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

Static analysis result for SHA-256 585996b9f6150984…

MALICIOUS

Office (OOXML) / .DOC

247.6 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 4e6abf9b216fbada665d3b44e5945411 SHA-1: f8bd7742a17767c0a01e3a5589e25e8d0d559646 SHA-256: 585996b9f6150984636569b8d0758fd1abb499f6a12df660b8fdbaeedbd62e6a
200 Risk Score

Malware Insights

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

The file contains VBA macros, including an AutoOpen macro, which is a strong indicator of malicious intent. The presence of CreateObject calls suggests the macro attempts to execute code. ClamAV identified this as a downloader, and the heuristics confirm the presence of VBA macros designed for execution. The embedded URLs, while mostly benign schema references, are part of the document's structure that facilitates the macro execution. The primary function appears to be downloading and executing a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Downloader.BlueWord12213-9918951-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord12213-9918951-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.openxmlformats.org/markup-compatibility/2006
    • 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/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
b1cec46e9a52c765ba03e2f8e4750462871c4dc690e02d00b4051e6043063923		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2359 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
ec1f29b9d5e80c279d85c41cbdebeebff26d965f23ab5a651d1fde1ac123bd57		 vba-project OOXML VBA project: word/vbaProject.bin 97280 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.

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