This analytic will detect a suspicious Telegram process enumerating all network users in a local group. This technique was seen in a Monero infected honeypot to mapped all the users on the compromised system. EventCode 4798 is generated when a process enumerates a user's security-enabled local groups on a computer or device.
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2021-05-06
- Author: Teoderick Contreras, Splunk
- ID: fcd74532-ae54-11eb-a5ab-acde48001122
Kill Chain Phase
- CIS 10
1 2 3 4 5 `wineventlog_security` EventCode=4798 Process_Name = "*\\telegram.exe" | stats count min(_time) as firstTime max(_time) as lastTime by ComputerName EventCode Process_Name Process_ID Account_Name Account_Domain Logon_ID Security_ID Message | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `enumerate_users_local_group_using_telegram_filter`
The SPL above uses the following Macros:
enumerate_users_local_group_using_telegram_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
To successfully implement this search, you need to be ingesting logs with the Task Schedule (Exa. Security Log EventCode 4798) endpoints. Tune and filter known instances of process like logonUI used in your environment.
Known False Positives
Associated Analytic Story
|80.0||80||100||The Telegram application has been identified enumerating local groups on $ComputerName$ by $user$.|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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