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

Static analysis result for SHA-256 72bfb807705952b2…

MALICIOUS

Office (OLE) / .XLS

192.5 KB Created: 2021-02-23 19:19:01 Authoring application: Microsoft Excel
MD5: dc5cb1bc2d2b8f9c8172de5f5a8e6c4a SHA-1: 0619b5218df8c96c6072f10d613e0f5791cbcc1a SHA-256: 72bfb807705952b26eee33f353b55dbaba125339b146b68b40f770b53c591e09
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests it is designed to execute automatically upon opening. This points to a macro-based attack, commonly used for initial access via spearphishing attachments.

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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