Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 6c2a87e2fae4bdca…

MALICIOUS

Office (OLE) / .DOCX

161.4 KB Created: 2021-01-04 16:15:00 Authoring application: Microsoft Office Word
MD5: 8237cef002fe26d7d5c9033e285cff5d SHA-1: 4285c9625668d867772fda7ad8c877f170572a68 SHA-256: 6c2a87e2fae4bdca683f8d6ed210e3d9f537c9422157b3826bc829506757a524
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1105 Ingress Tool Transfer T1036 Masquerading

The sample contains a VBA macro that executes upon opening the document, as indicated by the Document_Open heuristic. The macro uses CreateObject to instantiate a Scripting.FileSystemObject, which is then used to create and write to files on the filesystem. This behavior is characteristic of downloaders that fetch and execute additional malicious payloads. The ClamAV detection name 'Doc.Downloader.EmotetRed02224-9938637-0' strongly suggests the Emotet family.

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
b7c08445609ad3b9c2a0766b1423df26453c524cbf6c8eca0da53a1732c00612		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7252 bytes

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