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Insta11 Identifying Strings

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: 2026-06-16T11:00:00Z · Confidence: medium

Hunt Hypothesis

Adversaries may use hardcoded strings to exfiltrate data or communicate with command-and-control servers, which could indicate the presence of malicious activity. SOC teams should proactively hunt for these strings in Azure Sentinel to identify potential data exfiltration or C2 communication attempts early.

YARA Rule

rule Insta11Strings : Insta11 Family
{
    meta:
        description = "Insta11 Identifying Strings"
        author = "Seth Hardy"
        last_modified = "2014-06-23"
        
    strings:
        $ = "XTALKER7"
        $ = "Insta11 Microsoft" wide ascii
        $ = "wudMessage"
        $ = "ECD4FC4D-521C-11D0-B792-00A0C90312E1"
        $ = "B12AE898-D056-4378-A844-6D393FE37956"
        
    condition:
       any of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/MALW_Install11.yar