Malware Analysis & Reverse Engineering (Case Study)



Summary of Findings 

  • Testbook3.xlsm.mlw: 64f129da1ab476723f147ec9ad92ad0d
  • Malware creation Date: 2017-04-24 01:53:22Z
  • Malware Type: Downloader Trojan

VirusTotal resulted in 27/ 57 detections as malicious. This dropper steals username and password information from the SAM database of the victim. This is evidenced by API calls made using SAMSRV.DLL. The stolen data is then sent across an encrypted communications link using  SSLv2 encryption.

The malware begins to enumerate SAM hashes from the SAM database and encrypts them before transmitting the stolen data. The malware makes use of several APIs in this process including: crypt32.dll, bcrypt.dll, ncrypt.dll, cryptdll.dll, secure32.dll.  Continue reading