← Back to SOC feed Coverage →

Chinese Hacktool Set - file dbexpora.dll

yara LOW Yara-Rules
community
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: 2026-07-15T23:00:00Z · Confidence: medium

Hunt Hypothesis

This detection rule identifies the presence of the dbexpora.dll artifact associated with a known Chinese hacktool set, signaling potential reconnaissance or data exfiltration activities by regional threat actors. Proactively hunting for this file in Azure Sentinel is critical to validate its legitimacy and ensure that authorized business tools are not being leveraged as a foothold for persistent adversary operations within the environment.

YARA Rule

rule dbexpora {
	meta:
		description = "Chinese Hacktool Set - file dbexpora.dll"
		author = "Florian Roth"
		reference = "http://tools.zjqhr.com/"
		date = "2015-06-13"
		hash = "b55b007ef091b2f33f7042814614564625a8c79f"
	strings:
		$s0 = "SELECT A.USER FROM SYS.USER_USERS A " fullword ascii
		$s12 = "OCI 8 - OCIDescriptorFree" fullword ascii
		$s13 = "ORACommand *" fullword ascii
	condition:
		uint16(0) == 0x5a4d and filesize < 835KB and all of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 3 string patterns in its detection logic.

References

False Positive Guidance

Here are 4 specific false positive scenarios for the Chinese Hacktool Set - file dbexpora.dll detection rule, tailored for an enterprise environment:

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