Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 61e7a5bc6dda4cdf…

MALICIOUS

Office (OLE) / .XLSX

73.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-18
MD5: d8f46c46975e458f2019c27e8406911c SHA-1: a88aa9a6b6ad91bd37d78d9341f49ad632b31ef0 SHA-256: 61e7a5bc6dda4cdf7d6c21edbabc61b22a616014d8648a8d43a83d03f5d75d61
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open entry, which is a strong indicator of malicious intent. The macros are designed to construct and download a payload from multiple hardcoded URLs, including 'http://lysarborpaysage.fr/headers/ZZrBWaHoT0k/'. This behavior is characteristic of downloader malware, and the ClamAV signature specifically identifies it as Emotet.

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-ea85857e7e81817a-9950241-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ea85857e7e81817a-9950241-0
  • 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
cde40ac8101f526fd4a9300ec8b1668ace4e30df6493fc373c611b3342d60d83		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7173 bytes

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