FD poly-mal-scan

FWold 多语言(PHP/JS/Bash)恶意代码/webshell 扫描检测器: 用法、MCP 接入、规则库持续更新、运行依赖。扫描文件/代码、挂载/测试 detect_mcp_server MCP、新增调准特征码规则、排查误报漏报时启用。

Not recommendedlow grade F

ClawHub Agent Skills author: tsherryyann v0.0.2 MIT-0 53 files body ≈ 1 757 tokens Open the sourceclawhub.ai↗ analyzed 3 d ago

FWold 多语言(PHP/JS/Bash)恶意代码/webshell 扫描检测器: 用法、MCP 接入、规则库持续更新、运行依赖。扫描文件/代码、挂载/测试 detectmcpserver MCP、新增调准特征码规则、排查误报漏报时启用。

As a process D 46/100 · Unfinished process — weak spots: result and completion, when it triggers, inputs and preconditions

Analyzer GitHub AI and agents Infrastructuretype and topics are labelled automatically from the skill text

Runs in: OpenClaw Claude / Claude Code ChatGPT / Codex Gemini CLI Cursor GitHub Copilot / VS Code Qwen Code Kimi Code CLI Z.ai (GLM) DeepSeek (Deep Code) Mistral Vibe LangChain (deepagents) Goose OpenCode

JSON

Technical rating

29/100

safety, quality, tests

Safety 60%: 0
Quality 40%: 72
Run on models: none yet

Process rating

46/100

Unfinished process

Result and completion w 14: 0
Inputs and preconditions w 11: 0
Failures and branches w 10: 0

the three weakest of ten parameters · all ten

What is at stake

Medium-severity findings: the skill is probably honest, but read what alarmed the scanner.

Dangerous commands medium severity

Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.

If you install

The skill contains commands that delete files, rewrite disks or execute code fetched from the network. The agent may run them without asking if it believes the instructions require it.

For the author

Replace destructive commands with safe equivalents that ask for confirmation, scope them to one folder, and stop piping curl into a shell: pin a version and a checksum.

Exfiltration medium severity

Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.

If you install

The instructions or scripts send data out: environment variables, keys, file contents, chat history. You may never notice, because the agent performs the upload as "part of the task".

For the author

If the upload is not needed for the task, remove it: catalogs flag such skills and delist them. If it is needed, name the destination explicitly, say what leaves the machine, and give the user a switch.

How to improve

Say in the description WHEN to use the skill ("use when…", example requests): that is the agent's main cue.

For the model run — optional

Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.

Guard findings · 64

✓ No critical or high findings

Medium and low: 64

medium Dangerous commands cmd-encoded-exec bash_security/bash_ast_normalize.py:11

Executes a base64/encoded payload (string literal in code, not executed; documentation of a security skill)
```
4. 管道解码执行:  base64 -d x | bash / printf '\\x..'          —— 解码后直接执行,绕过字符串匹配
```
code literalsecurity skill
medium Dangerous commands cmd-destructive-fs bash_security/bash_ast_normalize.py:14

Destructive filesystem command (wipes root/home/drive) (string literal in code, not executed; documentation of a security skill)
```
7. 持久化/破坏:   crontab / systemctl / rm -rf / iptables -F
```
code literalsecurity skill
medium Dangerous commands cmd-encoded-exec bash_security/bash_categories.json:26

Executes a base64/encoded payload (string literal in code, not executed; documentation of a security skill)
```
"base64 -d | bash",
```
code literalsecurity skill
medium Dangerous commands cmd-encoded-exec bash_security/bash_file_write.json:108

Executes a base64/encoded payload (string literal in code, not executed; documentation of a security skill)
```
"危险内容特征": ["chmod u+s", "useradd -u 0", "iptables -F", "/dev/tcp/", "base64 -d | bash", "LD_PRELOAD"],
```
code literalsecurity skill
medium Dangerous commands cmd-destructive-fs bash_security/bash_malicious_commands.json:197

