Esc
Phishing - T1566

(ATT&CK® Technique)
Subtechniques

Definition

Adversaries may send phishing messages to gain access to victim systems. All forms of phishing are electronically delivered social engineering. Phishing can be targeted, known as spearphishing. In spearphishing, a specific individual, company, or industry will be targeted by the adversary. More generally, adversaries can conduct non-targeted phishing, such as in mass malware spam campaigns.
D3FEND Inferred Relationships

Browse the D3FEND knowledge graph by clicking on the nodes below.
        graph LR;

     T1566["Phishing"] --> |produces| File["File"]; class T1566 OffensiveTechniqueNode;
        class File ArtifactNode; click File href "/dao/artifact/d3f:File";
        click T1566 href "/offensive-technique/attack/T1566/"; click File href "/dao/artifact/d3f:File"; T1566["Phishing"] --> |produces| URL["URL"]; class T1566 OffensiveTechniqueNode;
        class URL ArtifactNode; click URL href "/dao/artifact/d3f:URL";
        click T1566 href "/offensive-technique/attack/T1566/"; click URL href "/dao/artifact/d3f:URL"; T1566["Phishing"] --> |produces| InboundInternetMailTraffic["Inbound Internet Mail Traffic"]; class T1566 OffensiveTechniqueNode;
        class InboundInternetMailTraffic ArtifactNode; click InboundInternetMailTraffic href "/dao/artifact/d3f:InboundInternetMailTraffic";
        click T1566 href "/offensive-technique/attack/T1566/"; click InboundInternetMailTraffic href "/dao/artifact/d3f:InboundInternetMailTraffic"; T1566["Phishing"] --> |produces| Email["Email"]; class T1566 OffensiveTechniqueNode;
        class Email ArtifactNode; click Email href "/dao/artifact/d3f:Email";
        click T1566 href "/offensive-technique/attack/T1566/"; click Email href "/dao/artifact/d3f:Email";                                                    DecoyFile["Decoy File"] -->
          | spoofs | File["File"];

          DecoyFile["Decoy File"] -.->
            | May Deceive | T1566["Phishing"] ;
          class DecoyFile DefensiveTechniqueNode;
          class File ArtifactNode;
          click DecoyFile href "/technique/d3f:DecoyFile"; DecoyFile["Decoy File"] -->
          | spoofs | Email["Email"];

          
          class DecoyFile DefensiveTechniqueNode;
          class Email ArtifactNode;
          click DecoyFile href "/technique/d3f:DecoyFile";                           EmulatedFileAnalysis["Emulated File Analysis"] -->
          | analyzes | Email["Email"];

          EmulatedFileAnalysis["Emulated File Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class EmulatedFileAnalysis DefensiveTechniqueNode;
          class Email ArtifactNode;
          click EmulatedFileAnalysis href "/technique/d3f:EmulatedFileAnalysis"; DynamicAnalysis["Dynamic Analysis"] -->
          | analyzes | Email["Email"];

          DynamicAnalysis["Dynamic Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class DynamicAnalysis DefensiveTechniqueNode;
          class Email ArtifactNode;
          click DynamicAnalysis href "/technique/d3f:DynamicAnalysis";                           InboundSessionVolumeAnalysis["Inbound Session Volume Analysis"] -->
          | analyzes | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          InboundSessionVolumeAnalysis["Inbound Session Volume Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class InboundSessionVolumeAnalysis DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click InboundSessionVolumeAnalysis href "/technique/d3f:InboundSessionVolumeAnalysis";             NetworkTrafficCommunityDeviation["Network Traffic Community Deviation"] -->
          | analyzes | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          NetworkTrafficCommunityDeviation["Network Traffic Community Deviation"] -.->
            | May Detect | T1566["Phishing"] ;
          class NetworkTrafficCommunityDeviation DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click NetworkTrafficCommunityDeviation href "/technique/d3f:NetworkTrafficCommunityDeviation"; NetworkTrafficSignatureAnalysis["Network Traffic Signature Analysis"] -->
          | analyzes | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          NetworkTrafficSignatureAnalysis["Network Traffic Signature Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class NetworkTrafficSignatureAnalysis DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click NetworkTrafficSignatureAnalysis href "/technique/d3f:NetworkTrafficSignatureAnalysis";                  Client-serverPayloadProfiling["Client-server Payload Profiling"] -->
          | analyzes | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          Client-serverPayloadProfiling["Client-server Payload Profiling"] -.->
            | May Detect | T1566["Phishing"] ;
          class Client-serverPayloadProfiling DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click Client-serverPayloadProfiling href "/technique/d3f:Client-serverPayloadProfiling";                        PerHostDownload-UploadRatioAnalysis["Per Host Download-Upload Ratio Analysis"] -->
          | analyzes | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          PerHostDownload-UploadRatioAnalysis["Per Host Download-Upload Ratio Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class PerHostDownload-UploadRatioAnalysis DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click PerHostDownload-UploadRatioAnalysis href "/technique/d3f:PerHostDownload-UploadRatioAnalysis";              ProtocolMetadataAnomalyDetection["Protocol Metadata Anomaly Detection"] -->
          | analyzes | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          ProtocolMetadataAnomalyDetection["Protocol Metadata Anomaly Detection"] -.->
            | May Detect | T1566["Phishing"] ;
          class ProtocolMetadataAnomalyDetection DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click ProtocolMetadataAnomalyDetection href "/technique/d3f:ProtocolMetadataAnomalyDetection"; RemoteTerminalSessionDetection["Remote Terminal Session Detection"] -->
          | analyzes | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          RemoteTerminalSessionDetection["Remote Terminal Session Detection"] -.->
            | May Detect | T1566["Phishing"] ;
          class RemoteTerminalSessionDetection DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click RemoteTerminalSessionDetection href "/technique/d3f:RemoteTerminalSessionDetection";                           HomoglyphDetection["Homoglyph Detection"] -->
          | analyzes | Email["Email"];

