Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 6648d3f2bfd06611…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: c28e8bb34ddf4e598ce6af78efcd1b3b SHA-1: f52d16f12e975c97d86aeb2f31b48888e7ccbe39 SHA-256: 6648d3f2bfd066112e0b7337fcfd159c68de7ea8176f71ac615007589834d337
302 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for Emotet. The macros are designed to reconstruct and download payloads from multiple URLs, including 'http://lbsbriefs.com/cgi/2kl8X826xEKeuhI/'. The presence of CreateObject and Wscript.Shell heuristics, along with the embedded URLs and the ClamAV detection name 'Xls.Downloader.Emotet', strongly indicate Emotet activity. The script also attempts to drop files to 'c:\programdata\tjspowj.vbs' and 'c:\programdata\uidpjewl.bat'.

Heuristics 8

  • URL reconstructed from VBA cell-staged base64 dropper (7 URLs) critical OLE_VBA_CELL_DROPPER_URL
    VBA reads worksheet cells, strips junk substrings via Replace(), and base64/UTF-16 decodes the result into a PowerShell EncodedCommand payload. The download URL is never contiguous in the file bytes; it was recovered by removing the macro's Replace() junk tokens from the cell strings and decoding the staged base64.
  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lbsbriefs.com/cgi/2kl8X826xEKeuhI/
    • http://howebeautiful.com/eln-images/tyj208/
    • http://lazylargomotels.com/cgi/wZrYbJ/
    • http://sleepstarlite-ozark.com/batesville/UjX/
    • http://osaka.musicaldog.com/05-set/YLBOd/
    • https://egemenrulman.com/Fox-C404/qrr2OCShGJGH06Gm/
    • http://skyridgedesigns.com/eln-images/38pr2cu3xt2Ai/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13985 bytes

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