Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 658cd638a354d000…

MALICIOUS

Office (OLE)

234.4 KB Created: 2020-08-14 21:43:00 Authoring application: Microsoft Office Word
MD5: bc23d8cbf4e3524ff5181a6ea063e583 SHA-1: dc6be28d720cff835d5ce60806276f0e2355729d SHA-256: 658cd638a354d000aeca0864435406c0da77afa3599ed53d798a11c0a6b91ccd
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample contains VBA macros, specifically a Document_Open macro that utilizes a hidden UserForm for command staging. This technique, combined with the ClamAV detection of 'Doc.Downloader.Emotet-9348583-0', strongly suggests Emotet activity. The VBA code is heavily obfuscated, indicating an attempt to deobfuscate and execute a second-stage payload.

Heuristics 7

  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • ClamAV: Doc.Downloader.Emotet-9348583-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9348583-0
  • 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
34c0de223fb155b200470dd74532eb17cc8088993a15437bad69cdda5f3fc0cc		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7690 bytes

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