Emotet Office (OLE) / .XLS malware analysis — malicious · f96bce11f2901a3e

MALICIOUS

Office (OLE) / .XLS

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

MD5: 371d2184528edff4f9de8a990d1c5307 SHA-1: 83148fe26ec37ff672bad6de8ffcd35d19d77633 SHA-256: f96bce11f2901a3e0a2de8b0c1757f7d6be1c444f1e071394ed0cbfd2a0a8fd5

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry point, specifically utilizing dangerous functions like RUN. ClamAV detection confirms this is a known Emotet downloader variant. The macro sheet likely contains code to download and execute 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` `85773188e79d904ef8ecf815a27f3a8200cc87e1822ab4901cc9bed29c53e636`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8156 bytes

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