Office (OLE) / .XLSX malware analysis — malicious · 4c6279917cb887d2

MALICIOUS

Office (OLE) / .XLSX

35.5 KB Created: 2020-11-27 11:38:55 Authoring application: Microsoft Excel

MD5: ce54394350e7a27d1d932d19e69d0d80 SHA-1: dd71eb98156737fc3835b8df8c833408733c3e6b SHA-256: 4c6279917cb887d28f5df1d0a22ff196a9aee3bc1f898a5c8cd8ef8a554bdaea

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell

The sample 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 malicious code upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary commands. No specific URLs or hashes were extracted, but the technique itself is highly indicative of malicious intent.

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` `0b7b604fc6e610331980c5c0610570327dfde8da701f77717e17e3bb2ed25ba8`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6869 bytes

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