Emotet — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 805cb6a567b584fe…

MALICIOUS

Office (OLE) / .DOC

328.1 KB Created: 2019-02-20 07:25:00 Authoring application: Microsoft Office Word
MD5: f0e27d3c7d0206185469afc8543c6307 SHA-1: 0b42c73129ac2b9c2e3ffe1b68c3aa99389875db SHA-256: 805cb6a567b584fe852805905ec1eac4121942732e4c7e0f58559b015316f400
282 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-6863642-0', indicating a known downloader. Heuristics reveal obfuscated VBA macros, including an auto-exec loader that uses GetObject and execution sinks, strongly suggesting it's designed to download and run a secondary payload. The presence of VBA macros and the known Emotet family attribution point to a spearphishing attachment attack vector.

Heuristics 8

  • 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.Emotet-6863642-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6863642-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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
f9dc5329a9a7efcc6310c51285741381ffda1277ac02f89c25e60dc85a8b6e00		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 73965 bytes

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