CS0-003 Dumps
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CS0-003 Actual Questions
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CompTIA Cybersecurity Analyst (CySA+)
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An organization has activated the CSIRT. A security analyst believes a single virtual server was compromised and immediately isolated from the network.
Which of the following should the CSIRT conduct next?
Take a snapshot of the compromised server and verify its integrity
Restore the affected server to remove any malware
Contact the appropriate government agency to investigate
ation:
next action that the CSIRT should conduct after isolating the compromised server from the network is to ta snapshot of the compromised server and verify its integrity. Taking a snapshot of the compromised server invo
an exact copy or image of the serverâs data and state at a specific point in time. Verifying its integrity ensuring that the snapshot has not been altered, corrupted, or tampered with during or after its creation a snapshot and verifying its integrity can help preserve and protect any evidence or information related
as well as prevent any tampering, contamination, or destruction of evidence.
an incident, an analyst needs to acquire evidence for later investigation.
f the following must be collected first in a computer system, related to its volatility level? contents
kup data porary files ning processes
ation:
st volatile type of evidence that must be collected first in a computer system is running processes. Runn
Research the malware strain to perform attribution
Explan
The ke a
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involves .
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The mo ing
processes are programs or applications that are currently executing on a computer system and using its resources, such as memory, CPU, disk space, or network bandwidth. Running processes are very volatile because they can change rapidly or disappear completely when
the system is shut down, rebooted, logged off, or crashed. Running processes can also be affected by other processes or users that may modify or terminate them. Therefore, running processes must be collected first before any other type of evidence in a computer system
A security analyst is trying to identify possible network addresses from different source networks belonging to the same company and region.
Which of the following shell script functions could help achieve the goal?
function w() { a=$(ping -c 1 $1 | awk-F â/â âEND{print $1}â) && echo â$1 | $aâ }
function x() { b=traceroute -m 40 $1 | awk âEND{print $1}â) && echo â$1 | $bâ }
function y() { dig $(dig -x $1 | grep PTR | tail -n 1 | awk -F â.in-addrâ â{print $1}â).origin.asn.cymru.com TXT
+short }
function z() { c=$(geoiplookup$1) && echo â$1 | $câ }
ation:
ell script function that could help identify possible network addresses from different source networks bel ame company and region is:
y() { dig $(dig -x $1 | grep PTR | tail -n 1 | awk -F â.in-addrâ â{print $1}â).origin.asn.cymru.com TX
nction takes an IP address as an argument and performs two DNS lookups using the dig command. The ses the -x option to perform a reverse DNS lookup and get the hostname associated with the IP addres ookup uses the origin.asn.cymru.com domain to get the autonomous system number (ASN) and other
ation related to the IP address, such as the country code, registry, or allocation date. The function then pr ess and the ASN information, which can help identify any network addresses that belong to the same A
rity analyst is writing a shell script to identify IP addresses from the same country. f the following functions would help the analyst achieve the objective?
tion w() { info=$(ping -c 1 $1 | awk -F â/â âEND{print $1}â) && echo â$1 | $infoâ } tion x() { info=$(geoiplookup $1) && echo â$1 | $infoâ }
tion y() { info=$(dig -x $1 | grep PTR | tail -n 1 ) && echo â$1 | $infoâ }
tion z() { info=$(traceroute -m 40 $1 | awk âEND{print $1}â) && echo â$1 | $infoâ }
Explan
The sh onging
to the s
function T +short
}
This fu first
lookup u s. The
second l
inform ints the
IP addr SN or
region
func
func
func
func
Explanation:
The function that would help the analyst identify IP addresses from the same country is: function x() { info=$(geoiplookup $1) && echo â$1 | $infoâ }
This function takes an IP address as an argument and uses the geoiplookup command to get the geographic location information associated with the IP address, such as the country name, country code, region, city, or latitude and longitude. The function then prints the IP address and the geographic location information, which can help identify any IP addresses that belong to the same country.
f the following should be completed first to remediate the findings? the web development team to update the page contents
the IP address allow listing for control panel access hase an appropriate certificate from a trusted root CA orm proper sanitization on all fields
ation:
action that should be completed to remediate the findings is to perform proper sanitization on all fields ation is a process that involves validating, filtering, or encoding any user input or data before processing t on a system or application. Sanitization can help prevent various types of attacks, such as cross-site s QL injection, or command injection, that exploit unsanitized input or data to execute malicious scripts,
nds, or queries on a system or application. Performing proper sanitization on all fields can help address itical and common vulnerability found during the vulnerability assessment, which is XSS.
