TheHypers protector TheHyper

Hunt Hypothesis

This rule detects the presence of TheHyper, a lightweight process protector often used by adversaries to hide malicious processes and evade standard endpoint visibility tools. Proactively hunting for this indicator in Azure Sentinel allows the SOC to identify compromised hosts that may be employing advanced obfuscation techniques to maintain persistence and resist analysis.

YARA Rule

rule TheHypers_protector_TheHyper: PEiD
{
    strings:
        $a = { 55 8B EC 83 EC 14 8B FC E8 14 00 00 00 ?? ?? 01 01 ?? ?? 01 01 ?? ?? ?? 00 ?? ?? 01 01 ?? ?? 02 01 5E E8 0D 00 00 00 6B 65 72 6E 65 6C 33 32 2E 64 6C 6C 00 8B 46 04 FF 10 8B D8 E8 0D 00 00 00 56 69 72 74 75 61 6C 41 6C 6C 6F 63 00 53 8B 06 FF 10 89 07 E8 }
    condition:
        $a at pe.entry_point

}

Deployment Notes

This YARA rule can be deployed in the following contexts:

• Microsoft Defender for Endpoint — Custom indicators / advanced hunting
• Email Gateway — Attachment scanning
• File Share Monitoring — Periodic scanning of shared drives
• YARA CLI — Manual threat hunting on endpoints

This rule contains 1 string patterns in its detection logic.

• Source Rule

False Positive Guidance

• Scenario: A developer or DevOps engineer uses TheHyper (a lightweight, open-source process injection tool) during local debugging or testing of a custom service on a build agent or developer workstation. The YARA rule matches the binary signature or specific string patterns within the TheHyper.exe or associated payload files.

  • Filter/Exclusion: Exclude files located in specific development directories (e.g., C:\Users\<user>\dev\, C:\projects\) or exclude processes where the parent process is a known IDE or build tool (e.g., code.exe, msbuild.exe, dotnet.exe) and the file path contains TheHyper.

• Scenario: An automated scheduled task or CI/CD pipeline (e.g., Azure DevOps, Jenkins) executes a custom utility script that bundles or invokes TheHyper for rapid process injection during a deployment verification step on a non-production server. The rule triggers on the execution of the binary or the presence of its characteristic strings in memory.

  • Filter/Exclusion: Exclude executions where the parent process is a known CI/CD agent (e.g., vstsagent.exe, jenkins-agent.jar) or where the command line contains specific deployment keywords (e.g., deploy, verify, inject) and the file path is within the CI/CD workspace directory (e.g., C:\agent\_work\).

• Scenario: A security testing team or red team uses TheHyper as part of a legitimate penetration test or chaos engineering exercise on a designated test environment or isolated VLAN. The YARA rule detects the tool’s unique signature during the test window.

  • Filter/Exclusion: Exclude hosts tagged with Environment=Test or Environment=Staging in your CMDB or asset inventory. Alternatively, create a time-based exclusion