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

Static analysis result for SHA-256 da60deacb13e5c07…

MALICIOUS

Office (OLE) / .XLS

211.0 KB Created: 2020-09-24 19:32:47 Authoring application: Microsoft Excel
MD5: 29633abd7785ed8fdb7d1f550d753f4c SHA-1: 0600ebc5153cca42e37a1946dba125acf8e8aae6 SHA-256: da60deacb13e5c0793091150e288a51cf44ba1bf82b16d62639c1fd57a7ba085
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests that malicious code is intended to execute automatically when the file is opened. 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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