IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Roshal Archive (RAR) or PowerShell File Downloaded from the Internet
editRoshal Archive (RAR) or PowerShell File Downloaded from the Internet
editDetects 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 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:
- packetbeat-*
Severity: medium
Risk score: 47
Runs every: None
Searches indices from: None (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Network
- Threat Detection
- Command and Control
version: 5
Rule authors:
- Elastic
Rule license: Elastic License v2
Investigation guide
edit## Threat intel This activity has been observed in FIN7 campaigns.
Rule query
editevent.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 )
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/