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

Static analysis result for SHA-256 0272b569145660b6…

MALICIOUS

Office (OLE) / .XLS

184.0 KB Created: 2020-11-10 04:27:50 Authoring application: Microsoft Excel
MD5: e5aabdbeeac9f0fa7b149bbc360ede6e SHA-1: 82ef049e9cfb964942d848dfda6cd3f2f9d7cebc SHA-256: 0272b569145660b64a8bcc7f053f4de26cd3dd1122006310268ef28d3d9dc9ca
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro further suggests that malicious code is intended to execute automatically when the spreadsheet is opened. The document body was not parsable, limiting further analysis of the specific payload.

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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