Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b8296e38d3df9f00…

MALICIOUS

Office (OLE)

167.7 KB Created: 2019-10-23 12:57:00 Authoring application: Microsoft Office Word
MD5: ce7803c809232ef1510e1936407119ab SHA-1: 2930584d42b1aeb431fd54231e820466820f6a7f SHA-256: b8296e38d3df9f00efb960deba274ec043c785bcd5eaef7c4dcbceb69ef97232
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Decode Files or Information

The file contains heavily obfuscated VBA macros, including an AutoOpen function, which is a common technique for malware execution. Heuristics indicate an obfuscated auto-exec loader that uses CreateObject and execution sinks. ClamAV also detected it as a generic downloader. The VBA script's primary function appears to be downloading and executing a second-stage payload, though the specific URL is not directly extractable due to obfuscation.

Heuristics 7

  • 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.
  • ClamAV: Doc.Downloader.Generic-7353638-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7353638-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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
  • 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
4fe3ed1e4796d90ccb9422a80dadb7ef1bcb4bc2a2476e8d54f3901eb317e914		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 30659 bytes

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