Malicious Office (OLE) / .DOCX — malware analysis report

Static analysis result for SHA-256 0614f4be806c4157…

MALICIOUS

Office (OLE) / .DOCX

161.8 KB Created: 2021-01-04 16:15:00 Authoring application: Microsoft Office Word
MD5: 425cc1e5fad1770240b1edcb42378391 SHA-1: 37eb48223111354a72cb069656a7b9ff02496f21 SHA-256: 0614f4be806c4157708ed39928754468081f972f73b31c990e9b66f3bba05c4d
262 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically a Document_Open macro that is triggered upon opening the document. This macro utilizes obfuscated API calls, including the reassembly of 'Scripting.FileSystemObject', to create and write to files on the filesystem. The ClamAV detection 'Doc.Downloader.EmotetRed02224-9938637-0' suggests a downloader functionality, likely to fetch additional malicious payloads.

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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