Trojan-PSW.Win32.Zbot_486f4ca0fa

by malwarelabrobot on December 10th, 2013 in Malware Descriptions.

Gen:Heur.Codenox.1 (BitDefender), HEUR:Trojan.Win32.Generic (Kaspersky), Trojan.Win32.Generic!BT (VIPRE), Trojan.PWS.Panda.786 (DrWeb), Gen:Heur.Codenox.1 (B) (Emsisoft), Artemis!486F4CA0FA20 (McAfee), Trojan-Spy.Win32.Zbot (Ikarus), Gen:Heur.Codenox.1 (FSecure), PSW.Agent.ARWB (AVG), Trojan-PSW.Win32.Zbot.6.FD, GenericInjector.YR, BackdoorCaphaw_QKKBAL.YR, TrojanPSWZbot.YR (Lavasoft MAS)
Behaviour: Trojan-Spy, Trojan-PSW, Trojan, Backdoor


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: 486f4ca0fa201e8653da155dc64a0f95
SHA1: 30526c608159ed566f4f7db319ec06b522342520
SHA256: aad0c5fe87656629b9b577d34ad74d390cab923bc03b0a66d0c177d96aea33ed
SSDeep: 6144:vCahN7rlVTgI1vEAMowQ6ug7 ia LhLmAVz8EcRjvPumtYJm6Ext3lSs:vCaJaI1cvowQlg7 1u4jjXHOm5
Size: 358455 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: BorlandDelphi30, UPolyXv05_v6
Company: no certificate found
Created at: 1970-01-01 03:00:57


Summary:

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

Payload

No specific payload has been found.

Process activity

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

ylfee.exe:1156
bot.exe:436

File activity

The process bot.exe:436 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\Voufux\ylfee.exe (141 bytes)
%Documents and Settings%\%current user%\Local Settings\Application Data\Xenocode\Sandbox\1.0.0.0\2013.11.27T22.19\Virtual\XRegistry.tmp (15 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\tmpfe706ba3.bat (207 bytes)
%Documents and Settings%\%current user%\Local Settings\Application Data\Xenocode\Sandbox\1.0.0.0\2013.11.27T22.19\Native\STUBEXE\@SYSTEM@\cmd.exe (16 bytes)
%Documents and Settings%\%current user%\Local Settings\Application Data\Xenocode\Sandbox\1.0.0.0\2013.11.27T22.19\Native\STUBEXE\@APPDATA@\Voufux\ylfee.exe (16 bytes)

Registry activity

The process ylfee.exe:1156 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" = "B0 67 A2 B7 12 E6 BA BD CB 17 68 86 9B 97 53 6C"

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

[HKCU\Software\Microsoft\Arga]
"Atnayhynu" = "F8 9D 50 24 B4 A8 2F B6 AC B1 2D 02 98 E1 E5 F9"

The process bot.exe:436 makes changes in the system registry.
The Trojan-PSW creates and/or sets the following values in system registry:

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

[HKCU\Software\Microsoft\Arga]
"Atnayhynu" = "F8 9D 50 24 B4 A8 2F B6 AC B1 2D 02 98 E1 E5 F9"

Network activity (URLs)

URL IP
hxxp://207.45.187.138/~knohfezt/upload/config.bin


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):

    ylfee.exe:1156
    bot.exe:436

  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\Voufux\ylfee.exe (141 bytes)
    %Documents and Settings%\%current user%\Local Settings\Application Data\Xenocode\Sandbox\1.0.0.0\2013.11.27T22.19\Virtual\XRegistry.tmp (15 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\tmpfe706ba3.bat (207 bytes)
    %Documents and Settings%\%current user%\Local Settings\Application Data\Xenocode\Sandbox\1.0.0.0\2013.11.27T22.19\Native\STUBEXE\@SYSTEM@\cmd.exe (16 bytes)
    %Documents and Settings%\%current user%\Local Settings\Application Data\Xenocode\Sandbox\1.0.0.0\2013.11.27T22.19\Native\STUBEXE\@APPDATA@\Voufux\ylfee.exe (16 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.