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

Static analysis result for SHA-256 a7efe445ee03a314…

MALICIOUS

Office (OOXML) / .DOC

193.7 KB Created: 2019-11-01 07:42:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: 6a805d9a6d6eae5c3dc74f357f8f1a40 SHA-1: 1d923e038ca9dafd2e19da7545e83d2fcfd4a3c4 SHA-256: a7efe445ee03a314baa6cb002b91a073b87b82ba30101dffe08c7bb28abc33b0
280 Risk Score

Malware Insights

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

The OOXML document contains VBA macros, specifically a Document_Open macro, which is designed to execute a shell command. This command likely downloads and executes a secondary payload, as indicated by the ClamAV detection of 'Doc.Downloader.Generic-8011192-0' on both the primary file and an extracted artifact named 'macros.bas'. The presence of the Shell() call in VBA is a critical indicator of malicious downloader behavior.

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
65cbcee5105159ec71f4f629ca425321d2879b16e4bbb18bbddcc2d926491765		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 50688 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
63a70e3c12bb0d91fc67ed46ce12027f95b26bd5194261e4692c18983bc3b343		 vba-project OOXML VBA project: word/vbaProject.bin 162816 bytes
Detection
ClamAV: Doc.Downloader.Generic-8011192-0
Obfuscation or payload: unlikely

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