bandit Writeup

Challenge Description

An Jieyab as informant took a photo of a vehicle, can you find the location?

The flag is name the location and date example TCP1P{Town, Coutry. Month Year}

Example : TCP1P{Yogyakarta, Indonesia. June 2010}

Solution

Step 1: Analyze the Image Metadata Using EXIFTOOL

The first clue in this challenge comes from analyzing an image file. To extract metadata from an image, we use ExifTool, a tool specifically designed for this purpose.

exiftool suspect.jpg

In this case, running ExifTool reveals the following:

Date/Time Original              : 2019:10:25 17:00:00

The timestamp shows that the image was taken on October 25, 2019, at 5:00 PM.

Step 2: Identifying the License Plate

Upon examining the image, we observe that a license plate is visible, and it contains the letter N.

This letter might be crucial in narrowing down the geographical region of the license plate, so we turn to external resources to investigate further.

Step 3: Research Vehicle Registration Plates

Since the organizers of the CTF event are from Indonesia, we hypothesize that the license plate follows the Indonesian vehicle registration system.

After conducting some research on Wikipedia, we find a page about Vehicle registration plates of Indonesia.

According to the page, license plates with the letter N are registered in East Java, particularly in the following regions:

• Malang Residency
• Malang Regency
• City of Malang
• Pasuruan Regency
• City of Pasuruan
• Lumajang
• Batu

Based on this information, we can reasonably conclude that the license plate originates from the Malang region in East Java, Indonesia. After trying, it turns out that Malang was the correct answer.

Conclusion

To summarize the steps we took:

1. Used ExifTool to extract metadata from the image, finding the timestamp when it was captured.
2. Identified the letter N on the license plate and researched its significance.
3. Concluded that the license plate belongs to a vehicle from Malang, East Java, Indonesia.

Flag

TCP1P{Malang, Indonesia. October 2019}