Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 141775cdc589d1b9…

MALICIOUS

Office (OLE) / .DOCX

162.5 KB Created: 2021-01-04 16:15:00 Authoring application: Microsoft Office Word
MD5: e9e5fa243841f5ffb787b3288a6e70e2 SHA-1: 6083d57c412926bcb4ddf97b217aaed3b2c99b7d SHA-256: 141775cdc589d1b9f0fe3a80d1385dc5b8f4ee9953379a3022bef1cacbf64630
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a VBA macro that is automatically executed upon opening the document, as indicated by the Document_Open heuristic. This macro utilizes CreateObject to instantiate 'Scripting.FileSystemObject', a technique often used to write files to disk. The script attempts to create multiple files with specific names and paths, such as 'X:\LuIIO\zUSvuJZ.anUcEiFX', suggesting it's designed to download and execute a second-stage payload. 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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