Analytics Story: FIN7

Date: 2021-09-14 ID: df2b00d3-06ba-49f1-b253-b19cef19b569 Author: Teoderick Contreras, Splunk Product: Splunk Enterprise Security

Description

Leverage searches that allow you to detect and investigate unusual activities that might relate to the FIN7 JS Implant and JSSLoader, including looking for Image Loading of ldap and wmi modules, associated with its payload, data collection and script execution.

Why it matters

FIN7 is a Russian criminal advanced persistent threat group that has primarily targeted the U.S. retail, restaurant, and hospitality sectors since mid-2015. A portion of FIN7 is run out of the front company Combi Security. It has been called one of the most successful criminal hacking groups in the world. this passed few day FIN7 tools and implant are seen in the wild where its code is updated. the FIN& is known to use the spear phishing attack as a entry to targetted network or host that will drop its staging payload like the JS and JSSloader. Now this artifacts and implants seen downloading other malware like cobaltstrike and event ransomware to encrypt host.

1| tstats `security_content_summariesonly` min(_time) as firstTime max(_time) as lastTime sum(All_Risk.calculated_risk_score) as risk_score, count(All_Risk.calculated_risk_score) as risk_event_count, values(All_Risk.annotations.mitre_attack.mitre_tactic_id) as annotations.mitre_attack.mitre_tactic_id, dc(All_Risk.annotations.mitre_attack.mitre_tactic_id) as mitre_tactic_id_count, values(All_Risk.annotations.mitre_attack.mitre_technique_id) as annotations.mitre_attack.mitre_technique_id, dc(All_Risk.annotations.mitre_attack.mitre_technique_id) as mitre_technique_id_count, values(All_Risk.tag) as tag, values(source) as source, dc(source) as source_count from datamodel=Risk.All_Risk where source IN ("*Cmdline Tool Not Executed In CMD Shell*", "*Windows System Network Config Discovery Display DNS*", "*Local Account Discovery With Wmic*", "*Net Localgroup Discovery*", "*Create local admin accounts using net exe*", "*Local Account Discovery with Net*", "*Icacls Deny Command*", "*ICACLS Grant Command*", "*Windows Proxy Via Netsh*", "*Processes launching netsh*", "*Disabling Firewall with Netsh*", "*Windows System Network Connections Discovery Netsh*", "*Network Connection Discovery With Arp*", "*Windows System Discovery Using ldap Nslookup*", "*Windows System Shutdown CommandLine*") by All_Risk.risk_object All_Risk.risk_object_type All_Risk.annotations.mitre_attack.mitre_tactic | `drop_dm_object_name(All_Risk)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | where source_count >= 4 | `windows_common_abused_cmd_shell_risk_behavior_filter`

Detections

Name ▲▼ Technique ▲▼ Type ▲▼
Check Elevated CMD using whoami System Owner/User Discovery TTP
Cmdline Tool Not Executed In CMD Shell Command and Scripting Interpreter, JavaScript TTP
Jscript Execution Using Cscript App Command and Scripting Interpreter, JavaScript TTP
MS Scripting Process Loading Ldap Module Command and Scripting Interpreter, JavaScript Anomaly
MS Scripting Process Loading WMI Module Command and Scripting Interpreter, JavaScript Anomaly
Non Chrome Process Accessing Chrome Default Dir Credentials from Password Stores, Credentials from Web Browsers Anomaly
Non Firefox Process Access Firefox Profile Dir Credentials from Password Stores, Credentials from Web Browsers Anomaly
Office Application Drop Executable Phishing, Spearphishing Attachment TTP
Office Product Spawning Wmic Phishing, Spearphishing Attachment TTP
Vbscript Execution Using Wscript App Visual Basic, Command and Scripting Interpreter TTP
Wscript Or Cscript Suspicious Child Process Process Injection, Create or Modify System Process, Parent PID Spoofing, Access Token Manipulation TTP
XSL Script Execution With WMIC XSL Script Processing TTP

Data Sources

Name ▲▼ Platform ▲▼ Sourcetype ▲▼ Source ▲▼
CrowdStrike ProcessRollup2 N/A crowdstrike:events:sensor crowdstrike
Sysmon EventID 1 Windows icon Windows xmlwineventlog XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
Sysmon EventID 11 Windows icon Windows xmlwineventlog XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
Sysmon EventID 7 Windows icon Windows xmlwineventlog XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
Windows Event Log Security 4663 Windows icon Windows xmlwineventlog XmlWinEventLog:Security
Windows Event Log Security 4688 Windows icon Windows xmlwineventlog XmlWinEventLog:Security

References

Source: GitHub | Version: 1