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

Static analysis result for SHA-256 51d9813bdabca0e2…

MALICIOUS

Office (OLE) / .XLS

141.0 KB Created: 2020-06-22 16:20:38 Authoring application: Microsoft Excel
MD5: b9773fbd64f3295368c0e847def4ed9f SHA-1: 6265e3733f0afb9405ab20494f6670c99610a165 SHA-256: 51d9813bdabca0e20dd72d9d4922a2991f261b35c4e6afa3807a9dcc0cf1f8c8
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The document body displays a message prompting the user to 'Enable editing to continue', a social engineering tactic to bypass security warnings and trigger the macro execution. No specific family could be identified, and no external IOCs were extracted.

Heuristics 2

  • 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.
  • 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
4184db6ce737688a710ce9c1cee7569101b446fbf0394b535f58c43b6cf90012		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 79718 bytes

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