Emotet Office (OLE) / .XLSX malware analysis — malicious · 51809fe19d5d3ab7

MALICIOUS

Office (OLE) / .XLSX

127.9 KB Created: 2022-01-17 21:27:03 Authoring application: Microsoft Excel

MD5: ea5c03adbf649693fb615d158606be6d SHA-1: 90b9dcc700dbb9a7a111755d793230ecd35eb7b7 SHA-256: 51809fe19d5d3ab7bcd07255eabccd915611c8844b6e551c24b76fa06999664c

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious File Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. The macro executes a command to download a payload from the URL 'http://0xc12a24f5/cc.html' or 'http://0xb907d607/cc.html'. This behavior is consistent with Emotet's typical delivery mechanism of using macro-enabled documents to download and execute further stages.

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` `a0fd1b709c0182b7bfad87bd5382ad41592e9af0d0093f5e68d1ff145f18d235`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	653 bytes

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