CyberDefender - GrabThePhisher
Challenge: https://cyberdefenders.org/blueteam-ctf-challenges/95
Scenario
An attacker compromised a server and impersonated https://pancakeswap.finance/, a decentralized exchange native to BNB Chain, to host a phishing kit at https://apankewk.soup.xyz/mainpage.php. The attacker set it as an open directory with the file name “pankewk.zip”.
Provided the phishing kit, you as a soc analyst are requested to analyze it and do your threat intel homework.
Q1
Which wallet is used for asking the seed phrase?
Recon
從scenario就可以知道他大概是一個網站被攻擊後盜用，轉變成用來騙別人的釣魚網站，因此可以看一下整體的資料夾結構會發現他所採用的錢包就是metamask
Flag: Metamask
Q2
What is the file name that has the code for the phishing kit?
Recon
同上，只要觀察資料夾結構就可以知道有一個file叫做metamask.php
Flag: metamask.php
Q3
In which language was the kit written?
Recon
同上
Flag: php
Q4
What service does the kit use to retrieve the victim’s machine information?
Recon
這個就比較有趣一點，通常問的應該是哪一個api之類的服務，所以應該要往這個方向想，看了一下matamask.php，裡面有提到
1 | |
代表他所使用的應該是Sypex Geo這個service，查了一下，可以看一下github repo，的確就像題目敘述一樣是可以藉由IP取得受害者機器的一些相關訊息
Flag: Sypex Geo
Q5
How many seed phrases were already collected?
Recon
我是直接看/log/log.txt的內容發現有三行，且每一行都有固定12個phrase，所以我猜應該已經取得三個受害電腦的seed phrase
Flag: 3
Q6
Write down the seed phrase of the most recent phishing incident?
Exploit
同上，把最後一列的seed phrase貼上就對了
Flag: father also recycle embody balance concert mechanic believe owner pair muffin hockey
Q7
Which medium had been used for credential dumping?
Recon
如果仔細看metamask.php的後半段會發現他還有call到telegram的API，主要用途是拿取seed phrase，再把這些東西append到/log/log.txt中
Flag: telegram
Q8
What is the token for the channel?
Recon
同上
Flag: 5457463144:AAG8t4k7e2ew3tTi0IBShcWbSia0Irvxm10
Q9
What is the chat ID of the phisher’s channel?
Exploit
同上
Flag: 5442785564
Q10
What are the allies of the phish kit developer?
Exploit
可以從註解當中看到j1j1b1s@m3r0這個人應該也有提供一些協助
Flag: j1j1b1s@m3r0
Q11
What is the full name of the Phish Actor?
Exploit
如果把檔案中提供的token/id當作TG的parameter會得到甚麼東西呢?$\to$https://api.telegram.org/bot5457463144:AAG8t4k7e2ew3tTi0IBShcWbSia0Irvxm10/getChat?chat_id=5442785564
Flag: Marcus Aurelius
Q12
What is the username of the Phish Actor?
Exploit
同上
Flag: pumpkinboii
Reference
A walkthrough of CyberDefenders “GrabThePhisher — Threat intel” CTF