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Indexed Rules
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17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
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Active Rule
Office Application Initiated Network Connection To Non-Local IP
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Office Application Initiated Network Connection To Non-Local IP
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Office Application Initiated Network Connection To Non-Local IP
id: 75e33ce3-ae32-4dcc-9aa8-a2a3029d6f84
status: test
description: |
Detects an office application (Word, Excel, PowerPoint) that initiate a network connection to a non-private IP addresses.
This rule aims to detect traffic similar to one seen exploited in CVE-2021-42292.
This rule will require an initial baseline and tuning that is specific to your organization.
references:
- https://corelight.com/blog/detecting-cve-2021-42292
- https://learn.microsoft.com/de-de/microsoft-365/enterprise/urls-and-ip-address-ranges?view=o365-worldwide
author: Christopher Peacock '@securepeacock', SCYTHE '@scythe_io', Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems)
date: 2021-11-10
modified: 2025-10-17
tags:
- attack.execution
- attack.t1203
logsource:
category: network_connection
product: windows
detection:
selection:
Image|endswith:
- '\excel.exe'
- '\outlook.exe'
- '\powerpnt.exe'
- '\winword.exe'
- '\wordview.exe'
Initiated: 'true'
filter_main_local_ranges:
DestinationIp|cidr:
- '127.0.0.0/8'
- '10.0.0.0/8'
- '172.16.0.0/12'
- '192.168.0.0/16'
- '169.254.0.0/16'
- '::1/128' # IPv6 loopback
- 'fe80::/10' # IPv6 link-local addresses
- 'fc00::/7' # IPv6 private addresses
filter_main_msrange_generic:
DestinationIp|cidr:
- '2.16.56.0/23' # Akamai International B.V.
- '2.17.248.0/21' # Akamai International B.V.
- '13.107.240.0/21' # Microsoft Corporation
- '20.184.0.0/13' # Microsoft Corporation
- '23.61.224.0/20' # Akamai-AS
- '20.192.0.0/10' # Microsoft Corporation
- '23.72.0.0/13' # Akamai International B.V.
- '23.3.88.0/22' # Akamai-AS
- '23.216.132.0/22' # Akamai-AS
- '40.76.0.0/14' # Microsoft Corporation
- '51.10.0.0/15' # Microsoft Corporation
- '51.103.0.0/16' # Microsoft Corporation
- '51.104.0.0/15' # Microsoft Corporation
- '51.142.136.0/22' # Microsoft Corporation - https://ipinfo.io/AS8075/51.140.0.0/14-51.142.136.0/22
- '52.160.0.0/11' # Microsoft Corporation - https://ipinfo.io/AS8075/52.160.0.0/11
- '95.101.96.0/21' # Akamai-As
- '204.79.197.0/24' # Microsoft Corporation
filter_main_msrange_exchange_1:
# Exchange Online
# "urls": [
# "outlook.cloud.microsoft",
# "outlook.office.com",
# "outlook.office365.com"
# ]
DestinationIp|cidr:
- '13.107.4.0/22'
- '13.107.6.152/31'
- '13.107.18.10/31'
- '13.107.42.0/23'
- '13.107.128.0/22'
- '23.35.224.0/20'
- '23.53.40.0/22'
- '23.103.160.0/20'
- '23.216.76.0/22'
- '40.96.0.0/13'
- '40.104.0.0/15'
- '52.96.0.0/14'
- '131.253.33.215/32'
- '132.245.0.0/16'
- '150.171.32.0/22'
- '204.79.197.215/32'
- '2603:1006::/40'
- '2603:1016::/36'
- '2603:1026::/36'
- '2603:1036::/36'
- '2603:1046::/36'
- '2603:1056::/36'
- '2620:1ec:4::152/128'
- '2620:1ec:4::153/128'
- '2620:1ec:c::10/128'
- '2620:1ec:c::11/128'
- '2620:1ec:d::10/128'
- '2620:1ec:d::11/128'
- '2620:1ec:8f0::/46'
- '2620:1ec:900::/46'
- '2620:1ec:a92::152/128'
- '2620:1ec:a92::153/128'
DestinationPort:
- 80
- 443
filter_main_msrange_exchange_2:
# Exchange Online
# "urls": [
# "outlook.office365.com",
# "smtp.office365.com"
# ]
DestinationIp|cidr:
- '13.107.6.152/31'
- '13.107.18.10/31'
- '13.107.128.0/22'
- '23.103.160.0/20'
- '40.96.0.0/13'
- '40.104.0.0/15'
- '52.96.0.0/14'
- '131.253.33.215/32'
- '132.245.0.0/16'
- '150.171.32.0/22'
- '204.79.197.215/32'
- '2603:1006::/40'
- '2603:1016::/36'
- '2603:1026::/36'
- '2603:1036::/36'
- '2603:1046::/36'
- '2603:1056::/36'
- '2620:1ec:4::152/128'
- '2620:1ec:4::153/128'
- '2620:1ec:c::10/128'
- '2620:1ec:c::11/128'
- '2620:1ec:d::10/128'
- '2620:1ec:d::11/128'
- '2620:1ec:8f0::/46'
- '2620:1ec:900::/46'
- '2620:1ec:a92::152/128'
- '2620:1ec:a92::153/128'
DestinationPort:
- 143
- 587
- 993
- 995
Protocol: 'tcp'
filter_main_msrange_exchange_3:
# Exchange Online
# "urls": [
# "*.protection.outlook.com"
# ]
DestinationIp|cidr:
- '40.92.0.0/15'
- '40.107.0.0/16'
- '52.100.0.0/14'
- '52.238.78.88/32'
- '104.47.0.0/17'
