Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 6c51cb554d512b50…

MALICIOUS

Office (OLE) / .XLSX

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 2243f9eb9d01700957c3ae1aa4241862 SHA-1: 3b69efc2f3fb5425f06236ce7a90793f13d6c796 SHA-256: 6c51cb554d512b5015657f7126d4c451cd130cd1ac2f9e7d97a34c421e3097c6
302 Risk Score

Malware Insights

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

The critical heuristic OLE_VBA_CELL_DROPPER_URL indicates that VBA macros are used to stage and deliver URLs. The Workbook_Open macro (OLE_VBA_WBOPEN) and CreateObject call (OLE_VBA_CREATEOBJ) further suggest that the macro is designed to execute automatically and download a payload. The reconstructed URL list contains multiple suspicious domains, indicating a downloader functionality.

Heuristics 8

  • URL reconstructed from VBA cell-staged base64 dropper (12 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: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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 https://lastregaristorante.com/wp-admin/vkXFRVu/
    • http://sellin.app/wp-admin/0W4AcWvFkHkV/
    • https://dulichkhampha24.net/wp-content/rPThO/
    • http://dev.learncaraudio.com/wp-admin/ZIwWVcNiED4JYqnq/
    • http://tastedonline.com/cgi-bin/14Lg3P2Dt3rqBmaYZO/
    • http://store.anicyber.com/wp-content/0JIWtpJt681mQ/
    • http://jeffreylubin.igclout.com/wp-admin/gJ5oDbi/
    • http://karensgardentips.com/cgi-bin/w9i3PIVDOJDeF095ST/
    • http://stancewheels.com/wp-admin/ur031GNgTubBSslqN/
    • http://laohange.com/wp-content/brPqH/
    • http://139.99.89.211/wp-admin/VM1HRb3b0MGGdp/
    • http://onexone.elementor.cloud/cdrxhrt/632SFiWmT1Y/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0682b1dabb01229c8492cae5e8f124b2428b3f7af0a3adfd56447b0856c75734		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6592 bytes

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