Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 6a711b0a2af8ed8f…

MALICIOUS

Office (OLE) / .XLS

95.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-07-04
MD5: 63acb4b13f838ab5231424537ce0cf7e SHA-1: f7d60e540fda2e62f9cb1a8ccde6f6e8a4e4eb30 SHA-256: 6a711b0a2af8ed8f70dfc2c3f2a94056b83ec198edd2beb66642e9195f98f79f
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code. ClamAV detection identifies it as 'Xls.Downloader.Emotet', strongly suggesting the Emotet family and a downloader functionality. The macro's use of dangerous formula APIs like RUN indicates it is intended to execute external code, likely downloading a second-stage payload.

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
af7e08eb74381f391d59ad043f1ef517fa450a796c57fe61d66c86ac41aaa1e8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8147 bytes

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