Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 e9b8008471fe66ae…

MALICIOUS

Office (OLE) / .XLS

108.2 KB Created: 2022-01-22 10:28:51 Authoring application: Microsoft Excel
MD5: da67624cebab29a67eb7b06402d67449 SHA-1: 083e26935c61eac421a24761fc5b5aa2b7643a9e SHA-256: e9b8008471fe66ae9cf995345039da5fe0dcba2f5e7aaceb8059737eb3d0a1bd
140 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 defined name, a common technique for initial execution. ClamAV detection explicitly names this sample as 'Xls.Downloader.Emotet'. The macro sheet itself is truncated, but the presence of Auto_Open suggests the intent is to download and execute a secondary payload, consistent with Emotet's 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: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0
  • 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
4282a66cb39a54151a7150b41c26dfb71d035cb8ac904f3e031d21c44da4ada6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3523 bytes

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