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

Static analysis result for SHA-256 d98e1ceeb9dc9c09…

MALICIOUS

Office (OLE) / .XLS

340.0 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: 0b80768b6ed72d5ff65e2412340b2948 SHA-1: 6aa049ec3d43d261bb9341a9c2682f6e324c6d1c SHA-256: d98e1ceeb9dc9c097bc3d1e14893c344657f67431e9b955833c1adbd85986493
120 Risk Score

Malware Insights

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

The critical ClamAV heuristic firing indicates this is a known dropper variant. The presence of an encrypted Excel 4.0 macro sheet, specifically identified as an auto-open macro, strongly suggests it's designed to execute malicious code upon opening. The encrypted nature and the specific detection name point towards a downloader or dropper functionality.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8025504-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8025504-0
  • 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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