Emotet — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 127948106f61a246…

MALICIOUS

Office (OLE) / .DOC

179.0 KB Created: 2019-04-12 11:40:00 Authoring application: Microsoft Office Word
MD5: 6c87badf724819f274e93ecfc270edcd SHA-1: 211167350dd5f8b55d08c3240ee2995a0bbe236f SHA-256: 127948106f61a246ed0ba5e5bb69cc0776181b0d586d81122aeed066f01cf055
322 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros with an AutoOpen function that triggers execution. Critical heuristics indicate the use of WMI (Win32_Process.Create) and obfuscated API names like 'winmgmts' to launch processes. ClamAV detection confirms this is a known Emotet downloader variant. The VBA script is heavily obfuscated but the presence of WMI process creation strongly suggests it's designed to download and execute a secondary payload.

Heuristics 8

  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • ClamAV: Doc.Downloader.Emotet-6939138-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6939138-0
  • 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.
  • 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
5e26046ea48eb5191e287e04226300be83883a30c1e2f2752f2fc94d79879cc1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 32797 bytes

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