Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 77151a31805014e0…

MALICIOUS

Office (OLE) / .XLS

142.0 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel
MD5: a1279864580d5f29c9730cd3aae2ffdb SHA-1: 80173c2e0554da5152a9c3c649bce3fb5b34efb3 SHA-256: 77151a31805014e0dc372a02bdabcbe7cee6ce3eaa1cfe9646290a6969581666
140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel01220-9936774-0', indicating it's a downloader. Heuristics confirm the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common execution vector for Emotet. The macro sheet likely contains code to download and execute a secondary payload.

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.

FilenameKindSourceSize
xlm_macros.txt
592af8991900f2f7058dc7ea90a33320ae293c7e541db4222a7b7f9c04f59d96		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8469 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.