DLL_Banking_Trojan_Chavecloak_March2024

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

Rule DLL_Banking_Trojan_Chavecloak_March2024 (No description metadata provided).

import "pe"
rule DLL_Banking_Trojan_Chavecloak_March2024 {
    meta:
        Description = "Detects the lightshot DLL (Final Payload) which is the Chavecloak Banking Trojan which was used to target banks in Brazil"
        author = "Yashraj Solanki - Cyber Threat Intelligence Analyst at Bridewell"
        Reference = "https://www.fortinet.com/blog/threat-research/banking-trojan-chavecloak-targets-brazil"
        Hash = "131d2aa44782c8100c563cd5febf49fcb4d26952d7e6e2ef22f805664686ffff"
        date = "2024-03-05"
        yarahub_author_twitter = "@RustyNoob619"
        yarahub_reference_md5 = "fea6fc878029babdca3a1579be0ae771"
        yarahub_uuid = "c8bafb42-adf5-4f6a-9a6f-940f69054a8e"
        yarahub_license = "CC0 1.0"
        yarahub_rule_matching_tlp = "TLP:WHITE"
        yarahub_rule_sharing_tlp = "TLP:WHITE"

   condition:
          pe.number_of_signatures == 0

          and pe.imports("user32.dll","ActivateKeyboardLayout")
          and pe.imports("user32.dll","KillTimer")
          and pe.imports("user32.dll","OpenClipboard")
          and pe.imports("user32.dll","AdjustWindowRectEx")

          and pe.imports("advapi32.dll","RegUnLoadKeyW")
          and pe.imports("advapi32.dll","RegFlushKey")

          and pe.imports("comctl32.dll","_TrackMouseEvent")
          and pe.imports("comctl32.dll","InitCommonControls")

          and pe.imports("ole32.dll","IsEqualGUID")
          and pe.imports("winmm.dll","timeGetTime")
          and pe.imports("winspool.drv","DocumentPropertiesW")
          and pe.imports("shell32.dll","Shell_NotifyIconW")
          and pe.imports("netapi32.dll","NetWkstaGetInfo")
          and pe.imports("version.dll","VerQueryValueW")

          and pe.exports("DeinitLightshot")
          and pe.exports("InitLightshot")
          and pe.exports("MakeScreenshotByCommand")
          and pe.exports("MakeScreenshot")

 }

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

4d2efd1a-331b-4137-86d6-d0ee7aabe92e

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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

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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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