A security analyst obtained the following table of results from a recent vulnerability assessment that was conducted against a single web server in the environment:
Which o
Ask
Add
Purc
Perf
Explan
The first .
Sanitiz or
storing i cripting
(XSS), S
comma the
most cr
A user reports a malware alert to the help desk. A technician verities the alert, determines the workstation is classified as a low-severity device, and uses network controls to block access. The technician then assigns the ticket to a security analyst who will complete the eradication and recovery processes.
Which of the following should the security analyst do next?
Document the procedures and walk through the incident training guide.
Reverse engineer the malware to determine its purpose and risk to the organization.
Sanitize the workstation and verify countermeasures are restored.
Isolate the workstation and issue a new computer to the user.
Explanation:
nce: https://www.cynet.com/incident-response/incident-response-sans-the-6-steps-in-depth/
digital forensics investigator works from duplicate images to preserve the integrity of the original evidence. f the following types of media are most volatile and should be preserved? (Select two).
mory cache stry file storage
porary filesystems et decoding volume
ation:
cache and swap volume are types of media that are most volatile and should be preserved during a dig cs investigation. Volatile media are those that store data temporarily and lose their contents when the po ff or interrupted. Memory cache is a small and fast memory that stores frequently used data or instructi ccess by the processor. Swap volume is a part of the hard disk that is used as an extension of the memor mory is full or low.
nce: https://www.techopedia.com/definition/10339/memory-dump
Sanitizing the workstation and verifying countermeasures are restored are part of the eradication and recovery processes that the security analyst should perform next. Eradication is the process of removing malware or other threats from the affected systems, while recovery is the process of restoring normal operations and functionality to the affected systems. Sanitizing the workstation can involve deleting or wiping any malicious files or programs, while verifying countermeasures are restored can involve checking and updating any security controls or settings that may have been compromised.
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A development team recently released a new version of a public-facing website for testing prior to
production. The development team is soliciting the help of various teams to validate the functionality of the website due to its high visibility.
Which of the following activities best describes the process the development team is initiating?
Static analysis
Stress testing
Code review
User acceptance testing
Explanation:
nce: https://www.techopedia.com/definition/3887/user-acceptance-testing-uat
rity technician is testing a solution that will prevent outside entities from spoofing the company's email d compatia.org. The testing is successful, and the security technician is prepared to fully implement the solution.
f the following actions should the technician take to accomplish this task? TXT @ "v=spfl mx include:_spf.comptia. org -all" to the DNS record.
XT @ "v=spfl mx include:_sp£.comptia.org -all" to the email server.
TXT @ "v=spfl mx include:_sp£.comptia.org +all" to the domain controller. TXT @ "v=apfl mx lnclude:_spf .comptia.org +a 11" to the web server.
ation:
TXT @ âv=spfl mx include: _spf.comptia. org -allâ to the DNS record can help to prevent outside entit poofing the companyâs email domain, which is comptia.org. This is an example of a Sender Policy Fram ecord, which is a type of DNS record that specifies which mail servers are authorized to send email on behalf main. SPF records can help to prevent spoofing by allowing the recipient mail servers to check the validi derâs domain against the SPF record. The â-allâ at the end of the SPF record indicates that any mail serv
sted in the SPF record is not authorized to send email for comptia.org.
nce: https://www.cloudflare.com/learning/ssl/what-is-domain-spoofing/
User acceptance testing is a process of verifying that a software application meets the requirements and expectations of the end users before it is released to production. User acceptance testing can help to validate the functionality, usability, performance and compatibility of the software application with real-world scenarios and feedback. User acceptance testing can involve various teams, such as developers, testers, customers and stakeholders.
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Explan
Adding ies
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(SPF) r
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is not li
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A security analyst who works in the SOC receives a new requirement to monitor for indicators of compromise.
Which of the following is the first action the analyst should take in this situation?
Develop a dashboard to track the indicators of compromise.
Develop a query to search for the indicators of compromise.
