Detection: Trickbot Named Pipe

Updated Date: 2024-05-16 ID: 1804b0a4-a682-11eb-8f68-acde48001122 Author: Teoderick Contreras, Splunk Type: TTP Product: Splunk Enterprise Security

Description

The following analytic detects the creation or connection to a named pipe associated with Trickbot malware. It leverages Sysmon EventCodes 17 and 18 to identify named pipes with the pattern "\pipe\*lacesomepipe". This activity is significant as Trickbot uses named pipes for communication with its command and control (C2) servers, facilitating data exfiltration and command execution. If confirmed malicious, this behavior could allow attackers to maintain persistence, execute arbitrary commands, and exfiltrate sensitive information from the compromised system.

Search

1`sysmon` EventCode IN (17,18) PipeName="\\pipe\\*lacesomepipe" 
2| stats  min(_time) as firstTime max(_time) as lastTime count by dest user_id EventCode PipeName signature Image process_id 
3| rename Image as process_name 
4| `security_content_ctime(firstTime)` 
5| `security_content_ctime(lastTime)` 
6| `trickbot_named_pipe_filter`

Data Source

Name	Platform	Sourcetype	Source	Supported App
Sysmon EventID 17	Windows	`'xmlwineventlog'`	`'XmlWinEventLog:Microsoft-Windows-Sysmon/Operational'`	N/A

Macros Used

Name	Value
security_content_ctime	`convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$)`
trickbot_named_pipe_filter	`search *`

trickbot_named_pipe_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Annotations

- MITRE ATT&CK

+ Kill Chain Phases

+ NIST

+ CIS

- Threat Actors

ID	Technique	Tactic
T1055	Process Injection	Defense Evasion

KillChainPhase.EXPLOITAITON

NistCategory.DE_CM

Cis18Value.CIS_10

APT32

APT37

APT41

APT5

Cobalt Group

Kimsuky

PLATINUM

Silence

TA2541

Turla

Wizard Spider

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Setting	Value
Disabled	true
Cron Schedule	`0 * * * *`
Earliest Time	`-70m@m`
Latest Time	`-10m@m`
Schedule Window	`auto`
Creates Notable	Yes
Rule Title	`%name%`
Rule Description	`%description%`
Notable Event Fields	user, dest
Creates Risk Event	True

This configuration file applies to all detections of type TTP. These detections will use Risk Based Alerting and generate Notable Events.

Implementation

To successfully implement this search, you need to be ingesting logs with the process name and pipename from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA. .

Known False Positives

unknown

Associated Analytic Story

Trickbot

Risk Based Analytics (RBA)

Risk Message	Risk Score	Impact	Confidence
Possible Trickbot namedpipe created on $dest$ by $process_name$	42	70	60

The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

References

Detection Testing

Test Type	Status	Dataset	Source	Sourcetype
Validation	✅ Passing	N/A	N/A	N/A
Unit	✅ Passing	Dataset	`XmlWinEventLog:Microsoft-Windows-Sysmon/Operational`	`xmlwineventlog`
Integration	✅ Passing	Dataset	`XmlWinEventLog:Microsoft-Windows-Sysmon/Operational`	`xmlwineventlog`

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

Source: GitHub | Version: 2