Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 63162fe833789ed9…

MALICIOUS

Office (OLE) / .DOCX

155.8 KB Created: 2021-01-04 18:59:00 Authoring application: Microsoft Office Word
MD5: faf2165619d1daa46b0d172147a52541 SHA-1: 3340fd3b0d35b7632313e442233529ad2f659a68 SHA-256: 63162fe833789ed99b85cf9524ce3254d7f676c2a187f7e2c2ecd23ad59ac5c0
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1036 Masquerading

The sample contains VBA macros, including a Document_Open auto-execution macro, which is a common technique for Emotet. The macro uses obfuscation, reassembling the string 'Scripting.FileSystemObject' to create file system objects. It then proceeds to create and write to files on the local system, indicating a downloader or dropper functionality.

Heuristics 7

  • 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.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
  • 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
28e0aab9def1820176582f12126397a14f2c858209766b704c735ce1d1db4cc2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7154 bytes

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