VBSDownloader — Office (OLE) malware analysis

Static analysis result for SHA-256 a6e7cd9ccae24529…

MALICIOUS

Office (OLE)

58.5 KB Created: 2017-09-26 10:21:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: 310d690d477676e535d1ca5c28442f9b SHA-1: 5250c37f57ac493a1e6ab65fb8cab22c4013fb6f SHA-256: a6e7cd9ccae245296668825ad8af7638ef12dbef2a953f2f1ca8cc0878e968a5
90 Risk Score

Malware Insights

VBSDownloader · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical ClamAV heuristic 'Doc.Macro.VBSDownloader-6336817-0' strongly indicates this file is a VBSDownloader variant. The presence of a legacy WordBasic auto-exec macro (autoopen) further supports its malicious intent to execute a payload upon opening. The embedded URL was confirmed benign, but the primary threat comes from the macro's execution.

Heuristics 4

  • ClamAV: Doc.Macro.VBSDownloader-6336817-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.VBSDownloader-6336817-0
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 318 bytes
SHA-256: 96921b95dbeb1d83e603b82b6a4f5c05466e2de5bd59fb37fc1ac94c63313bbd
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Module1"

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