Destructive filesystem command (wipes root/home/drive) (string literal in code, not executed; documentation of a security skill)
```
"危险参数": [":|:&", ":(){ :|:& };:"],
```
code literalsecurity skill
medium Dangerous commands cmd-encoded-exec bash_security/bash_raw_traits.json:32

Executes a base64/encoded payload (string literal in code, not executed; documentation of a security skill)
```
"base64 -d | bash",
```
code literalsecurity skill
medium Dangerous commands cmd-destructive-fs bash_security/bash_raw_traits.json:40

Destructive filesystem command (wipes root/home/drive) (string literal in code, not executed; documentation of a security skill)
```
":(){ :|:& };:",
```
code literalsecurity skill
medium Dangerous commands cmd-encoded-exec bash_security/bash_raw_traits.json:117

Executes a base64/encoded payload (string literal in code, not executed; documentation of a security skill)
```
"base64 -d | bash",
```
code literalsecurity skill
medium Dangerous commands cmd-encoded-exec bash_security/bash_raw_traits.json:118

Executes a base64/encoded payload (string literal in code, not executed; documentation of a security skill)
```
"base64 -d | sh",
```
code literalsecurity skill
medium Exfiltration exfil-post-credential-file bash_security/特征码来源.md:98

Uploads a credential/secret file to a remote endpoint (documentation table row; documentation of a security skill)
```
| 网络外带/SSRF | plain | `curl -X POST -d @/etc/shadow` | 外带 shadow 文件 | 常见 exfil 样本 |
```
tablesecurity skill
medium Exfiltration exfil-post-credential-file bash_security/特征码来源.md:129

Uploads a credential/secret file to a remote endpoint (documentation table row; documentation of a security skill)
```
| `53.sh`–`60.sh` | 代码解密/混淆还原 + 网络外带 | `base64 -d | bash` / `rev |` / `curl -X POST -d @/etc/shadow` |
```
tablesecurity skill
medium Dangerous commands cmd-encoded-exec bash_security/特征码来源.md:129

Executes a base64/encoded payload (documentation table row; documentation of a security skill)
```
| `53.sh`–`60.sh` | 代码解密/混淆还原 + 网络外带 | `base64 -d | bash` / `rev |` / `curl -X POST -d @/etc/shadow` |
```
tablesecurity skill
medium Dangerous commands cmd-encoded-exec js_security/特征码来源.md:63

Executes a base64/encoded payload (documentation table row; documentation of a security skill)
```
| 代码/命令执行 | plain | `eval(atob(` | base64 解码后 eval（混淆执行） |
```
tablesecurity skill
low Dangerous commands cmd-disable-security bash_security/bash_ast_normalize.py:14

Disables a security control (Defender, Gatekeeper, SIP, firewall, execution policy) (string literal in code, not executed; documentation of a security skill)
```
7. 持久化/破坏:   crontab / systemctl / rm -rf / iptables -F
```
code literalsecurity skill
low Dangerous commands cmd-disable-security bash_security/bash_categories.json:20

Disables a security control (Defender, Gatekeeper, SIP, firewall, execution policy) (string literal in code, not executed; documentation of a security skill)
```
"iptables -F",
```
code literalsecurity skill
low Dangerous commands cmd-destructive-fs-scoped bash_security/bash_categories.json:22

Destructive command on a partition / current directory (normal in admin docs; verify the target) (string literal in code, not executed; documentation of a security skill)
```
"dd if=/dev/urandom of=/dev/sda",
```
code literalsecurity skill
low Dangerous commands cmd-pipe-to-shell bash_security/bash_categories.json:27

Downloads and executes remote code from an unrecognised host (pipe to shell) (string literal in code, not executed; documentation of a security skill)
```
"curl | bash",
```
code literalsecurity skill
low Dangerous commands cmd-pipe-to-shell bash_security/bash_categories.json:28

