Blazebot_3dd4700eae

by malwarelabrobot on January 24th, 2014 in Malware Descriptions.

Worm:Win32/Neeris (Microsoft), Trojan.Win32.Blazebot.sd (Kaspersky), Trojan.Win32.Generic!BT (VIPRE), BackDoor.IRC.Sdbot.16716 (DrWeb), Artemis!3DD4700EAEEC (McAfee), WS.Reputation.1 (Symantec), Trojan.Win32.Blazebot (Ikarus), Autoit_c.ZXM (AVG), AutoIt:Injector-GA [Trj] (Avast), TROJ_GEN.R0CBC0DAN14 (TrendMicro), GenericMSNWorm.YR, GenericAutorunWorm.YR, GenericIRCBot.YR, GenericProxy.YR, Blazebot.YR (Lavasoft MAS)
Behaviour: Trojan, Worm, WormAutorun, IRCBot, MSNWorm, Trojan-Proxy


The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.
The sample has been submitted by Lavasoft customers.

Summary
Technical Details
Removal Recommendations

MD5: 3dd4700eaeecf9d09f2816850d1be03a
SHA1: bea7519b2d69027bdce9ae2bef2f6a177dd1d416
SHA256: 46d8388cac43423595ed426a201ba2b80da3035ed70545a46d4d1c31a3d4e6a5
SSDeep: 12288: K2mhAMJ/cPlS4Rvox0BKJhz OISqybOfIDC8hAIQ7 pS8cuGl9:v2O/GlSD1gOLrOfIW8yIQ7ppuM
Size: 493122 bytes
File type: broken
Platform: WIN32
Entropy: Packed
PEID: UPolyXv05_v6
Company: no certificate found
Created at: 2012-06-09 16:19:49
Analyzed on: WindowsXP SP3 32-bit


Summary:

Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).

Payload

Behaviour Description
WormAutorun A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Trojan's file once a user opens a drive's folder in Windows Explorer.
IRCBot A bot can communicate with command and control servers via IRC channel.
MSNWorm A worm can spread its copies through the MSN Messanger.
Trojan-Proxy This program can launch a proxy server (SOCKS4) on a designated TCP port.


Process activity

The Trojan creates the following process(es):

%original file name%.exe:1428
msn.exe:1168
msn.exe:864

The Trojan injects its code into the following process(es):
No processes have been created.

File activity

The process %original file name%.exe:1428 makes changes in the file system.
The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Y44D\msn.exe (900072 bytes)

The Trojan deletes the following file(s):

%Documents and Settings%\%current user%\Y44D\__tmp_rar_sfx_access_check_3190296 (0 bytes)

The process msn.exe:1168 makes changes in the file system.
The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\aut49.tmp (68608 bytes)
%Documents and Settings%\%current user%\N61Q11.FF6 (67072 bytes)

The Trojan deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\aut49.tmp (0 bytes)
%Documents and Settings%\%current user%\N61Q11.FF6 (0 bytes)

The process msn.exe:864 makes changes in the file system.
The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\desktop.ini (67 bytes)
%WinDir%\csrss.exe (743924 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)

Registry activity

The process %original file name%.exe:1428 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "DF 89 ED E4 D1 BB 15 1B 5D 9C B8 33 E5 60 DC D1"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Документы"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Desktop" = "%Documents and Settings%\%current user%\Рабочий стол"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{91167d45-103d-11db-8c91-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{d8c0d8da-77bd-11e0-bb02-000c293bc0fd}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{91167d42-103d-11db-8c91-806d6172696f}]
"BaseClass" = "Drive"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Desktop" = "%Documents and Settings%\All Users\Рабочий стол"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Y44D]
"msn.exe" = "msn"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Personal" = "%Documents and Settings%\%current user%\Мои документы"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{ebcf8d94-66db-11de-b228-806d6172696f}]
"BaseClass" = "Drive"

The Trojan modifies IE settings for security zones to map all urls to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"IntranetName" = "1"

The Trojan modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

"UNCAsIntranet" = "1"

The Trojan modifies IE settings for security zones to map all web-nodes that bypassing the proxy to the Intranet Zone:

"ProxyBypass" = "1"

The process msn.exe:1168 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "1A 7E 18 52 34 6F CA D0 15 51 00 92 3E D9 88 1A"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{91167d45-103d-11db-8c91-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{91167d42-103d-11db-8c91-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{ebcf8d94-66db-11de-b228-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{d8c0d8da-77bd-11e0-bb02-000c293bc0fd}]
"BaseClass" = "Drive"

The process msn.exe:864 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "91 B0 36 A3 DE 3F 5F 22 56 37 45 EE 34 14 EA 65"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache2"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CacheLimit" = "65324"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CacheLimit" = "65324"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"History" = "%Documents and Settings%\%current user%\Local Settings\History"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Directory" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path4]
"CacheLimit" = "65324"
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache4"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache3"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Paths" = "4"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CacheLimit" = "65324"

To automatically run itself each time Windows is booted, the Trojan adds the following link to its file to the system registry autorun key:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"Remote Registry Service" = "csrss.exe"

Network activity (URLs)

URL IP
hxxp://www.whatismyip.com/ 141.101.120.15
hxxp://checkip.dyndns.com/
vids.p0rn-lover.us 82.145.57.209
checkip.dyndns.org 216.146.39.70


HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Trojan's file once a user opens a drive's folder in Windows Explorer.

A worm can spread its copies through the MSN Messanger.


Remove it with Ad-Aware

  1. Click (here) to download and install Ad-Aware Free Antivirus.
  2. Update the definition files.
  3. Run a full scan of your computer.


Manual removal*

  1. Terminate malicious process(es) (How to End a Process With the Task Manager):

    %original file name%.exe:1428
    msn.exe:1168
    msn.exe:864

  2. Delete the original Trojan file.
  3. Delete or disinfect the following files created/modified by the Trojan:

    %Documents and Settings%\%current user%\Y44D\msn.exe (900072 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\aut49.tmp (68608 bytes)
    %Documents and Settings%\%current user%\N61Q11.FF6 (67072 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\desktop.ini (67 bytes)
    %WinDir%\csrss.exe (743924 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)

  4. Delete the following value(s) in the autorun key (How to Work with System Registry):

    [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
    "Remote Registry Service" = "csrss.exe"

  5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  6. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
  7. Reboot the computer.

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.