Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 0d75c6d6ea01df81…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 4c96678817814b561c7e6cace74bc2df SHA-1: a64f91eea69f235adf2ba92fc381b63b02506165 SHA-256: 0d75c6d6ea01df817b2aed33fc6ee1ddf64fdfe63b2d56894b656a6bd13a47c0
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The critical ClamAV heuristic identifies this file as Emotet, a known downloader. The presence of a Workbook_Open macro and CreateObject calls, along with the VBA p-code auto-execution, strongly indicates malicious intent. The script attempts to download a second-stage payload from multiple URLs, including 'http://sumedhaonline.com/wp-content/hYnJX30XQFEVcBSRH/', and save it as 'c:\programdata\jledshf.bat'.

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
1e230a6f7a8876885ae0f1fcb1b70976f4ddadd5eb85d22101da412b4c16cb11		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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