- '2a01:111:f400::/48'
- '2a01:111:f403::/48'
DestinationPort: 443
filter_main_msrange_exchange_4:
# Exchange Online
# "urls": [
# "*.mail.protection.outlook.com",
# "*.mx.microsoft"
# ]
DestinationIp|cidr:
- '40.92.0.0/15'
- '40.107.0.0/16'
- '52.100.0.0/14'
- '52.238.78.88/32'
- '104.47.0.0/17'
- '2a01:111:f400::/48'
- '2a01:111:f403::/48'
DestinationPort: 25
filter_main_msrange_sharepoint_1:
# SharePoint Online and OneDrive for Business",
# "urls": [
# "*.sharepoint.com"
# ]
DestinationIp|cidr:
- '13.107.136.0/22'
- '40.108.128.0/17'
- '52.104.0.0/14'
- '104.146.128.0/17'
- '150.171.40.0/22'
- '2603:1061:1300::/40'
- '2620:1ec:8f8::/46'
- '2620:1ec:908::/46'
- '2a01:111:f402::/48'
DestinationPort:
- 80
- 443
Protocol: 'tcp'
filter_main_msrange_office_1:
# Microsoft 365 Common and Office Online",
# "urls": [
# "*.officeapps.live.com",
# "*.online.office.com",
# "office.live.com",
# "office.com.akadns.net"
# ],
DestinationIp|cidr:
- '13.107.6.171/32'
- '13.107.18.15/32'
- '13.107.140.6/32'
- '20.64.0.0/10'
- '52.108.0.0/14'
- '52.244.37.168/32'
- '2603:1006:1400::/40'
- '2603:1016:2400::/40'
- '2603:1026:2400::/40'
- '2603:1036:2400::/40'
- '2603:1046:1400::/40'
- '2603:1056:1400::/40'
- '2603:1063:2000::/38'
- '2620:1ec:c::15/128'
- '2620:1ec:8fc::6/128'
- '2620:1ec:a92::171/128'
- '2a01:111:f100:2000::a83e:3019/128'
- '2a01:111:f100:2002::8975:2d79/128'
- '2a01:111:f100:2002::8975:2da8/128'
- '2a01:111:f100:7000::6fdd:6cd5/128'
- '2a01:111:f100:a004::bfeb:88cf/128'
DestinationPort:
- 80
- 443
Protocol: 'tcp'
filter_main_msrange_office_2:
# Microsoft 365 Common and Office Online
# "urls": [
# "*.auth.microsoft.com",
# "*.msftidentity.com",
# "*.msidentity.com",
# "account.activedirectory.windowsazure.com",
# "accounts.accesscontrol.windows.net",
# "adminwebservice.microsoftonline.com",
# "api.passwordreset.microsoftonline.com",
# "autologon.microsoftazuread-sso.com",
# "becws.microsoftonline.com",
# "ccs.login.microsoftonline.com",
# "clientconfig.microsoftonline-p.net",
# "cloudapp.azure.com",
# "companymanager.microsoftonline.com",
# "device.login.microsoftonline.com",
# "graph.microsoft.com",
# "graph.windows.net",
# "login-us.microsoftonline.com",
# "login.microsoft.com",
# "login.microsoftonline-p.com",
# "login.microsoftonline.com",
# "login.windows.net",
# "logincert.microsoftonline.com",
# "loginex.microsoftonline.com",
# "nexus.microsoftonline-p.com",
# "passwordreset.microsoftonline.com",
# "provisioningapi.microsoftonline.com",
# "web.core.windows.net",
# ]
DestinationIp|cidr:
- '172.128.0.0/10'
- '20.20.32.0/19'
- '20.103.156.88/32' # msn.com
- '20.190.128.0/18'
- '20.231.128.0/19'
- '40.126.0.0/18'
- '57.150.0.0/15'
- '2603:1006:2000::/48'
- '2603:1007:200::/48'
- '2603:1016:1400::/48'
- '2603:1017::/48'
- '2603:1026:3000::/48'
- '2603:1027:1::/48'
- '2603:1036:3000::/48'
- '2603:1037:1::/48'
- '2603:1046:2000::/48'
- '2603:1047:1::/48'
- '2603:1056:2000::/48'
- '2603:1057:2::/48'
DestinationPort:
- 80
- 443
Protocol: 'tcp'
filter_main_msrange_office_3:
# Microsoft 365 Common and Office Online
# "urls": [
# "*.compliance.microsoft.com",
# "*.data.microsoft.com",
# "*.protection.office.com",
# "*.security.microsoft.com",
# "compliance.microsoft.com",
# "defender.microsoft.com",
# "protection.office.com",
# "security.microsoft.com",
# "teams.microsoft.com",
# ]
DestinationIp|cidr:
- '13.64.0.0/11'
- '13.107.6.192/32'
- '13.107.9.192/32'
- '13.89.179.14/32'
- '20.40.0.0/14'
- '20.48.0.0/12'
- '20.64.0.0/12'
- '52.123.0.0/16'
- '52.108.0.0/14'
- '52.136.0.0/13'
- '57.150.0.0/15'
- '80.239.150.67/32' # Arelion Sweden AB
- '2620:1ec:4::192/128'
- '2620:1ec:a92::192/128'
DestinationPort: 443
Protocol: 'tcp'
filter_main_destination_host:
DestinationHostname|endswith: '.deploy.static.akamaitechnologies.com'
DestinationPort: 443
Protocol: 'tcp'
condition: selection and not 1 of filter_main_*
falsepositives:
- You may have to tune certain domains out that Excel may call out to, such as microsoft or other business use case domains.
- Office documents commonly have templates that refer to external addresses, like "sharepoint.ourcompany.com" may have to be tuned.
- It is highly recommended to baseline your activity and tune out common business use cases.
level: medium
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/network_connection/net_connection_win_office_outbound_non_local_ip.yml