Develop a new signature to alert on the indicators of compromise.
Develop a new signature to block the indicators of compromise.
Explanation:
ation:
nce: https://www.crowdstrike.com/cybersecurity-101/incident-response/indicators-of-compromise/
an investigation, an analyst discovers the following rule in an executive's email client:
ecutive is not aware of this rule.
f the following should the analyst do first to evaluate the potential impact of this security incident?
ck the server logs to evaluate which emails were sent to <someaddress@domain,com>. he SIEM to correlate logging events from the email server and the domain server.
ove the rule from the email client and change the password. ommend that the management team implement SPF and DKI
ation:
ng the server logs to evaluate which emails were sent to <someaddress@domain,com> is the first action should do to evaluate the potential impact of this security incident. Server logs are records of events or
Developing a query to search for the indicators of compromise is the first action the analyst should take in this situation. Indicators of compromise (IOCs) are pieces of information that suggest a system or network has been compromised by an attacker. IOCs can include IP addresses, domain names, file hashes, URLs, or other artifacts that are associated with malicious activity. Developing a query to search for IOCs can help to identify any potential incidents or threats in the environment and initiate further investigation or response.
Explan Refere
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Checki the
analyst
activities that occur on a server, such as email transactions, web requests, or authentication attempts. Checking the server logs can help to determine how many emails were sent to <someaddress@domain,com>, when they were sent, who sent them, and what they contained. This can help to assess the scope and severity of the incident and plan further actions.
Reference: https://www.techopedia.com/definition/1308/server-log
A security analyst is investigating a compromised Linux server.
The analyst issues the ps command and receives the following output:
Which of the following commands should the administrator run next to further analyze the compromised system?
proc/1301
V openssh-server Is -1 /proc/1301/exe
9 1301
ation:
1 /proc/1301/exe is the command that will show the absolute path to the executed binary file associated cess ID 1301, which is ./usr/sbin/sshd. This information can help the security analyst determine if the bi cial version and has not been modified, which could be an indicator of a compromise. /proc/1301/exe is
ymbolic link that points to the executable file that was used to start the process 1301.
nce: https://unix.stackexchange.com/questions/197854/how-does-the-proc-pid-exe-symlink-differ-from-
-symlinks
lowing output is from a tcpdump al the edge of the corporate network:
f the following best describes the potential security concern?
gbd /
rpm -
/bin/
kill -
Explan
/bin/ls - with
the pro nary is
an offi a
special s
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The fol
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Payload lengths may be used to overflow buffers enabling code execution.
Encapsulated traffic may evade security monitoring and defenses
This traffic exhibits a reconnaissance technique to create network footprints.
The content of the traffic payload may permit VLAN hopping.
Explanation:
Encapsulated traffic may evade security monitoring and defenses by hiding or obfuscating the actual content or source
of the traffic. Encapsulation is a technique that wraps data packets with additional headers or protocols to enable communication across different network types or layers.
Encapsulation can be used for legitimate purposes, such as tunneling, VPNs, or NAT, but it can also be used by attackers to bypass security controls or detection mechanisms that are not able to inspect or analyze the encapsulated traffic.
Reference: https://www.techopedia.com/definition/10339/memory-dump
pany's threat team has been reviewing recent security incidents and looking for a common theme. The te red the incidents were caused by incorrect configurations on the impacted systems. The issues were rep teams, but no action was taken.
f the following is the next step the company should take to ensure any future issues are remediated?
uire support teams to develop a corrective control that ensures security failures are addressed once they are ed.
uire support teams to develop a preventive control that ensures new systems are built with the required s rations.
uire support teams to develop a detective control that ensures they continuously assess systems for confi
uire support teams to develop a managerial control that ensures systems have a documented configuratio baseline.
ation:
ng support teams to develop a corrective control that ensures security failures are addressed once they ar ed is the best step to prevent future issues from being remediated. Corrective controls are actions or nisms that are implemented after a security incident or failure has occurred to fix or restore the normal st em or network. Corrective controls can include patching, updating, repairing, restoring, or reconfiguring
or components that were affected by the incident or failure.
nce: https://www.techopedia.com/definition/10339/memory-dump
A com am
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Req n
Explan
Requiri e
identifi
mecha ate of
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