digital forensics

  • CyberDefenders Hammered

    From https://cyberdefenders.org/labs/42 Initial Analysis Initial Findings Manipulating the Logs auth.log - sorted by command then time auth.log - all unique lines sorted by command (excluding timestamp) auth.log - extract commands auth.log - extract IPs www-access.log - extract IPs www-access.log - extract user agents Questions #1 Which service did the attackers use to gain access to the system? #2 What is the operating system version of the targeted system?

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  • BTLO Challenge: Malicious PowerShell Analysis

    https://blueteamlabs.online/home/challenge/7 Open the file Decode the file Deobfuscating the script Spacing Fillers Chars Variables Format Strings Replaces Splits Questions What security protocol is being used for the communication with a malicious domain? What directory does the obfuscated PowerShell create? (Starting from \HOME) What file is being downloaded (full name)? What is used to execute the downloaded file? What is the domain name of the URI ending in ‘/6F2gd/’ Based on the analysis of the obfuscated code, what is the name of the malware?

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  • CyberDefenders MalDoc101

    From https://cyberdefenders.org/labs/51 Tools Used 1. Multiple streams contain macros in this document. Provide the number of highest one. 2. What event is used to begin the execution of the macros? 3. What malware family was this maldoc attempting to drop? 4. What stream is responsible for the storage of the base64-encoded string? 5. This document contains a user-form. Provide the name? 6. This document contains an obfuscated base64 encoded string; what value is used to pad (or obfuscate) this string?

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  • SANS April 2021 Forensic Quiz

    From https://isc.sans.edu/forums/diary/April+2021+Forensic+Quiz/27266/ Introduction Artifacts Excel-related Executables and DLLs Scheduled Task Pcaps Export objects Traffic Summary SHAs Introduction We’re provided with a .pcap and a bunch of artifacts (files). The AD, we’re told, is as follows: LAN segment range: 192.168.5.0/24 (192.168.5.0 through 192.168.5.255) Domain: clockwater.net Domain Controller: 192.168.5.5 - Clockwater-DC LAN segment gateway: 192.168.5.1 LAN segment broadcast address: 192.168.5.255 Artifacts First, let’s inspect the artifacts.

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  • Splunk BOTSv3 Write-Up

    Splunk have several “Boss of the SOC” datasets, simulating a security incident - think of it as a Blue Team/SIEM-based CTF. This is my write-up for BOTSv3, at the time of writing the most recent dataset available. It seems that Taedonggang, a North Korean group, have attacked Frothly, a beer maker… The official BOTSv3 page is here: https://github.com/splunk/botsv3 I wrote this on Notion, and it is best viewed there, as it is always up-to-date and is visually best.

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