Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 738282eb7cc063af…

MALICIOUS

Office (OLE)

185.3 KB Created: 2020-09-15 11:47:00 Authoring application: Microsoft Office Word
MD5: f39c267f649d78997c59e723461dfba0 SHA-1: 6b7958588051a5021c410fa93e4092a9a65fde0f SHA-256: 738282eb7cc063af9334cbb625bf13105ed6f56a48a6bbd0d39a937500087844
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 VBA macros, including a Document_Open auto-execution macro, which is a common technique for Emotet. A critical heuristic indicates an obfuscated PowerShell stager within a hidden UserForm, suggesting it's designed to download and execute a secondary payload. The ClamAV detection name further supports the Emotet family attribution.

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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