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

Static analysis result for SHA-256 e8d24a281e3eb70d…

MALICIOUS

Office (OLE) / .XLS

245.5 KB Created: 2020-09-20 23:06:53 Authoring application: Microsoft Excel
MD5: 7e3b2039afe5ba2a8f9167fc2f977b90 SHA-1: 697954999d15edde6b0b0eca6dd71db1a319a5d0 SHA-256: e8d24a281e3eb70d136582566b2ba6957d42680b0adcd1b54417580ba51dff83
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, preventing deeper analysis of its specific actions. The presence of encrypted macros and the 'AUTOOPEN' heuristic strongly suggest an attempt to automatically execute malicious code upon opening the spreadsheet. Without further deobfuscation or script content, the exact payload and delivery mechanism remain unknown.

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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