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

Static analysis result for SHA-256 415515f39bcb4250…

MALICIOUS

Office (OLE) / .XLS

194.5 KB Created: 2020-10-18 22:55:30 Authoring application: Microsoft Excel
MD5: 5103c9912df0b9aa3cb8029e4284140f SHA-1: babb889c4fc11c5878d5f34edf8fcf4a0e516e1c SHA-256: 415515f39bcb4250acddb18636596dbba36c9c80785a6541aa19e20f41d67619
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

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

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.

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