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

Static analysis result for SHA-256 6b7169e1405cbfde…

MALICIOUS

Office (OLE) / .DOCX

160.5 KB Created: 2020-09-23 12:48:00 Authoring application: Microsoft Office Word
MD5: 4660e1f822a499dab68d89ef852eb8af SHA-1: 3ab6001e7a573ee6ada3abcb9619de7dd193ed46 SHA-256: 6b7169e1405cbfde9ecf5e41b1fda35ad6727c74121fc498048ad01e905d51de
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample contains a VBA macro that is automatically executed upon opening the document, as indicated by the Document_Open and CreateObject firings. The ClamAV detection name 'Doc.Downloader.Generic-9765533-0' strongly suggests the macro's purpose is to download and execute a secondary payload. The VBA code itself is heavily obfuscated, making it difficult to determine the exact download URL or execution method.

Heuristics 6

  • ClamAV: Doc.Downloader.Generic-9765533-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9765533-0
  • 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
  • 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
b40b6439e0e94acfcf6292a727f89f3b7b0e2a6faeddd230541e1164d0603753		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19346 bytes

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