""ET TROJAN Mespinoza Ransomware - Pre-Encryption File Exfil to CnC""
SID: 2033343
Revision: 1
Class Type: trojan-activity
Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_07_15, deployment Perimeter, malware_family Mespinoza, signature_severity Major, tag Ransomware, updated_at 2021_07_15, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: established,to_server
Contents:
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Value: "/upload-" Depth: 8
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Value: "?token="
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Value: "&id="
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Value: "&fullPath="
Within:
PCRE: "/\?token=(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})/U"
Special Options:
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fast_pattern
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http_uri
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http_uri
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http_uri
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http_uri