""ET CURRENT_EVENTS Inbound PowerShell Executing Base64 Decoded VBE from Temp 2018-11-29""
SID: 2026677
Revision: 2
Class Type: trojan-activity
Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_11_29, deployment Perimeter, performance_impact Low, signature_severity Major, tag PowerShell, tag Obfuscated, updated_at 2018_11_29
Reference:
Protocol: tcp
Source Network: $EXTERNAL_NET
Source Port: $HTTP_PORTS
Destination Network: $HOME_NET
Destination Port: any
Flow: established,from_server
Contents:
-
Value: "200"
-
Value: "|3a 3a|FromBase64String"
-
Value: "-Path|20|C|3a 5c|windows|5c|temp|5c|"
-
Value: "start-process|20|c|3a 5c|windows|5c|system32|5c|wscript.exe|20|-ArgumentList|20 22|c|3a 5c|windows|5c|temp|5c|"
-
Value: ".vbe|22|"
Within: 20
PCRE:
Special Options:
-
http_stat_code
-
file_data
-
nocase
-
nocase
-
nocase
-
fast_pattern