Recolha registos do CASB do Zscaler

Este documento descreve como pode exportar registos do Zscaler CASB configurando um feed do Google Security Operations e mapeando os campos de registo para o modelo de dados unificado (UDM).

Para mais informações, consulte o artigo Vista geral da ingestão de dados no Google SecOps.

Uma implementação típica consiste no Zscaler CASB e num feed de webhook do Google SecOps configurado para enviar registos para o Google SecOps. No entanto, os detalhes da implementação podem variar consoante o cliente e podem ser mais complexos.

A implementação contém os seguintes componentes:

  • Zscaler CASB: a plataforma a partir da qual recolhe registos.

  • Feed do Google SecOps: o feed do Google SecOps que obtém registos do Zscaler CASB e escreve registos no Google SecOps.

  • Google SecOps: retém e analisa os registos.

Uma etiqueta de carregamento identifica o analisador que normaliza os dados de registo não processados para o formato UDM estruturado. Este documento aplica-se especificamente ao analisador associado à etiqueta de carregamento ZSCALER_CASB.

Antes de começar

  • Certifique-se de que tem acesso à consola do Zscaler Internet Access. Para mais informações, consulte o artigo Acesso seguro à Internet e ao SaaS: ajuda do ZIA.
  • Certifique-se de que está a usar a versão 1.0 ou 2.0 do Zscaler CASB.
  • Certifique-se de que todos os sistemas na arquitetura de implementação estão configurados com o fuso horário UTC.
  • Certifique-se de que tem a chave da API necessária para concluir a configuração do feed no Google SecOps. Para mais informações, consulte o artigo Configurar chaves de API.

Configure feeds

Para configurar este tipo de registo, siga estes passos:

  1. Aceda a Definições do SIEM > Feeds.
  2. Clique em Adicionar novo feed.
  3. Clique no pacote de feeds Zscaler.
  4. Localize o tipo de registo necessário e clique em Adicionar novo feed.

  5. Introduza valores para os seguintes parâmetros de entrada:

    • Tipo de origem: webhook (recomendado)
    • Delimitador de divisão: o caráter usado para separar linhas de registos. Deixe em branco se não for usado nenhum delimitador.

    Opções avançadas

    • Nome do feed: um valor pré-preenchido que identifica o feed.
    • Espaço de nomes do recurso: espaço de nomes associado ao feed.
    • Etiquetas de carregamento: etiquetas aplicadas a todos os eventos deste feed.

  6. Clique em Criar feed.

Para mais informações sobre a configuração de vários feeds para diferentes tipos de registos nesta família de produtos, consulte o artigo Configure feeds por produto.

Configure o Zscaler CASB

  1. Na consola do Zscaler Internet Access, clique em Administração > Serviço de streaming de nanologs > Feeds NSS na nuvem > Adicionar feed NSS na nuvem.
  2. Na janela Adicionar feed do NSS na nuvem, introduza os detalhes.
  3. No campo Nome do feed, introduza um nome exclusivo para o feed.
  4. Selecione Zscaler for Web em Tipo de NSS.
  5. Na lista Estado, selecione um estado para ativar ou desativar o feed de NSS.
  6. Deixe a taxa de SIEM como ilimitada, a menos que precise de limitar a stream de saída devido a licenciamento ou outras restrições.
  7. Na lista Tipo de SIEM, selecione Outro.
  8. Na lista Autenticação OAuth 2.0, selecione Desativada.
  9. No campo Tamanho máximo do lote, introduza um limite de tamanho para uma carga útil de pedido HTTP individual de acordo com a prática recomendada do SIEM; por exemplo, 512 KB.

  10. No campo URL da API, introduza o URL HTTPS do ponto final da API Chronicle no 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 onde a sua instância do Google SecOps está alojada. Por exemplo, US.
    • GOOGLE_PROJECT_NUMBER: o número do seu projeto BYOP. Obtenha-o a partir do C4.
    • LOCATION: região do Chronicle (Google SecOps) (igual a CHRONICLE_REGION). Por exemplo, US.
    • CUSTOMER_ID: o seu ID de cliente do Google SecOps. Obtenha a partir de C4.
    • FEED_ID: ID do feed de webhook recém-criado (apresentado na IU de feeds).

    • 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, de seguida, adicione cabeçalhos HTTP no seguinte formato:

    • Header 1: Key1: X-goog-api-key e Value1: chave da API gerada a partir das credenciais da API do Google Cloud BYOP.
    • Header 2: Key2: X-Webhook-Access-Key e Value2: chave secreta da API gerada na "CHAVE SECRETA" do webhook.

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

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

  14. Defina o caráter 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, em seguida, adicione novos campos, conforme necessário. Certifique-se de que os nomes das chaves correspondem aos nomes dos campos reais.

  17. Seguem-se os formatos de saída do feed predefinidos:

    • 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 do 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 ficheiro de saída. Por predefinição, o fuso horário é definido como o fuso horário da sua organização.

  19. Reveja as definições configuradas.

  20. Clique em Guardar para testar a conetividade. Se a ligação for bem-sucedida, é apresentada uma marca de verificação verde acompanhada da mensagem Test Connectivity Successful: OK (200).

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

Se tiver problemas ao criar feeds, contacte o apoio técnico da Google SecOps.

Referência de mapeamento de campos

Referência de mapeamento de campos: ZSCALER_CASB

A tabela seguinte apresenta os campos de registo do ZSCALER_CASB tipo de registo e os respetivos campos 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.

O que se segue?

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