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

Static analysis result for SHA-256 7fc26c2376ee0d31…

MALICIOUS

Office (OOXML) / .DOCX

195.0 KB Created: 2019-11-01 07:42:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: 334b944e6fa7035ebd8ae2caec52e5e0 SHA-1: b003182f6a34080a4e1503b79de8b604b2726dcf SHA-256: 7fc26c2376ee0d315bb25dd72cabe42191aba0a9fc4fc1c0ffc8566d25c9636b
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

This OOXML document contains VBA macros, specifically a Document_Open macro that utilizes the Shell() function. This indicates the document is designed to download and execute a secondary payload. ClamAV signatures confirm its malicious nature as a downloader. No specific family could be identified, but the presence of VBA macros and the use of Shell() are key indicators.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Downloader.Generic-8011192-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-8011192-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3521d975dff3b15ecfe1285032766324969213288a8ed74247142757041ad881		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 51938 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
240a6379cbd159ad0b2d876070d3e3610a823be1c546216ac532b700ce763807		 vba-project OOXML VBA project: word/vbaProject.bin 164352 bytes
Detection
ClamAV: Doc.Downloader.Generic-8011192-0
Obfuscation or payload: unlikely

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