浑水摸鱼 (hún shuǐ mō yú): To take advantage of a chaotic situation for personal gain — Meaning & Stroke Order

In times of intense market competition, some companies fish in troubled waters by publishing false advertisements.

Don't try to fish in troubled waters; we must find out the truth.

He took advantage of the power outage to fish in troubled waters and stole the cash from the store.

During the election, some people fished in troubled waters by spreading rumors to influence voters.