Coletar registros do Zscaler CASB

Este documento descreve como exportar registros do Zscaler CASB configurando um feed de operações de segurança do Google e mapeando campos de registro para o Modelo de Dados Unificado (UDM).

Para mais informações, consulte Visão geral da ingestão de dados no Google SecOps.

Uma implantação típica consiste no Zscaler CASB e em um feed de webhook do Google SecOps configurado para enviar registros ao Google SecOps. No entanto, os detalhes da implantação podem variar de acordo com o cliente e podem ser mais complexos.

A implantação contém os seguintes componentes:

  • Zscaler CASB: a plataforma de onde você coleta registros.

  • Feed do Google SecOps: o feed do Google SecOps que busca logs do Zscaler CASB e grava logs no Google SecOps.

  • Google SecOps: retém e analisa os registros.

Um rótulo de transferência identifica o analisador que normaliza os dados de registro brutos no formato UDM estruturado. Este documento se aplica especificamente ao analisador associado ao rótulo de transferência ZSCALER_CASB.

Antes de começar

  • Confira se você tem acesso ao console do Zscaler Internet Access. Para mais informações, consulte Ajuda do ZIA para acesso seguro à Internet e ao SaaS.
  • Verifique se você está usando a versão 1.0 ou 2.0 do Zscaler CASB.
  • Verifique se todos os sistemas na arquitetura de implantação estão configurados com o fuso horário UTC.
  • Verifique se você tem a chave de API necessária para concluir a configuração do feed no Google SecOps. Para mais informações, consulte Como configurar chaves de API.

Configurar um feed de ingestão no Google SecOps para processar os registros do Zscaler CASB

  1. Acesse Configurações > Feeds.
  2. Clique em Adicionar novo.
  3. No campo Nome do feed, insira um nome para o feed (por exemplo, Zscaler CASB Logs).
  4. Selecione Webhook como o Tipo de origem.
  5. Selecione Zscaler CASB como o Tipo de registro.
  6. Clique em Próxima.
  7. Opcional: insira valores para os seguintes parâmetros de entrada:
    1. Delimitador de divisão: o caractere usado para separar as linhas de registro. Deixe em branco se nenhum delimitador for usado.
    2. Namespace do recurso: o namespace do recurso.
    3. Rótulos de ingestão: o rótulo a ser aplicado aos eventos desse feed.
  8. Clique em Próxima.
  9. Revise a configuração do novo feed e clique em Enviar.
  10. Clique em Generate Secret Key para gerar uma chave secreta para autenticar esse feed.

Configurar o CASB do Zscaler

  1. No console de acesso à Internet do Zscaler, clique em Administration > Nanolog Streaming Service > Cloud NSS Feeds > Add Cloud NSS Feed.
  2. Na janela Adicionar feed do NSS do Cloud, insira os detalhes.
  3. No campo Nome do feed, insira um nome exclusivo.
  4. Selecione Zscaler for Web em Tipo de NSS.
  5. Na lista Status, selecione um status para ativar ou desativar o feed do NSS.
  6. Deixe a taxa do SIEM como Ilimitado, a menos que você precise limitar o fluxo de saída devido a restrições de licenciamento ou outras.
  7. Na lista Tipo de SIEM, selecione Outro.
  8. Na lista Autenticação OAuth 2.0, selecione Desativada.
  9. No campo Tamanho máximo do lote, insira um limite de tamanho para um payload de solicitação HTTP individual para a prática recomendada do SIEM. Por exemplo, 512 KB.

