Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 6106e7bb64153b6d…

MALICIOUS

Office (OLE) / .XLS

95.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-07-08
MD5: f0b2fac71fc180e76df52933831c45f5 SHA-1: 8c6468d5bc4d599149c686135f492ba14c8ef133 SHA-256: 6106e7bb64153b6df89f693a4bce8a72f3f8f963b58f6727a0ba7ffaad69997b
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is an Excel XLS document containing Excel 4.0 macros, specifically an Auto_Open macro. Heuristics indicate the use of dangerous formula APIs, including a RUN function, suggesting the macro is designed to execute arbitrary code. ClamAV detection confirms this as Emotet, a known downloader family. The presence of an Auto_Open macro strongly implies it's intended to be delivered as a spearphishing attachment.

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.

FilenameKindSourceSize
xlm_macros.txt
b4fd08f08415b9a54a9c42e6e443fe998a6e6f4b669ae6dde6ded55374dc9407		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8156 bytes

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