Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 8951fc1455e77e90…

MALICIOUS

Office (OLE)

232.4 KB Created: 2020-08-14 19:54:00 Authoring application: Microsoft Office Word
MD5: 000a0a2dec0a1b3fde79fda034779dc1 SHA-1: 0eeff7ce542534e6114358ed455a815c6e2e7494 SHA-256: 8951fc1455e77e90946e024fcd5b844500023c8102f404cc69b312d6b2c1e2b6
300 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains a VBA macro that utilizes a hidden UserForm and a command stager, a known technique for Emotet. The macro is auto-executing via the Document_Open event and uses CreateObject to initiate execution. ClamAV also identifies the file as 'Doc.Downloader.Emotet-9343215-0', strongly suggesting Emotet family attribution. The primary function appears to be downloading and executing a second-stage payload.

Heuristics 8

  • 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-9343215-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9343215-0
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
4b0a78118ae568a9116b2d22e79ca63ea488f6f6c4ff3800cb272825913d5d5c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8149 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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