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Sigma Rule Update (2024-04-29 13:44:31) (#658)
Co-authored-by: fukusuket <41001169+fukusuket@users.noreply.github.com>
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sigma/sysmon/network_connection/net_connection_win_dialer_initiated_connection.yml
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title: Outbound Network Connection Initiated By Microsoft Dialer | ||
id: 867373a9-7f8b-1d28-0c6b-770fc707dbbb | ||
related: | ||
- id: 37e4024a-6c80-4d8f-b95d-2e7e94f3a8d1 | ||
type: derived | ||
status: experimental | ||
description: | | ||
Detects outbound network connection initiated by Microsoft Dialer. | ||
The Microsoft Dialer, also known as Phone Dialer, is a built-in utility application included in various versions of the Microsoft Windows operating system. Its primary function is to provide users with a graphical interface for managing phone calls via a modem or a phone line connected to the computer. | ||
This is an outdated process in the current conext of it's usage and is a common target for info stealers for process injection, and is used to make C2 connections, common example is "Rhadamanthys" | ||
references: | ||
- hhttps://tria.ge/240301-rk34sagf5x/behavioral2 | ||
- https://app.any.run/tasks/6720b85b-9c53-4a12-b1dc-73052a78477d | ||
- https://research.checkpoint.com/2023/rhadamanthys-v0-5-0-a-deep-dive-into-the-stealers-components/ | ||
- https://strontic.github.io/xcyclopedia/library/dialer.exe-0B69655F912619756C704A0BF716B61F.html | ||
author: CertainlyP | ||
date: 2024/04/26 | ||
tags: | ||
- attack.execution | ||
- attack.t1071.001 | ||
- sysmon | ||
logsource: | ||
category: network_connection | ||
product: windows | ||
detection: | ||
network_connection: | ||
EventID: 3 | ||
Channel: Microsoft-Windows-Sysmon/Operational | ||
selection: | ||
Image|endswith: :\Windows\System32\dialer.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 | ||
condition: network_connection and (selection and not 1 of filter_main_*) | ||
falsepositives: | ||
- In Modern Windows systems, unable to see legitimate usage of this process, However, if an organization has legitimate purpose for this there can be false positives. | ||
level: high | ||
ruletype: Sigma |