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

Static analysis result for SHA-256 1a7af84d6b93d6a5…

MALICIOUS

Office (OLE) / .XLS

104.0 KB Created: 2010-09-15 02:47:34 Authoring application: Microsoft Excel
MD5: 8cdb5630111e8e459a8d18aed7ad8d12 SHA-1: eda324dbf5e1c71682428192128a869f4eebfeb2 SHA-256: 1a7af84d6b93d6a5eda969d879955d00925a264983b8157d63769e34e410f90e
200 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 (XLM) macros, specifically an Auto_Open entry. The macro sheet is associated with legacy Excel formula macro viruses, with markers suggesting infection and payload delivery. The DOC BODY mentions 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998', along with paths like 'C:\Program Files\Microsoft Office\OFFICE11\xlstart\Book1.xls', indicating an attempt to infect the startup folder and potentially spread. The XLM macros likely execute dangerous functions such as RUN, aiming 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
7692fea7b1af63329bdd82cbc8c9a140ae545b2d0c26b25927bc08346bdc85de		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9971 bytes

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