Office (OLE) / .XLSX malware analysis — malicious · d9b854a425d7d726

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 2020-11-27 11:44:11 Authoring application: Microsoft Excel

MD5: 905603e5ed5c1642ed8a7885b111c57d SHA-1: 294b823937bd70f5328da16c40b353148f9c573a SHA-256: d9b854a425d7d7262e56d1b3f7b80ab9cba0c5ae5550eb50a77fda1ab758d772

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function. This function is designed to execute arbitrary commands upon opening the workbook. The presence of 'RUN=0' in the heuristic firing indicates the macro is configured to run external programs. While no specific URLs or hashes were extracted, the Auto_Open macro itself is a high-confidence indicator of malicious intent for initial payload execution.

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.

Filename	Kind	Source	Size
`xlm_macros.txt` `0eca78071d2559edb1b52b7a6887ac87828e4fdadcdceb0ab0df5915d22585a7`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6620 bytes

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