  10. No campo URL da API, insira o URL HTTPS do endpoint de API Chronicle usando o seguinte formato:

      https://<CHRONICLE_REGION>-chronicle.googleapis.com/v1alpha/projects/<GOOGLE_PROJECT_NUMBER>/locations/<LOCATION>/instances/<CUSTOMER_ID>/feeds/<FEED_ID>:importPushLogs
    • CHRONICLE_REGION: região em que a instância do Google SecOps está hospedada. Por exemplo, US.
    • GOOGLE_PROJECT_NUMBER: o número do seu projeto BYOP. Receba isso do C4.
    • LOCATION: região do Chronicle (Google SecOps), igual a CHRONICLE_REGION. Por exemplo, US.
    • CUSTOMER_ID: seu ID de cliente do Google SecOps. Extrair do C4.
    • FEED_ID: ID do feed de webhook recém-criado (exibido na interface do feed).

    • URL da API de exemplo:

      https://us-chronicle.googleapis.com/v1alpha/projects/12345678910/locations/US/instances/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/feeds/yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy:importPushLogs

  11. Clique em Adicionar cabeçalho HTTP e adicione cabeçalhos HTTP no seguinte formato:

    • Header 1: Chave1:X-goog-api-key e Valor1:chave de API gerada com as credenciais da API do Google Cloud BYOP.
    • Header 2: Key2:X-Webhook-Access-Key e Value2:chave secreta da API gerada em "CHAVE SECRETA" do webhook.

  12. Na lista Tipos de registro, selecione Segurança do SaaS ou Atividade de segurança do SaaS.

  13. Na lista Tipo de saída do feed, selecione JSON.

  14. Defina Caracter de escape do feed como , \ ".

  15. Na lista Tipo de saída do feed, selecione Personalizado para adicionar um novo campo ao Formato de saída do feed.

  16. Copie e cole o Formato de saída do feed e adicione novos campos, conforme necessário. Confira se os nomes das chaves correspondem aos nomes dos campos.

  17. Confira a seguir os formatos de saída de feed padrão:

    • Segurança de SaaS
    \{ "sourcetype" : "zscalernss-casb", "event" :\{"datetime":"%s{time}","recordid":"%d{recordid}","company":"%s{company}","tenant":"%s{tenant}","login":"%s{user}","dept":"%s{department}","applicationname":"%s{applicationname}","filename":"%s{filename}","filesource":"%s{filesource}","filemd5":"%s{filemd5}","threatname":"%s{threatname}","policy":"%s{policy}","dlpdictnames":"%s{dlpdictnames}","dlpdictcount":"%s{dlpdictcount}","dlpenginenames":"%s{dlpenginenames}","fullurl":"%s{fullurl}","lastmodtime":"%s{lastmodtime}","filescantimems":"%d{filescantimems}","filedownloadtimems":"%d{filedownloadtimems}"\}\}
    • Atividade de segurança de SaaS
    \{ "sourcetype" : "zscalernss-casb", "event" :\{"login":"%s{username}","tenant":"%s{tenant}","object_type":"%d{objtype1}","applicationname":"%s{appname}","object_name_1":"%s{objnames1}","object_name_2":"%s{objnames2}"\}\}

  18. Na lista Fuso horário, selecione o fuso horário para o campo Hora no arquivo de saída. Por padrão, o fuso horário é definido como o da sua organização.

  19. Revise as configurações definidas.

  20. Clique em Salvar para testar a conectividade. Se a conexão for bem-sucedida, uma marca de seleção verde acompanhada da mensagem Test Connectivity Successful: OK (200) vai aparecer.

Para mais informações sobre os feeds do Google SecOps, consulte a documentação sobre feeds do Google SecOps. Para informações sobre os requisitos de cada tipo de feed, consulte Configuração de feed por tipo.

Se você tiver problemas ao criar feeds, entre em contato com o suporte do Google SecOps.

Referência do mapeamento de campo

Referência de mapeamento de campo: ZSCALER_CASB

A tabela a seguir lista os campos de registro do tipo ZSCALER_CASB e os campos correspondentes do UDM.

