Emotet Office (OLE) / .XLS malware analysis — malicious · b485c81016ddd905

MALICIOUS

Office (OLE) / .XLS

96.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-07-13

MD5: f289bb668808abce6378f9e8e23f6bec SHA-1: 05535c4242ead5c46e63837dcb6657218d994199 SHA-256: b485c81016ddd90561d6d31bbc7ad889733a7a80c1570edce1309f56dd3b7de5

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, specifically calling dangerous functions like RUN. ClamAV detection further confirms this as Emotet. The Auto_Open macro is designed to execute automatically when the workbook is opened, likely to download and run a secondary payload.

Heuristics 4

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.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
ClamAV: Xls.Downloader.Emotet-ea81817e7f807ab1-9952142-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ea81817e7f807ab1-9952142-0
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` `44b7c45128c9ebff1e2d4c700363a400191ad3820db3f6fdcc49f6028eab1dc9`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8173 bytes

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