Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 84050cc58a43aebd…

MALICIOUS

Office (OLE) / .DOCX

155.8 KB Created: 2021-01-04 18:59:00 Authoring application: Microsoft Office Word
MD5: deeb9918e6f7c5e76e1ca54c056d839b SHA-1: 516eddf053349d4de60eef8b280ed05e7df99037 SHA-256: 84050cc58a43aebd78c85392869761e0772f48740c414f586b2716f6c5a09b99
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. This macro utilizes obfuscated API calls, specifically reassembling 'Scripting.FileSystemObject', to create and write to files on the filesystem. The ClamAV detection 'Doc.Downloader.EmotetRed02224-9938637-0' strongly suggests an Emotet family infection, which commonly employs such download and execution tactics.

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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