Backdoor.Win32.Farfli_9c1f962f88

by malwarelabrobot on June 15th, 2014 in Malware Descriptions.

Trojan.Win32.Qhost.atmk (Kaspersky), Gen:Variant.Kazy.212807 (B) (Emsisoft), Gen:Variant.Kazy.212807 (AdAware), Backdoor.Win32.Farfli.FD, Backdoor.Win32.Xtrat.FD, Trojan.Win32.IEDummy.FD, GenericAutorunWorm.YR, GenericInjector.YR (Lavasoft MAS)
Behaviour: Trojan, Backdoor, Worm, WormAutorun


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

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Summary
Dynamic Analysis
Static Analysis
Network Activity
Map
Strings from Dumps
Removals

MD5: 9c1f962f88d4b8e53e0c20b664e37c0a
SHA1: 0750bec119f6b77766164eb3dfd5ecab16cd754b
SHA256: 1d44f73037adf1a0b45b0942d2df143b9ea02c146f5c175828e69da258baf8b5
SSDeep: 3072:asERAkU4EkHc3VwqDkUi H5CNNYn8uOYvYAXrRt8x6o7PivriFAACZb BGObbEy:asERAk9HKYUi H5ye8fY2TC
Size: 216064 bytes
File type: EXE
Platform: WIN32
Entropy: Not Packed
PEID: MicrosoftVisualC, NETexecutable, UPolyXv05_v6
Company: no certificate found
Created at: 2014-06-05 16:26:11
Analyzed on: WindowsXP SP3 32-bit


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):

%original file name%.exe:1272
%original file name%.exe:440

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

svchost.exe:184
iexplore.exe:1176

File activity

The process %original file name%.exe:1272 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application DataMicrosoft\System\Services\18.exe (1281 bytes)
%WinDir%\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config.cch.new (724 bytes)
%WinDir%\Microsoft.NET\Framework\v2.0.50727\CONFIG\enterprisesec.config.cch.new (724 bytes)
%System%\drivers\etc\hosts (421 bytes)

The process %original file name%.exe:440 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)

Registry activity

The process %original file name%.exe:1272 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "6F FA 21 E9 26 9E 76 04 A1 2B E3 1D 8C 03 AD A3"

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

"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

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]
"18.exe" = "%Documents and Settings%\%current user%\Application DataMicrosoft\System\Services\18.exe"

The process %original file name%.exe:440 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8B 9D 26 A8 19 FA 0E 8E 30 58 6A C1 1A 3F 4D 42"

[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" = "--((Mutex))--"

Dropped PE files

There are no dropped PE files.

HOSTS file anomalies

The Backdoor modifies "%System%\drivers\etc\hosts" file which is used to translate DNS entries to IP addresses.
The modified file is 421 bytes in size. The following strings are added to the hosts file listed below:

virscan.org
virustotal.com
virusscan.jotti.org
vscan.novirusthanks.org
free.avg.com
avg.com
norton.com
www.norton.com
avast.com
trendmicro.com
pctools.com
kaskersky.com
www.kaspersky.com
bullguard.com
secunia.com
community.norton.com
av-comparatives.org
computerhope.com
nl.clamwin.com
clamwin.com
mac-forums.com
mcafee.com
barracudanetworks.com
stopzilla.com
free-av.com
symantec.com
eset.com


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.

VersionInfo

Company Name:
Product Name:
Product Version: 0.0.0.0
Legal Copyright:
Legal Trademarks:
Original Filename: 0be1i0ey.exe
Internal Name: 0be1i0ey.exe
File Version: 0.0.0.0
File Description:
Comments:
Language: Language Neutral

PE Sections

Name Virtual Address Virtual Size Raw Size Entropy Section MD5
.text 8192 112324 112640 5.22846 604fcbdf043802854483733ade60a6a9
.rsrc 122880 102400 102400 3.36797 c8e3e86647bf46061f39e34374106678
.reloc 229376 12 512 0.070639 0a7abd25026cbe7a63a32289923ebe7d

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

URLs

No activity has been detected.

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Web Traffic was not found.

The Backdoor connects to the servers at the folowing location(s):

svchost.exe_184:

.text
`.data
.rsrc
ADVAPI32.dll
KERNEL32.dll
NTDLL.DLL
RPCRT4.dll
NETAPI32.dll
ole32.dll
ntdll.dll
RegCloseKey
RegOpenKeyExW
GetProcessHeap
NtOpenKey
svchost.pdb
\PIPE\
Software\Microsoft\Windows NT\CurrentVersion\Svchost
\Registry\Machine\System\CurrentControlSet\Control\SecurePipeServers\
5.1.2600.5512 (xpsp.080413-2111)
svchost.exe
Windows
Operating System
5.1.2600.5512

svchost.exe_184_rwx_10000000_0004A000:

