How do I install the T1481.002_bidirectional-communication skill?

Run npx skillmds@latest add cyberstrikeus/t1481-002-bidirectional-communication in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is T1481.002_bidirectional-communication safe to use?

SkillMD's automated safety review verdict for this skill is PASS. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with T1481.002_bidirectional-communication?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is T1481.002_bidirectional-communication free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published T1481.002_bidirectional-communication?

cyberstrikeus (@cyberstrikeus) published this skill. Their other Agent Skills are listed on their SkillMD profile.

T1481.002_bidirectional-communication by cyberstrikeus

Name: T1481.002_bidirectional-communication
Author: cyberstrikeus

File contents

T1481.002 Bidirectional Communication

Sub-technique of: T1481

High-Level Description

Adversaries may use an existing, legitimate external Web service channel as a means for sending commands to and receiving output from a compromised system. Compromised systems may leverage popular websites and social media to host command and control (C2) instructions. Those infected systems can then send the output from those commands back over that Web service channel. The return traffic may occur in a variety of ways, depending on the Web service being utilized. For example, the return traffic may take the form of the compromised system posting a comment on a forum, issuing a pull request to development project, updating a document hosted on a Web service, or by sending a Tweet.

Popular websites and social media, acting as a mechanism for C2, may give a significant amount of cover. This is due to the likelihood that hosts within a network are already communicating with them prior to a compromise. Using common services, such as those offered by Google or Twitter, makes it easier for adversaries to hide in expected noise. Web service providers commonly use SSL/TLS encryption, giving adversaries an added level of protection.

Kill Chain Phase

Command and Control (TA0037)

Platforms: Android, iOS

What to Check

Identify if Bidirectional Communication technique is applicable to target mobile environment
Check Android devices for indicators of Bidirectional Communication
Check iOS devices for indicators of Bidirectional Communication
Assess detection coverage (1 detection strategies)

How to Test

Identify Attack Surface

Determine if the target mobile environment is susceptible to Bidirectional Communication by examining the target platforms (Android, iOS).

Assess Existing Defenses

Review whether mitigations for T1481.002 are in place. If defenses are absent or misconfigured, this technique may be exploitable.

Remediation Guide

No specific mitigations documented for this technique.

Detection

Detection of Bidirectional Communication

Risk Assessment

Finding	Severity	Impact
Bidirectional Communication technique applicable	Low	Command And Control

CWE Categories

CWE ID	Title
CWE-300	Channel Accessible by Non-Endpoint

References

MITRE ATT&CK Mobile - T1481.002

---name: t1481-002-bidirectional-communicationdescription: Adversaries may use an existing, legitimate external Web service channel as a means for sending commands to and receiving output from a compromised system.---# T1481.002 Bidirectional Communication> **Sub-technique of:** T1481## High-Level DescriptionAdversaries may use an existing, legitimate external Web service channel as a means for sending commands to and receiving output from a compromised system. Compromised systems may leverage popular websites and social media to host command and control (C2) instructions. Those infected systems can then send the output from those commands back over that Web service channel. The return traffic may occur in a variety of ways, depending on the Web service being utilized. For example, the return traffic may take the form of the compromised system posting a comment on a forum, issuing a pull request to development project, updating a document hosted on a Web service, or by sending a Tweet.Popular websites and social media, acting as a mechanism for C2, may give a significant amount of cover. This is due to the likelihood that hosts within a network are already communicating with them prior to a compromise. Using common services, such as those offered by Google or Twitter, makes it easier for adversaries to hide in expected noise. Web service providers commonly use SSL/TLS encryption, giving adversaries an added level of protection.## Kill Chain Phase- Command and Control (TA0037)**Platforms:** Android, iOS## What to Check- [ ] Identify if Bidirectional Communication technique is applicable to target mobile environment- [ ] Check Android devices for indicators of Bidirectional Communication- [ ] Check iOS devices for indicators of Bidirectional Communication- [ ] Assess detection coverage (1 detection strategies)## How to Test### Identify Attack SurfaceDetermine if the target mobile environment is susceptible to Bidirectional Communication by examining the target platforms (Android, iOS).### Assess Existing DefensesReview whether mitigations for T1481.002 are in place. If defenses are absent or misconfigured, this technique may be exploitable.## Remediation GuideNo specific mitigations documented for this technique.## Detection### Detection of Bidirectional Communication## Risk Assessment| Finding | Severity | Impact || ------------------------------------------------ | -------- | ------------------- || Bidirectional Communication technique applicable | Low | Command And Control |## CWE Categories| CWE ID | Title || ------- | ---------------------------------- || CWE-300 | Channel Accessible by Non-Endpoint |## References- [MITRE ATT&CK Mobile - T1481.002](https://attack.mitre.org/techniques/T1481/002)

Frequently asked questions

T1481.002_bidirectional-communication