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

Static analysis result for SHA-256 008d9e8cfb8fdcd7…

MALICIOUS

Office (OLE) / .XLS

220.0 KB Created: 2020-10-01 02:50:32 Authoring application: Microsoft Excel
MD5: cdd5660d7fcd656d7f177d376135df71 SHA-1: 15a4a8cb72fdfa846f7c1d2bb2595b56ad4f64d1 SHA-256: 008d9e8cfb8fdcd78f76d0811cf4e1c1c0b9be54c0eaacf64e420237883e3e0c
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, which is a common technique for delivering malicious content. The presence of an AutoOpen macro further suggests that the sheet is designed to execute automatically upon opening. While no specific payload or URL was extracted, the encryption and macro usage strongly indicate a malicious intent.

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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