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

Static analysis result for SHA-256 df1ca379e11574d3…

MALICIOUS

Office (OOXML) / .DOC

74.7 KB Created: 2021-01-26 11:14:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 9ed39064afa79e958abfef6dea3745a4 SHA-1: b65942e7631578afdb6beaf4228a0c3023be42be SHA-256: df1ca379e11574d384767405e2193d044454130f0fc16a9745941c5b41700b7f
220 Risk Score

Malware Insights

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

The file is a malicious OOXML document containing VBA macros. The presence of an AutoOpen macro and a critical `Shell()` call indicates that the document is designed to execute arbitrary commands upon opening. The ClamAV detection and heuristic firings confirm its downloader nature, likely executing a second-stage payload. No specific family could be identified, but the execution method is clear.

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
b463cc741fc6c59622f5724fb8de32a11c2af5e493fbdcd6c2b2f75be9ebde05		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1621 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
ef626fbf0fe257fc0852aff4fc51935f13fb6056ec6da3bdd39ec5401669e3a6		 vba-project OOXML VBA project: word/vbaProject.bin 19456 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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