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Date discovered:19/06/2007
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:60.928 Bytes
MD5 checksum:61bd1eca45b4e44fdfc657bbf01bd387
VDF version: - Tuesday, June 19, 2007
IVDF version: - Tuesday, June 19, 2007

 General Method of propagation:
   • Local network

   •  Symantec: W32.Randex
   •  Mcafee: W32/Sdbot.worm
   •  Kaspersky: Backdoor.Win32.SdBot.bdw
   •  TrendMicro: Win32/Sdbot!8F5A

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Blocks access to security websites
   • Drops a malicious file
   • Lowers security settings
   • Records keystrokes
   • Registry modification
   • Steals information
   • Third party control

 Files It copies itself to the following location:
   • %SYSDIR%\csos.exe

– c:\sirh0t_changes_ur_hostfile.bat Further investigation pointed out that this file is malware, too. Detected as: BAT/Qhost.A

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
   • csos="csos.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • csos="csos.exe"

The following registry keys are added in order to load the service after reboot:

– [HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices]
   • csos="csos.exe"

It creates the following entry in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\
   • %WINDIR%\system32\csos.exe="%WINDIR%\system32\csos.exe:*:Enabled:@xpsp2res.dll,-22019"

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.

It drops copies of itself to the following network shares:
   • profiles$
   • IPC$
   • D$
   • print$
   • E$
   • Admin$
   • Admin$\system32
   • ipc$

It uses the following login information in order to gain access to the remote machine:

