""ET WEB_SERVER LEMURLOOT WebShell Interaction Header - X-siLock-Step1 -1 Data Exfil Request - Observed in MOVEit File Transfer - INBOUND""
SID: 2046049
Revision: 1
Class Type: attempted-admin
Metadata: attack_target Web_Server, created_at 2023_06_02, deployment Perimeter, deployment SSLDecrypt, malware_family LEMURLOOT, performance_impact Low, confidence High, signature_severity Major, tag WebShell, updated_at 2023_06_02
Reference:
Protocol: tcp
Source Network: $EXTERNAL_NET
Source Port: any
Destination Network: [$HOME_NET,$HTTP_SERVERS]
Destination Port: any
Flow: established,to_server
Contents:
-
Value: "X-siLock-Step1|3a 20|-1"
-
Value: "X-siLock-Comment|3a 20|"
-
Value: "X-siLock-Step1|3a 20|"
Within:
PCRE: "/^X-siLock-Step1\x3a\x20[^\r\n]+[\r\n]+$/Hmi"
Special Options:
-
http_header
-
nocase
-
http_header
-
http_header