Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 742d7fb297d4b065…

MALICIOUS

Office (OLE) / .DOCX

164.9 KB Created: 2021-01-05 07:28:00 Authoring application: Microsoft Office Word
MD5: cbe43244fd93a57d1b2e8fe6cb4004c9 SHA-1: 3dc5e3e7d00eb75857f4bfec115c442404613ccd SHA-256: 742d7fb297d4b065534d4a387ed7cdefc37b87f63e8b920020a6b08c48abd5bd
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a heavily obfuscated VBA macro that executes upon opening the document. This macro utilizes CreateObject to interact with the FileSystemObject, attempting to write files to specific locations. The ClamAV detection name 'Doc.Downloader.EmotetRed02224-9938637-0' strongly suggests Emotet family involvement and a downloader functionality. The obfuscated nature and the use of FileSystemObject point to a second-stage payload download.

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.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
  • 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
a19bea0b68e66c642d89ca357193de473f2db600ca0ce526dc79ce8aaabe41a9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10612 bytes

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