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TrojanPSW.Win32.Zbot_a5285a042a


HEUR:Trojan.Win32.Generic (Kaspersky), Trojan.Win32.Generic!BT (VIPRE), Virus.Win32.Cryptor!IK (Emsisoft), Trojan-PSW.Win32.Zbot.6.FD, Trojan.Win32.Swrort.3.FD, BackdoorCaphaw_QKKBAL.YR, GenericInjector.YR, GenericIRCBot.YR, TrojanPSWZbot.YR, PUPTorClient.YR (Lavasoft MAS)Behaviour: Trojan-PSW, Trojan, Backdoor, Virus, PUP, IRCBot

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

Summary

MD5: a5285a042a0e2ff008426e3a4edfc19d

SHA1: 7f4592aafc470583a90f119a431a385bc19c5fa6

SHA256: f920fb10b69e15862c2be5ff77416fa3faaf596d162b2073ad3ff3c9990891a6

SSDeep: 49152:2Pg3LvO1DXZfHBZ5tLEC w12ch0YdrTRgfb5UMkAOuIqbZAxs3sL8DKdvDOpC:2qO1DBhyc1D7h6VgTAWgKd7Op

Size: 16789224 bytes

File type: EXE

Platform: WIN32

Entropy: Not Packed

PEID: MicrosoftVisualCv71EXE, MicrosoftVisualCv70, UPolyXv05_v6

Company: no certificate found

Created at: 2010-05-10 10:36:39

Summary: Trojan-PSW. Trojan program intended for stealing users passwords.

Dynamic Analysis

Payload

Behaviour Description
IRCBotA bot can communicate with command and control servers via IRC channel.


Process activity

The Trojan-PSW creates the following process(es):

%original file name%.exe:1216
iexplore.exe:700
iexplore.exe:444
iexplore.exe:1484
iexplore.exe:504
efsus.exe:316

The Trojan-PSW injects its code into the following process(es):

iexplore.exe:1920
iexplore.exe:808
ctfmon.exe:536

File activity

The process iexplore.exe:444 makes changes in the file system.


The Trojan-PSW creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\OpenCL.dll (51200 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)

The process iexplore.exe:1920 makes changes in the file system.


The Trojan-PSW creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\OpenCL.dll (51200 bytes)

The process iexplore.exe:808 makes changes in the file system.


The Trojan-PSW creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.tmp.tmp (12251746 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.new (3167067 bytes)
%Documents and Settings%\%current user%\Application Data\tor\hidden_service\hostname.tmp (24 bytes)
%Documents and Settings%\%current user%\Application Data\tor\state.tmp (376 bytes)

The Trojan-PSW deletes the following file(s):

%Documents and Settings%\%current user%\Application Data\tor\hidden_service\hostname (0 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors (0 bytes)
%Documents and Settings%\%current user%\Application Data\tor\state (0 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.new (0 bytes)

The process iexplore.exe:1484 makes changes in the file system.


The Trojan-PSW creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\tor\unverified-consensus.tmp (1087599 bytes)
%Documents and Settings%\%current user%\Application Data\tor\state.tmp (222 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.tmp.tmp (15090044 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-consensus.tmp (1087599 bytes)
%Documents and Settings%\%current user%\Application Data\tor\hidden_service\hostname.tmp (24 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-certs.tmp (16400 bytes)
%Documents and Settings%\%current user%\Application Data\tor\hidden_service\private_key.tmp (902 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.new (3016013 bytes)

The Trojan-PSW deletes the following file(s):

%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors (0 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.new (0 bytes)
%Documents and Settings%\%current user%\Application Data\tor\unverified-consensus (0 bytes)

Registry activity

The process %original file name%.exe:1216 makes changes in the system registry.


The Trojan-PSW creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "46 02 FF E3 C1 90 31 D7 2A 0C D0 C4 E4 01 49 A2"

The process iexplore.exe:444 makes changes in the system registry.


The Trojan-PSW creates and/or sets the following values in system registry:

[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\path2]
"CacheLimit" = "65324"

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

"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\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

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

[HKLM\System\CurrentControlSet\Hardware Profiles\0001\Software\Microsoft\windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "3C 00 00 00 2F 00 00 00 01 00 00 00 00 00 00 00"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "82 48 51 AA 45 D7 06 26 FC 02 12 B5 64 47 5B 5D"

[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"

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

[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\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"

The Trojan-PSW 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:

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

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

"ProxyBypass" = "1"

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Trojan-PSW 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-PSW deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"
"ProxyServer"
"ProxyOverride"

The process iexplore.exe:1920 makes changes in the system registry.


