Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 2e1ea41b40eda483…

MALICIOUS

Office (OLE) / .XLSX

141.7 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel
MD5: eaa97dd2f51e218ca3743ffddab4451a SHA-1: c46c98d8d78b772f4168ca61924ed117cf4f67de SHA-256: 2e1ea41b40eda483558b5bb13f493c45a97d3c19214d9b1f11198ef25976d4f4
140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a common technique for initial execution. ClamAV detection as 'Doc.Downloader.EmotetExcel01220-9936774-0' strongly suggests Emotet family involvement. The macro sheet is likely designed to download and execute a secondary payload, a typical Emotet behavior.

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.