– A list of usernames and passwords:
   • zxcv; zxc; zulu; zombie; zmodem; zimmerman; zimmerma; ziggy; zeitgeis;
      zebra; zap; yxcv; youwontguessme; young; yosemite; yolanda;
      yellowstone; yellowst; yellow; yankee; yang; yaco; xyzzy; xyz;
      xxxxxxxxx; xxxxxxxx; xxxxxxx; xxxxxx; xxxxx; xxxx; xxx; xx; xray; xp;
      xmodem; xmen; xman; xfer; xena; wyoming; wwwadmin; www; wwii; WRITE;
      wormwood; worm; work; worf; wordperf; word; woodwind; wood; women;
      wombat; woman; wolverin; wolf; wizard; within; wiseass; wisconsin;
      wisconsi; wired; winxp; winston; winpass; winnt; wing; wine;
      windozexp; windozeME; windoze98; windoze95; windoze2k; windoze;
      windowz; WindowsXP; windowsME; windows98; windows95; windows2k;
      windows; windose; win98; win2k; win2000; win; wilma; willie;
      williamsburg; williams; william; will; wileecoyote; whore; wholesale;
      wholesal; whitney; whiting; white; whisky; whatnot; whatever; wh0re;
      wh0r3; western; west; werewolf; wendy; wendi; well; weenie; weed;
      wednesda; webpage; web; wave; water; watchwor; wasp; warren; warp;
      wargames; warfare; warez; ward; waco; w00t; vodka; visualba; visual;
      visitor; virus; virginia; virgin; village; videogam; video; victor;
      vicky; vertigo; veronica; venus; vasant; vampire; valerie; vagina;
      uwontguessme; uucp; utility; util; usmc; userpassword; username;
      usermane; user1; User; USER; user; usenet; ursula; urchin; uranus;
      upload; unlock; Unknown; unknown; unix; universi; universe; universa;
      uniform; unicorn; unhappy; undo; uncle; umesh; ugly; tuttle; turnip;
      turn; tuesday; tubas; tty; truth; true; tron; trombone; trojan;
      trivial; trisha; trek; tree; trapdoor; trap; transfer; trails; tracy;
      tracie; traci; toyota; toxic; tortoise; topography; topograp; tomato;
      tokenrin; token; toggle; toad; tits; tina; time; tiger; tiffany;
      thursday; thin; theresa; thailand; text; tetris; testing; testin;
      tester; test123; Test; test; TEST; tess; terminat; terminal; tera;
      tennis; temptation; temptati; temp123; temp; TEMP; telnet; telephone;
      telephon; teenage; teen; technical; tech; tears; teapot; team;
      teacher; taylor; tarragon; target; tara; tape; tango; tangerine;
      tangerin; tammy; tamie; tami; tamara; tall; talk; tabasco; SYSTEM;
      system; sysop; sysadmin; sys; symmetry; sybil; sybase; sword; switch;
      sweat; swearer; suzie; suzanne; susie; susanne; susan; surfing;
      surfer; supported; supporte; support; supervis; superuser; superuse;
      superstage; supersta; superson; superman; super; sunday; sun; summer;
      sue; sucks; suckmydi; suck; success; subway; subscrib; stuttgart;
      stuttgar; student1; student; strip; string; streetfi; stratford;
      stratfor; strangle; strange; stones; stoned; stoneage; steve; stereo;
      stephanie; stephani; steph; steel; steal; steak; starwars; startup;
      startrek; start; starship; star; Standard; staff; stacy; stacie;
      staci; stacey; sr71; squires; sqlpass; sqlagent; sql; spunk; springer;
      spring; spred; spit; spiderma; spider; spice; spencer; spell; spear;
      sparrows; spaceshi; spaceman; south; source; sossina; sonya; sonic;
      sonia; sondra; somebody; software; soft; sodomy; socrates; social;
      soap; snoopy; snatch; snake; snafu; snach; smut; smtp; smother;
      smooch; smiles; smile; smart; small; slut; slow; sliders; slick;
      slave; skull; site; single; singer; simulati; simpsons; simple; simon;
      simcity; silver; signature; signatur; sierra; siemens; sick; shuttle;
      short; shivers; shiva; shitpot; shit; shirley; shift; sherri; shell;
      sheldon; sheffield; sheffiel; sharon; sharks; shark; SHARE; sharc;
      shannon; sexy; sex; sesame; service; SERVER; serial; serenity; sentry;
      sentinel; sensor; sega; seed; security; secret; search; scriptkiddie;
      script; scout; scotty; scott; scorpion; scifi; schoolsucks; school;
      scheme; scamper; saxon; saturn; saturday; satanik; satanic; satan;
      sarah; sara; sandy; sandra; sample; samantha; sam; salt; sale; salami;
      sal; sage; safe; sa; ruth; rush; running; rules; rude; ruby; ruben;
      rubber; RPC; rough; Ross; roses; rosemary; rosebud; rose;
      RoscoPColtrane; RoscoP; Rosco; rooted; ROOT; root; ronald; ron;
      romulan; romeo; romano; rolex; rodent; rockyhor; rocky; rock;
      rochester; rocheste; rochelle; robyn; robotics; robot; robin; robert;
      roach; rje; risc; ripple; riot; ring; rightwin; right; riffraff; rick;
      rich; rhino; reveal; resistan; republic; report; rent; reno; renee;
      remote; release; regional; referenc; redhead; reddawn; record; rebel;
      rebecca; rebal; reaper; ream; really; reality; reagan; READ; razor;
      rascal; rape; random; raleigh; raindrop; rainbow; rain; raid; RAGE;
      rachmaninoff; rachmani; rachelle; rachel; rabbit; r00t; qwerty; qwert;
      qwer; qwe; quebec; qaz; pwd; pw123; pw; pussy; puppet; punk; punisher;
      puneet; pumpkin; puke; puck; public; pub; psychopa; psycho; protozoa;
      protect; prompt; program; profile; professor; professo; processo;
      proceed; privs; private; priv; printer; princeton; princeto; prince;
      presto; prelude; precious; praise; power; poster; post; porsche;
      porno; porn; pork; poor; poop; pondering; ponderin; polynomial;
      polynomi; polly; police; poetry; plymouth; pluto; plover; playboy;
      plane; pizza; piss; pinname; pink; pimp; pierre; pick; phuck; phreak;
