TTPpack additional

Hunt Hypothesis

This hypothesis targets the presence of TTPpack, a known malware family often used for initial access or persistence, by identifying its specific code patterns within Azure Sentinel. Proactively hunting for this signature allows the SOC team to detect low-severity threats that may evade traditional behavioral detections, ensuring early identification of compromised workloads or endpoints before they escalate in impact.

YARA Rule

rule TTPpack_additional: PEiD
{
    strings:
        $a = { E8 00 00 00 00 5D 81 ED F5 8F 40 00 60 33 F6 E8 11 00 00 00 8B 64 24 08 64 8F 05 }
    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 DevOps engineer uses Terraform or Ansible to provision new infrastructure, where the terraform plan or ansible-playbook execution generates temporary state files or logs that match the byte signature of the TTPpack_additional YARA rule.
  • Filter/Exclusion: Exclude files located in standard CI/CD workspace directories (e.g., C:\Jenkins\workspace\, /var/lib/jenkins/workspace/) or files with extensions .tfstate, .tfplan, or .log if the rule targets binary artifacts.
• Scenario: An IT administrator runs Sysinternals Process Monitor or Wireshark to capture diagnostic data, and the resulting capture files (.pcap, .etl) contain embedded metadata or packet payloads that inadvertently match the TTPpack signature.
  • Filter/Exclusion: Exclude files in common diagnostic tool output directories (e.g., C:\Temp\, C:\Users\<Admin>\Desktop\) or specific file extensions like .pcap, .etl, and .cap when the parent process is Wireshark.exe, Process.exe, or logman.exe.
• Scenario: A software development team compiles a custom C++ or Rust application using MSVC or Rustc, and the resulting debug binaries (.pdb files or unoptimized .exe files) contain debug symbols or string literals that trigger the YARA rule.
  • Filter/Exclusion: Exclude files with the .pdb extension or binaries located in build output directories (e.g., bin\Debug\, target\debug\) where the parent process is msbuild.exe, dotnet.exe, or cargo.exe.
• Scenario: A security team runs a VirusTotal or **Clam