Backdoor.Win32.Farfli_9c1f962f88 – Adaware

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.

Summary

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.

Dynamic Analysis

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.

Removals

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 malicious process(es) (How to End a Process With the Task Manager):
%original file name%.exe:1272
%original file name%.exe:440
Delete the original Backdoor file.
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)
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"
Restore the original content of the HOSTS file (%System%\drivers\etc\hosts): 127.0.0.1 localhost
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.

Static Analysis

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

Company Name: Product Name: Product Version: 0.0.0.0Legal Copyright: Legal Trademarks: Original Filename: 0be1i0ey.exeInternal Name: 0be1i0ey.exeFile Version: 0.0.0.0File 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:

Network Activity

URLs

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Map

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

Strings from Dumps

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