          HomoglyphDetection["Homoglyph Detection"] -.->
            | May Detect | T1566["Phishing"] ;
          class HomoglyphDetection DefensiveTechniqueNode;
          class Email ArtifactNode;
          click HomoglyphDetection href "/technique/d3f:HomoglyphDetection"; HomoglyphDetection["Homoglyph Detection"] -->
          | analyzes | URL["URL"];

          
          class HomoglyphDetection DefensiveTechniqueNode;
          class URL ArtifactNode;
          click HomoglyphDetection href "/technique/d3f:HomoglyphDetection";                           URLAnalysis["URL Analysis"] -->
          | analyzes | URL["URL"];

          URLAnalysis["URL Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class URLAnalysis DefensiveTechniqueNode;
          class URL ArtifactNode;
          click URLAnalysis href "/technique/d3f:URLAnalysis";        IdentifierActivityAnalysis["Identifier Activity Analysis"] -->
          | analyzes | URL["URL"];

          IdentifierActivityAnalysis["Identifier Activity Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class IdentifierActivityAnalysis DefensiveTechniqueNode;
          class URL ArtifactNode;
          click IdentifierActivityAnalysis href "/technique/d3f:IdentifierActivityAnalysis";                    SenderReputationAnalysis["Sender Reputation Analysis"] -->
          | analyzes | Email["Email"];

          SenderReputationAnalysis["Sender Reputation Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class SenderReputationAnalysis DefensiveTechniqueNode;
          class Email ArtifactNode;
          click SenderReputationAnalysis href "/technique/d3f:SenderReputationAnalysis";              SenderMTAReputationAnalysis["Sender MTA Reputation Analysis"] -->
          | analyzes | Email["Email"];

          SenderMTAReputationAnalysis["Sender MTA Reputation Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class SenderMTAReputationAnalysis DefensiveTechniqueNode;
          class Email ArtifactNode;
          click SenderMTAReputationAnalysis href "/technique/d3f:SenderMTAReputationAnalysis";          UserGeolocationLogonPatternAnalysis["User Geolocation Logon Pattern Analysis"] -->
          | analyzes | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          UserGeolocationLogonPatternAnalysis["User Geolocation Logon Pattern Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class UserGeolocationLogonPatternAnalysis DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click UserGeolocationLogonPatternAnalysis href "/technique/d3f:UserGeolocationLogonPatternAnalysis";                  FileIntegrityMonitoring["File Integrity Monitoring"] -->
          | analyzes | File["File"];

          FileIntegrityMonitoring["File Integrity Monitoring"] -.->
            | May Detect | T1566["Phishing"] ;
          class FileIntegrityMonitoring DefensiveTechniqueNode;
          class File ArtifactNode;
          click FileIntegrityMonitoring href "/technique/d3f:FileIntegrityMonitoring"; FileIntegrityMonitoring["File Integrity Monitoring"] -->
          | analyzes | Email["Email"];

          
          class FileIntegrityMonitoring DefensiveTechniqueNode;
          class Email ArtifactNode;
          click FileIntegrityMonitoring href "/technique/d3f:FileIntegrityMonitoring";                           FileEviction["File Eviction"] -->
          | deletes | File["File"];

          FileEviction["File Eviction"] -.->
            | May Evict | T1566["Phishing"] ;
          class FileEviction DefensiveTechniqueNode;
          class File ArtifactNode;
          click FileEviction href "/technique/d3f:FileEviction"; FileEviction["File Eviction"] -->
          | deletes | Email["Email"];

          
          class FileEviction DefensiveTechniqueNode;
          class Email ArtifactNode;
          click FileEviction href "/technique/d3f:FileEviction";                           FileEncryption["File Encryption"] -->
          | encrypts | File["File"];

