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

Static analysis result for SHA-256 5498632f2b90943e…

MALICIOUS

Office (OLE) / .XLSX

136.5 KB Created: 2008-08-15 01:59:00 Authoring application: Microsoft Excel
MD5: c9ecd64b5582760d0745c36047e62661 SHA-1: 3b8166b4d8f10ffafefebfe2aea96e5131beaaf7 SHA-256: 5498632f2b90943eafed704ee35f630725dfbe53d9c3d578470545f63406c2ce
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The document body explicitly prompts the user to 'Enable Editing' and 'Enable Content' to view the content, indicating a social engineering lure. The presence of the Auto_Open macro and the prompt strongly suggests the macro is designed to execute automatically upon opening, likely to download and execute a second-stage payload. ClamAV also detected this as Xls.Dropper.Agent-8803508-0.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Dropper.Agent-8803508-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8803508-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
57a29b42ec30be69b5b883405998d4758da978b7fda3af28a7c0fb31d6ca72cf		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 80781 bytes

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