Log field UDM mapping Logic
sourcetype security_result.detection_fields[sourcetype]
objnames2 about.resource.name
object_name_2 about.resource.name
objtypename2 about.resource.resource_subtype
externalownername additional.fields[externalownername]
act_cnt additional.fields[act_cnt]
attchcomponentfiletypes additional.fields[attchcomponentfiletypes]
channel_name additional.fields[channel_name]
collabscope additional.fields[collabscope]
day additional.fields[day]
dd additional.fields[dd]
dlpdictcount security_result.detection_fields[dlpdictcount] If the dlpdictcount log field value is not empty and the dlpdictcount log field value is not equal to None, then the dlpdictcount log field is mapped to the security_result.detection_fields.dlpdictcount UDM field.
dlpenginenames security_result.detection_fields[dlpenginenames] If the dlpenginenames log field value is not empty and the dlpenginenames log field value is not equal to None, then the dlpenginenames log field is mapped to the security_result.detection_fields.dlpenginenames UDM field.
epochlastmodtime additional.fields[epochlastmodtime]
extcollabnames additional.fields[extcollabnames]
extownername additional.fields[extownername]
file_msg_id additional.fields[file_msg_id]
fileid additional.fields[fileid]
filescantimems additional.fields[filescantimems]
filetypecategory additional.fields[filetypecategory]
hh additional.fields[hh]
messageid additional.fields[messageid]
mm additional.fields[mm]
mon additional.fields[mon]
msgsize additional.fields[msgsize]
mth additional.fields[mth]
num_ext_recpts additional.fields[num_ext_recpts]
num_int_recpts additional.fields[num_int_recpts]
numcollab additional.fields[numcollab]
rtime additional.fields[rtime]
ss additional.fields[ss]
suburl additional.fields[suburl]
tenant additional.fields[tenant]
tz additional.fields[tz]
upload_doctypename additional.fields[upload_doctypename]
yyyy additional.fields[yyyy]
collabnames additional.fields[collabnames]
companyid additional.fields[companyid]
component additional.fields[component]
intcollabnames additional.fields[intcollabnames] If intcollabnames log field value does not match the regular expression pattern None then, for index in intcollabnames, the index is mapped to the additional.fields.value.list_value UDM field.
internal_collabnames additional.fields[internal_collabnames]
external_collabnames additional.fields[externalcollabnames]
num_external_collab additional.fields[num_external_collab]
num_internal_collab additional.fields[num_internal_collab]
repochtime additional.fields[repochtime]
eventtime metadata.event_timestamp If the eventtime log field value is not empty, then the eventtime log field is mapped to the metadata.event_timestamp UDM field.
epochtime metadata.event_timestamp If the epochtime log field value is not empty, then the epochtime log field is mapped to the metadata.event_timestamp UDM field.
time metadata.event_timestamp If the time log field value is not empty, then the time log field is mapped to the metadata.event_timestamp UDM field.
datetime metadata.event_timestamp If the datetime log field value is not empty, then the datetime log field is mapped to the metadata.event_timestamp UDM field.
metadata.event_type The metadata.event_type UDM field is set to USER_UNCATEGORIZED.
act_type_name metadata.product_event_type
recordid metadata.product_log_id
metadata.product_name The metadata.product_name UDM field is set to CASB.
metadata.vendor_name The metadata.vendor_name UDM field is set to Zscaler.
sender network.email.from If the sender log field value matches the regular expression pattern (^.*@.*$), then the sender log field is mapped to the network.email.from UDM field.
extrecptnames network.email.to For index in extrecptnames, the index is mapped to the network.email.to UDM field.
internal_recptnames network.email.to For index in internal_recptnames, the index is mapped to the network.email.to UDM field.
external_recptnames network.email.to For index in external_recptnames, the index is mapped to the network.email.to UDM field.
intrecptnames network.email.to For index in intrecptnames, the index is mapped to the network.email.to UDM field.
applicationname principal.application If the applicationname log field value is not empty, then the applicationname log field is mapped to the principal.application UDM field.

