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

Static analysis result for SHA-256 050915aaae652d7b…

MALICIOUS

Office (OLE) / .XLSX

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 5380a9caf8382b4c493776d49a9cd3c6 SHA-1: ba7992a38f2dee9f2aa2ce54683c9feeee140b5c SHA-256: 050915aaae652d7b0357a1bb4de4d92fe6a69e9308fbd27d0410acf5dc38f10f
302 Risk Score

Malware Insights

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

The sample contains VBA macros that trigger on workbook open, indicative of malicious intent. The macros reconstruct and attempt to download payloads from multiple URLs, including 'http://tastedonline.com/cgi-bin/14Lg3P2Dt3rqBmaYZO/'. This behavior is consistent with a downloader or droppper, likely delivered via spearphishing.

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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