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

Static analysis result for SHA-256 614aadeb58e08ab8…

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-27 11:44:22 Authoring application: Microsoft Excel
MD5: bf7c2c2aabafea06a74448c90c26ec24 SHA-1: b5306495ad4323f70978cd3b97caf9749194e013 SHA-256: 614aadeb58e08ab8bbd171ad601994b83d24a9db8cd3912523d3958e21027f1a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the workbook is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN suggests the macro attempts to execute commands, likely for downloading and executing a secondary payload. No specific family could be identified.

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
4530e1eba5e1bc4018cf497653947bf3be816cd736903bb74a2068abe7775149		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6886 bytes

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