Emotet Office (OLE) / .XLS malware analysis — malicious · 9882e1e0f5e69867

MALICIOUS

Office (OLE) / .XLS

70.3 KB Created: 2022-01-20 19:00:43 Authoring application: Microsoft Excel

MD5: 63d7b15632a48aec697f8345f7bd3112 SHA-1: 69f94306f10326cd46074dcbf7e9d6104e3c3be8 SHA-256: 9882e1e0f5e69867dd9c7c91aecb02792252e680de7b4c64941d0eae0e43542b

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristics indicate the presence of an Excel 4.0 macro sheet with an Auto_Open defined name, a common technique for initial execution. ClamAV detection further confirms its malicious nature, identifying it as Emotet. The XLM macro sheet likely contains code to download and execute a second-stage payload, consistent with Emotet's typical 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.EmotetExcel01220-9937164-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9937164-0
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` `7f1f89a8b36a750dced08313a4e4f056192a6eac7194357c673dbbd2670a1a18`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4219 bytes

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