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

Static analysis result for SHA-256 0b3b6a5cd86840fa…

MALICIOUS

Office (OLE) / .XLS

219.0 KB Created: 2010-07-16 05:28:03 Authoring application: Microsoft Excel
MD5: 3f1c896939c82f4979f2016c414ca1be SHA-1: 3fc30ab7f54f73f1751fb291fe87c4e36a61f52f SHA-256: 0b3b6a5cd86840fa2f4b94307be8a972011c996b250758228611a8eb5741bb29
200 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing legacy Excel 4.0 macros, specifically an Auto_Open macro. Heuristics indicate the presence of dangerous formula APIs like RUN, suggesting the macro is designed to execute arbitrary code. The embedded text and macro names like 'XL4Poppy', 'Classic.Poppy', and 'The Narkotic Network' point to a known Excel macro virus family. The macro likely attempts to download and execute 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
2dfe7879ccf54c45bddc1d48492c2f22cac26627203d5814d9c66a1930f949b2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9934 bytes

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