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Backdoor.Win32.Farfli_dee9fe1686


Trojan.Win32.VBKrypt.hnev (Kaspersky), Trojan.Win32.Generic.pak!cobra (VIPRE), Virus.Win32.VBInject!IK (Emsisoft), Backdoor.Win32.Farfli.FD, Backdoor.Win32.Xtrat.FD, Trojan.Win32.IEDummy.FD, GenericAutorunWorm.YR, GenericInjector.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.

Summary

MD5: dee9fe16865803ebd8263920cf1dcfac

SHA1: 71e5a272b91be617229fba527696e3c205838726

SHA256: 665460b857ac2b211a2aa32347d60e3477a2be2b3123668a77be3cc9a33b267e

SSDeep: 12288:8xTQJW4nwhCcWha12yK4HY9YUVzYKj86s1SR:8xTQg4whPOa125CvUpYOP

Size: 460800 bytes

File type:

Platform:

Entropy:

PEID: ASProtectv123RC1, ASProtect13321Registered, ASProtectv12xNewStrain, UPolyXv05_v6

Company: no certificate found

Created at: no data

Analyzed on: WindowsXP SP3 32-bit

Summary: Backdoor. Malware that enables a remote control of victim's machine.

Dynamic Analysis

Payload

Behaviour Description
WormAutorunA 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):

%original file name%.exe:252
%original file name%.exe:1124

The Backdoor injects its code into the following process(es):

iexplore.exe:2004

File activity

The process %original file name%.exe:252 makes changes in the file system.


The Backdoor deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\x.html (0 bytes)

The process iexplore.exe:2004 makes changes in the file system.


The Backdoor creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\Microsoft\Windows\svcshoste.dat (314 bytes)
%System%\win323\svcshost.exe (3073 bytes)

Registry activity

The process %original file name%.exe:252 makes changes in the system registry.


The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "4A 2E 91 50 29 22 FB BC FE 70 EE EA 36 3C FB AB"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"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\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\XtremeRAT]
"Mutex" = "svcshoste"

The process %original file name%.exe:1124 makes changes in the system registry.


The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CB CC 2E F6 8C 7F F7 C4 3C 02 6A 2D 08 3B 6A CC"

[HKCR\TypeLib\{3274851D-3EB3-34B8-E22E-F3BD9B7C4791}\1.0\HELPDIR]
"(Default)" = ""

[HKCR\TypeLib\{3274851D-3EB3-34B8-E22E-F3BD9B7C4791}\1.0]
"(Default)" = ""

[HKCR\TypeLib\{3274851D-3EB3-34B8-E22E-F3BD9B7C4791}\1.0\0\win32]
"(Default)" = ""

[HKCU\Software\ASProtect\SpecData]
"0D3FD9710D3FD971" = "0E EC 1D D0 69 0B ED 63 4E 1B 93 34 7C BD 89 2E"

[HKCR\CLSID\{E743CB98-99E1-4688-F6B4-65AB96D4E868}\Version]
"(Default)" = ""

[HKCR\TypeLib\{3274851D-3EB3-34B8-E22E-F3BD9B7C4791}\1.0\FLAGS]
"(Default)" = ""

[HKCR\CLSID\{E743CB98-99E1-4688-F6B4-65AB96D4E868}\TypeLib]
"(Default)" = ""

[HKCR\TypeLib\{3274851D-3EB3-34B8-E22E-F3BD9B7C4791}\1.0\0]
"(Default)" = ""

[HKCR\CLSID\{E743CB98-99E1-4688-F6B4-65AB96D4E868}\ProgID]
"(Default)" = ""

[HKCR\CLSID\{E743CB98-99E1-4688-F6B4-65AB96D4E868}]
"(Default)" = "Ebohe Qexike object"

[HKCR\.key]
"(Default)" = ""

[HKCU\Software\ASProtect\SpecData]
"(Default)" = "0D3FD9710D3FD971"

[HKCR\CLSID\{E743CB98-99E1-4688-F6B4-65AB96D4E868}\InProcServer32]
"(Default)" = ""

[HKCR\TypeLib\{3274851D-3EB3-34B8-E22E-F3BD9B7C4791}]
"(Default)" = ""

The process iexplore.exe:2004 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" = "65452"
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache4"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "3C 00 00 00 12 00 00 00 01 00 00 00 00 00 00 00"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKLM\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication]
"ID" = "1208111653"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache2"

[HKCU\Software\svcshoste]
"ServerName" = "%System%\win323\svcshost.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKLM\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication]
"Name" = "iexplore.exe"

[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" = "65452"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CacheLimit" = "65452"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CE 5C 66 C9 36 8B AB 2C 91 5C D8 08 C7 BE 7B 73"

[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" = "65452"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

[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"

[HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\{8J04GL8D-SN6V-CL8C-1788-4HMF83PQE24W}]
"StubPath" = "%System%\win323\svcshost.exe restart"

[HKCU\Software\svcshoste]
"ServerStarted" = "18/12/2013 03:19:20"

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

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]
"MIC" = "%System%\win323\svcshost.exe"

Proxy settings are disabled:

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

To automatically run itself each time Windows is booted, the Backdoor adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"MICRO" = "%System%\win323\svcshost.exe"

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

"ProxyBypass" = "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:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"microsof" = "%System%\win323\svcshost.exe"

The Backdoor deletes the following value(s) in system registry:

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

Network activity (URLs)

No activity has been detected.

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.

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. Terminate malicious process(es) (How to End a Process With the Task Manager):

    %original file name%.exe:252
    %original file name%.exe:1124

  2. Delete the original Backdoor file.
  3. Delete or disinfect the following files created/modified by the Backdoor:

    %Documents and Settings%\%current user%\Application Data\Microsoft\Windows\svcshoste.dat (314 bytes)
    %System%\win323\svcshost.exe (3073 bytes)

  4. Delete the following value(s) in the autorun key (How to Work with System Registry):

    [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
    "MIC" = "%System%\win323\svcshost.exe"

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "MICRO" = "%System%\win323\svcshost.exe"

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "microsof" = "%System%\win323\svcshost.exe"

  5. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
  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