SPL and Efficient Searching

SPLK-5001 · 60 questions

• A county SOC needs a 24-hour count of failed civic VPN logons by user. The Authentication data model is accelerated. Which SPL family should the analyst use?
• The city just onboarded a new PSAP CAD sourcetype. An analyst runs tstats on the Authentication data model and sees none of the new events. Why?
• A huge county index would be too expensive if tstats fell back to raw events. The analyst only wants summary data. What should they set?
• After a tstats count of the treasurer's failed logons, the analyst needs a trend table by hour. What is the next SPL step?
• An analyst must reconstruct a clerk session: civic VPN logon, then file-share access, then rare egress. The events share user and occur within a bounded pause. Which command should glue them into one session?
• The analyst only needs each user's first civic VPN time and last file-share access, not a full multi-event session. Why is stats first() last() better than transaction?
• An analyst is investigating a comptroller mailbox-rule creation followed by the first outbound BEC-style send. How should transaction be bounded?
• A help-desk account shows a burst of failed civic logons and later a success. Which SPL pair shows whether brute force later succeeded?
• A suspect IP is talking to civic hosts in NetworkTraffic. The analyst needs the most recent dest that src reached, without building a full transaction. What should they use?
• To estimate dwell on a utilities risk object, the analyst needs when activity began. What timestamp should they take from the contributing events?
• A custom parking-meter syslog buries the meter ID in the raw message. The analyst needs that ID as a field for later stats. Which command extracts it in the search?
• The parking-meter ID extraction will be needed every night, not just this incident. When should the analyst stay with search-time rex versus a durable extraction?
• A parks watering-hole URL is already in the CIM url field. The analyst needs the second-level domain. How should they run rex?
• A clinic file-share investigation has mixed action values (allow versus allowed) and needs a flag when bytesout exceeds 100000000. Which command calculates those analysis fields?
• During an ad-hoc hunt, the analyst has civic failed-logon counts per user and wants low, med, and high buckets. Which eval form classifies those results?
• A public-health clinic EDR stores file hashes in uppercase, but the county ISAC intel lookup table is lowercase, so known malware hashes return no matches. What should the analyst do before the lookup?
• Wastewater SCADA events include srcip, destip, and c2ip. The analyst wants to flag which of those addresses are RFC1918 without writing three nearly identical eval statements. Which SPL approach fits?
• A library catalog-PC malware event exposes several hash fields named filehash, filehashmd5, and filehashsha256. How can the analyst lowercase every filehash field in one pass for intel matching?
• During incident response on a city workstation, the analyst has src but needs the asset owner, priority, and business unit from the municipal asset table — the same context Asset and Identity would add in Enterprise Security. Which SPL command should they use?
• A transit SOC analyst has a rare destination domain and a file hash from last night's parking-meter malware. What is the right way to see whether those values appear on the ISAC indicator list already loaded as a lookup?
• A court-system notable already has a CIM user field. The analyst runs a sparse HR lookup that only matches some clerks. Which lookup writing option preserves the original user on non-matches instead of wiping it?
• A school-district analyst needs to prove a new parent-portal user lookup returns the expected department before the next phishing wave. There is no live attack to search. Which command creates a dummy row so the lookup can be tested?
• Housing-authority engineers added a ransomware-hash intel table. The analyst must confirm lookups hit before any correlation search uses that table in production. How can they test it without querying live indexes?
• The elections office wants failed logons on high-priority voter-file hosts investigated first. Which SPL sequence best prioritizes that hunt?
• A sheriff's-office help-desk ticket mentions a password reset after a caller impersonated a captain. The ticket ID sits only in the raw help-desk message, and the reset event follows. How should the analyst reconstruct where the reset came from?
• A parks-department intern runs makeresults expecting to see last night's irrigation-controller syslog. The search returns one empty-looking row and no device logs. What is the correct explanation?
• A permitting-office analyst needs to attach DHCP hostnames to firewall src addresses. A teammate suggests using rex to join the two datasets. What should the analyst do instead?
• A fire/EMS analyst maps SPL jobs to commands: aggregate accelerated models, glue a time-bounded session, extract a buried field, calculate a flag, enrich from a table, or test without indexes. They need to enrich a rare dest IP with station owner and priority from the municipal asset CSV. Which command matches that job?
