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

Static analysis result for SHA-256 171896ac344878f6…

MALICIOUS

Office (OLE) / .XLSX

123.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 8a8f2e1357daede11d0409d55a326f66 SHA-1: 89d2c3957e83af655b80e74163feeb58eb576ea9 SHA-256: 171896ac344878f6a2fa00752462f1d73cd10e738f466def25c27f48b558b964
362 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains an obfuscated VBA loader within a Workbook_Open macro, designed to execute a second-stage payload. The script reconstructs a list of 11 URLs, indicating an intent to download and run malicious content from external sources. The presence of CreateObject and Shell execution tokens strongly suggests the execution of downloaded malware.

Heuristics 9

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • URL reconstructed from VBA cell-staged base64 dropper (11 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.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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://harperhouseproducts.com/Merchant2/ARsf1LIcOauhH1rDrIh/
    • http://holubvideo.com/eln-images/zqqgZ0YXaPiWbF/
    • http://chastongroditski.com/eln-images/skSsC
    • http://seacupps.com/eln-images/AYvykzg/
    • http://ericandrobin.com/cgi/qRe8dRaG2HDNOOG1/
    • http://sosantiques.com/cgi/9ii/
    • https://greenlawnirrigation.net/GLI_New/JRlt3mOiezE/
    • https://on-lineventures.com/cgi/ks0Mp/
    • http://blog.logo123.com/wp-content/19G04LjA1UcE1tN8/
    • http://magicblog.tatamotors.com/wp-includes/7faN9/
    • http://intrablog.tatamotors.com/wp-includes/MGGi5zcZrkolFH9/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12808 bytes

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