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Parviz developer known from Operation Cleaver

yara HIGH Yara-Rules
backdoorcommunity
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: 2026-05-31T23:00:00Z · Confidence: medium

Hunt Hypothesis

The Parviz developer is likely associated with the Operation Cleaver group and may be attempting to establish a foothold in the environment through unknown initial access techniques. SOC teams should proactively hunt for this behavior to identify and mitigate potential advanced persistent threats linked to known malicious actors.

YARA Rule

rule OPCLEAVER_Parviz_Developer
{

    meta:
        description = "Parviz developer known from Operation Cleaver"
        reference = "http://cylance.com/assets/Cleaver/Cylance_Operation_Cleaver_Report.pdf"
        date = "2014/12/02"
        author = "Florian Roth"
        score = "70"

    strings:
        $s1 = "Users\\parviz\\documents\\" nocase

    condition:
        $s1
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 1 string patterns in its detection logic.

References

False Positive Guidance

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