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Detects the password of the backdoored DropBear SSH Server - BlackEnergy

yara LOW 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: 2026-05-19T23:00:00Z · Confidence: medium

Hunt Hypothesis

The hypothesis is that an adversary may be using a compromised DropBear SSH server with a known backdoor password to maintain persistent access within a network. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential long-term persistence mechanisms and mitigate the risk of unauthorized access.

YARA Rule

rule BlackEnergy_BackdoorPass_DropBear_SSH 
{
    
    meta:
        description = "Detects the password of the backdoored DropBear SSH Server - BlackEnergy"
        author = "Florian Roth"
        reference = "http://feedproxy.google.com/~r/eset/blog/~3/BXJbnGSvEFc/"
        date = "2016-01-03"
        hash = "0969daac4adc84ab7b50d4f9ffb16c4e1a07c6dbfc968bd6649497c794a161cd"
    
    strings:
        $s1 = "passDs5Bu9Te7" fullword ascii
    
    condition:
        uint16(0) == 0x5a4d and $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_Blackenergy.yar