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

Static analysis result for SHA-256 14cbfc9cd226b97e…

MALICIOUS

Office (OLE) / .XLS

799.0 KB Created: 2000-05-26 16:45:09 Authoring application: Microsoft Excel
MD5: 62e65b4bb49e84082cfcc449f077dc6b SHA-1: 1e3ab332199944e618f3c50f0116ec4fbd12a430 SHA-256: 14cbfc9cd226b97e5176fcc2fb40ca350ad80c81ca07c6e96d2bd6467c912ea9
162 Risk Score

Malware Insights

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

The file contains both legacy Excel 4.0 (XLM) macros and VBA macros, indicated by critical heuristic firings. The presence of these macros suggests an attempt to execute arbitrary code upon opening. The XLM macro sheet is particularly large and contains numerous BOUNDSHEET entries, hinting at complex functionality. While no specific URLs or executable payloads were directly extracted, the macro structure strongly implies a downloader or dropper functionality.

Heuristics 5

  • 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.
  • ClamAV: Xls.Malware.Generic-6680536-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Generic-6680536-0
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f31f5d5e1f108673ba0cbaf9f4d7c78a43ddea3208e686667062a20c05d264c9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 867048 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
macros.bas
f1a0a1924498708ffcd80c76cbe0099a7455fcbadc042a137c46e5b69a1d37b8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9033 bytes

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