Emotet Office (OLE) / .XLSX malware analysis — malicious · 95141c557c2da97c

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 0c890caa5574298838e2463f2a9eec1f SHA-1: 84616f046e7b29279d4a5af740b8524cd1b02a6e SHA-256: 95141c557c2da97c647844e7c27133e0f8ba49907e167088ad774ed57e950294

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, a common technique for Emotet. The ClamAV signature further supports the Emotet family attribution. The macro sheet is truncated, but the presence of an Auto_Open entry strongly suggests the execution of malicious code upon opening the document, likely for downloading 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.
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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