Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 122ea593c26dc185…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: e300ec8ff606bb6568d95d0a2d836504 SHA-1: c018927f8221bdb1ef6794396e40a29a162beddd SHA-256: 122ea593c26dc185cce96477b8eb264f45eff2fca2b3628b5d7f548de86cb501
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is an Excel document containing VBA macros, specifically a Workbook_Open macro that utilizes CreateObject to execute a batch file and a VBScript. The script attempts to download and execute payloads from multiple URLs, including a PowerShell command encoded with Base64. The presence of a Workbook_Open macro and the observed download/execution behavior are characteristic of the Emotet 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
8857a65dd2470f4f752bca76adbe4ae108216e162f268fed52cfbf43d44c9724		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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