Emotet — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 0be9d6cb334fc62f…

MALICIOUS

Office (OOXML) / .DOC

88.0 KB Created: 2021-12-08 18:15:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: b8707407860c79814efd0406a25b5e08 SHA-1: 2f705d84ebc30b2899f4d1a6d6bf935aea529e88 SHA-256: 0be9d6cb334fc62f10b751c241c8f21645a12c17e1ad1ef4439a9ca0ef278ebb
202 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is a malicious OOXML document containing VBA macros. The 'autoopen' macro is triggered upon opening, which uses 'CreateObject' to execute a command. This command is constructed by reversing a string derived from the document's keywords property and prepending 'c:\windows\explorer '. The ClamAV detection name 'Doc.Downloader.EmotetUpdate122100-9914334-1' strongly suggests the Emotet family and a downloader functionality.

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
  • 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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
vbaProject_00.bin
7fcf6042099974efcce9ccb0c30bb4b0315a9924479bd7c4cb571ba39cc68e04		 vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes

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