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

Static analysis result for SHA-256 c98661bcd5bd2e5d…

MALICIOUS

Office (OOXML) / .DOCX

195.8 KB Created: 2019-11-01 07:42:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: ec2e0cd0e224d5365551010140b9696e SHA-1: ce20b0898e43a4c6433e1430b1cb20afa0b57c3b SHA-256: c98661bcd5bd2e5df06d3432890e7a2e8d6a3edcb5f89f6aaa2e5c79d4619f3d
280 Risk Score

Malware Insights

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

The OOXML document contains a VBA macro, specifically a Document_Open macro, which utilizes the Shell() function. This indicates the macro is intended to execute external code. ClamAV signatures confirm this file is a downloader. The extracted artifact 'macros.bas' likely contains the malicious VBA code responsible for downloading and executing a secondary payload, although the specific download URL is not directly visible in the provided evidence.

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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