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

Static analysis result for SHA-256 6199ffa98847845b…

MALICIOUS

Office (OLE) / .XLSX

145.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: c59940cd667deae6aaae05d92ead4bde SHA-1: 2dd656c7006b48a227b27daa2c14bd1233565647 SHA-256: 6199ffa98847845b416fe31b87841869a59e720159c4dd7aa31c37dcf4831eda
302 Risk Score

Malware Insights

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

The Workbook_Open macro is designed to execute automatically when the spreadsheet is opened. It utilizes CreateObject to interact with the Windows Script Host and the Scripting.FileSystemObject to download and execute a payload from one of the 12 embedded URLs. The reconstructed URL for the payload download is 'http://reumatismclinic.com/-/scCnm3mbJRpsaBKBbrC/'. This indicates a macro-based downloader attempting to fetch and run a second-stage malicious file.

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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