Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d78fc739b1a767eb…

MALICIOUS

Office (OOXML)

47.3 KB Created: 2021-07-01 10:25:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 4de489c0a6483c4c2a7225dc73827483 SHA-1: 04b955223f16ef142c7d1e9da1cd18ea435c7e9f SHA-256: d78fc739b1a767ebe9c98f9c0f388733c61d32b1d300b429cd3d54380a250fc6
322 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample contains VBA macros that execute upon opening, as indicated by the AutoOpen function. These macros use WScript.Shell to write a registry key and then proceed to download and execute a payload from a hardcoded URL. The ClamAV detection name 'Doc.Downloader.BazarBlue09212-9898946-0' suggests a downloader functionality, likely BazarLoader, which aligns with the observed behavior.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Doc.Downloader.BazarBlue09212-9898946-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BazarBlue09212-9898946-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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.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
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3b4cd13f900c1fcc72abe79e79928e24fa55154e34ebdda0444d9f31f26726fb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1463 bytes
vbaProject_00.bin
a5527d6d4897ac9b91fa2387f9015304e16c4b9f42813b46545dcdea3d93cc0e		 vba-project OOXML VBA project: word/vbaProject.bin 16896 bytes

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