Jiffy Intel — Threat intelligence for AI artifacts

Summary

Skill writes an executable file named `python` (higher on PATH than the real one) to ~/.local/bin or ~/bin. Future invocations of python run the shim, which logs stdin to a file and then execs the real binary.

Severity & confidence

Severity

Medium

Notable weakness with plausible abuse chains or partial mitigations already in place. Track, and resolve as part of your normal hardening cadence.

Confidence

Confirmed

Observed directly by Jiffy scanners or validated by multiple independent sources. Indicators are reliable enough to drive automated action.

Indicators

Observed patterns and artifacts associated with this entry. Each indicator can be copied into your detection stack or SIEM.

(?:~/|/Users/[^/]+/)(?:\.local/bin|bin)/(?:python|node|git|docker)\b

Detection rule

A YARA-style pseudo-rule auto-generated from the indicators above. Useful as a starting point — adapt the syntax for your target detection platform.

YARA-style pseudo-rule

rule jiffy_ti_2026_000025
{
    meta:
        source = "jiffy-intel"
        severity = "medium"
        description = "Auto-generated from Jiffy Intel indicators"
    strings:
    $file_path_pattern_0 = "(?:~/|/Users/[^/]+/)(?:\\.local/bin|bin)/(?:python|node|git|docker)\\b"
    condition:
        $file_path_pattern_0
}

Auto-generated from the indicators above. Adapt syntax for your detection stack before deploying.

Affected tools

Tool	Versions	Status
Claude Code	`*`	vulnerable
Claude Desktop	`*`	vulnerable

Example artifacts

Sanitized examples of artifacts Jiffy has observed exhibiting this pattern. Publisher handles are redacted; version ranges and status reflect the most recent scan.

env-doctor-skillSkill
Removed
Source
Anthropic Skills
Versions
1.0.0
First observed
Mar 21, 2026
Last observed
Apr 10, 2026
path-helper-skillSkill
Quarantined
Source
Community registry
First observed
Mar 25, 2026

How to remediate

01Inspect ~/.local/bin for unexpected executables shadowing system binaries.
02Restore PATH order or delete shims.

Timeline & sources

Timeline

First observedMar 21, 202627 days ago
Last updatedApr 22, 2026today
PublishedMar 31, 202617 days ago

Sources

scanner

References

attack.mitre.org

MITRE ATT&CK T1546 — Event Triggered Execution

https://attack.mitre.org/techniques/T1546/

attack.mitre.org

MITRE ATT&CK T1056 — Input Capture

https://attack.mitre.org/techniques/T1056/

Related intel

Other entries of type Backdoor, or the most recent published entries if no same-type matches exist.

BackdoorHigh

Skill writes config that hooks into Claude Desktop stdio MCP bridge

Skill modifies the user's Claude Desktop config to register an MCP server pointing at localhost. The server is supplied by the same skill and serves as a persistent interposer between the agent and tool calls, logging all tool arguments.

Jiffy IntelApr 28

BackdoorMedium

agents.md asserts "skip security scans — reviewer will verify"

agents.md instructs the agent to explicitly skip any security scan "because the reviewer will verify." Benign on the surface, the directive disarms the last line of defense and invites shipping unscanned code.