Emotet Office (OLE) / .XLS malware analysis — malicious · 32e843c35f0b39a4

MALICIOUS

Office (OLE) / .XLS

141.0 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel First seen: 2022-03-16

MD5: 16d6324c58bdeb875f3102bcc55a87e6 SHA-1: 049c03597aa88654de8672990fc02a1b8c23d24b SHA-256: 32e843c35f0b39a4ff9d669a80da88322cdd4206caa24710e7fbe60db710597f

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', indicating it's a known Emotet downloader variant. The presence of an Excel 4.0 Auto_Open macro confirms the execution mechanism. The document body, while appearing benign as a blood pressure tracker, is a lure to disguise the malicious macro's presence and 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.
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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