Trojan-PSW.Win32.Zbot.4_dc8b7c2aad

by malwarelabrobot on August 30th, 2013 in Malware Descriptions.

Trojan.Win32.Inject.gbzb (Kaspersky), Trojan.Win32.Generic!SB.0 (VIPRE), Trojan-PSW.Win32.Tepfer!IK (Emsisoft), Trojan-PSW.Win32.Zbot.4.FD, GenericInjector.YR (Lavasoft MAS)
Behaviour: Trojan-PSW, Trojan


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: dc8b7c2aadeaaf0af1391994ed3fcd8a
SHA1: 1e6aded7a2522324a81e96433a1cde770578da61
SHA256: 6a07deef80a0d28b69de4850ac23a870ce28d82d3ff1074c4c73e36a1f817749
SSDeep: 6144:rnCDecW65WFA6q0q/V3FL2s7iHfUutNGQvDwjpZEO4x15I:rnOe5SSUx/nCR3TGQEjyo
Size: 310272 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: UPolyXv05_v6
Company: no certificate found
Created at: 2013-06-16 14:22:34


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):

dc8b7c2aadeaaf0af1391994ed3fcd8a.exe:1848
ojlir.exe:492

File activity

The process dc8b7c2aadeaaf0af1391994ed3fcd8a.exe:1848 makes changes in a file system.
The Trojan-PSW creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\OOI6C84.bat (173 bytes)
%Documents and Settings%\%current user%\Application Data\Ocka\ojlir.exe (1735 bytes)

The process ojlir.exe:492 makes changes in a file system.
The Trojan-PSW creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\NTUSER.DAT.LOG (7080 bytes)
%Documents and Settings%\%current user%\NTUSER.DAT (5660 bytes)

Registry activity

The process dc8b7c2aadeaaf0af1391994ed3fcd8a.exe:1848 makes changes in a system registry.
The Trojan-PSW creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A2 CC 34 F8 E0 74 8F 23 C8 3B 45 4C 05 16 DC F6"

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

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

The process ojlir.exe:492 makes changes in a system registry.
The Trojan-PSW creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "6B B9 54 21 A3 3B 32 92 AA A5 7B 0C D7 40 8D 2E"

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

[HKCU\Software\Microsoft\Erlyvojoxiw]
"2c63b866" = "31 8A 05 82 A1 36 D8 69 29 DC 42 C7 9B 77 52 05"

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

Network activity (URLs)

URL IP
hxxp://www.google.com/ 173.194.43.81
hxxp://www.google.ca/?gws_rd=cr 173.194.43.95


Rootkit activity

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

HttpSendRequestExA
HttpSendRequestW
InternetReadFileExA
InternetWriteFile
InternetWriteFileExA
InternetQueryDataAvailable
HttpQueryInfoW
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:

GetClipboardData
TranslateMessage

The Trojan-PSW installs the following user-mode hooks in Secur32.dll:

DecryptMessage
SealMessage
DeleteSecurityContext

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

WSAGetOverlappedResult
WSASend
recv
gethostbyname
WSARecv
send
closesocket
freeaddrinfo
getaddrinfo
GetAddrInfoW

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):

    dc8b7c2aadeaaf0af1391994ed3fcd8a.exe:1848
    ojlir.exe:492

  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\Temp\OOI6C84.bat (173 bytes)
    %Documents and Settings%\%current user%\Application Data\Ocka\ojlir.exe (1735 bytes)
    %Documents and Settings%\%current user%\NTUSER.DAT.LOG (7080 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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