Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 6a90c70e9110dd3a…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 0a7c9221f1af98df02bd76b7b33fe359 SHA-1: e6fa6329874069dc2b929d3ccfca0dc59b07f101 SHA-256: 6a90c70e9110dd3a29dcaf60a05a800e1e1ec344a92750e2ff61efc86e72135b
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a Workbook_Open VBA macro that uses CreateObject to execute a batch file and a VBScript. The embedded VBA script also constructs and executes a highly obfuscated PowerShell command which attempts to download a payload from multiple URLs. The ClamAV detection name 'Xls.Downloader.EmotetExcel02223-9938902-0' strongly suggests 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
d2a41c4b57bc379ca261e8b8cb6558e68a84e42d9cdd5e97851c757530f50356		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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