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

Static analysis result for SHA-256 17c3c8d7e6bfdc34…

MALICIOUS

Office (OLE) / .DOCX

200.5 KB Created: 2020-03-29 20:40:00 Authoring application: Microsoft Office Word
MD5: 8dbd7494ae3530a9cbdf92417ebd8dbb SHA-1: a697b65f0d4ecd6bd32c0594d0ec1711bc19e554 SHA-256: 17c3c8d7e6bfdc346e9f3b1109893d9376510fedc42039d8c57fcf111a646ef7
350 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is a malicious Microsoft Word document that leverages the CVE-2007-3899 vulnerability to achieve arbitrary code execution. It contains an obfuscated VBA macro that uses CreateObject and ShellExecute API calls, indicating an intent to download and execute a secondary payload. The Document_Open macro is automatically executed upon opening the document.

Heuristics 10

  • CVE-2007-3899 — Microsoft Word malformed string memory corruption critical CVE likely CVE_2007_3899
    Word OLE document has the MS07-060 malformed-string exploit shape: a Word 97-family FIB points to a malformed DOP/string-table region with an abnormal INT_MAX run, inflated text counters, and exploit payload or Mdropper.Z campaign evidence.
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
bd0dad438d4c922ab52ea03896920e6b4218e0254617424fc0cd834d4d0be00a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6705 bytes

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