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

Static analysis result for SHA-256 fd5fecefc307f3a8…

MALICIOUS

Office (OLE) / .XLS

1010.0 KB Created: 2005-10-27 17:12:04 Authoring application: Microsoft Excel
MD5: 3e65112545511299f2dafd8617200354 SHA-1: bbb3d2f5c475702b94529e9520ab9dd60dfb9c8f SHA-256: fd5fecefc307f3a8afb5952b0775d302507bf9380e546b649589ad47f146d457
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1547.001 Registry Run Keys / Startup Folder

The file is an Excel 4.0 macro-enabled workbook containing XLM macros. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous functions like RUN, suggesting an attempt to execute arbitrary code. The embedded text mentions infecting other workbooks and saving them as 'Book1.xls', along with a payload reference 'Hydrocodone/APAP 10-650 For Your Computer'. The presence of 'XF.Classic' and 'Poppy' markers points to known legacy Excel macro viruses.

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
248550c50d1b6032763ce13c63c54c187747e6ff67a685f565a7a85310722c76		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 231491 bytes

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