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

Static analysis result for SHA-256 df2bb8b48a4d7834…

MALICIOUS

Office (OLE) / .XLS

147.0 KB Created: 2010-02-09 09:41:41 Authoring application: Microsoft Excel
MD5: 35136a1003ca50f5062ab31dc34e5215 SHA-1: 3a6da8ed5e57403adfe4e55b71a0101a45f6ed5d SHA-256: df2bb8b48a4d7834e132d93f3fafad677a61afde21de23ed9bb4b7c9f411dc3f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.001 Command and Scripting Interpreter: PowerShell T1566.001 Phishing: Spearphishing Attachment

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. Critical heuristics indicate the presence of an Auto_Open macro, which is a known technique for executing malicious code upon opening the document. The macro sheet contains references to 'RUN' and other dangerous functions, suggesting it attempts to execute arbitrary commands. The document body and macro names like 'XL4Poppy' and 'XF.Classic' point to a legacy macro virus designed to infect other workbooks and potentially download additional payloads.

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.
  • Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUS
    Workbook stream contains self-identifying legacy Excel formula macro virus markers. This indicates the document carries formula macro virus content even when no VBA project or modern XLM macro-sheet structure is present.
  • 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
f13e90222f80312bde8891538b4fd7c7beab2b6d70b135792c6a54cf04b3588e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 83719 bytes

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