FYI. Thanks. ... Kev Kevin P. Knox, SSgt, USAF Systems Administrator, IP Network Manager Novell Certified NetWare Engineer Royal Air Force Croughton, United Kingdom Near Brackley, Northamptonshire My PGP public key can be obtained via anonymous FTP from nsc.croughton.af.mil (131.56.128.5) From: pch@assist.mil Subject: ASSIST 95-46, AOLGOLD Trojan Program. To: assist-bulletin@assist.mil Date sent: Mon, 4 Dec 1995 16:06:54 -0500 (EST) Copies to: assist@assist.mil -----BEGIN PGP SIGNED MESSAGE----- <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Automated Systems Security Incident Support Team _____ ___ ___ _____ ___ _____ | / /\ / \ / \ | / \ | | / Integritas / \ \___ \___ | \___ | | < et /____\ \ \ | \ | | \ Celeritas / \ \___/ \___/ __|__ \___/ | |_____\ <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Bulletin 95-46 Release date: 4 December, 1995, 4:00 PM EST (GMT -5) SUBJECT: AOLGOLD Trojan Program. SUMMARY: A trojan program called AOLGOLD.ZIP that deletes c: drive files when executed is being distributed around America Online and other networks. BACKGROUND: The AOLGOLD Trojan program was recently discovered on America Online (AOL). Notice about the Trojan has been circulated to all America Online subscribers. An e-mail message that contained an attached archive file named AOLGOLD.ZIP was circulated on AOL. A README file that is in the archive describes the fictitious AOLGOLD as a new and improved interface for the AOL online service. Reading or downloading the included file will not damage your system, the trojaned program must be executed for damage to occur. If you unzip the archive, you get two files: INSTALL.EXE and README.TXT. The README.TXT file again describes AOLGOLD as a new and improved interface to the AOL online service. The INSTALL.EXE program is a self-extracting ZIP archive. When you run the install program, it extracts 18 files onto your hard drive: MACROS.DRV VIDEO.DRV INSTALL.BAT ADRIVE.RPT SUSPEND.DRV ANNOY.COM MACRO.COM SP-NET.COM SP-WIN.COM MEMBRINF.COM DEVICE.COM TEXTMAP.COM HOST.COM REP.COM EMS2EXT.SYS EMS.COM EMS.SYS README.TXT The file list includes another README.TXT file. If you examine the new README.TXT file, it starts out with "Ever wanted the Powers of a Guide" and continues with some crude language. The README.TXT file indicates that the included program is a guide program that can be used to kick other people off of AOL. If you stop at this point and do nothing but examine the unzipped files with the TYPE command, your machine will not be damaged. The following three files contain the Trojan program: MACROS.DRV VIDEO.DRV INSTALL.BAT The rest of the files included in the archive appear to have been chosen at random and included to simply fill up the archive and make it look official. The Trojan program is started by running the INSTALL.BAT file. The INSTALL.BAT file is a simple batch file that renames the VIDEO.DRV file to VIRUS.BAT and then runs it. VIDEO.DRV is an amateurish DOS batch file that starts deleting the contents of several critical directories on your C: drive, including: c:\ c:\dos c:\windows c:\windows\system c:\qemm c:\stacker c:\norton It also deletes the contents of several other directories, including those for several online services and games, such as: c:\aol20 c:\prodigy c:\aol25 c:\mmp169 c:\cserve c:\doom c:\wolf3d When the batch file completes, it prints a crude message on the screen and attempts to run a program named DoomDay.EXE. Bugs in the batch file prevent the DOOMDAY.EXE program from running. Other bugs in the file cause it to delete itself if it is run from any drive but the C: drive. IMPACT: When the INSTALL.EXE program is executed, files on the users c: drive are deleted. RECOMMENDED SOLUTIONS: NOTE: Do not copy any files onto your hard disk before trying to recover your hard drive. The files are deleted with the DOS del command, and can be recovered with the DOS undelete command. The files are still on your disk, only the directory entries have been removed. If you copy any new files onto your hard disk, they will likely be written over the deleted files, making it impossible to recover the deleted files. If you have delete protection installed on your system, recovery will be relatively easy. If not, the DOS undelete command can be used, but you will have to