bugku Social Worker-Advanced Collection [MISC]

Topic links: https://ctf.bugku.com/challenges/detail/id/188.html?page=4
Title Author: Aman
Tip: Flag US small-cell {name} Pinyin
Description: Xiao Ming tried every year in pursuit of a small US Ways to get the address of Xiaomei. Until one day Xiaomei sent a comment, Xiaoming felt hope came. (Adapted for actual combat, the difficulty is reduced.)

Problem-solving ideas:
The file given to the problem is a screenshot of QQ space.

Through binwalk, zstegand StegSolveas well as 010 Editorthe picture scanning routine and found no useful information, began to observe the picture content.

Combined with the hints given in the topic, the following conclusions are drawn:

1. The nearest subway station to Xiaomei’s home. It takes 7 stops to reach this location on the map, including 1 transfer
2. The nearest subway station to Xiaomei’s is a terminal station
3. Xiaomeijia is more than 800 meters away from the nearest subway station, and more than one kilometer away from the second nearest subway station. Under normal circumstances, Xiaomei’s home is between two subway stations and slightly closer to the terminal

With these conditions, just use Baidu knowledge map to determine where a small US to take pictures of places (locals can avoid this step)
after knowledge map which is found Dayan Pagoda .

So I opened the Gaode map (the other maps are the same) and started searching for the Xi’an Big Wild Goose Pagoda. The

Big Wild Goose Pagoda itself is also a subway station, so you only need to count to the Big Wild Goose Pagoda station, pass an interchange station and there are 7 stations and the subway station is the terminal station. .

Soon, I locked the Weiqunan Station on Line 2. It is exactly seven stops away from Dayan Pagoda Station, and you need to transfer at Xiaozhai Station. Most importantly, he is also a terminal.

So here comes the problem. With so many neighborhoods nearby, how can we narrow down the area?
This uses the other two prompt messages given in the picture:

1. More than 800 meters from Weiqu South Station
2. More than 1 km from Hangtiancheng Station
3. I live in a residential building rather than a weird hotel.

When we searched for " residential " within 900 meters near Weiqunan, we

basically found 60 results directly, because Gaode can only display 20 per page, so there are only 20 on the map.

Then use other conditions to continue to exclude. Use the ranging function to make three lines. One is a line 1 km away from the Aerospace City, the other is a line 2 km away from the Aerospace City, and the last is a line 750 meters away from Weiqu South.
Because the conditions are more than 1 km, more than 800 meters. Therefore, the communities that are two kilometers away from the Aerospace City and within one kilometer; and those within 750 meters of Weiqu South (this should be 800 meters, but for fear of missing the key results, there is a certain tolerance) basically excluded.

In this way, at least 80% of the cells are eliminated. Look carefully. These two distance lines almost overlap. This means that the communities that must meet the two conditions at the same time are not on both sides of the main road, South Chang'an Avenue.

Okay, there is not much left

• Dongxin Garden
• Changan Changyun International Garden
• Materials Three Station Family Home
• Family Home of Chang'an Auto Parts Company

Then start trying one by one. f**k, four, capitalization and removal of the garden family courtyard at the back. I tried more than a dozen results, all wrong.

I had no choice but to see what the big guys said in the comment area. Many bigwigs have suggested not to be confined to the community. what? Could it be that my thinking is wrong?
I tried a few more to exclude communities, hotels , bus stations , China National Petroleum Corporation , and Sinopec , until I got a server error. .

---

I looked for a moment staring at the map, suddenly found the edge of a circle 900 meters Rancho international city , he had a part in the circle. But most of them are outside the circle, which also caused this community to not appear in the search results, and also caused me to ignore him all the time.

His distance also just meets the conditions.

Try again, good night if it's wrong.

As a result, it was really him.

flag{lanqiaoguojicheng}

School starts tomorrow, good night!