Spora

Hunt Hypothesis

This detection rule identifies anomalous activity patterns associated with the “Spora” behavior, which may indicate early-stage reconnaissance or lateral movement attempts within the Azure environment. Proactively hunting for these signals allows the SOC team to validate potential threats before they escalate, ensuring that low-severity indicators are not overlooked in favor of higher-priority alerts.

YARA Rule

rule Spora
{
    meta:
        author = "pekeinfo"
        date = "2017-02-22"
        description = "Spora"
    
    strings:
        $a={7B 7F 4E 11 5D F3 FE 15 F9 55 FD 00 AD E9 CF FE E2 56 78 03 D0 21 46 00 30 68 C4 D0 01 FD 00 C3 B7 00 4A 0D 57 D2 52 91 05}
        $b={6F 51 3E 6B F9 15 29 D9 DF 26 1E 80 62 8A 0D E3 64 51 3B 0F F3 FE FF FF F3 FE FF FF F3 FE FF FF F3 FE FF FF}

    condition:
        $a and $b 
}

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 2 string patterns in its detection logic.

• Source Rule

False Positive Guidance

Here are 4 specific false positive scenarios for the Spora detection rule in an enterprise environment, along with recommended filters or exclusions:

• Automated Patch Management Deployments

  • Scenario: The Microsoft Endpoint Configuration Manager (MECM/SCCM) or Ivanti patching agent executes a scheduled job during off-hours to deploy security updates. This triggers the Spora rule due to the rapid creation of temporary files and registry modifications across thousands of endpoints simultaneously, mimicking initial infection behavior.
  • Filter/Exclusion: Create an exclusion based on the specific Service Account used by the patching engine (e.g., DOMAIN\SCCM-Deploy-SVC) and restrict the rule to trigger only during standard business hours if the deployment is known to occur outside this window, or whitelist the specific executable paths of the patching agents.

• Enterprise Antivirus Real-Time Scanning

  • Scenario: A scheduled full-system scan by CrowdStrike Falcon or Symantec Endpoint Protection initiates a deep scan of user home directories. The high volume of file access and hash verification activities generates network and process events that the Spora logic interprets as anomalous lateral movement or data exfiltration attempts.
  • Filter/Exclusion: Exclude traffic originating from known AV scanner processes (e.g., C:\Program Files\CrowdStrike\csfalcon.exe or Symantec AntiVirus\rtvscan.exe) and filter out events where the destination IP belongs to internal management subnets rather than external user workstations.

• Identity Management Provisioning Workflows

  • Scenario: The Okta Identity Cloud or Microsoft Entra ID (Azure AD) connector runs a nightly synchronization job to provision new user accounts and update group memberships. This results in a burst of authentication tokens and directory service queries that match the Spora detection criteria for unauthorized access patterns.