Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 4736ae69628bc37d…

MALICIOUS

Office (OLE) / .XLS

217.0 KB Created: 2020-10-07 06:38:18 Authoring application: Microsoft Excel
MD5: c9daa5ffd59521d41dda3dda15286e08 SHA-1: 66a9db43200260f9404e8ad7920148fd4cf32f08 SHA-256: 4736ae69628bc37d9723d1dbe9156b92b94d6349d8708773f8ae4c25b35c6fb7
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executing macro. Due to the encrypted nature of the document body and lack of script content, the exact payload and delivery mechanism cannot be determined, but the presence of these heuristics strongly suggests malicious intent.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Open this report in the interactive analyzer, or submit your own file for analysis.