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Chinese Hacktool Set - file scan.exe

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: 2026-07-16T23:00:00Z · Confidence: medium

Hunt Hypothesis

This detection identifies the presence of scan.exe, a known component of the Chinese Hacktool malware suite, which adversaries often deploy to establish persistence and conduct initial reconnaissance within Azure environments. Proactively hunting for this artifact is critical because its low severity classification may cause it to be overlooked during routine monitoring, allowing attackers to maintain a stealthy foothold before escalating their activities.

YARA Rule

rule Tools_scan {
	meta:
		description = "Chinese Hacktool Set - file scan.exe"
		author = "Florian Roth"
		reference = "http://tools.zjqhr.com/"
		date = "2015-06-13"
		hash = "c580a0cc41997e840d2c0f83962e7f8b636a5a13"
	strings:
		$s2 = "Shanlu Studio" fullword wide
		$s3 = "_AutoAttackMain" fullword ascii
		$s4 = "_frmIpToAddr" fullword ascii
	condition:
		uint16(0) == 0x5a4d and filesize < 3000KB 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 5 specific false positive scenarios for the Chinese Hacktool Set - file scan.exe detection rule in an enterprise environment, along with suggested filters or exclusions:

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