Emotet Office (OLE) / .XLSX malware analysis — malicious · ca05bad9c4b82885

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 75763acecabda27f51fe83adfacea440 SHA-1: 2401fcaa0f0495000b94ae560d7e8d389c8ca87d SHA-256: ca05bad9c4b82885c0b8a44fcf5dfac611f3f062d8850f504fc056d49431dafe

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator. The macro attempts to execute a command using 'mshta' to download a payload from the URL 'http://0xc12a24f5/cc.html'. The ClamAV detection further confirms its malicious nature, identifying it as 'Doc.Downloader.EmotetExcel01220-9936774-0'. The script's intent is to download and execute 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` `a0fd1b709c0182b7bfad87bd5382ad41592e9af0d0093f5e68d1ff145f18d235`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	653 bytes

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