Trojan-PSW.Win32.Zbot_55ff881eaf

by malwarelabrobot on November 13th, 2013 in Malware Descriptions.

HEUR:Trojan.Win32.Generic (Kaspersky), Trojan.Win32.Generic!BT (VIPRE), Trojan.SuspectCRC!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, PUP, IRCBot


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

Summary
Technical Details
Removal Recommendations

MD5: 55ff881eafe0472645c74203c2688301
SHA1: f681c96874f604c39c2a9915f142ef62f4b48cce
SHA256: 7bcc1f07a1d9888f4485fc7d138ecbfc98bf66eec5d10f1a288bde82a54182e8
SSDeep: 393216:DU4CIlwtqYPm0J4h1jpd6wzU48rM3aycNfYxKPIlvHCkPBwTxxsmX:/bwqYtChFnSOlcNfYYPIlvHjDC
Size: 18272256 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: MicrosoftVisualCv71EXE, MicrosoftVisualCv70, UPolyXv05_v6
Company: WinterSoft
Created at: 2011-11-22 19:29:03


Summary:

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

Payload

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


Process activity

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

iexplore.exe:604
iexplore.exe:1532
iexplore.exe:1412
iexplore.exe:500
%original file name%.exe:1828
raogo.exe:448

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

iexplore.exe:1608
iexplore.exe:1928
ctfmon.exe:1224

File activity

The process iexplore.exe:1608 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 (5188791 bytes)
%Documents and Settings%\%current user%\Application Data\tor\CACHED-DESCRIPTORS.NEW (791453 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 (374 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:1532 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:1928 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:1412 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\state.tmp (222 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.tmp.tmp (26488824 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-consensus.tmp (1079410 bytes)
%Documents and Settings%\%current user%\Application Data\tor\hidden_service\hostname.tmp (24 bytes)
%Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.new (5126152 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-certs.tmp (16400 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)

Registry activity

The process iexplore.exe:1608 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" = "05 ED 31 30 6D 00 4F 9A 4D E8 20 05 42 1B 11 6F"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{91167d45-103d-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"

[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\Ofyk]
"Ihwiotqi" = "7C E3 51 3C DE 50 7A E6 BE 95 BF 04 BC 4E D8 C0"

The process iexplore.exe:1532 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" = "8E 12 33 59 70 7F 19 CB 97 4C 5E FF 7D 00 57 B6"

[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:1928 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\Ofyk]
"Ihwiotqi" = "7C E3 51 3C DE 50 7A E6 BE 95 BF 04 BC 4E D8 C0"

[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" = "3F FC 40 AD D7 4B D0 DE E6 FD 60 0B C3 56 D2 3A"

[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:1412 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" = "63 B4 A6 09 56 62 42 B8 A6 87 17 BB E5 CE 27 38"

[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:1224 makes changes in the system registry.
The Trojan-PSW creates and/or sets the following values in system registry:

[HKCU\Software\Microsoft\Ofyk]
"Ihwiotqi" = "7C E3 51 3C DE 50 7A E6 BE 95 BF 04 BC 4E D8 C0"

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 %original file name%.exe:1828 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" = "81 94 8F 19 14 34 92 41 4C D7 AA 83 9D 53 D5 60"

The process raogo.exe:448 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" = "DD A8 F4 50 C7 0C 46 C2 13 AD 5E 23 37 E4 A7 40"

Network activity (URLs)

URL IP
hxxp://checkip.dyndns.com/
checkip.dyndns.org 216.146.38.70


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


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):

    iexplore.exe:604
    iexplore.exe:1532
    iexplore.exe:1412
    iexplore.exe:500
    %original file name%.exe:1828
    raogo.exe:448

  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%\Application Data\tor\cached-descriptors.tmp.tmp (5188791 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\CACHED-DESCRIPTORS.NEW (791453 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 (374 bytes)
    %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-consensus.tmp (1079410 bytes)
    %Documents and Settings%\%current user%\Application Data\tor\cached-descriptors.new (5126152 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-certs.tmp (16400 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.

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