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

Static analysis result for SHA-256 a6c83b91ed5d47fa…

MALICIOUS

Office (OLE) / .XLS

487.0 KB Created: 2010-05-25 11:09:35 Authoring application: Microsoft Excel
MD5: 91d4142c48caf87dfc33c0b258cf992d SHA-1: 637dc9ed7c49eae0bca4740f38b29de7b65f7692 SHA-256: a6c83b91ed5d47fa6098567733123d357f126cb0ed7bdd288ed6f551fd5bd71c
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an Excel file containing a Workbook_Open macro that uses CreateObject to execute arbitrary code. The macro is obfuscated and uses VBA p-code auto-execution, indicating a malicious intent to run commands. The presence of embedded URLs suggests potential download or redirection capabilities, although their reputation is unknown.

Heuristics 8

  • 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.
  • 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
  • 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
140aa21f335de66cb8d84428d9ab0ba4504f124ab98aa8b621206879805db1e5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 163273 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 shell/COM execution token(s). Carved artifact contains 15 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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