      phrase; phrack; photon; phone; phoenix; philip; phil; peter; pete;
      pervert; persona; persimmon; persimmo; permit; perfect; percolate;
      percolat; pepsi; pepper; peoria; pentium; penthous; pentagra;
      pentagon; penname; penis; Penis; penguin; penelope; pencil; pecker;
      peanuts; pc; paula; patty; patriot; patrick; patricia; pat; paste;
      password123; password1; Password; PASSWORD; password; passwd;
      passphra; pass1234; pass123; pass; pascal; papers; paper; papa;
      pamela; pam; pakistan; paint; painless; pad; packer; packard; pacific;
      oxford; Owner; OWNER; owner; owned; own; owa; outside; output;
      outlook; outlaw; outdoors; osiris; oscar; orwell; orient; orca;
      orange; oracle; operator; opensesa; openlock; opening; omega; olivia;
      olivetti; oldage; okay; office; oemuser; oeminstall; OEM; oem; ocelot;
      oceanography; oceanogr; obscurit; nyquist; nuts; nutrition; nutritio;
      number; null; nukem; nuke; nude; nuclear; noxious; november; novel;
      nova; noth; notes; noreen; noob; none; nokia; node; nobody; noble;
      nnaacp; nita; nintendo; Nilez; nightmar; night; nicotine; nicole;
      nice; next; newyork; newton; newsgrou; news; newborn; new; network;
      netscape; netfuck; netdevil; netbios; net-devil; net; ness; neptune;
      nepenthe; neil; ND; navy; nasa; napoleon; nancy; name; nagel; mypc123;
      mypc; mypass123; mypass; mutant; muppets; msdos; MS; mpeg; MP; mozart;
      movies; movie; move; mouse; mountain; mosaic; mortgage; mortalco;
      mortal; morris; morley; more; moose; moor; moom; monica; monday;
      moguls; mogul; modem; mkii; mit; mission; misfit; minsky; minimum;
      mine; mike; midieval; microsof; micropro; microchi; micro; mickey;
      michelle; michele; michelan; michel; michael; mice; mgr; mets;
      metalica; metalhea; metal; merlin; mercury; menu; menace; memory;
      member; melrose; mellon; melissa; megan; megadeth; megabyte; meagan;
      maurice; Matthew; Matt; math; Mat; master; mass; mason; mary; marvin;
      marty; mars; marriage; marni; markus; mark; marines; marijuan;
      marietta; mariens; maria; marcy; marci; mara; manager; mana; malcom;
      malcolm; maint; main; mail; magnet; magic; maggot; macro; mack;
      macintosh; macintos; machine; M$; lynne; lynn; lust; luke; lude; lucy;
      lucus; luck; lover; lovebug; love; louis; loser; lorraine; lorin;
      lori; lore; loose; lolopc; lol; lois; logout; loginwor; loginpass;
      Login; login; logic; lockword; lockout; lock; LOCAL; load; liz; live;
      literatu; lisp; lisa; lips; lion; linux; link; linda; limited;
      limbaugh; lima; lightsab; light; life; licker; lick; library; liberal;
      lexluthe; lewis; letmein; leslie; lesbian; leroy; leland; legal;
      leftwing; left; leet; lee; lebesgue; leah; lazer; lazarus; lava;
      laura; laser; larry; larkin; lara; laptop; lana; lan; lamination;
      laminati; lambda; lakers; ladle; ladies; l33t; l337; kristy; kristine;
      kristin; kristie; kristi; kristen; krista; known; knightma; knight;
      knife; klingon; kitten; kissmyas; kiss; kirkland; kirk; king;
      kimberly; kim; kilo; killthem; killer; kill; kids; kiddie; keyword;
      keyin; keybord; key; kewl; kevin; kerry; kerrie; kerri; kernel;
      kermit; keri; kelly; katrina; katina; katie; kathy; kathrine;
      kathleen; kate; katana; karina; karie; karen; kaka; jupiter; june;
      juliet; julie; julia; juicy; juggle; judy; judith; joyce; joy;
      journal; joshua; joseph; johnny; johndoe; john; joe; jody; joanne;
      joan; jixian; jill; jewelry; jester; jessica; jerusale; jerry; jenny;
      jennifer; jenni; jen; jeff; jeanne; jean; jazz; java; jasmin; japan;
      janie; janice; janet; jane; jail; jackie; isis; irule; irishman;
      irene; Inviter; invent; intranet; internet; Internet; integer; inside;
      input; innocuous; innocuou; inna; ingrid; ingress; ingres; indians;
      indiana; indian; india; include; imperial; immortal; imbroglio;
      imbrogli; image; illumina; ihavenopass; icecream; ibm; ian; hypertxt;
      hyper; hydrogen; hutchins; hunter; hunt; http; hq; hotel; hotdog;
      host; horus; horse; horror; horrible; horny; hooters; hooker; honey;
      homework; homeuser; homer; homepage; home; hollywoo; holly; hole; ho;
      hits; hitler; highland; high; hidden; hibernia; hiawatha; hexadeci;
      hewlett; heroin; hero; herbert; herb; help; hello; hell; heinlein;
      heidi; hebrides; heaven; heather; heathen; heat; headoffice; headbang;
      head; haxing; hax0r; hax; hawaii; haven; hate; harvey; harold;
      harmony; harddriv; hardcore; hard; happening; happenin; handjob;
      handily; handel; hamster; hamlet; hallowee; hal; hair; hagar; hacker;
      hacked; hack; h4x1ng; h4x0ring; h4x0r1ng; guntis; gumption; guitar;
      Guest; GUEST; guest; guessme; guess; gucci; guardian; gryphon; group;
      green; great; grant; grand; grahm; graham; grades; govermen; gouge;
      gosling; gorges; gorgeous; good; golfer; golf; golden; gold;
      godblessyou; god; gobo; gnu; glen; glacier; girl; ginger; gina;
      gigabyte; gibson; ghost; gertrude; germ; george; gauss; gatt;
      gatherin; gateway; Gast; garfield; gardner; games; gabriel; fungible;
      function; fun; FULL; fudge; fuckyou; fuckme; fucking; fucker; fucked;
      fuck; fubar; fryguy; frog; frighten; friends; friend; friday; french;
      freedom; free; freddy; fred; freak; frank; france; foxtrot; fourier;
      forsythe; fornicat; format; form; forever; foresight; foresigh; ford;
      force; football; foolproof; foolproo; fool; food; foobar; flowers;
