Emotet Office (OLE) / .XLSX malware analysis — malicious · 4e93c1dcd947587f

MALICIOUS

Office (OLE) / .XLSX

142.5 KB Created: 2022-01-18 14:11:14 Authoring application: Microsoft Excel

MD5: b7abd037919427beae6e7fdf5ce1d245 SHA-1: 92a36edb3d3162f1b030b82c87ad0c698d4f147f SHA-256: 4e93c1dcd947587f5eafca098b66e47c5a20fe2106e01e044249c2ecf1087a69

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature Doc.Downloader.EmotetExcel01220-9936774-0. Static analysis revealed the presence of Excel 4.0 macros, specifically an Auto_Open defined name, which is a common technique for initial execution. The macro sheet is likely responsible for downloading and executing a second-stage payload, consistent with Emotet's behavior.

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` `c355a4e8b51815f97cf3e202ab7d47ce16f5f701c419b0e7a11ef751a8ea709e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3661 bytes

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