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

Static analysis result for SHA-256 ac4b99079b1ceb11…

MALICIOUS

Office (OLE) / .XLS

90.0 KB Created: 2021-06-02 13:40:34 Authoring application: Microsoft Excel
MD5: 92dcc47a1a044fc3a2328ec6eef3918b SHA-1: 6f9266a6c0b702cbaa0a3583df5c8cd1357eae35 SHA-256: ac4b99079b1ceb11db593097e421de9d9092765feedc23a3ab8ef912b292c988
60 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests it's designed to execute automatically upon opening. The document body is unreadable, but the heuristics strongly point to a macro-based attack. Without readable script content or URLs, the exact payload and delivery mechanism remain unclear, leading to a moderate confidence score.

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.