Emotet — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 3b8b1b6d67f96e2a…

MALICIOUS

Office (OOXML) / .DOC

88.0 KB Created: 2021-12-08 18:15:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 6aef8b5a057989b22c30708e89fb5c34 SHA-1: 926a238c95555764fe2aff12095fdc7cffd38818 SHA-256: 3b8b1b6d67f96e2a8ffe58449d0360eb577a46dcedb376d01d0f925c3e6fe857
202 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetUpdate122100-9914334-1'. The presence of an AutoOpen macro and a CreateObject call strongly suggests malicious intent. The VBA script reconstructs the string 'c:\windows\explorer ' and uses it to execute a command, likely to download and run a second-stage payload. The document body contains obfuscated text that appears to be a lure related to YouTube content, intended to prompt the user to enable macros.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetUpdate122100-9914334-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetUpdate122100-9914334-1
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
446de911192ce6c25ce4bd5ae51b56b73f1b91e83cb9f41cc004c7c587af3a58		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 978 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
7fcf6042099974efcce9ccb0c30bb4b0315a9924479bd7c4cb571ba39cc68e04		 vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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