Downloads and executes remote code from an unrecognised host (pipe to shell) (string literal in code, not executed; documentation of a security skill)
```
"wget | sh",
```
code literalsecurity skill
low Dangerous commands cmd-persistence bash_security/bash_categories.json:49

Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed; documentation of a security skill)
```
"/etc/crontab",
```
code literalsecurity skill
low Dangerous commands cmd-shell-rc bash_security/bash_categories.json:94

Writes to a shell startup file (string literal in code, not executed; documentation of a security skill)
```
">> ~/.bashrc",
```
code literalsecurity skill
low Dangerous commands cmd-cron-mention bash_security/bash_categories.json:95

Mentions editing / listing crontab (string literal in code, not executed; documentation of a security skill)
```
"crontab -e",
```
code literalsecurity skill
low Dangerous commands cmd-background-process bash_security/bash_categories.json:96

Starts a background / autostarted process (string literal in code, not executed; documentation of a security skill)
```
"systemctl enable",
```
code literalsecurity skill
low Dangerous commands cmd-persistence bash_security/bash_categories.json:98

Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed; documentation of a security skill)
```
"@reboot"
```
code literalsecurity skill
low Dangerous commands cmd-persistence bash_security/bash_file_write.json:26

Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed; documentation of a security skill)
```
"目标路径特征": ["/etc/crontab", "/etc/cron.", "/var/spool/cron", "/etc/cron.d/", "crontab -e", "/var/spool/cron/crontabs"],
```
code literalsecurity skill
low Dangerous commands cmd-cron-mention bash_security/bash_file_write.json:26

Mentions editing / listing crontab (string literal in code, not executed; documentation of a security skill)
```
"目标路径特征": ["/etc/crontab", "/etc/cron.", "/var/spool/cron", "/etc/cron.d/", "crontab -e", "/var/spool/cron/crontabs"],
```
code literalsecurity skill
low Dangerous commands cmd-disable-security bash_security/bash_file_write.json:108

Disables a security control (Defender, Gatekeeper, SIP, firewall, execution policy) (string literal in code, not executed; documentation of a security skill)
```
"危险内容特征": ["chmod u+s", "useradd -u 0", "iptables -F", "/dev/tcp/", "base64 -d | bash", "LD_PRELOAD"],
```
code literalsecurity skill
low Dangerous commands cmd-pipe-to-shell bash_security/bash_malicious_commands.json:124

Downloads and executes remote code from an unrecognised host (pipe to shell) (string literal in code, not executed; documentation of a security skill)
```
"名称": "网络下载后直接执行(curl|sh)",
```
code literalsecurity skill
low Dangerous commands cmd-pipe-to-shell bash_security/bash_malicious_commands.json:127

Downloads and executes remote code from an unrecognised host (pipe to shell) (string literal in code, not executed; documentation of a security skill)
```
"危险参数": ["| bash", "| sh", "|/bin/bash", "| /bin/sh", "curl -s | sh", "curl -s | bash"],
```
code literalsecurity skill
low Dangerous commands cmd-pipe-to-shell bash_security/bash_malicious_commands.json:134

Downloads and executes remote code from an unrecognised host (pipe to shell) (string literal in code, not executed; documentation of a security skill)
```
"名称": "网络下载后直接执行(wget|sh)",
```
code literalsecurity skill
low Dangerous commands cmd-disable-security bash_security/bash_raw_traits.json:26

Disables a security control (Defender, Gatekeeper, SIP, firewall, execution policy) (string literal in code, not executed; documentation of a security skill)
```
"iptables -F",
```
code literalsecurity skill
low Dangerous commands cmd-destructive-fs-scoped bash_security/bash_raw_traits.json:28

Destructive command on a partition / current directory (normal in admin docs; verify the target) (string literal in code, not executed; documentation of a security skill)
```
"dd if=/dev/urandom of=/dev/sda",
```
code literalsecurity skill
low Dangerous commands cmd-destructive-fs-scoped bash_security/bash_raw_traits.json:29

