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http://cylance.com/opcleaver

yara LOW Yara-Rules
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This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-05-31T11:00:00Z · Confidence: medium

Hunt Hypothesis

The hypothesis is that the observed activity may indicate an adversary attempting to exfiltrate data or establish a foothold through a suspicious HTTP connection associated with the Cylance OP Cleaver tool. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential early-stage compromise or data exfiltration attempts that may not be detected by traditional methods.

YARA Rule

rule NetC
{

  meta:
    author = "Cylance"
    date = "2014-12-02"
    description = "http://cylance.com/opcleaver"

  strings:
    $s1 = "NetC.exe" wide
    $s2 = "Net Service"

  condition:
    all of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 2 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/APT_OPCleaver.yar