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Unfortunately, defeating spyware is harder than evading conventional viruses.
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GPCoder.h Trojan Win32 ransomware trojan

Wednesday, January 9, 2008

This is a detection for a ransomware trojan. It encrypts files on the harddrive, creates a text-file indicating what has happened, and gives email addresses to send the ransom money to.
Aliases

* Backdoor:Win32/Kollah.D (Microsoft)

* TSPY_KOLLAH.F (TrendMicro)

* Virus.Win32.Gpcode.ai (Kaspersky)

Characteristics

-- Update July 17, 2007 --
The risk assessment of this threat has been updated to Low-Profiled due to media attention at:

This trojan encrypts documents, depending on the file extension, and then attempts to extort money from the victim in order for them to obtain a decryptor tool to recover the documents.

When run this trojan searches for files using the following extensions:

* .12m
* .3ds
* .3dx
* .4ge
* .4gl
* .7z
* .a
* .a86
* .abc
* .acd
* .ace
* .act
* .ada
* .adi
* .aex
* .af3
* .afd
* .ag4
* .ai
* .aif
* .aifc
* .aiff
* .ain
* .aio
* .ais
* .akf
* .alv
* .amp
* .ans
* .ap
* .apa
* .apo
* .app
* .arc
* .arh
* .arj
* .arx
* .asc
* .asm
* .ask
* .au
* .bak
* .bas
* .bb
* .bcb
* .bcp
* .bdb
* .bh
* .bib
* .bpr
* .bsa
* .btr
* .bup
* .bwb
* .bz
* .bz2
* .c
* .c86
* .cac
* .cbl
* .cc
* .cdb
* .cdr
* .cgi
* .cmd
* .cnt
* .cob
* .col
* .cpp
* .cpt
* .crp
* .cru
* .csc
* .css
* .csv
* .ctx
* .cvs
* .cwb
* .cwk
* .cxe
* .cxx
* .cyp
* .d
* .db
* .db0
* .db1
* .db2
* .db3
* .db4
* .dba
* .dbb
* .dbc
* .dbd
* .dbe
* .dbf
* .dbk
* .dbm
* .dbo
* .dbq
* .dbt
* .dbx
* .dfm
* .djvu
* .dic
* .dif
* .dm
* .dmd
* .doc
* .dok
* .dot
* .dox
* .dsc
* .dwg
* .dxf
* .dxr
* .eps
* .exp
* .f
* .fas
* .fax
* .fdb
* .fla
* .flb
* .frm
* .fm
* .fox
* .frm
* .frt
* .frx
* .fsl
* .gtd
* .gif
* .gz
* .gzip
* .h
* .ha
* .hh
* .hjt
* .hog
* .hpp
* .htm
* .html
* .htx
* .ice
* .icf
* .inc
* .ish
* .iso
* .jar
* .jad
* .java
* .jpg
* .jpeg
* .js
* .jsp
* .key
* .kwm
* .lst
* .lwp
* .lzh
* .lzs
* .lzw
* .ma
* .mak
* .man
* .maq
* .mar
* .mbx
* .mdb
* .mdf
* .mid
* .mo
* .myd
* .obj
* .old
* .p12
* .pak
* .pas
* .pdf
* .pem
* .pfx
* .php
* .php3
* .php4
* .pgp
* .pkr
* .pl
* .pm3
* .pm4
* .pm5
* .pm6
* .png
* .ppt
* .pps
* .prf
* .prx
* .ps
* .psd
* .pst
* .pw
* .pwa
* .pwl
* .pwm
* .pwp
* .pxl
* .py
* .rar
* .res
* .rle
* .rmr
* .rnd
* .rtf
* .safe
* .sar
* .skr
* .sln
* .swf
* .sql
* .tar
* .tbb
* .tex
* .tga
* .tgz
* .tif
* .tiff
* .txt
* .vb
* .vp
* .wps
* .xcr
* .xls
* .xml
* .zip

Found documents are encoded and a text file named read_me.txt is placed in the directory containing the following text:

Hello, your files are encrypted with RSA-4096 algorithm
(http://en.wikipedia.org/wiki/RSA).
You will need at least few years to decrypt these files without our
software. All your private information for last 3 months were
collected and sent to us.
To decrypt your files you need to buy our software. The price is $300.
To buy our software please contact us at: %s and provide us
your personal code %d. After successful purchase we will send
your decrypting tool, and your private information will be deleted
from our system.
If you will not contact us until 07/15/2007 your private information
will be shared and you will lost all your data.
Glamorous team

The following registry key is created to run itself at Windows login:
# HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion
\winlogon\userinit = "%SysDir%\userinit.exe, %SysDir%\ntos.exe,"

(Where SysDir is the Windows System directory, e.g. C:\Windows\System32)



Symptoms

* File types mentioned previously, overwritten with "garbage" (encrypted data).
* Presence of aforementioned read_me.txt files.

Method of Infection


This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.
posted by Mandy, 3:06 AM

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