Backdoor.Win32.Farfli_9c5e180e28

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:928
%original file name%.exe:1924

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

svchost.exe:632
iexplore.exe:524

Mutexes

The following mutexes were created/opened:No objects were found.

File activity

The process %original file name%.exe:928 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 (1425 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)

The process %original file name%.exe:1924 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:928 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "C9 B8 2E E4 9F A2 0C E9 93 92 63 D0 04 27 83 37"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Program Files%\Internet Explorer]
"iexplore.exe" = "Internet Explorer"

[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:

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

[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:1924 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D5 C3 22 58 62 D3 34 E8 2C 97 DC 79 CA CE 6A 90"

[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

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:928
   %original file name%.exe:1924
   

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 (1425 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)

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

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

5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
   
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.

Static Analysis

VersionInfo

Company Name:
Product Name:
Product Version: 0.0.0.0
Legal Copyright:
Legal Trademarks:
Original Filename: aoecoqky.exe
Internal Name: aoecoqky.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: aoecoqky.exeInternal Name: aoecoqky.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	241076	241152	4.39876	9665a8c60bb1ff09ff190c204a747955
.rsrc	253952	4096	4096	0.473678	bb2536bec23f7c15473b0100a2a18b7c
.reloc	262144	12	512	0.070639	9719eec4a6d0ac3e49ce2364356cdb48
fKqUVpYF	270336	51368	51712	5.32227	b4a39ea186c2076d440c69380ce39783

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
hxxp://www.google.com/	173.194.113.211
hxxp://www.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA	173.194.113.207
taherbadboy73.ddns.net	41.107.70.89
ssl.gstatic.com	216.58.214.227
clients1.google.com.ua	216.58.209.195

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

GET / HTTP/1.1

Accept: */*

Accept-Language: en-us

Accept-Encoding: gzip, deflate

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)

Host: VVV.google.com

Connection: Keep-Alive

HTTP/1.1 302 Found

Cache-Control: private

Content-Type: text/html; charset=UTF-8

Location: hXXp://VVV.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA

Content-Length: 259

Date: Sun, 01 May 2016 19:49:40 GMT

<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">.<TITLE>302 Moved</TITLE></HEAD><BODY>.<H1>302 Moved</H1>.The document has moved.<A HREF="hXXp://VVV.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA">here</A>...</BODY></HTML>..HTTP/1.1 302 Found..Cache-Control: private..Content-Type: text/html; charset=UTF-8..Location: hXXp://VVV.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA..Content-Length: 259..Date: Sun, 01 May 2016 19:49:40 GMT..<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">.<TITLE>302 Moved</TITLE></HEAD><BODY>.<H1>302 Moved</H1>.The document has moved.<A HREF="hXXp://VVV.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA">here</A>...</BODY></HTML>....

GET /?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA HTTP/1.1

Accept: */*

Accept-Language: en-us

Accept-Encoding: gzip, deflate

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)

Host: VVV.google.com.ua

Connection: Keep-Alive

HTTP/1.1 302 Found

Location: hXXps://VVV.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA&gws_rd=ssl

Cache-Control: private

Content-Type: text/html; charset=UTF-8

P3P: CP="This is not a P3P policy! See hXXps://VVV.google.com/support/accounts/answer/151657?hl=en for more info."

Date: Sun, 01 May 2016 19:49:40 GMT

Server: gws

Content-Length: 275

X-XSS-Protection: 1; mode=block

X-Frame-Options: SAMEORIGIN

Set-Cookie: NID=79=dzqB4nOjEGG6zCUQRV0LlU43wMjPfStSWqNzfIXfvw05pmVpkLGxeegmsn76RyIpDTQMcgPQwl_gJxSJDKvvmttYbYUOEMkUSGenk4f_6GHJf9bQ_TX2A2BNxSewAzEZ; expires=Mon, 31-Oct-2016 19:49:40 GMT; path=/; domain=.google.com.ua; HttpOnly

