LOLBin Remote Payload Execution

KQL detection rule by kyhomelab · MIT

Hunts for living-off-the-land binaries (rundll32, regsvr32, mshta, msiexec) executing remote or URL-based payloads — a common technique for proxy execution and AV bypass.

// Title: LOLBin Remote Payload Execution
// Description: Hunts for living-off-the-land binaries (rundll32, regsvr32, mshta, msiexec) executing remote or URL-based payloads — a common technique for proxy execution and AV bypass.
// Category: Security
// MITRE: T1218 (Signed Binary Proxy Execution)

DeviceProcessEvents
| where TimeGenerated > ago(7d)
| where FileName in~ ("rundll32.exe", "regsvr32.exe", "mshta.exe", "msiexec.exe")
// Look for remote indicators in command line
| where ProcessCommandLine has_any ("http://", "https://", "\\\\", "ftp://")
    or ProcessCommandLine matches regex @"(?i)scrobj\.dll"     // regsvr32 scriptlet abuse (Squiblydoo)
    or ProcessCommandLine has "javascript:"
    or ProcessCommandLine has "vbscript:"
// Exclude common false positives — tune for your environment
| where InitiatingProcessFileName !in~ ("msiexec.exe", "trustedinstaller.exe", "ccmexec.exe")
| extend Technique = case(
    FileName =~ "regsvr32.exe" and ProcessCommandLine has "scrobj.dll", "Squiblydoo (regsvr32 scriptlet)",
    FileName =~ "mshta.exe" and ProcessCommandLine has_any ("http", "javascript:", "vbscript:"), "MSHTA remote script",
    FileName =~ "rundll32.exe" and ProcessCommandLine has "javascript:", "Rundll32 JavaScript",
    FileName =~ "msiexec.exe" and ProcessCommandLine has_any ("http://", "https://"), "MSI remote install",
    "LOLBin remote payload"
)
| project
    TimeGenerated,
    DeviceName,
    AccountName,
    Technique,
    LOLBin = FileName,
    ParentProcess = InitiatingProcessFileName,
    ParentCommandLine = InitiatingProcessCommandLine,
    CommandLine = ProcessCommandLine,
    SHA256
| order by TimeGenerated desc

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

12459def-d698-4bb2-a24a-dddd03615513

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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 ]]

What does this mean?

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 ]]

What do these messages mean?

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

[[ currentRule.title ]]

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