BazarLoader — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 5831fef60a2b92e0…

MALICIOUS

Office (OLE) / .DOC

124.0 KB Created: 2021-09-27 09:22:00 Authoring application: Microsoft Office Word
MD5: be766a673013664a6a0dbb9d7af3ba9c SHA-1: bb0b99e6c2270c4af83974573eb74840153943ee SHA-256: 5831fef60a2b92e01ef481ec7a6595477cd31f75f8334da5467d5665bc3d9d0b
182 Risk Score

Malware Insights

BazarLoader · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is a malicious Microsoft Word document containing VBA macros. The 'document_open' macro is designed to execute a payload. The script reconstructs a filename 'wordOfficeFive.h' and then executes it with the '.ta' extension, likely a second-stage payload. The ClamAV detection name 'Doc.Downloader.BazarBlue09211-9898945-0' strongly suggests the BazarLoader family.

Heuristics 6

  • ClamAV: Doc.Downloader.BazarBlue09211-9898945-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BazarBlue09211-9898945-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
32c59c4ddc44f16cd6ebd18b0249e8aafabfaee6cff310b78782a49d39c34d8e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1351 bytes

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