Tools like LZMA2 (used in 7-Zip) or Precomp are used to compress data to its smallest possible size.
Repacked files are a classic vector for malware distribution. Because repackers operate outside any quality control or legitimate testing processes, their files are often injected with malicious code. This code can take many forms: yesmaal repack
The Yesmaal Repack model operates on a straightforward, closed-loop system: Tools like LZMA2 (used in 7-Zip) or Precomp