Emotet Office (OLE) / .XLSX malware analysis — malicious · 9296f02a362c27b1

MALICIOUS

Office (OLE) / .XLSX

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

MD5: e85aa320fc84a740efaa1e2ce533bcda SHA-1: 3967a9b469537e2d5854727020d298f37edded63 SHA-256: 9296f02a362c27b1e3a3b4119ede64ea52b6c0430fc70517e5146730c23c987d

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The critical heuristics indicate the presence of Excel 4.0 macros, specifically an Auto_Open entry, and ClamAV detection points to Emotet. The macro sheet contains an Auto_Open defined name, suggesting it executes automatically upon opening. The ClamAV signature 'Doc.Downloader.EmotetExcel01220-9937164-0' strongly suggests a downloader functionality, typical of Emotet's initial infection vector.

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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