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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 covert communication channel using a malicious domain associated with the Cylance OP Cleaver tool. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential advanced persistent threats that may evade traditional detection methods.

YARA Rule

rule pvz_in
{

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

  strings:
    $s1 = "LAST_TIME=00/00/0000:00:00PM$"
    $s2 = "if %%ERRORLEVEL%% == 1 GOTO line"

  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