SMB: Windows Execution (x86/fnstenv_mov) Shellcode (SMB-CTS1)
This signature detects shell code being sent as part of an exploit payload, specifically the Windows Execution shell, using the variable-length fnstenv/mov dword XOR encoder (x86/fnstenv_mov). This is a strong indication of malicious activity on your network.
Extended Description
Stack-based buffer overflow in the Plug and Play (PnP) service for Microsoft Windows 2000 and Windows XP Service Pack 1 allows remote attackers to execute arbitrary code via a crafted packet, and local users to gain privileges via a malicious application, as exploited by the Zotob (aka Mytob) worm.
Affected Products
Microsoft windows_xp
References
BugTraq: 14513
CVE: CVE-2005-1983
URL: http://www.metasploit.com/modules/encoder/x86/fnstenv_mov
Short Name
SMB:FTENV-SHELL
Severity
Critical
Recommended
False
Recommended Action
Drop
Category
SMB
Keywords
(SMB-CTS1) (x86/fnstenv_mov) CVE-2005-1983 Execution Shellcode Windows bid:14513
Release Date
04/19/2011
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3761
False Positive
Unknown
Vendors
Microsoft
CVSS Score
10.0