      flower; florida; float; flakes; fishers; fish; firewall; fire; finite;
      FILES; file; fight; field; fidelity; ferrari; fermat; fender; felicia;
      feds; fear; fast; fart; faraday; farad; family; false; falcon; faith;
      fairway; extension; extensio; explosiv; explorer; explore; explode;
      expert; exchnge; exchange; evelyn; euclid; eternity; estate;
      establish; establis; ersatz; erotic; erin; erika; erica; eric;
      erenity; enzyme; enterprise; enterpri; enter; english; england;
      engineer; engine; enemy; enable; emmanuel; emily; emerald; email;
      ellen; elizabeth; elizabet; elephant; electron; elanor; elaine;
      einstein; einsiein; eileen; eiderdown; eiderdow; egghead; edwina;
      edwin; education; educatio; edu; edition; edit; edinburgh; edinburg;
      edges; eddie; echo; eatme; easy; easier; earth; eagle; eager; dyke;
      dungeon; duncan; dulce; duke; duelist; dudette; dude; dud3; duck;
      drought; drive; drdoom; dragon; dos; dope; doors; door; doonesbu;
      doomsday; doomii; doom2; doom; dong; donaldduck; domainpassword;
      domainpass; domain; dollar; dog; doctor; display; disney; diskette;
      disk; discovery; discover; disclose; discipli; disc; dirty; director;
      direct; dipshit; dinosaur; digital; dieter; diet; diehard; dick; dice;
      diane; diana; diamond; dial; devil; device; develop; desperate;
      desperat; desktop; desk; desiree; dennis; denise; democrat; demo;
      DEMO; deluge; delta; Dell; dell; defoe; Default; DEFAULT; default;
      deck; december; debug; deborah; debbie; deb; deathsta; death; dead;
      dbpassword; dbpass; db1234; db1; dawn; dave; databasepassword;
      databasepass; database; data; darkaven; dark; dapper; danny; danielle;
      daniel; dancer; dana; daisy; daemon; d00d; cynthia; cyberspa;
      cyberpun; cyber; customer; cunt; ctx; cshrc; crystal; cristina;
      criminal; crime; cretin; creosote; credit; creature; creation; create;
      cream; crash; crackpot; crack; cowboy; couscous; country; counters;
      correct; cornelius; corneliu; copy; cops; copper; cooper; cool;
      cookie; cookbook; cook; control; continue; console; conserva; connie;
      connect; condom; condo; comrades; comrade; computin; computer; compaq;
      company; commrades; commrade; commit; comics; combat; color; collins;
      cold; cola; coke; coin; coffee; codeword; codename; code; cock;
      cocainco; cocacola; coast; clusters; cluster; clinton; cleavage;
      claymore; claudia; classic; classes; class; cisco; cindy; cigarett;
      cigar; CHT; christy; christine; christina; christin; chris; chip;
      chester; chess; chemistry; chemistr; chem; CHECK; chat; charon;
      charming; charlie; charles; charity; Changeme; changeme; change;
      cerulean; celtics; celtic; celt; cecily; cayuga; cave; cathy;
      catholic; catherine; catherin; cat; castle; cash; cascades; carson;
      carrie; caroline; carolina; carole; carol; carmen; carla; caren;
      cardinal; card; capture; captain; capitol; cantor; candy; candi;
      camping; campanile; campanil; camille; californ; cad; butthead; butt;
      butch; burn; burgess; bung; bumbling; bullshit; bulls; bsd; brutefor;
      brute; brunette; bruce; brothel; broadway; bridget; brian; brenda;
      breast; break; bravo; brandy; brandi; bradley; boyscout; BOTH; born;
      book; boobs; boob; boner; bomb; bob; board; blues; blue; blowjob;
      blow; bloodaxe; blood; blondie; blonde; blank; black; bla; bitnet;
      bitmap; bitch; bishop; bird; bios; binary; billy; bill; bigfoot;
      bicameral; bicamera; bible; beverly; betty; betsie; beth; beta; beryl;
      berliner; berlin; berkeley; beowulf; benz; beloved; bell; behead;
      begin; beethoven; beethove; becky; beaver; beauty; beater; beast;
      bear; beammeup; beach; batman; batch; bassoon; bass; basic; baseball;
      bartman; bart; baritone; barf; bare; barber; barbara; banks; bank;
      bandit; bananas; banana; ball; bailey; badass; backup; BACKUP;
      backdoor; bacchus; baby; babe; azure; aztecs; authoriz; attack; atom;
      atmosphere; atmosphe; athena; asshole; asm; asian; asdfgh; asdf; asd;
      artist; arthur; arrow; army; arlene; ariadne; aria; april; apollo13;
      anything; anvils; anthropogenic; anthropo; anthrax; answer; anonymou;
      anon; annette; anne; anna; ann; anita; animals; animal; angie;
      angerine; angela; anfo; andy; andromache; andromac; android; andrea;
      anchor; anarchy; anarchis; analog; anal; amy; amorphous; amorphou;
      america; amber; amanda; amadeus; ama; alphabet; alpha; allow; allison;
      alison; alisa; alicia; alice; aliases; algebra; alf; Alexander;
      alexande; Alex; alex; alert; albert; albatross; albatros; albany;
      alaska; Al3x; airplane; aids; afro; aerobics; adult; adrianna; adrian;
      Administrator; ADMINISTRATOR; administrator; Administrateur;
      Administrador; EdmInistreiter; L'amministratore; oikeusministeri;
      forsterkning; administrada; administrat; admin123; Admin; ADMIN;
      admin; adm; adam; ada; accounts; accounting; account; access; ACCESS;
      accept; academic; academia; abcd; abc123; abc; aaa; 88888888; 654321;
      54321; 2600; 2003; 2002; 123qwe; 123asd; 123abc; 1234qwer; 123467890;
      12346789; 1234678; 123467; 12346; 123456789; 12345678; 1234567;
      123456; 12345; 1234; 123123; 123; 121212; 121; 12; 11111111; 111111;
      111; 110; 0wned; 0wn3d; 007; 00000000; 000000; 00000; 0000; 000; 00;
      !@; $%^&*; !@; $%^&; !@; $%^; !@; $%; !@; $

