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Sober.H


Aliases:


Sober.H
I-Worm.Sober.h

Malware

W32

Summary

Sober.H appeared on June 11th, 2004. This Sober variant doesn't spread itself in e-mails. Instead, it mass-mails political statements. It might have been downloaded to computers already infected by earlier Sober variant, Sober.G for example.



Disinfection & Removal

Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details

Sober.H is written in Visual Basic. Its file is a PE executable 59747 bytes long, packed with UPX file compressor. Sober.H has its own SMTP engine.


Installation to system

Sober.H's file is started installs itself to system. It copies itself to Windows System folder with a semi-randomly generated name and EXE extension. The following text strings are used to generate the file name of the Sober's executable:

sys
 host
 dir
 expolrer
 win
 run
 log
 32
 disc
 crypt
 data
 diag
 spool
 service
 smss32


After that Sober.H creates startup keys for its file in Windows Registry. The key names are also semi-randomly generated from the above given list. The following keys are created:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
 "<random>" = "%WinSysDir%\<random>.exe"
 [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
 "<random>" = "%WinSysDir%\<random>.exe"


During its installation cycle Sober.H creates the following files in Windows System folder:

bcegfds.lll
 zhcarxxi.vvx
 cvqaikxt.apk
 Odin-Anon.Ger


These files have zero length and they are used to disable previous variants of Sober if they are installed on an infected computer.


Sending e-mails

Sober.H sends different e-mail messages with political statements. It doesn't attach itself to these messages.

Before spamming Sober.H scans files with certain extensions on all hard disks to harvest e-mail addresses. Files with the following extensions are scanned:

pmr
 stm
 slk
 inbox
 imb
 csv
 bak
 imh
 xhtml
 imm
 imh
 cms
 nws
 vcf
 ctl
 dhtm
 cgi
 pp
 ppt
 msg
 jsp
 oft
 vbs
 uin
 ldb
 abc
 pst
 cfg
 mdw
 mbx
 mdx
 mda
 adp
 nab
 fdb
 vap
 dsp
 ade
 sln
 dsw
 mde
 frm
 bas
 adr
 cls
 ini
 ldif
 log
 mdb
 xml
 wsh
 tbb
 abx
 abd
 adb
 pl
 rtf
 mmf
 doc
 ods
 nch
 xls
 nsf
 txt
 wab
 eml
 hlp
 mht
 nfo
 php
 asp
 shtml
 dbx


The found e-mail addresses and user names are saved in these 2 files that Sober.H creates in Windows System folder:

llsapwin32.dats
 mswn32sock.dats


When Sober.H is active in memory it blocks access to these files as well as to its executable file.

Sober.H ignores e-mail addresses that contain any of the following substrings:

@www
 @from.
 smtp-
 @smtp.
 gold-certs
 ftp.
 .dial.
 .ppp.
 anyone
 subscribe
 mantec
 announce
 @gmetref
 sql.
 someone
 nothing
 you@
 user@
 reciver@
 somebody
 secure
 msdn.
 me@
 whatever@
 whoever@
 anywhere
 yourname
 mustermann@
 .kundenserver.
 mailer-daemon
 variabel
 -dav
 law2
 .sul.t-
 .qmail@
 t-ipconnect
 t-dialin
 ipt.aol
 time
 freeav
 @ca.
 abuse
 winrar
 domain.
 host.
 viren
 bitdefender
 spybot
 detection
 icrosoft
 ewido.
 emsisoft
 @foo.
 winzip
 @example.
 bellcore.
 @arin
 mozilla
 @iana
 @avp
 @msn
 @sophos
 @panda
 @kaspers
 free-av
 antivir
 virus
 verizon.
 @ikarus.
 @nai.
 @messagelab
 nlpmail01.
 clock



Payload

Sober.H can download and activate an executable file from the following website:

people.freenet.de


The name of the downloaded executable file is 'winhlpx32ll.exe'.


Deactivation of Sober.H

Sober.H periodically looks for a file named 'sysmms32.lla' and it this file is found, it uninstalls itself from memory. Moreover, if this file is present in Windows System folder, Sober.H does not install itself to a system.



Detection

Detection of Sober.H is available in the following FSAV updates:

Detection Type: PC
Database: 2004-06-11_03



Description Created: Alexey Podrezov; June 11th, 2004



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