Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 13a067e93915d47a…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: e26da60b142c08aea6b9c59aa2a4e91c SHA-1: 8079384e4d32e3dfc69f4f2c51a768f9624ff604 SHA-256: 13a067e93915d47af65ec9287cda25f054f64f56d7e635f80a9d310b14b8155e
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros, including a Workbook_Open auto-execution macro, which is a common characteristic of Emotet. The script attempts to download and execute a second-stage payload using obfuscated commands, including a PowerShell command that constructs a URL from concatenated strings: 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBS RH/ ,http://divachintexiles.com/wp-inc ludes/WBhWRKs8Kv6N F m6/,http://hotelalandmalaabl.com/1520/bUdhE Pdf/,http://shwenantawin.com/copma/XTnZiI02vfgV'. It also creates batch and VBScript files in the programdata directory.

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
01e7a478d4c0d9a1284989d828686c7a1804838588ed940412fa9660acbe6d8d		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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