Roshal Archive (RAR) or PowerShell File Downloaded from the Internetedit
Detects a Roshal Archive (RAR) file or PowerShell script downloaded from the internet by an internal host. Gaining initial access to a system and then downloading encoded or encrypted tools to move laterally is a common practice for adversaries as a way to protect their more valuable tools and tactics, techniques, and procedures (TTPs). This may be atypical behavior for a managed network and can be indicative of malware, exfiltration, or command and control.
Rule type: query
Rule indices:
- auditbeat-*
- filebeat-*
- packetbeat-*
- logs-endpoint.events.*
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Network
- Threat Detection
- Command and Control
- Host
Version: 100 (version history)
Added (Elastic Stack release): 7.10.0
Last modified (Elastic Stack release): 8.5.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positivesedit
Downloading RAR or PowerShell files from the Internet may be expected for certain systems. This rule should be tailored to either exclude systems as sources or destinations in which this behavior is expected.
Investigation guideedit
## Threat intel This activity has been observed in FIN7 campaigns.
Rule queryedit
event.category:(network or network_traffic) and network.protocol:http and (url.extension:(ps1 or rar) or url.path:(*.ps1 or *.rar)) and not destination.ip:( 10.0.0.0/8 or 127.0.0.0/8 or 169.254.0.0/16 or 172.16.0.0/12 or 192.0.0.0/24 or 192.0.0.0/29 or 192.0.0.8/32 or 192.0.0.9/32 or 192.0.0.10/32 or 192.0.0.170/32 or 192.0.0.171/32 or 192.0.2.0/24 or 192.31.196.0/24 or 192.52.193.0/24 or 192.168.0.0/16 or 192.88.99.0/24 or 224.0.0.0/4 or 100.64.0.0/10 or 192.175.48.0/24 or 198.18.0.0/15 or 198.51.100.0/24 or 203.0.113.0/24 or 240.0.0.0/4 or "::1" or "FE80::/10" or "FF00::/8" ) and source.ip:( 10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16 )
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
-
Technique:
- Name: Ingress Tool Transfer
- ID: T1105
- Reference URL: https://attack.mitre.org/techniques/T1105/
Rule version historyedit
- Version 100 (8.5.0 release)
-
- Formatting only
- Version 10 (8.4.0 release)
-
- Formatting only
- Version 9 (8.0.0 release)
-
- Formatting only
- Version 8 (7.16.0 release)
-
- Formatting only
- Version 7 (7.15.0 release)
-
- Formatting only
- Version 6 (7.14.0 release)
-
-
Updated query, changed from:
event.category:(network OR network_traffic) AND network.protocol:http AND url.path:/.*(rar|ps1)/ AND source.ip:(10.0.0.0\/8 OR 172.16.0.0\/12 OR 192.168.0.0\/16)
-
- Version 4 (7.13.0 release)
-
- Formatting only
- Version 3 (7.12.0 release)
-
- Formatting only
- Version 2 (7.11.2 release)
-
- Formatting only