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

Static analysis result for SHA-256 5ef904a4dde48243…

MALICIOUS

Office (OLE) / .XLSX

145.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 6c87b7b23b5ccfac5a61a257fe2cc61b SHA-1: 7cdf74e77c252b14db3245ba6a45eca4ac157942 SHA-256: 5ef904a4dde48243a9b3965b61bfc85c2f9b2d9f4ab677e9942e303387286650
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros that are automatically executed upon opening. These macros are designed to reconstruct and download payloads from a list of 12 embedded URLs, indicating an Ingress Tool Transfer (T1105) attack pattern. The use of VBA macros points to the Visual Basic (T1059.005) technique. Given the nature of malicious documents delivered via email, Spearphishing Attachment (T1566.001) is also a likely initial access vector.

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.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
  • 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://reumatismclinic.com/-/scCnm3mbJRpsaBKBbrC/
    • https://shodhmanjari.com/wp-admin/xjEmK4Pd3N/
    • http://tubelocal.net/wp-admin/X4Xm4Mk/
    • https://pacifichomebroker.com/roderick/RRk/
    • https://molinai-journal
    • https://marineboyrecords.com/font-awesome/QBBByHDDYl0slxlQ/
    • https://mashuk.net/wp-includes/ej6R4fkU/
    • https://lapalette.store/Fox-C404/Gngia6hD0i5zsgd2/
    • https://jhonnycryptic.com/cgi-bin/OhZdKCDRBYGZudqs/
    • https://korean911.com/wp-admin/TZczIsZtMFXxM5T/
    • https://fonijuk.org/wp-content/fzq6vYFUMEiRoR8vG/
    • https://baltoe.blog/-/6IC/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7821 bytes

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