Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 da89a4712f34b666…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:38 Authoring application: Microsoft Excel
MD5: 1ad490ebf8dc0c558b50ba8dc5fc60ba SHA-1: 8deda3c7be9508439544640a3559447b7b4a7e0e SHA-256: da89a4712f34b66615fd65ca49c8a19fcc6238e3b9226d70ad2934b63067506a
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros. The presence of an 'Auto_Open' defined name indicates that the macro will execute automatically when the workbook is opened. Critical heuristics indicate the use of dangerous formula APIs, suggesting the macro is intended to perform malicious actions, such as downloading and executing a second-stage payload.

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
300b23658174e0158ba45a8156723dda4f8597abf34c4b7b89da9966a60cb34a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6777 bytes

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