Destructive command on a partition / current directory (normal in admin docs; verify the target) (string literal in code, not executed; documentation of a security skill)
```
"mkfs.ext4 /dev/",
```
code literalsecurity skill
low Dangerous commands cmd-pipe-to-shell bash_security/bash_raw_traits.json:33

Downloads and executes remote code from an unrecognised host (pipe to shell) (string literal in code, not executed; documentation of a security skill)
```
"curl | bash",
```
code literalsecurity skill
low Dangerous commands cmd-pipe-to-shell bash_security/bash_raw_traits.json:34

Downloads and executes remote code from an unrecognised host (pipe to shell) (string literal in code, not executed; documentation of a security skill)
```
"wget | sh",
```
code literalsecurity skill
low Dangerous commands cmd-persistence bash_security/bash_raw_traits.json:72

Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed; documentation of a security skill)
```
">> /etc/crontab",
```
code literalsecurity skill
low Dangerous commands cmd-persistence bash_security/bash_raw_traits.json:73

Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed; documentation of a security skill)
```
"/etc/cron.d/",
```
code literalsecurity skill
low Dangerous commands cmd-shell-rc bash_security/bash_raw_traits.json:74

Writes to a shell startup file (string literal in code, not executed; documentation of a security skill)
```
">> ~/.bashrc",
```
code literalsecurity skill
low Dangerous commands cmd-shell-rc bash_security/bash_raw_traits.json:147

Writes to a shell startup file (string literal in code, not executed; documentation of a security skill)
```
">> ~/.bashrc",
```
code literalsecurity skill
low Dangerous commands cmd-persistence bash_security/bash_raw_traits.json:148

Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed; documentation of a security skill)
```
">> /etc/crontab",
```
code literalsecurity skill
low Dangerous commands cmd-cron-mention bash_security/bash_raw_traits.json:149

Mentions editing / listing crontab (string literal in code, not executed; documentation of a security skill)
```
"crontab -e",
```
code literalsecurity skill
low Dangerous commands cmd-background-process bash_security/bash_raw_traits.json:150

Starts a background / autostarted process (string literal in code, not executed; documentation of a security skill)
```
"systemctl enable malicious",
```
code literalsecurity skill
low Dangerous commands cmd-persistence bash_security/bash_raw_traits.json:152

Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed; documentation of a security skill)
```
"@reboot",
```
code literalsecurity skill
low Dangerous commands cmd-persistence bash_security/特征码来源.md:99

Persistence mechanism (cron / launchd / scheduled task / autorun registry) (documentation table row; documentation of a security skill)
```
| 权限维持/常驻 | plain | `@reboot` / `>> /etc/profile.d/` | 定时/全局持久化 | ATT&CK T1053/T1037 |
```
tablesecurity skill
low Exfiltration exfil-read-secret-files bash_security/特征码来源.md:129

Reads credential / secret files (documentation table row; documentation of a security skill)
```
| `53.sh`–`60.sh` | 代码解密/混淆还原 + 网络外带 | `base64 -d | bash` / `rev |` / `curl -X POST -d @/etc/shadow` |
```
tablesecurity skill
low Risky intent intent-offensive-security js_security/特征码来源.md:29

Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
```
- **说明**：`nodejs/shell.js` 是典型的 Node.js 反弹 shell（reverse shell）样本：
```
low Dangerous commands cmd-eval-dynamic js_security/特征码来源.md:63

Dynamic code execution from decoded/untrusted input (documentation table row; documentation of a security skill)
```
| 代码/命令执行 | plain | `eval(atob(` | base64 解码后 eval（混淆执行） |
```
tablesecurity skill

A further 18 matches are quotations in this security skill's documentation and are not counted as findings.

Files scanned: 53. Evidence is masked. Grey chips explain why severity was lowered.

