Backdoor.Win32.Farfli_7c20e824d3
HEUR:Trojan.Win32.Generic (Kaspersky), Trojan.Win32.Rimecud.di (v) (VIPRE), Virus.Win32.Cryptor!IK (Emsisoft), Backdoor.Win32.Farfli.FD, Trojan.Win32.Rimecud.FD, Trojan.Win32.Swrort.3.FD, mzpefinder_pcap_file.YR, GenericAutorunWorm.YR, BackdoorFarfli.YR (Lavasoft MAS)
Behaviour: Trojan, Backdoor, Worm, Virus, WormAutorun
The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.
MD5: 7c20e824d36327df42dccd0e5f40d706
SHA1: 385d149569a8a7b2ae91e6614b281e3128e1e033
SHA256: 14a06e138c5a726485e97c7ecb497ea47125d345c5e96cf0ff13e486cec81287
SSDeep: 3072:jmigWPMjZv83afF7fsMH1m4TPhL1HwThmvGEeL47F9k0f2f Ic1jB:UVV51HwTwM4R9x
Size: 166912 bytes
File type: EXE
Platform: WIN32
Entropy: Not Packed
PEID: UPolyXv05_v6, MicrosoftVisualC, MicrosoftVisualCv50v60MFC, MicrosoftVisualC50, Armadillov171
Company: no certificate found
Created at: 2009-05-12 04:41:50
Summary:
Backdoor. Malware that enables a remote control of victim's machine.
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 Backdoor's file once a user opens a drive's folder in Windows Explorer. |
Process activity
The Backdoor creates the following process(es):
The Backdoor injects its code into the following process(es):
5938020.exe:1100
File activity
The process 5938020.exe:1100 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):
%Documents and Settings%\%current user%\Local Settings\Temp\uyulasks5D0ACBD6.tmp (180736 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\c35E61D9A.tmp (180998 bytes)
%Documents and Settings%\%current user%\Cookies\index.dat (12288 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\biqxrgvx5AAFDDE0.tmp (4 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\lnttbvzmepC30FBB3B.tmp (72 bytes)
%Documents and Settings%\%current user%\Cookies\[email protected][1].txt (70 bytes)
Registry activity
The process 5938020.exe:1100 makes changes in the system registry.
The Backdoor 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 0D 00 00 00 01 00 00 00 00 00 00 00"
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "45 D1 F1 3E 25 F7 77 85 A2 FB DF E1 23 E7 8F 53"
[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 Backdoor 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"
To automatically run itself each time Windows is booted, the Backdoor adds the following link to its file to the system registry autorun key:
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"gyroujoo" = "%System%\nena.exe"
The Backdoor modifies IE settings for security zones to map all web-nodes that bypassing the proxy to the Intranet Zone:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"ProxyBypass" = "1"
Proxy settings are disabled:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"
The Backdoor 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 Backdoor deletes the following value(s) in system registry:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"
"ProxyServer"
"ProxyOverride"
Network activity (URLs)
| URL | IP |
|---|---|
| hxxp://loca.betrule.com/cib.exe |  37.123.118.232 |
| hxxp://find-ip-address.org/ |  |
| hxxp://www.showipaddress.com/ |  74.117.222.18 |
| hxxp://www.ip-adress.com/ | 64.34.169.244 |
| hxxp://www.grokster.com/ | 72.14.188.13 |
| hxxp://cnn-56m.gslb.vgtf.net/ | |
| hxxp://www.amazon.com/ | 176.32.98.166 |
| hxxp://us.co1.cb3.glbdns.microsoft.com/ |  |
| hxxp://www.go.com/ | 199.181.132.250 |
| www.cnn.com | 157.166.249.10 |
| www.msn.com | 131.253.40.1 |
| www.find-ip-address.org | 208.76.87.68 |
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 Backdoor's file once a user opens a drive's folder in Windows Explorer.
Remove it with Ad-Aware
- Click (here) to download and install Ad-Aware Free Antivirus.
- Update the definition files.
- Run a full scan of your computer.
Manual removal*
- Terminate the original Backdoor's process (How to End a Process With the Task Manager).
- Delete the original Backdoor file.
- Delete or disinfect the following files created/modified by the Backdoor:
%Documents and Settings%\%current user%\Local Settings\Temp\uyulasks5D0ACBD6.tmp (180736 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\c35E61D9A.tmp (180998 bytes)
%Documents and Settings%\%current user%\Cookies\index.dat (12288 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\biqxrgvx5AAFDDE0.tmp (4 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\lnttbvzmepC30FBB3B.tmp (72 bytes)
%Documents and Settings%\%current user%\Cookies\[email protected][1].txt (70 bytes) - Delete the following value(s) in the autorun key (How to Work with System Registry):
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"gyroujoo" = "%System%\nena.exe" - Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
- Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
- Reboot the computer.
*Manual removal may cause unexpected system behaviour and should be performed at your own risk.