<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">.<TITLE>302 Moved</TITLE></HEAD><BODY>.<H1>302 Moved</H1>.The document has moved.<A HREF="hXXps://VVV.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA&gws_rd=ssl">here</A>...</BODY></HTML>..HTTP/1.1 302 Found..Location: hXXps://VVV.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA&gws_rd=ssl..Cache-Control: private..Content-Type: text/html; charset=UTF-8..P3P: CP="This is not a P3P policy! See https://VVV.google.com/support/accounts/answer/151657?hl=en for more info."..Date: Sun, 01 May 2016 19:49:40 GMT..Server: gws..Content-Length: 275..X-XSS-Protection: 1; mode=block..X-Frame-Options: SAMEORIGIN..Set-Cookie: NID=79=dzqB4nOjEGG6zCUQRV0LlU43wMjPfStSWqNzfIXfvw05pmVpkLGxeegmsn76RyIpDTQMcgPQwl_gJxSJDKvvmttYbYUOEMkUSGenk4f_6GHJf9bQ_TX2A2BNxSewAzEZ; expires=Mon, 31-Oct-2016 19:49:40 GMT; path=/; domain=.google.com.ua; HttpOnly..<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">.<TITLE>302 Moved</TITLE></HEAD><BODY>.<H1>302 Moved</H1>.The document has moved.<A HREF="hXXps://VVV.google.com.ua/?gfe_rd=cr&ei=1F0mV7WRCoPJYM_zhVA&gws_rd=ssl">here</A>...</BODY></HTML>....

<<< skipped >>>

Map

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

Strings from Dumps

iexplore.exe_956:

%?9-*09,*19}*09

%?9-*09,*19}*09

.text

.text

`.data

`.data

.rsrc

.rsrc

msvcrt.dll

msvcrt.dll

KERNEL32.dll

KERNEL32.dll

NTDLL.DLL

NTDLL.DLL

USER32.dll

USER32.dll

SHLWAPI.dll

SHLWAPI.dll

SHDOCVW.dll

SHDOCVW.dll

Software\Microsoft\Windows\CurrentVersion\Explorer\BrowseNewProcess

Software\Microsoft\Windows\CurrentVersion\Explorer\BrowseNewProcess

IE-X-X

IE-X-X

rsabase.dll

rsabase.dll

System\CurrentControlSet\Control\Windows

System\CurrentControlSet\Control\Windows

dw15 -x -s %u

dw15 -x -s %u

watson.microsoft.com

watson.microsoft.com

IEWatsonURL

IEWatsonURL

%s -h %u

%s -h %u

iedw.exe

iedw.exe

Iexplore.XPExceptionFilter

Iexplore.XPExceptionFilter

jscript.DLL

jscript.DLL

mshtml.dll

mshtml.dll

mlang.dll

mlang.dll

urlmon.dll

urlmon.dll

wininet.dll

wininet.dll

shdocvw.DLL

shdocvw.DLL

browseui.DLL

browseui.DLL

comctl32.DLL

comctl32.DLL

IEXPLORE.EXE

IEXPLORE.EXE

iexplore.pdb

iexplore.pdb

ADVAPI32.dll

ADVAPI32.dll

MsgWaitForMultipleObjects

MsgWaitForMultipleObjects

IExplorer.EXE

IExplorer.EXE

IIIIIB(II<.fg>

IIIIIB(II<.fg>

7?_____ZZSSH%

7?_____ZZSSH%

)z.UUUUUUUU

)z.UUUUUUUU

,....Qym

,....Qym

````2```

````2```

{.QLQIIIKGKGKGKGKGKG

{.QLQIIIKGKGKGKGKGKG

;33;33;0

;33;33;0

8888880

8888880

8887080

8887080

browseui.dll

browseui.dll

shdocvw.dll

shdocvw.dll

6.00.2900.5512 (xpsp.080413-2105)

6.00.2900.5512 (xpsp.080413-2105)

Windows

Windows

Operating System

Operating System

6.00.2900.5512

6.00.2900.5512

svchost.exe_632:

.text

.text

`.data

`.data

.rsrc

.rsrc

ADVAPI32.dll

ADVAPI32.dll

KERNEL32.dll

KERNEL32.dll

NTDLL.DLL

NTDLL.DLL

RPCRT4.dll

RPCRT4.dll

NETAPI32.dll

NETAPI32.dll

ole32.dll

ole32.dll

ntdll.dll

ntdll.dll

RegCloseKey

RegCloseKey

RegOpenKeyExW

RegOpenKeyExW

GetProcessHeap

GetProcessHeap

NtOpenKey

NtOpenKey

svchost.pdb

svchost.pdb

\PIPE\

\PIPE\

Software\Microsoft\Windows NT\CurrentVersion\Svchost

Software\Microsoft\Windows NT\CurrentVersion\Svchost

\Registry\Machine\System\CurrentControlSet\Control\SecurePipeServers\

\Registry\Machine\System\CurrentControlSet\Control\SecurePipeServers\

5.1.2600.5512 (xpsp.080413-2111)

5.1.2600.5512 (xpsp.080413-2111)

svchost.exe

svchost.exe

Windows

Windows

Operating System

Operating System

5.1.2600.5512

5.1.2600.5512

svchost.exe_632_rwx_10000000_0004D000:

`.rsrc

`.rsrc

ServerKeyloggerU

ServerKeyloggerU