Emotet Office (OLE) / .XLS malware analysis — malicious · 25d4b42c98e6fb6e

MALICIOUS

Office (OLE) / .XLS

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

MD5: 0e7469287777e3d219288a423bdd22d0 SHA-1: bd1b958175f4a4890a21be740ca2954a6f999fc7 SHA-256: 25d4b42c98e6fb6ea5f91393252a446e0141074765e955b3e561d8b56454a73a

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro-enabled spreadsheet detected as Emotet by ClamAV. The presence of an Auto_Open defined name and the use of dangerous formula APIs like RUN indicate that the macro sheet is designed to execute arbitrary commands upon opening. This is a common delivery mechanism for Emotet, which typically downloads and executes further malicious payloads.

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` `5a8c99bdeb48d9fb4841ec9204e2c9ef708c0c70e96bb807734173952fc7fd55`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8133 bytes

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