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

Static analysis result for SHA-256 9467856fd73263e8…

MALICIOUS

Office (OOXML) / .DOCX

195.8 KB Created: 2019-11-01 07:42:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: f01b6cc0139f414137a5f59961231603 SHA-1: 87655144e2549338e89fc64fb65c537c07225fb5 SHA-256: 9467856fd73263e8a7267fe22f7f84241e972fef47c595467d48b7e6b1c9fa86
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The OOXML document contains a VBA project with a Document_Open macro, which is a common technique for executing malicious code upon opening. The critical heuristic firing for Shell() call in VBA indicates that the macro attempts to execute an external command. ClamAV detections further confirm the malicious nature, identifying it as a downloader. The primary intent appears to be downloading and executing a second-stage payload.

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
11aaf8c71e7d5994c21a21bc4918c5b989c9d401655308b9eeac7d5540f8346f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 50994 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
e2bcffdf383a81e978f6e0d5f8ac8a8b3e70ed0ed7acbd3eac1b1e4fff2b7da2		 vba-project OOXML VBA project: word/vbaProject.bin 168448 bytes
Detection
ClamAV: Doc.Downloader.Generic-8011192-0
Obfuscation or payload: unlikely

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