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

Static analysis result for SHA-256 daab6c2947fbaa9c…

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-27 11:38:44 Authoring application: Microsoft Excel
MD5: 21f8167d3d59f578f73c728db4c11da1 SHA-1: 2435f0181a2e7bbc5728727368fc9aab8959610f SHA-256: daab6c2947fbaa9ca0700dc51225e79cd8ec4b120f5299ac8f502533c139b181
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is often used to execute arbitrary code upon opening the document. The presence of the Auto_Open function strongly suggests an attempt to run a malicious payload, aligning with spearphishing attachment tactics.

Heuristics 3

  • 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.
  • 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
e28e4e69b75a3305354da4ffdb365a559aea6f69e5c54b45e8503cfccd59f713		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6584 bytes

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