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

Static analysis result for SHA-256 74c023ecd78c398e…

MALICIOUS

Office (OLE) / .DOCX

291.0 KB Created: 2017-04-21 08:28:00 Authoring application: Microsoft Office Word
MD5: 7809e177584176e9def925007146cc5c SHA-1: c9827ff0398a018ff21ebd23e3e0297d95fe1696 SHA-256: 74c023ecd78c398e4578b59986cdadd8b72d898e22142516de85d57150d9fada
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains critical heuristic firings indicating an obfuscated auto-exec VBA loader that downloads and executes a file via HTTP. The Document_Open macro is designed to clear handlers and settings before proceeding with the malicious logic. The presence of VBA macros and the critical firings strongly suggest this document is a downloader for a second-stage payload.

Heuristics 8

  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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.
  • 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/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
87d1aa26c6dd74a69721193d15d1c417ea69d62e15eda88331bc29096dccb80c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 61196 bytes

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