Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 17c5546960d533b0…

MALICIOUS

Office (OLE)

186.3 KB Created: 2020-09-15 11:47:00 Authoring application: Microsoft Office Word
MD5: 01fd2c314257584d4265c6d20c59a497 SHA-1: a3c863ef4bb0008dcdb60ac6793bd323d9ad71c8 SHA-256: 17c5546960d533b0df0defcf3c6a1db50d0ec10ebcdc9de157d9e40eb0c0d9f3
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a critical heuristic for an obfuscated PowerShell stager within a UserForm, triggered by a Document_Open macro. This indicates a macro-based dropper designed to download and execute a secondary payload. The ClamAV detection name further supports the Emotet family attribution and its dropper functionality.

Heuristics 7

  • Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL
    OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
  • ClamAV: Doc.Dropper.EmotetWinMob0920-9636503-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.EmotetWinMob0920-9636503-0
  • 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
b8e07f1a26e378ad66aa45e874b33eb98cd646ec4a53c9d43f1763af1b17616f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22982 bytes

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