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

Static analysis result for SHA-256 7338e429920b6d5f…

MALICIOUS

Office (OLE) / .XLS

501.0 KB Created: 2010-05-25 11:09:35 Authoring application: Microsoft Excel
MD5: 91cc3edea568e390f963e009a7cb328d SHA-1: 974d9c977b221e5b4848f30d225c916c720a2e95 SHA-256: 7338e429920b6d5fa7f68ea55a759ef50fd50be7c83ab2819bd12d22992b8fbe
190 Risk Score

Malware Insights

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

The Excel file contains a Workbook_Open VBA macro that is designed to delete worksheets and potentially execute further actions. The presence of CreateObject and ShellExecute API calls suggests the macro is capable of launching external processes or downloading additional malicious content. The macro's obfuscated nature and the deletion of other worksheets point towards a downloader or initial execution stage of a larger attack.

Heuristics 7

  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://www.exceltip.com/st/Copy_modules_from_one_workbook_to_another_using_VBA_in_Microsoft_Excel/501.html
    • http://www.excelguru.ca/node/21#MultiSingle
    • http://sourceforge.net/projects/pdfcreator/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a490f89476cb6fe330cff01330e79bf54477a5807de40f63605c401cb5f252e9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 162352 bytes

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