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

Static analysis result for SHA-256 e7e35668194b97fd…

MALICIOUS

Office (OLE) / .XLS

520.0 KB Created: 2006-12-06 16:10:34 Authoring application: Microsoft Excel
MD5: 1b8f6776e13d6d3b16710de7eba3c0da SHA-1: 783b0b6a10a6b04b9a128577b3b6cc1922cc12f1 SHA-256: e7e35668194b97fd0ce132d10e681c942aaf578cf1bfd2d820ab2116210b539e
148 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing a large VBA macro. Heuristics indicate the macro uses CreateObject and executes p-code upon opening, suggesting it's designed to run malicious commands. The presence of 'macros.bas' and the 'OLE_VBA_MACROS' firing confirm the macro's existence. While the document body contains seemingly benign text related to version history and calculations, the macro's behavior points to a downloader or executioner of further malicious content. No specific family could be identified.

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.j-walk.com/ss/excel/tips/tip96.htm
    • http://groups.google.ca/group/microsoft.public.excel.programming/browse_thread/thread/5d00ccc74d2df538/3a3e1d5569ed687e?lnk=gst&q=find+file+size#3a3e1d5569ed687e

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
42696a4480bb6c4c75309c7ec6f2d3bcdf7983cd0d957d91d3a74ab5ae31789b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 225276 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 50 Chr/ChrW string-construction calls.

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