known or approved applications used by the organization or usage of built-in functions. known false positives can be added to the remote_access_software_usage_exception.csv lookup to globally suppress these situations across all remote access content

Techniques

T1219

Sample rules

Detect Remote Access Software Usage FileInfo

source: splunk
technicques:
- T1219

Description

The following analytic detects the execution of processes with file or code signing attributes from known remote access software within the environment. It leverages Sysmon EventCode 1 data and cross-references a lookup table of remote access utilities such as AnyDesk, GoToMyPC, LogMeIn, and TeamViewer. This activity is significant as adversaries often use these tools to maintain unauthorized remote access. If confirmed malicious, this could allow attackers to persist in the environment, potentially leading to data exfiltration or further compromise of the network.

Detection logic

`sysmon` EventCode=1 
| stats count min(_time) as firstTime max(_time) as lastTime, values(Company) as Company values(Product) as Product by dest, user, parent_process_name, process_name, process 
| lookup remote_access_software remote_utility_fileinfo AS Product OUTPUT isutility, description as signature, comment_reference as desc, category 
| search isutility = True 
| `remote_access_software_usage_exceptions` 
| `detect_remote_access_software_usage_fileinfo_filter`

Detect Remote Access Software Usage File

source: splunk
technicques:
- T1219

Description

The following analytic detects the writing of files from known remote access software to disk within the environment. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on file path, file name, and user information. This activity is significant as adversaries often use remote access tools like AnyDesk, GoToMyPC, LogMeIn, and TeamViewer to maintain unauthorized access. If confirmed malicious, this could allow attackers to persist in the environment, potentially leading to data exfiltration, further compromise, or complete control over affected systems.

Detection logic


| tstats `security_content_summariesonly` count, min(_time) as firstTime, max(_time) as lastTime, values(Filesystem.file_path) as file_path from datamodel=Endpoint.Filesystem by Filesystem.dest, Filesystem.user, Filesystem.file_name 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `drop_dm_object_name(Filesystem)` 
| lookup remote_access_software remote_utility AS file_name OUTPUT isutility, description as signature, comment_reference as desc, category 
| search isutility = TRUE 
| `remote_access_software_usage_exceptions` 
| `detect_remote_access_software_usage_file_filter`