-x64": "1.1.8"

23 },

24 "scripts": {

25 "postinstall": "node ./bin/cleanup-globals.cjs",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L25

26 "gen:api-deprecation": "bun run tools/gen-api-deprecation-catalog.ts",

27 "gen:starter-presets": "bun run tools/gen-starter-presets.ts",

28 "gen:opencode-plugin": "bun run tools/gen-opencode-plugin.ts",

29 "dev": "bun run scripts/dev.ts",

30 "dev:server-only": "SSQA_ATTACH=${SSQA_ATTACH:-1} bun --watch src/serve-dev.ts",

31 "dev:debug": "bun --inspect src/serve-dev.ts",

32 "dev:debug-daemon": "bun --inspect src/cli.ts daemon",

33 "build": "bun run build:client && bun build --compile src/cli.ts --outfile ssg",

34 "build:linux": "bun build --compile --target=bun-linux-x64 src/cli.ts --outfile dist/ssg-linux-x64 && bun run scripts/stage-public-to-dist.ts",

35 "build:macos-arm64": "bun build --compile --target=bun-darwin-arm64 src/cli.ts --outfile dist/ssg-darwin-arm64 && bun run scripts/stage-public-to-dist.ts",

36 "build:macos-x64": "bun build --compile --target=bun-darwin-x64 src/cli.ts --outfile dist/ssg-darwin-x64 && bun run scripts/stage-public-to-dist.ts",

37 "build:macos-universal": "bun run build:macos-arm64 && bun run build:macos-x64 && lipo -create dist/ssg-darwin-arm64 dist/ssg-darwin-x64 -output dist/ssg-darwin-universal && file dist/ssg-darwin-universal",

38 "build:windows": "bun build --compile --target=bun-windows-x64 src/cli.ts --outfile dist/ssg-win32-x64.exe && bun run scripts/stage-public-to-dist.ts",

39 "build:windows-hookw": "bun build --compile --windows-hide-console --target=bun-windows-x64 src/cli.ts --outfile dist/ssg-hookw-win32-x64.exe && bun run scripts/patch-pe-subsystem.ts dist/ssg-hookw-win32-x64.exe && bun run scripts/assert-windowshide-effective.ts && bun run scripts/stage-public-to-dist.ts",

40 "build:linux-arm64": "bun build --compile --target=bun-linux-arm64 src/cli.ts --outfile dist/ssg-linux-arm64 && bun run scripts/stage-public-to-dist.ts",

41 "build:all": "bun run build:linux && bun run build:linux-arm64 && bun run build:macos-arm64 && bun run build:macos-x64 && bun run build:windows && bun run build:windows-hookw",

42 "build:protected:all": "bash ../sigmashake-dist/scripts/build-protected.sh",

43 "pub:platforms": "bash ../sigmashake-dist/scripts/publish-platforms.sh",

44 "prepublishOnly": "bash ../sigmashake-dist/scripts/prepublish-guard.sh",

45 "build:client": "tsc --noEmit -p tsconfig.client.json && vite build",

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.jsonView on unpkg

bin/cleanup-globals.cjsView file

Lines 1-25javascript

1#!/usr/bin/env node

2// bin/cleanup-globals.cjs — Cleans up conflicting global ssg installations

3// Also registers a per-install canary for distribution tracking.

4// This runs on `postinstall` to ensure npm takes precedence

5

6const fs = require("node:fs");

7const path

bin/ssg.cjsView file

Lines 1-26javascript

1#!/usr/bin/env node

2// bin/ssg.cjs — launcher for @sigmashake/ssg

3// Resolves the native binary from the platform-specific optional dependency,

4// falls back to a local dist/ build (dev environment), then to Bun + source.

5"use strict";

6

7const { execFileSync, spawnSync } = require("node:child_process");