• A 911/PSAP CAD outage started in the last hour. An analyst's first investigation search uses All Time on the CAD index. What is the most important efficient-search fix?
• A city SOC is hunting last hour's firewall denies for the tax portal. Which initial filter follows Splunk efficient-search practice?
• A sheriff's-office analyst searches high-volume authentication logs with admin to find privileged civic accounts. Why is that pattern a problem?
• County Windows failed-logon volume is huge, and the Authentication data model is healthy and accelerated. What is the efficient default for counting EventCode 4625-style failures?
• After filtering assessor-office authentication events, later commands only need src, user, and action. How should the analyst reduce search cost?
• A municipal hunt is streaming every clerk-PC endpoint event into the search UI before anyone counts users. What efficient-search change should come first?
• A city hunt for hosts that talked to C2 uses a subsearch that returns an entire day's destination IPs and then hits subsearch limits. What should the analyst do instead?
• An analyst runs transaction across a week of proxy logs for every city employee to find rare destinations. Why is that an efficiency anti-pattern, and what is the better pattern?
• A wastewater hunt already knows the CIM fields it needs and can use tstats on a healthy model. The analyst leaves the search in verbose mode on huge indexes. What should they change?
• Transit bus-CAD events already have a CIM src field from the add-on. An analyst still runs rex on millions of hot events to extract the same source address. What is the efficient practice?
• A library malware hunt looks for a rare mutex string. The analyst uses a loose substring with wildcards and the search scans far more events than expected. What is the efficient way to seek that indicator?
• A county IR hunt and a heavy weekly compliance report are competing with 911 monitoring searches on the shared search head. What efficient-search courtesy should the analyst apply?
• A city SOC analyst needs a running count of failed VPN logons per clerk identity for the last hour, but the draft search starts with index= | streamstats count by user. What should the analyst change first?
• Transit SOC needs the top talkers on the bus-yard network for the last 15 minutes, and an intern starts exporting raw NetFlow events to Excel. What should the analyst do instead?
• The mayor's office dashboard of 911 SIP error counts refreshes every five minutes and currently runs a raw index search on each refresh. What should the city SOC recommend?
• A PSAP dashboard counts 911 SIP errors in one-minute buckets, and the current minute always looks artificially low while events are still arriving. What should the analyst change?
• Water-plant SOC already knows the jump-host name for a hunt, but the draft search filters only on a search-time field after scanning the whole index. What should the analyst add to the first clause?
• A county hunt for unusual library-kiosk logons is slow because the search runs a lookup and several eval transforms before any index filter. Which order should the analyst apply?
• A new courts-SOC analyst thinks reusable security SPL exists only in the Search app. Where else in Enterprise Security should they look?
• A sheriff-jail SOC analyst has a new case that looks like last week's notable. What is a legitimate way to start the investigation SPL?
• A city endpoint team just onboarded Sysmon and asks the SOC for hunts that actually use that sourcetype. Where should the analyst look first?
• A county analyst found a relevant use case in Splunk Security Essentials but is about to write new regex for the same behavior. What should they do instead?
• The public-health SOC needs an official Splunk how-to for investigating ransomware, including example searches. Which resource is that library?
• A wastewater analyst is about to write a brand-new search for historian setpoint changes. What should they do first?
• A parks-department SOC lead needs analysts to keep Enterprise Security, Splunk Security Essentials, and Splunk Lantern straight. Which assignment is correct?
• An elections-SOC intern bookmarks a random blog of secret SPL dumps as the team's search library. Which sources should the analyst treat as the Domain 5.3 SPL libraries instead?
• The ES Network Security Domain dashboard for the fire and EMS network is empty. Which SPL-adjacent resource should the analyst use to learn why the search has nothing to run on?
• Housing-authority SOC is investigating suspected ransomware on file servers. How should the analyst use a Splunk Lantern ransomware-investigation article?
• A permitting-desk analyst rewrites CIM Authentication filters by hand because using ES-shipped macros feels like cheating. What should the lead tell them?
• Library SOC bookmarked a high-value hunt in Splunk Security Essentials and wants it to become an ES detection. What should the analyst know about that path?
• Library SOC is onboarding a junior analyst. Which enablement pack should the lead hand them first?
• A vendor gist contradicts Enterprise Security, Splunk Security Essentials, Splunk Lantern, and Splunk Docs on how a civic Authentication search should be written. What is the source of truth?