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

Static analysis result for SHA-256 055dce6a5cafb576…

MALICIOUS

Office (OLE) / .XLS

218.0 KB Created: 2020-10-01 02:52:16 Authoring application: Microsoft Excel
MD5: f48543efedbca7d371ef0ef14aaeff44 SHA-1: b75e97bf24dd41ee78c63deab67e2ce58845357d SHA-256: 055dce6a5cafb5769b57ffd78cde84db9b7c28ac91ad4a50e70325a54592f0bc
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, which is a strong indicator of malicious intent. The presence of an 'AUTOOPEN' macro further suggests that the sheet is designed to execute automatically upon opening. Without further deobfuscation or script content, the exact payload and delivery mechanism remain unclear.

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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