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

Static analysis result for SHA-256 8852e60e66a34f9b…

MALICIOUS

Office (OOXML) / .DOCX

265.2 KB Created: 2020-03-19 09:02:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: 0047b42c24e8f009de9420255848ee9d SHA-1: ecf9fc1a4fe8f2811481ea5f296a21e86594ded7 SHA-256: 8852e60e66a34f9b1ab39855178332ab5bc6e28194c005b13bb72ca23c2be2ed
100 Risk Score

Malware Insights

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

The OOXML document contains a VBA project with an AutoOpen macro, indicating it is designed to execute malicious code upon opening. The presence of a long encoded blob within the VBA project further suggests obfuscated malicious activity. The primary attack vector is likely a spearphishing attachment, leveraging the AutoOpen macro to initiate its execution chain.

Heuristics 4

  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
53d6395b1f1be265cfc3fb9edd3749a13c5033cb12b0537644814cc025ef4b79		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 265193 bytes
vbaProject_00.bin
e0ac783e76663479d7671583e730d9aa37318851da48b6b7c05b80846ab7da42		 vba-project OOXML VBA project: word/vbaProject.bin 1034752 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1885 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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