Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 09d365a4cf19d48c…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: f1a8792dad055d207c74774d27df861d SHA-1: 10f0c392de0819bd729663f469c556452310e534 SHA-256: 09d365a4cf19d48cdfb474caae0ca8a173cf45b5a3214dbc6089a7c7cdc2df28
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV and contains a Workbook_Open VBA macro that executes a second-stage payload. The macro uses CreateObject to interact with the system and constructs an obfuscated PowerShell command to download and execute files from multiple URLs. The presence of Emotet-related heuristics and the download mechanism strongly suggest this family.

Heuristics 5

  • ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12041 bytes
vbaProject_00.bin
ec83cdcaebab249d240c6d0221fab4a6d577d710a91bafc6565c934ba495dede		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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