Mengumpulkan log Zscaler CASB

Dokumen ini menjelaskan cara mengekspor log Zscaler CASB dengan menyiapkan feed Google Security Operations dan memetakan kolom log ke Unified Data Model (UDM).

Untuk mengetahui informasi selengkapnya, lihat Ringkasan penyerapan data ke Google SecOps.

Deployment standar terdiri dari Zscaler CASB dan feed Webhook Google SecOps yang dikonfigurasi untuk mengirim log ke Google SecOps. Namun, detail deployment dapat berbeda menurut pelanggan dan mungkin lebih kompleks.

Deployment berisi komponen berikut:

  • Zscaler CASB: Platform tempat Anda mengumpulkan log.

  • Feed Google SecOps: Feed Google SecOps yang mengambil log dari Zscaler CASB dan menulis log ke Google SecOps.

  • Google SecOps: Mempertahankan dan menganalisis log.

Label penyerapan mengidentifikasi parser yang menormalisasi data log mentah ke dalam format UDM terstruktur. Dokumen ini berlaku khusus untuk parser yang terkait dengan label transfer ZSCALER_CASB.

Sebelum memulai

  • Pastikan Anda memiliki akses ke konsol Akses Internet Zscaler. Untuk informasi selengkapnya, lihat Bantuan ZIA Akses Internet dan SaaS yang Aman.
  • Pastikan Anda menggunakan Zscaler CASB versi 1.0 atau 2.0.
  • Pastikan semua sistem dalam arsitektur deployment dikonfigurasi dengan zona waktu UTC.
  • Pastikan Anda memiliki kunci API yang diperlukan untuk menyelesaikan penyiapan feed di Google SecOps. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan kunci API.

Menyiapkan feed transfer di Google SecOps untuk menyerap log Zscaler CASB

  1. Buka Setelan > Feed.
  2. Klik Tambahkan baru.
  3. Di kolom Nama feed, masukkan nama untuk feed (misalnya, Zscaler CASB Logs).
  4. Pilih Webhook sebagai Jenis Sumber.
  5. Pilih Zscaler CASB sebagai Log Type.
  6. Klik Berikutnya.
  7. Opsional: Masukkan nilai untuk parameter input berikut:
    1. Pemisah pemisahan: karakter yang digunakan untuk memisahkan baris log. Biarkan kosong jika tidak ada pembatas yang digunakan.
    2. Namespace aset: namespace aset.
    3. Label penyerapan: label yang akan diterapkan ke peristiwa dari feed ini.
  8. Klik Berikutnya.
  9. Tinjau konfigurasi feed baru Anda, lalu klik Kirim.
  10. Klik Buat Kunci Rahasia untuk membuat kunci rahasia guna mengautentikasi feed ini.

Menyiapkan CASB Zscaler

  1. Di Konsol Akses Internet Zscaler, klik Administration > Nanolog Streaming Service > Cloud NSS Feeds > Add Cloud NSS Feed.
  2. Di jendela Add Cloud NSS Feed, masukkan detailnya.
  3. Di kolom Feed Name, masukkan nama unik untuk feed.
  4. Pilih Zscaler for Web di NSS Type.
  5. Dalam daftar Status, pilih status untuk mengaktifkan atau menonaktifkan feed NSS.
  6. Biarkan Kecepatan SIEM sebagai Tidak terbatas, kecuali jika Anda perlu membatasi aliran output karena lisensi atau batasan lainnya.
  7. Dalam daftar Jenis SIEM, pilih Lainnya.
  8. Di daftar OAuth 2.0 Authentication, pilih Disabled.
  9. Di kolom Max Batch Size, masukkan batas ukuran untuk setiap payload permintaan HTTP ke praktik terbaik SIEM; misalnya, 512 KB.

  10. Di kolom API URL, masukkan URL HTTPS endpoint Chronicle API menggunakan format berikut:

      https://<CHRONICLE_REGION>-chronicle.googleapis.com/v1alpha/projects/<GOOGLE_PROJECT_NUMBER>/locations/<LOCATION>/instances/<CUSTOMER_ID>/feeds/<FEED_ID>:importPushLogs
    • CHRONICLE_REGION: Region tempat instance Google SecOps Anda dihosting. Contoh, US.
    • GOOGLE_PROJECT_NUMBER: Nomor project BYOP Anda. Dapatkan ini dari C4.
    • LOCATION: Region Chronicle (Google SecOps) (sama dengan CHRONICLE_REGION). Misalnya, US.
    • CUSTOMER_ID: ID pelanggan Google SecOps Anda. Dapatkan dari C4.
    • FEED_ID: ID feed webhook yang baru dibuat (ditampilkan di UI Feed).

    • Contoh URL API:

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

  11. Klik Tambahkan Header HTTP, lalu tambahkan header HTTP dalam format berikut:

    • Header 1: Key1: X-goog-api-key dan Value1: Kunci API yang dihasilkan dari Google Cloud Kredensial API BYOP.
    • Header 2: Key2: X-Webhook-Access-Key dan Value2: Kunci rahasia API yang dihasilkan di "SECRET KEY" webhook.

  12. Di daftar Jenis Log, pilih Keamanan SaaS atau Aktivitas Keamanan SaaS.

  13. Di daftar Feed Output Type, pilih JSON.

  14. Tetapkan Feed Escape Character ke , \ ".

  15. Di daftar Feed Output Type, pilih Custom untuk menambahkan kolom baru ke Feed Output Format.

  16. Salin dan tempel Format Output Feed, lalu tambahkan kolom baru, sesuai kebutuhan. Pastikan nama kunci cocok dengan nama kolom yang sebenarnya.

  17. Berikut adalah Format Output Feed default:

    • Keamanan 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}"\}\}
    • Aktivitas Keamanan 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. Dari daftar Timezone, pilih zona waktu untuk kolom Time dalam file output. Secara default, zona waktu ditetapkan ke zona waktu organisasi Anda.

  19. Tinjau setelan yang dikonfigurasi.

  20. Klik Simpan untuk menguji konektivitas. Jika koneksi berhasil, tanda centang hijau yang disertai pesan Uji Konektivitas Berhasil: OK (200) akan muncul.

Untuk informasi selengkapnya tentang feed Google SecOps, lihat dokumentasi feed Google SecOps. Untuk mengetahui informasi tentang persyaratan untuk setiap jenis feed, lihat Konfigurasi feed menurut jenis.

Jika Anda mengalami masalah saat membuat feed, hubungi dukungan Google SecOps.

Referensi pemetaan kolom

Referensi pemetaan kolom: ZSCALER_CASB

Tabel berikut mencantumkan kolom log dari jenis log ZSCALER_CASB dan kolom UDM yang sesuai.

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.

Langkah berikutnya

Perlu bantuan lain? Dapatkan jawaban dari anggota Komunitas dan profesional Google SecOps.