APT_CN__Package2_DLL_April2024

YARA detection rule by Yashraj Solanki - Cyber Threat Intelligence Analyst at Bridewell · Unknown

Rule APT_CN__Package2_DLL_April2024 (No description metadata provided).

import "pe"
rule APT_CN__Package2_DLL_April2024 {
    meta:
        Description = "Detects malware (Package 2) used by a Chinese APT targeting ASEAN entities"
        author = "Yashraj Solanki - Cyber Threat Intelligence Analyst at Bridewell"
        Reference = "https://unit42.paloaltonetworks.com/chinese-apts-target-asean-entities/"
        File_Hash = "5cd4003ccaa479734c7f5a01c8ff95891831a29d857757bbd7fe4294f3c5c126"
        Info = "This malicious DLL part of the SCR (Package 2) which contains a legit executable, a malicious executable and this DLL"
        date = "2024-04-03"
        yarahub_author_twitter = "@RustyNoob619"
        yarahub_reference_md5 = "720eefb3a1c668f8befc2b365a369d76"
        yarahub_uuid = "7eddc35d-d621-45a3-ae84-f17067ddb9a9"
        yarahub_license = "CC0 1.0"
        yarahub_rule_matching_tlp = "TLP:WHITE"
        yarahub_rule_sharing_tlp = "TLP:WHITE"
    
    strings:
        $str1 = "C:\\ProgramData\\updata" wide fullword
        $str2 = "estarmygame" wide

    condition:
        (pe.imphash() == "a069baeb4f8e125a451dc73aca6576b8"
        or (pe.imports("ADVAPI32.dll","RegCloseKey")
        and pe.imports("ADVAPI32.dll","RegOpenKeyExA")
        and pe.imports("KERNEL32.dll","IsProcessorFeaturePresent")
        and pe.imports("KERNEL32.dll","QueryPerformanceCounter")
        and pe.imports("KERNEL32.dll","IsDebuggerPresent")
        and pe.imports("ADVAPI32.dll","RegOpenKeyExA")
        and pe.imports("ADVAPI32.dll","RegSetValueExA")
        and pe.imports("SHELL32.dll","CommandLineToArgvW"))
        and pe.exports("RunServer"))
        and all of them

 }

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

06b5d45c-93b8-4fef-848c-0f5b5aa7dedf

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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