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

Static analysis result for SHA-256 0aebf549c3ed27ea…

MALICIOUS

Office (OLE) / .XLS

238.0 KB Created: 2020-09-24 19:34:44 Authoring application: Microsoft Excel
MD5: 4034f70de7542908fc322eea02776c97 SHA-1: a19d136be581cae3a0686125adf61dbc622e45df SHA-256: 0aebf549c3ed27ea4c7cd22f87983b824f4256e1deea1057dc660ede5064e38d
60 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests it's designed to execute automatically upon opening. This points to a macro-based attack, commonly delivered via spearphishing attachments, aiming to execute arbitrary code.

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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