The Trojan-PSW creates and/or sets the following values in system registry:

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

[HKCU\Software\Microsoft\Obumut]
"Ifyxveuw" = "B5 8A F3 61 5E 83 18 24 7E 1D 9A 36 E2 82 88 DF"

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

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

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

"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\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

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

[HKLM\System\CurrentControlSet\Hardware Profiles\0001\Software\Microsoft\windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path4]
"CacheLimit" = "65324"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "3C 00 00 00 31 00 00 00 01 00 00 00 00 00 00 00"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "6B 4A D4 A5 17 01 6C 25 18 90 5B 26 23 8B EC 6E"

[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"

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

[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\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"

The Trojan-PSW 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:

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

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

"ProxyBypass" = "1"

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Trojan-PSW 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-PSW deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"
"ProxyServer"
"ProxyOverride"

The process iexplore.exe:808 makes changes in the system registry.


The Trojan-PSW creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "9A 26 E2 91 15 46 DE F5 19 7F CE 1A C4 38 C0 BD"

[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"

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

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

[HKCU\Software\Microsoft\Obumut]
"Ifyxveuw" = "B5 8A F3 61 5E 83 18 24 7E 1D 9A 36 E2 82 88 DF"

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

The process iexplore.exe:1484 makes changes in the system registry.


The Trojan-PSW creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "C3 3C C0 B0 3A B7 DC B8 CC 3A E3 5A 82 EB 95 F9"

[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"

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

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

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

The process ctfmon.exe:536 makes changes in the system registry.


The Trojan-PSW creates and/or sets the following values in system registry:

[HKCU\Software\Microsoft\Obumut]
"Ifyxveuw" = "B5 8A F3 61 5E 83 18 24 7E 1D 9A 36 E2 82 88 DF"

The Trojan-PSW deletes the following value(s) in system registry:


The Trojan-PSW disables automatic startup of the application by deleting the following autorun value:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"internat.exe"

The process efsus.exe:316 makes changes in the system registry.


The Trojan-PSW creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "84 60 6F A7 0B F7 62 7A F5 4B CC 02 C6 DE F8 3B"

Network activity (URLs)

URL IP
hxxp://checkip.dyndns.com/
checkip.dyndns.org216.146.39.70


HOSTS file anomalies

No changes have been detected.

Rootkit activity

The Trojan-PSW installs the following user-mode hooks in WININET.dll:

HttpSendRequestExA
HttpSendRequestW
InternetReadFileExA
InternetQueryDataAvailable
HttpSendRequestExW
InternetReadFile
HttpQueryInfoA
HttpSendRequestA
InternetCloseHandle

The Trojan-PSW installs the following user-mode hooks in CRYPT32.dll:

PFXImportCertStore

The Trojan-PSW installs the following user-mode hooks in USER32.dll:

SetCursorPos
DefMDIChildProcA
DefFrameProcA
DefDlgProcA
GetClipboardData
DefMDIChildProcW
DefFrameProcW
GetUpdateRgn
RegisterClassA
GetDCEx
ReleaseCapture
SetCapture
DefWindowProcA
CallWindowProcA
GetUpdateRect
PeekMessageA
CallWindowProcW
GetMessagePos
GetCursorPos
EndPaint
BeginPaint
DefWindowProcW
RegisterClassExA
GetMessageA
DefDlgProcW
SwitchDesktop
OpenInputDesktop
RegisterClassExW
RegisterClassW
GetCapture
PeekMessageW
GetMessageW
GetWindowDC
TranslateMessage
GetDC
ReleaseDC

The Trojan-PSW installs the following user-mode hooks in WS2_32.dll:

WSASend
send
closesocket

The Trojan-PSW installs the following user-mode hooks in kernel32.dll:

GetFileAttributesExW

The Trojan-PSW installs the following user-mode hooks in ntdll.dll:

LdrLoadDll
NtCreateThread

Propagation

Removals

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. Scan a system with an anti-rootkit tool.
  2. Terminate malicious process(es) (How to End a Process With the Task Manager):

    %original file name%.exe:1216
    iexplore.exe:700
    iexplore.exe:444
    iexplore.exe:1484
    iexplore.exe:504
    efsus.exe:316

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

    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\desktop.ini (67 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\OpenCL.dll (51200 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.tmp.tmp (12251746 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.new (3167067 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\hidden_service\hostname.tmp (24 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\state.tmp (376 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\unverified-consensus.tmp (1087599 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\cached-consensus.tmp (1087599 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\cached-certs.tmp (16400 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\hidden_service\private_key.tmp (902 bytes)

  5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  6. Reboot the computer.
*Manual removal may cause unexpected system behaviour and should be performed at your own risk.

Static Analysis

Network Activity

Map

Strings from Dumps