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

Static analysis result for SHA-256 21361d9f3c82dde4…

MALICIOUS

Office (OOXML) / .DOC

74.3 KB Created: 2021-01-22 09:33:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 2cc2cf2505610710707e60e5e7281b3f SHA-1: c62b2f6a54f4fdce54c06d4054949912a5803aba SHA-256: 21361d9f3c82dde476f755252b6e52981098c9db6be3da311e4464b2bf4ff891
220 Risk Score

Malware Insights

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

The file is an OOXML document containing a VBA macro, indicated by the 'OOXML_VBA' heuristic. The presence of an 'AutoOpen' macro and a 'Shell()' call within the VBA code strongly suggests that the document is designed to automatically execute malicious code upon opening. The ClamAV detection and 'Suspicious extracted artifact' heuristic further confirm its malicious nature, likely acting as a downloader for a second-stage payload. No specific family could be identified.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Downloader.8f0f0f0fe0f0f0f0-OOXML-9981534-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.8f0f0f0fe0f0f0f0-OOXML-9981534-0
  • 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.microsoft.com/office/drawing/2014/chartex
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2012/wordml
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • 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
c37fbf335f87987c006a890278eb81e84555256c133ee4d6636d3c056c4580de		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1453 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
d27520d15e7851c3294ec39283c65548949ca231360c5bb399daae87d44b9a2f		 vba-project OOXML VBA project: word/vbaProject.bin 18944 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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