ET MALWARE [NVISO] Observed BRICKSTORM Domain (ms-azure .azdatastore .workers .dev) in TLS SNI
Sourceet/open
CreatedApril 15, 2025
UpdatedApril 15, 2025
Classificationdomain-c2
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [NVISO] Observed BRICKSTORM Domain (ms-azure .azdatastore .workers .dev) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".ms-azure.azdatastore.workers.dev"; endswith; fast_pattern; reference:url,blog.nviso.eu/wp-content/uploads/2025/04/NVISO-BRICKSTORM-Report.pdf; classtype:domain-c2; sid:2061595; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2025_04_15, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag BRICKSTORM, updated_at 2025_04_15, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)
Metadata
affected productWindows_XP_Vista_7_8_10_Server_32_64_Bit
attack targetClient_and_Server
created at2025_04_15
deploymentPerimeter
performance impactLow
confidenceHigh
signature severityMajor
tagBRICKSTORM
updated at2025_04_15
mitre tactic idTA0037
mitre tactic nameCommand_And_Control
mitre technique idT1041
mitre technique nameExfiltration_Over_C2_Channel
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