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

Static analysis result for SHA-256 335a449fcacab5ef…

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: f1cdcb9d58995e2925d2d9673f37401f SHA-1: 5980eda8d8e9c8fc14738d150b21941fb5f02d09 SHA-256: 335a449fcacab5ef6951073d95f914e374d729c1dd6a6f71f96316714a73596a
230 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains a VBA macro with a Document_Open event that utilizes Shell() and CreateObject() calls. The macro attempts to reconstruct a registry path for persistence: HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy. The script's obfuscation and truncated nature prevent a full analysis of the downloaded payload, but the overall intent is clearly to download and execute additional malicious content.

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
5a376f0e4a9e7ea280f1af16651ed9c767983928ab6d905e6767cd9b391f59f4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 17753 bytes
vbaProject_00.bin
16e667d7d2f5c5bcf691d32a6e8b5c7142e54ba66bb2512e65cbe6a1b33f4c78		 vba-project OOXML VBA project: word/vbaProject.bin 36864 bytes

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