suspicious_rundll32_activity

rule suspicious_rundll32_activity {
 meta:
    author = "juju4"
    description = "Detects suspicious process related to rundll32 based on arguments  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/wkXXRDEjMA9b"
    version = "0.01"
    created = "2021-03-09"
    category = "process_creation"
    product = "windows"
    mitre = "defense_evasion, execution, t1085"

  events:
((re.regex($selection.target.process.command_line, `.*\\rundll32\.exe.* url\.dll,.*OpenURL .*`) or re.regex($selection.target.process.command_line, `.*\\rundll32\.exe.* url\.dll,.*OpenURLA .*`) or re.regex($selection.target.process.command_line, `.*\\rundll32\.exe.* url\.dll,.*FileProtocolHandler .*`) or re.regex($selection.target.process.command_line, `.*\\rundll32\.exe.* zipfldr\.dll,.*RouteTheCall .*`) or re.regex($selection.target.process.command_line, `.*\\rundll32\.exe.* Shell32\.dll,.*Control_RunDLL .*`) or re.regex($selection.target.process.command_line, `.*\\rundll32\.exe javascript:.*`) or re.regex($selection.target.process.command_line, `.* url\.dll,.*OpenURL .*`) or re.regex($selection.target.process.command_line, `.* url\.dll,.*OpenURLA .*`) or re.regex($selection.target.process.command_line, `.* url\.dll,.*FileProtocolHandler .*`) or re.regex($selection.target.process.command_line, `.* zipfldr\.dll,.*RouteTheCall .*`) or re.regex($selection.target.process.command_line, `.* Shell32\.dll,.*Control_RunDLL .*`) or re.regex($selection.target.process.command_line, `.* javascript:.*`) or re.regex($selection.target.process.command_line, `.*\.RegisterXLL.*`)) and ($selection.metadata.product_event_type = "4688" or $selection.metadata.product_event_type = "1"))

  condition:
    $selection
}