Suspicious Msoffice Networkconnection

KQL detection rule by reversinglabs · MIT

this query detects network connections from MS office products to non-office domains

// this query detects network connections from MS office products to non-office domains
let OfficeApps = dynamic(["winword.exe","excel.exe","powerpnt.exe","mspub.exe","visio.exe","wordpad.exe","wordview.exe","onenote.exe", "onenotem.exe","onenoteviewer.exe","onenoteim.exe", "msaccess.exe"]);
let OfficeDomains = dynamic(["office.com", "office.net"]);
SysmonParser
| where EventID == 22
| where Image has_any (OfficeApps)
| where not (QueryName has_any (OfficeDomains))
| union (DeviceNetworkEvents
| where ActionType == "ConnectionSuccess"
| where InitiatingProcessFileName has_any (OfficeApps)
| where not (RemoteUrl has_any (OfficeDomains)))

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

5378abbe-0775-4f8b-a844-0115088060c8

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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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