.idata
.rdata
P.reloc
P.rsrc
ServerKeyloggerU
789:;<&'()* ,-./12345
%SERVER%
URLMON.DLL
shell32.dll
http://
advapi32.dll
kernel32.dll
mpr.dll
version.dll
comctl32.dll
gdi32.dll
opengl32.dll
user32.dll
wintrust.dll
msimg32.dll
GetKeyboardType
RegOpenKeyExA
RegCloseKey
oleaut32.dll
RegOpenKeyExW
RegCreateKeyW
GetWindowsDirectoryW
UnhookWindowsHookEx
SetWindowsHookExW
MapVirtualKeyW
GetKeyboardLayout
GetKeyState
shlwapi.dll
SHDeleteKeyW
FindExecutableW
URLDownloadToCacheFileW
wininet.dll
FtpPutFileW
FtpSetCurrentDirectoryW
GetKeyboardState
ShellExecuteW
ntdll.dll
1 1$1(1,10141
KWindows
TServerKeylogger
x.html
HKEY_CLASSES_ROOT
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
HKEY_CURRENT_CONFIG
[Execute]
KeyDelBackspace
.html
XtremeKeylogger
Software\Microsoft\Windows\CurrentVersion\Run
.functions
icon=shell32.dll,4
shellexecute=
autorun.inf
\Microsoft\Windows\
ÞFAULTBROWSER%
svchost.exe
hack29dz.no-ip.biz
castra.exe
C:\Windows\resources\040c
{4EDA76E2-L5SW-M831-7M3H-6L62HA1N282U}
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
C:\HKCU
Êstra%
Microsoft\Windows\Start Men
ftp.ftpserver.com
ftpuser

iexplore.exe_1176:

%?9-*09,*19}*09
.text
`.data
.rsrc
msvcrt.dll
KERNEL32.dll
NTDLL.DLL
USER32.dll
SHLWAPI.dll
SHDOCVW.dll
Software\Microsoft\Windows\CurrentVersion\Explorer\BrowseNewProcess
IE-X-X
rsabase.dll
System\CurrentControlSet\Control\Windows
dw15 -x -s %u
watson.microsoft.com
IEWatsonURL
%s -h %u
iedw.exe
Iexplore.XPExceptionFilter
jscript.DLL
mshtml.dll
mlang.dll
urlmon.dll
wininet.dll
shdocvw.DLL
browseui.DLL
comctl32.DLL
IEXPLORE.EXE
iexplore.pdb
ADVAPI32.dll
MsgWaitForMultipleObjects
IExplorer.EXE
IIIIIB(II<.Fg
7?_____ZZSSH%
)z.UUUUUUUU
,....Qym
````2```
{.QLQIIIKGKGKGKGKGKG
;33;33;0
8888880
8887080
browseui.dll
shdocvw.dll
6.00.2900.5512 (xpsp.080413-2105)
Windows
Operating System
6.00.2900.5512

iexplore.exe_1176_rwx_10000000_0004A000:

.idata
.rdata
P.reloc
P.rsrc
ServerKeyloggerU
789:;<&'()* ,-./12345
%SERVER%
URLMON.DLL
shell32.dll
http://
advapi32.dll
kernel32.dll
mpr.dll
version.dll
comctl32.dll
gdi32.dll
opengl32.dll
user32.dll
wintrust.dll
msimg32.dll
GetKeyboardType
RegOpenKeyExA
RegCloseKey
oleaut32.dll
RegOpenKeyExW
RegCreateKeyW
GetWindowsDirectoryW
UnhookWindowsHookEx
SetWindowsHookExW
MapVirtualKeyW
GetKeyboardLayout
GetKeyState
shlwapi.dll
SHDeleteKeyW
FindExecutableW
URLDownloadToCacheFileW
wininet.dll
FtpPutFileW
FtpSetCurrentDirectoryW
GetKeyboardState
ShellExecuteW
ntdll.dll
1 1$1(1,10141
KWindows
TServerKeylogger
x.html
HKEY_CLASSES_ROOT
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
HKEY_CURRENT_CONFIG
[Execute]
KeyDelBackspace
.html
XtremeKeylogger
Software\Microsoft\Windows\CurrentVersion\Run
.functions
icon=shell32.dll,4
shellexecute=
autorun.inf
\Microsoft\Windows\
ÞFAULTBROWSER%
svchost.exe
hack29dz.no-ip.biz
castra.exe
C:\Windows\resources\040c
{4EDA76E2-L5SW-M831-7M3H-6L62HA1N282U}
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
C:\HKCU
Êstra%
Microsoft\Windows\Start Men
ftp.ftpserver.com
ftpuser
c:\%original file name%.exe
%Program Files%\Internet Explorer\iexplore.exe


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:1272
    %original file name%.exe:440

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

    %Documents and Settings%\%current user%\Application DataMicrosoft\System\Services\18.exe (1281 bytes)
    %WinDir%\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config.cch.new (724 bytes)
    %WinDir%\Microsoft.NET\Framework\v2.0.50727\CONFIG\enterprisesec.config.cch.new (724 bytes)
    %System%\drivers\etc\hosts (421 bytes)

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

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "18.exe" = "%Documents and Settings%\%current user%\Application DataMicrosoft\System\Services\18.exe"

  5. Restore the original content of the HOSTS file (%System%\drivers\etc\hosts):
    127.0.0.1 localhost
  6. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
  7. Reboot the computer.

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.