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

Static analysis result for SHA-256 eed47e4239c6a288…

MALICIOUS

Office (OLE) / .XLA

1.55 MB Created: 2009-02-25 12:43:17 Authoring application: Microsoft Excel
MD5: 82cedb84944db6229a0dc589e29a88f1 SHA-1: 94627ab7129b1790664c7997652d67db7cc42a42 SHA-256: eed47e4239c6a2881295c248c22bed6e88a20ea268a8bbe7eed0be5ba228df2e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1547.001 Registry Run Keys / Startup Folder

The file is an Excel XLA add-in containing a large VBA macro. Heuristics indicate the presence of a Workbook_Open macro that uses CreateObject and references Windows Script Host, suggesting it attempts to execute code. The macro source file 'macros.bas' was extracted. While no specific malicious URLs or commands were directly reconstructed from the provided evidence, the combination of these indicators strongly suggests a downloader or dropper functionality.

Heuristics 7

  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://cbr.ru/currency_base/daily.aspx?C_month=
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/exif/1.0/
    • http://ns.adobe.com/tiff/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
cd5601e472de94d1ac06cf8d4022d75b24b011870346b0f754d71da4035ef2a5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 221203 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 25 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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