Else, the appname log field is mapped to the principal.application UDM field.
src_ip principal.ip
fullurl principal.url If the fullurl log field is not empty and the fullurl log field value is not equal to Unknown URL, then the fullurl log field is mapped to the principal.url UDM field.
is_admin_act principal.user.attribute.labels[is_admin_act]
principal.user.attribute.roles.type If the is_admin_act log field value is equal to 1, then the principal.user.attribute.roles.type UDM field is set to ADMINISTRATOR.
company principal.user.company_name
department principal.user.department
dept principal.user.department
user principal.user.email_addresses If the user log field value matches the regular expression pattern (^.*@.*$), then the user log field is mapped to the principal.user.email_addresses UDM field.
username principal.user.email_addresses If the username log field value matches the regular expression pattern (^.*@.*$), then the username log field is mapped to the principal.user.email_addresses UDM field.
owner principal.user.email_addresses If the owner log field value matches the regular expression pattern (^.*@.*$), then the owner log field is mapped to the principal.user.email_addresses UDM field.
login principal.user.email_addresses If the login log field value matches the regular expression pattern (^.*@.*$), then the login log field is mapped to the principal.user.email_addresses UDM field.
login principal.user.userid If the login log field value does not match the regular expression pattern ^.+@.+$, then the login log field is mapped to the principal.user.userid UDM field.
malware security_result.associations.name
security_result.associations.type If the malware log field value is not empty, then the security_result.associations.type UDM field is set to MALWARE.
dlpdictnames security_result.detection_fields[dlpdictnames]
dlpidentifier security_result.detection_fields[dlpidentifier]
filedownloadtimems additional.fields[filedownloadtimems]
malwareclass security_result.detection_fields[malwareclass]
msgid security_result.detection_fields[msgid]
oattchcomponentfilenames security_result.detection_fields[oattchcomponentfilenames]
obucketname security_result.detection_fields[obucketname]
obucketowner security_result.detection_fields[obucketowner]
ochannel_name security_result.detection_fields[ochannel_name]
ocollabnames security_result.detection_fields[ocollabnames]
odlpdictnames security_result.detection_fields[odlpdictnames]
odlpenginenames security_result.detection_fields[odlpenginenames]
oextcollabnames security_result.detection_fields[oextcollabnames]
oexternal_collabnames security_result.detection_fields[oexternal_collabnames]
oexternal_recptnames security_result.detection_fields[oexternal_recptnames]
oexternalownername security_result.detection_fields[oexternalownername]
oextownername security_result.detection_fields[oextownername]
oextrecptnames security_result.detection_fields[oextrecptnames]
ofile_msg_id security_result.detection_fields[ofile_msg_id]
ofileid security_result.detection_fields[ofileid]
ofullurl security_result.detection_fields[ofullurl]
ohostname security_result.detection_fields[ohostname]
ointcollabnames security_result.detection_fields[ointcollabnames]
ointernal_collabnames security_result.detection_fields[ointernal_collabnames]
ointernal_recptnames security_result.detection_fields[ointernal_recptnames]
ointrecptnames security_result.detection_fields[ointrecptnames]
omessageid security_result.detection_fields[omessageid]
omsgid security_result.detection_fields[omsgid]
oowner security_result.detection_fields[oowner]
orulelabel security_result.detection_fields[orulelabel]
osender security_result.detection_fields[osender]
osharedchannel_hostname security_result.detection_fields[osharedchannel_hostname]
otenant security_result.detection_fields[otenant]
ouser security_result.detection_fields[ouser]
any_incident security_result.detection_fields[any_incident]
is_inbound security_result.detection_fields[is_inbound]
policy security_result.rule_labels[policy]
ruletype security_result.rule_labels[ruletype]
rulelabel security_result.rule_name
security_result.severity If the severity log field value is equal to High, then the security_result.severity UDM field is set to HIGH.

Else, if the severity log field value is equal to Medium, then the security_result.severity UDM field is set to MEDIUM.

Else, if the severity log field value is equal to Low, then the security_result.sevrity UDM field is set to LOW.

