| Alias: | |
| Strain: | - |
| detected when: | |
| where: | |
| Classification: | COM and EXE infector, resident |
| Length: | 81 paragraph(s) |
Preconditions | |
| Operating System(s): | MS-DOS |
| Version/Release: | DOS >= 3.10 |
| Computer model(s): | PC's |
| Caroname: | Gotcha |
Attributes | |
| Easy identification: | |
Type of Infection: | The virus appends itself to the files Selfrec in memory: INT_21;AX=DADA -> AH=A5 (AL=15 in this version) Selfrec on disk: File[12h] == 4021h |
| Infection Technique: | |
| Infection Trigger: | (Loadexec || Close) && (Ext in {"EXE","COM"}) &&(300h < COM_size%64k < 0F000h) |
| Storage Media affected: | |
| Interrupts hooked: | 21/4B00, 21/3E, 21/DADA, 24 |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | - |
| Encoding Method: | |
| Damage: | Transient: replaces the current program with another program which iscontained within the virus. The new program self-unpacks, displaysa "LEGALIZE CAnnAbIS" poster if the video mode is suitable (modes2, 3 or 7, otherwise just writes the text "Legalize Cannabis"), andasks for a keypress before continuing. Then the user is presented witha simple quiz about whether Cannabis should be legalised. It acceptsy/n/Y/N answers and responds according to the answers given.(question 1)Do you think Cannabis should be legalized? (Y/N)(answer yes)I'm glad you agree with me!(answer no, so ask question 2)And what about Alcohol, should that be illegal too? (Y/N)(answer yes)Hmm, I don't agree with you but I respect your opinion.(answer no)You are a HYPOCRITE!!! Permanent: - |
| Damage Trigger: | Transient: Install_Succeeded && Day_of_Week == Friday Permanent: - |
| Particularities: | The virus resides above the last MCB The virus disables the keyboard. Displayed text: (see TRANSIENT_DAMAGE: above); Encrypted Not displayed text: " LEGALIZE " The payload program is 1138 bytes and uncompresses itself to 4186bytes when run. It is a later version of the payload carried by theGIRAFE virus, but the compression method seems to be less effective.The actual virus code is on the whole pretty well-written. |
| Similarities: | GIRAFE |
Agents | |
| Countermeasures: | |
| Standard means: | |
Acknowledgements | |
| Location: | Virus Test Center, University Hamburg, FRG |
| Classification by: | Adam David, Frisk Software International |
| Documentation by: | Adam David, Frisk Software International |
| Date: | 20.6.93 |
| Information Source: | Caroentry (autom.converter by S.Freitag) |
(c) 1996 Virus-Test-Center, University of Hamburg