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

Static analysis result for SHA-256 d3423a8be2b06f14…

MALICIOUS

Office (OLE) / .XLS

28.5 KB Created: 2010-06-11 07:44:12 Authoring application: Microsoft Excel
MD5: 91385725307fe571ae47656893a7eb61 SHA-1: de6bc3c53df233e32d326f0126a4afcb7a9ac2d7 SHA-256: d3423a8be2b06f1499980b47f6e5e3f257bfb23d6dee814b0744a35aeb0507dd
200 Risk Score

Malware Insights

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

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. Critical heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. The embedded macro sheet contains references to 'Auto_Open' and 'Auto_Close', and the document body mentions 'Excel Formula Macro Virus (XF.Classic)' and 'Poppy by VicodinES', suggesting it's a known legacy macro virus. The script's intent is to execute arbitrary commands via the RUN function, likely to download and run a second-stage payload.

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
9be091cce86b0b7afef89c8e4f2d8291f57151017e42afc403ea320a0ee5a38c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9517 bytes

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