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

Static analysis result for SHA-256 0967e3617c355f2e…

MALICIOUS

Office (OLE) / .XLS

345.0 KB Created: 2021-12-17 13:23:39 Authoring application: Microsoft Excel
MD5: 592239cd66d00aa7b2d91b91559fc6b8 SHA-1: dffd7de723a5e9110e9992bfff87ceae1ebc593f SHA-256: 0967e3617c355f2eca31b161584b70a8cad54260713cd0ba0e1e1622b11d196d
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AutoOpen macro (OLE_XLM_AUTOOPEN) suggests that the macro sheet is designed to execute automatically upon opening the file. This is a common technique for delivering secondary payloads, often via spearphishing attachments.

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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