IP address generation:
It creates random IP addresses while it keeps the first octet from its own address. Afterwards it tries to establish a connection with the created addresses.

Remote execution:
–It attempts to schedule a remote execution of the malware, on the newly infected machine. Therefore it uses the NetScheduleJobAdd function.

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: csos.**********
Port: 4961
Server password: 146751dhzx
Channel: #100+
Nickname: %random character string%
Password: hzx

– This malware has the ability to collect and send information such as:
    • CPU speed
    • Current user
    • Free disk space
    • Free memory
    • Malware uptime
    • Information about the network
    • Information about running processes
    • Size of memory
    • Username
    • Information about the Windows operating system

– Furthermore it has the ability to perform actions such as:
    • Launch DDoS SYN flood
    • Download file
    • Edit registry
    • Kill process
    • Start keylog
    • Updates itself

 Hosts The host file is modified as explained:

– Access to the following domains is effectively blocked:

 Backdoor The following port is opened:

%SYSDIR%\csos.exe on TCP port 113 As a result remote control capability is provided.

 Miscellaneous Mutex:
It creates the following Mutexes:
   • MUTEX_ID_01000001
   • csos

 File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Alexandru Dinu on Wednesday, October 3, 2007
Description updated by Andrei Gherman on Thursday, October 4, 2007

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