supply the first letter of each file name as it is recovered. In many cases, you will probably want to restore the directories by reinstalling them from the original installation disks, but do that last. You must recover any unreplaceable files first using undelete and then replace any others by copying or reinstalling them from the distribution disks. To recover the system: (1) Boot the system with a clean, locked floppy containing the recovery program for the recovery files you have installed, or the DOS UNDELETE.EXE program if you do not have recovery files installed. (2) Type the VIRUS.BAT file to get a list of the directories the Trojan tried to delete. Ignore any directories that don't exist on your machine. (3) Run the recovery program and recover your files. You may have to help it find the recovery files, such as MIRROR, which will be in the root directory. You may have to recover the MIRROR file first and then use it to recover the other files. If you are using only the DOS undelete command, type: undelete directory where directory is the name of the directory to examine. To undelete the files in the dos directory, use: undelete c:\dos The undelete program will present you with a list of deleted files with the first letter replaced with a question mark. Without delete protection, you will have to supply this letter in order to undelete the file. (4) After you have restored as many files as you want or can using the UNDELETE command, replace any others by reinstalling them using the original installation disks. <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ASSIST would like to thank the Department of Energy CIAC for information contained in this bulletin. <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ASSIST is an element of the Defense Information Systems Agency (DISA), and provides service to the entire DoD community. Constituents of the DoD with questions about ASSIST or computer security issues, can contact ASSIST using one of the methods listed below. Non-DoD organizations/institutions, contact the Forum of Incident Response and Security Teams (FIRST) representative. To obtain a list of FIRST member organizations and their constituencies send an email to docserver@first.org with an empty "subject" line and a message body containing the line "send first-contacts". ASSIST Information Resources: To be included in the distribution list for the ASSIST bulletins, send your Milnet (Internet) e-mail address to assist-request@assist.mil. Back issues of ASSIST bulletins, and other security related information, are available from the ASSIST BBS at 703-607-4710, 327-4710, and through anonymous FTP from assist.mil (IP address 199.211.123.11). Note: assist.mil will only accept anonymous FTP connections from Milnet addresses that are registered with the NIC or DNS. If your system is not registered, you must provide your MILNET IP address to ASSIST before access can be provided. ASSIST Contact Information: PHONE: 800-357-4231, COMM 703-607-4700, DSN 327-4700. ELECTRONIC MAIL: assist@assist.mil. ASSIST BBS: COMM 703-607-4710, DSN 327-4710, leave a message for the "sysop". FAX: COMM 703-607-4735, DSN 607-4735 ASSIST uses Pretty Good Privacy (PGP) 2.6.2 as the digital signature mechanism for bulletins. PGP 2.6.2 incorporates the RSAREF(tm) Cryptographic Toolkit under license from RSA Data Security, Inc. A copy of that license is available via anonymous FTP from net-dist.mit.edu (IP 18.72.0.3) in the file /pub/PGP/rsalicen.txt, and through the world wide web from http://net-dist.mit.edu/pgp.html. In accordance with the terms of that license, PGP 2.6.2 may be used for non-commercial purposes only. Instructions for downloading the PGP 2.6.2 software can also be obtained from net-dist.mit.edu in the pub/PGP/README file. PGP 2.6.2 and RSAREF may be subject to the export control laws of the United States of America as implemented by the United States Department of State Office of Defense Trade Controls. The PGP signature information will be attached to the end of ASSIST bulletins. Reference herein to any specific commercial product, process, or service by trade name, trademark manufacturer, or otherwise, does not constitute or imply its endorsement, recommendation, or favoring by ASSIST. 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