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

Static analysis result for SHA-256 73ff8c871b5aa8a5…

MALICIOUS

Office (OLE) / .XLS

237.5 KB Created: 2020-09-20 23:07:45 Authoring application: Microsoft Excel
MD5: a8d80bf398498fd9a6b5bc45fe572c88 SHA-1: 5f838bd5bc8ac77bcfe76a5fd0dbf00f002d2cdd SHA-256: 73ff8c871b5aa8a56c71a1abf58c751558f46dfbddee7ae18fcbbb72a5aed46d
60 Risk Score

Malware Insights

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

The presence of an encrypted Excel 4.0 macro sheet, identified by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic, strongly suggests that this file is designed to execute malicious code upon opening. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of auto-executable macros. While no specific URLs or scripts were extracted, the file's structure points to a classic macro-based attack vector.

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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