Emotet Office (OLE) / .XLSX malware analysis — malicious · d0b7381be82e999b

MALICIOUS

Office (OLE) / .XLSX

141.8 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel

MD5: 466e42c1ae6b84fd2f4b0bdba17dff9f SHA-1: 397d7a07c0e90726e5340205808a97e8a7d16026 SHA-256: d0b7381be82e999bb245ff5a8435d42b89505c02af65718a64a230f2f9549009

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Doc.Downloader.EmotetExcel01220-9936774-0, strongly suggesting the Emotet family. Heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common technique for this malware family to execute code automatically. The macro sheet itself appears to be a lure, presenting blood pressure tracking data, while the underlying XLM macros are designed to initiate the malicious execution chain.

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.
ClamAV: Doc.Downloader.EmotetExcel01220-9936774-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9936774-0
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` `592af8991900f2f7058dc7ea90a33320ae293c7e541db4222a7b7f9c04f59d96`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8469 bytes

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