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

Static analysis result for SHA-256 d549ffe907e604f8…

MALICIOUS

Office (OLE) / .XLS

56.0 KB Created: 2010-03-23 05:09:33 Authoring application: Microsoft Excel
MD5: 2589c5586e8addb0660dc2dc73d38d40 SHA-1: d92100e65c8596950faaaa8cf09296ebded6f365 SHA-256: d549ffe907e604f801c0b681737a6210aad14a291bbaf0742674b0c71eed43cc
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical heuristic firing indicates the presence of a legacy Excel formula macro virus, specifically mentioning 'Poppy by VicodinES' and 'The Narkotic Network'. The presence of XLM macros suggests an attempt to execute arbitrary code upon opening. The script section, though containing what appears to be a construction cost breakdown, also contains strings like 'Classic.Poppy by VicodinES' and 'An Excel Formula Macro Virus (XF.Classic)', further supporting the malware classification. The file attempts to infect other workbooks and save itself as 'Book1.xls' in the 'xlstart' directory, indicating a potential propagation or persistence mechanism.

Heuristics 2

  • 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.

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