Against the Agent Skills spec

warning description-no-when description does not say WHEN to use the skill (no "use when")

Process rating: all ten parameters 46/100

0Result and completion. Does not say what the result is
0Inputs and preconditions. Does not say what the process needs to start
0Failures and branches. Linear process with no failure handling
0Progress reporting. Says nothing while it works
20When it triggers. No condition that starts the skill
60Tools and files. Uses tools (bash, web, python) that frontmatter does not declare
100Steps. 27 steps
100Consistency. Name and required fields are in place
100Execution cost. Instruction body is 1757 tokens
100Running it twice. No mutating operations

Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.

Quality signals

+5Description has no quoted example phrases that should trigger the skill
+4Description does not say when NOT to use the skill (false activations)
+3Output format is not stated: the model decides each time
+1No license
+2Single-language instructions
+3Description length 122: enough signal without eating the budget
+4Structure: 11 headings
+3Step-by-step instructions: 27 items
+4Has examples (4 code blocks)

Quality base 70; lint remarks subtract, signals add up to 100. Result: 72.

External checks

ClawHub: clean

This is a disclosed PHP/JS/Bash malware-scanning skill; the scary strings are detector signatures and examples, not payloads the skill runs.

LLM: benign (high) · VirusTotal: · 3 Sept 2026

Tests

— no evals.json

— no spec.yaml

— not run on models

Files · 53

SKILL.md 12K
bash_security/bash_ast_normalize.py 16K
bash_security/bash_ast_tree.py 2K
bash_security/bash_categories.json 2K
bash_security/bash_cmd_dect.py 2K
bash_security/bash_common.py 1K
bash_security/bash_detect_rules.py 10K
bash_security/bash_file_write.json 5K
bash_security/bash_file_write_dect.py 2K
bash_security/bash_malicious_commands.json 7K
bash_security/bash_malicious_variables.json 4K
bash_security/bash_raw_traits.json 3K
bash_security/bash_self_replicate.json 2K
bash_security/bash_self_replicate_dect.py 2K
bash_security/bash_threat_func_dect.py 2K
bash_security/bash_threatening_funcs.json 2K
bash_security/bash_trait_dect.py 2K
bash_security/bash_var_dect.py 2K
bash_security/bashdect.py 6K
bash_security/特征码来源.md 17K
code_language_recognition.py 1K
detect_mcp_server.py 16K
js_security/js_ast_normalize.py 11K
js_security/js_ast_tree.py 2K
js_security/js_categories.json 3K
js_security/js_common.py 10K
js_security/js_detect_rules.py 7K
js_security/js_dynamic_code_dect.py 2K
js_security/js_file_write_dect.py 6K
js_security/js_logic_engine.py 5K
js_security/js_raw_traits.json 1K
js_security/js_threat_func_dect.py 6K
js_security/js_threatening_funcs.json 3K
js_security/js_trait_dect.py 2K
js_security/jscontent_get.py 0K
js_security/jsdect.py 9K
js_security/特征码来源.md 11K
php_security/categories.json 3K
php_security/detect_rules.py 6K
php_security/dynamic_var_dect.py 3K
php_security/file_write_dect.py 9K
php_security/filecontent_get.py 1K
php_security/logic_engine.py 5K
php_security/php_ast_normalize.py 15K
php_security/php_ast_tree.py 2K
php_security/php_common.py 6K
php_security/phpdect.py 10K
php_security/raw_traits.json 1K
php_security/threat_func_dect.py 4K
php_security/threatening_funcs.json 3K
php_security/trait_dect.py 2K
php_security/特征码来源.md 11K
skill-card.md 2K

Dates

In catalog since 2 Sept 2026

Updated in catalog 3 Sept 2026

First seen here 7 Sept 2026

Last analysis 11 Sept 2026, 13:32 UTC

Last seen in crawl 16 h ago

Score history

Date		Score	Safety	Qual.
7 Sept 2026	F	29	0	72