Name:Enumerate Users Local Group Using Telegram id:fcd74532-ae54-11eb-a5ab-acde48001122 version:6 date:2024-11-28 author:Teoderick Contreras, Splunk status:production type:TTP Description:The following analytic detects a Telegram process enumerating all network users in a local group. It leverages EventCode 4798, which is generated when a process enumerates a user's security-enabled local groups on a computer or device. This activity is significant as it may indicate an attempt to gather information on user accounts, a common precursor to further malicious actions. If confirmed malicious, this behavior could allow an attacker to map out user accounts, potentially leading to privilege escalation or lateral movement within the network. Data_source:
-Windows Event Log Security 4798
search:`wineventlog_security` EventCode=4798 CallerProcessName = "*\\telegram.exe" | stats count min(_time) as firstTime max(_time) as lastTime by user Computer EventCode CallerProcessName ProcessID SubjectUserSid SubjectDomainName SubjectLogonId | rename Computer as dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `enumerate_users_local_group_using_telegram_filter`
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:unknown References: -https://thedfirreport.com/2020/04/20/sqlserver-or-the-miner-in-the-basement/ -https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4798 drilldown_searches: name:'View the detection results for - "$user$" and "$dest$"' search:'%original_detection_search% | search user = "$user$" dest = "$dest$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$user$" and "$dest$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$", "$dest$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'XMRig' - 'Compromised Windows Host' asset_type:Endpoint confidence:100 impact:80 message:The Telegram application has been identified enumerating local groups on $dest$ by $user$. mitre_attack_id: - 'T1087' observable: name:'user' type:'User' - role: - 'Victim' name:'dest' type:'Hostname' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'user' - 'dest' - 'EventCode' - 'Process_Name' - 'Process_ID' - 'Account_Name' - 'Account_Domain' - 'Logon_ID' - 'Security_ID' - 'Message' risk_score:80 security_domain:endpoint