Else, if the severity log field value is equal to Information, then the security_result.severity UDM field is set to INFORMATIONAL.
threatname security_result.threat_name If the threatname log field value is not empty and the dlpdictcount log field value is not equal to None, then the threatname log field is mapped to the security_result.threat_name UDM field.
filesource target.file.full_path If the filesource log field value is not empty, then the filesource log field is mapped to the target.file.full_path UDM field.
filepath target.file.full_path If the filesource log field value is not empty, then the filesource log field is mapped to the target.file.full_path UDM field.

Else if the filepath log field value is not empty, then the filepath log field is mapped to the target.file.full_path UDM field.
lastmodtime target.file.last_modification_time If the lastmodtime log field value is not empty, then the lastmodtime log field is mapped to the target.file.last_modification_time UDM field.
file_msg_mod_time target.file.last_modification_time If the lastmodtime log field value is not empty, then the lastmodtime log field is mapped to the target.file.last_modification_time UDM field.

Else if the file_msg_mod_time log field value is not empty, then the file_msg_mod_time log field is mapped to the target.file.fullpath UDM field.
filemd5 target.file.md5 If the filemd5 log field value is not equal to None and the filemd5 log field value matches the regular expression pattern ^[a-fA-F0-9]{32}$, then the filemd5 log field is mapped to the target.file.md5 UDM field.

Else, if the attchcomponentmd5s log field value matches the regular expression pattern ^[a-fA-F0-9]{32}$, then the attchcomponentmd5s log field is mapped to the target.file.md5 UDM field.
filetypename target.file.mime_type
filename target.file.names
attchcomponentfilenames target.file.names
sha target.file.sha256
attchcomponentfilesizes target.file.size If the attchcomponentfilesizes log field value is not empty, then the attchcomponentfilesizes log field is mapped to the target.file.size UDM field.
filesize target.file.size If the attchcomponentfilesizes log field value is not empty, then the attchcomponentfilesizes log field is mapped to the target.file.size UDM field.

Else if the filesize log field value is not empty, then the filesize log field is mapped to the target.file.size UDM field.
sharedchannel_hostname target.hostname If the hostname log field value is not empty, then the hostname log field is mapped to the target.hostname UDM field.

Else if the sharedchannel_hostname log field value is not empty, then the sharedchannel_hostname log field is mapped to the target.hostname UDM field.
hostname target.hostname If the hostname log field value is not empty, then the hostname log field is mapped to the target.hostname UDM field.
datacentercity target.location.city
datacentercountry target.location.country_or_region
datacenter target.location.name
bucketowner target.resource.attribute.labels[bucketowner]
projectname target.resource.attribute.labels[projectname]
bucketname target.resource.name If the bucketname log field value is not empty, then the bucketname log field is mapped to the target.resource.name UDM field.
objnames1 target.resource.name If the objnames1 log field value is not empty, then the objnames1 log field is mapped to the target.resource.name UDM field.
objectname target.resource.name If the objectname log field value is not empty, then the objectname log field is mapped to the target.resource.name UDM field.
reponame target.resource.name If the reponame log field value is not empty, then the reponame log field is mapped to the target.resource.name UDM field.
object_name_1 target.resource.name If the object_name_1 log field value is not empty, then the object_name_1 log field is mapped to the target.resource.name UDM field.
bucketid target.resource.product_object_id
objtypename1 target.resource.resource_subtype If the objtypename1 log field value is not empty, then the objtypename1 log field is mapped to the target.resource.resource_subtype UDM field.
objecttype target.resource.resource_subtype If the objecttype log field value is not empty, then the objecttype log field is mapped to the target.resource.resource_subtype UDM field.
object_type target.resource.resource_subtype
target.resource.resource_type If the bucketname log field value is not empty, then the target.resource.resource_type UDM field is set to STORAGE_BUCKET.

If the reponame log field value is not empty, then the target.resource.resource_type UDM field is set to REPOSITORY.

A seguir

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