Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b8c96327b7e09792…

MALICIOUS

Office (OLE)

3.10 MB Created: 2003-12-28 17:25:19 Authoring application: Microsoft Excel
MD5: aabf40cb9e477c34860ea3db121565c9 SHA-1: 1ba4bce93a62d962e521abf29fb081422f66e331 SHA-256: b8c96327b7e097920153685373cdcd752c078c8f254081af6fc4c0971a1db79e
188 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment T1059.001 PowerShell

The file is an Excel document containing a malicious VBA macro. The Workbook_Open event is triggered upon opening, which is a common technique for executing malicious code. The macro uses CreateObject, indicating it's likely attempting to download and execute a second-stage payload. The presence of obfuscated VBA code and the auto-execution of Workbook_Open strongly suggest malicious intent. The embedded URL is noted but has an unknown reputation.

Heuristics 7

  • 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.eca.gov.uk

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c07d0ca2ca9c62d48aa29fecbf8dcf223aa86be4c59618043b6edd6b83cfddbd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1295499 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 74 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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