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

Static analysis result for SHA-256 cfc9fd6db03e80e3…

MALICIOUS

Office (OLE) / .XLS

180.0 KB Created: 2009-08-28 01:13:41 Authoring application: Microsoft Excel
MD5: aec7bc4358ee17b6a8b97ae0f7c0ebdf SHA-1: cc508d483788101e5d301b5ef2b356eee44b4cf1 SHA-256: cfc9fd6db03e80e38384eb4fd091dd562daac5ee30b21d3ef38caf5614977a8c
200 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a known technique for executing malicious code upon opening the document. The embedded text and macro names like 'XL4Poppy', 'Classic.Poppy by VicodinES', and 'The Narkotic Network 1998' strongly suggest this is a legacy macro virus. The Auto_Open macro likely attempts to download and execute a second-stage payload, as indicated by the 'RUN=5' API call.

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
1aad4d739d6c0966917eb97320089643a8ec2258721d26290fca7bf7b2e30654		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 62268 bytes

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