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

Static analysis result for SHA-256 5aed9aaa3ebdd606…

MALICIOUS

Office (OOXML) / .DOC

1.27 MB Created: 2022-11-01 14:58:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2022-11-11
MD5: 507a0f9cc9f2aac8ed784030154933d4 SHA-1: 104f8c54a04c22da829c3841b5c069b202d8dc98 SHA-256: 5aed9aaa3ebdd606c5cb7cc441c65f8afbba4d96c96b126ee5a3f0b226831772
230 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample contains a VBA macro that executes a Shell() command, indicating it is designed to download and execute a second-stage payload. The macro uses obfuscated string concatenation to construct a URL, which is then used to fetch and run additional content. This behavior is consistent with a downloader malware.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Downloader.afc5c039d11fd238-9978787-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.afc5c039d11fd238-9978787-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.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/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
77474de55496faf19c45a0515e18a43b3a4bba9ff26c252be12e652152d35694		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 17889 bytes
vbaProject_00.bin
e67e39a23d28a5f8bbf92495e4b91a3afd044582bfb769ab2b8d8e83f5fe7692		 vba-project OOXML VBA project: word/vbaProject.bin 36864 bytes

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