My Challenges
2021
NYONG Coin
EnCase forensics
Description
'Kim' is the CEO of a cryptocurrency exchange 'A'.
He asked the management team for the full transaction history of 'NYONG coin' traded in a specific period.
And here is 'Lee', a member of the management team who hates 'Kim', delivered a maliciously manipulated transaction history to 'Kim' in a USB.
Analyze the USB and find one manipulated transaction in there!
Flag Format: ACSC{lowercase(MANIPULATED_TRANSACTION_ID)}
Download Link 1: https://1drv.ms/u/s!At0nZXK3fObIgoQAMtilBAZd017Klg?e=7VKBqz
Download Link 2: https://drive.google.com/file/d/10SfzE59dD88A_TFZTxfAvqoBwsO18dxU
SHA-1: 2E21641DCE2A37959D1010E1637B8FFAEC8CF627
Solution
Using Autopsy, we can see which files were modified.
Afterwards, diff-ing the files gives the modified row.
The flag is
ACSC{8d77a554-dc64-478c-b093-da4493a8534d}.Last modified 2mo ago
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