Office (OLE) / .XLSX malware analysis — malicious · 7e9ce30f850e158a

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 2020-11-27 11:45:30 Authoring application: Microsoft Excel

MD5: 1585e9631ea0cdc65b27ba4177f4dd34 SHA-1: 91c9316eb755fbe35a8a887966c03ca8f469ba9e SHA-256: 7e9ce30f850e158aa9c8e31c6d46130de7280780c71985162cab884e4f8c7c72

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. While the exact payload is not discernible from the provided evidence, the Auto_Open macro is the primary mechanism for initiating the attack, likely to download and execute 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.

Filename	Kind	Source	Size
`xlm_macros.txt` `b4b1a6a09849712490ff02b8e87a2ea236b8ae0e40ea7d65cdf53527ee3523a5`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6609 bytes

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