          FileEncryption["File Encryption"] -.->
            | May Harden | T1566["Phishing"] ;
          class FileEncryption DefensiveTechniqueNode;
          class File ArtifactNode;
          click FileEncryption href "/technique/d3f:FileEncryption"; FileEncryption["File Encryption"] -->
          | encrypts | Email["Email"];

          
          class FileEncryption DefensiveTechniqueNode;
          class Email ArtifactNode;
          click FileEncryption href "/technique/d3f:FileEncryption"; LocalFilePermissions["Local File Permissions"] -->
          | restricts | File["File"];

          LocalFilePermissions["Local File Permissions"] -.->
            | May Harden | T1566["Phishing"] ;
          class LocalFilePermissions DefensiveTechniqueNode;
          class File ArtifactNode;
          click LocalFilePermissions href "/technique/d3f:LocalFilePermissions"; LocalFilePermissions["Local File Permissions"] -->
          | restricts | Email["Email"];

          
          class LocalFilePermissions DefensiveTechniqueNode;
          class Email ArtifactNode;
          click LocalFilePermissions href "/technique/d3f:LocalFilePermissions";                                                     NetworkTrafficFiltering["Network Traffic Filtering"] -->
          | filters | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          NetworkTrafficFiltering["Network Traffic Filtering"] -.->
            | May Isolate | T1566["Phishing"] ;
          class NetworkTrafficFiltering DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click NetworkTrafficFiltering href "/technique/d3f:NetworkTrafficFiltering";              RestoreFile["Restore File"] -->
          | restores | File["File"];

          RestoreFile["Restore File"] -.->
            | May Restore | T1566["Phishing"] ;
          class RestoreFile DefensiveTechniqueNode;
          class File ArtifactNode;
          click RestoreFile href "/technique/d3f:RestoreFile"; RestoreFile["Restore File"] -->
          | restores | Email["Email"];

          
          class RestoreFile DefensiveTechniqueNode;
          class Email ArtifactNode;
          click RestoreFile href "/technique/d3f:RestoreFile";                                         FileAnalysis["File Analysis"] -->
          | analyzes | Email["Email"];

          FileAnalysis["File Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class FileAnalysis DefensiveTechniqueNode;
          class Email ArtifactNode;
          click FileAnalysis href "/technique/d3f:FileAnalysis"; FileAnalysis["File Analysis"] -->
          | analyzes | File["File"];

          
          class FileAnalysis DefensiveTechniqueNode;
          class File ArtifactNode;
          click FileAnalysis href "/technique/d3f:FileAnalysis";                           URLReputationAnalysis["URL Reputation Analysis"] -->
          | analyzes | URL["URL"];

          URLReputationAnalysis["URL Reputation Analysis"] -.->
            | May Detect | T1566["Phishing"] ;
          class URLReputationAnalysis DefensiveTechniqueNode;
          class URL ArtifactNode;
          click URLReputationAnalysis href "/technique/d3f:URLReputationAnalysis";              EmailRemoval["Email Removal"] -->
          | deletes | Email["Email"];

          EmailRemoval["Email Removal"] -.->
            | May Evict | T1566["Phishing"] ;
          class EmailRemoval DefensiveTechniqueNode;
          class Email ArtifactNode;
          click EmailRemoval href "/technique/d3f:EmailRemoval";              RestoreEmail["Restore Email"] -->
          | restores | Email["Email"];

          RestoreEmail["Restore Email"] -.->
            | May Restore | T1566["Phishing"] ;
          class RestoreEmail DefensiveTechniqueNode;
          class Email ArtifactNode;
          click RestoreEmail href "/technique/d3f:RestoreEmail";              InboundTrafficFiltering["Inbound Traffic Filtering"] -->
          | filters | InboundInternetMailTraffic["Inbound Internet Mail Traffic"];

          InboundTrafficFiltering["Inbound Traffic Filtering"] -.->
            | May Isolate | T1566["Phishing"] ;
          class InboundTrafficFiltering DefensiveTechniqueNode;
          class InboundInternetMailTraffic ArtifactNode;
          click InboundTrafficFiltering href "/technique/d3f:InboundTrafficFiltering";              EmailFiltering["Email Filtering"] -->
          | filters | Email["Email"];

          EmailFiltering["Email Filtering"] -.->
            | May Isolate | T1566["Phishing"] ;
          class EmailFiltering DefensiveTechniqueNode;
          class Email ArtifactNode;
          click EmailFiltering href "/technique/d3f:EmailFiltering";
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