Trojan.Dropper.SSK_7f1931ba70 – Adaware

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.
IRCBot	A bot can communicate with command and control servers via IRC channel.

Process activity

The Trojan creates the following process(es):

wkisvr.exe:552
%original file name%.exe:1264

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

wkisvr.exe:444

File activity

The process %original file name%.exe:1264 makes changes in the file system.

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

%WinDir%\wkisvr.exe (41 bytes)

Registry activity

The process wkisvr.exe:444 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "EC 80 69 50 17 95 A9 E7 69 01 91 CC 01 7E 67 36"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache2"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CacheLimit" = "65452"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CacheLimit" = "65452"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Directory" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path4]
"CacheLimit" = "65452"
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache4"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache3"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Paths" = "4"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CacheLimit" = "65452"

The process %original file name%.exe:1264 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D0 97 93 C5 B1 32 E1 B2 E2 73 59 01 B3 DC CA 93"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache2"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CacheLimit" = "65452"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CacheLimit" = "65452"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Directory" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path4]
"CacheLimit" = "65452"
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache4"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache3"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Paths" = "4"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CacheLimit" = "65452"

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\Run]
"Msn" = "C:\Windows\wkisvr.exe"

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 Trojan'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):
wkisvr.exe:552
%original file name%.exe:1264
Delete the original Trojan file.
Delete or disinfect the following files created/modified by the Trojan:
%WinDir%\wkisvr.exe (41 bytes)
Delete the following value(s) in the autorun key (How to Work with System Registry):
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"Msn" = "C:\Windows\wkisvr.exe"
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: Project1
Product Version: 1.00
Legal Copyright:
Legal Trademarks:
Original Filename: Project1.exe
Internal Name: Project1
File Version: 1.00
File Description:
Comments:
Language: English (United States)

Company Name: Product Name: Project1Product Version: 1.00Legal Copyright: Legal Trademarks: Original Filename: Project1.exeInternal Name: Project1File Version: 1.00File Description: Comments: Language: English (United States)

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	4284	4608	3.85912	3a301263060cfaaa444943f30889f781
.rdata	12288	588	1024	2.08826	1664a906080244b688be142f827fcc8c
.data	16384	636	512	3.98584	877f567186682d86a8e97fd90976868f
.rsrc	20480	34508	34816	5.52828	feba0bc5f41fce9f3be31805b6f5500d

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

Strings from Dumps

wkisvr.exe_444:

.text

`.rdata

@.data

.rsrc

FVSSh

SSSh8

PSShmV@

[DDoS]: Send error: <%d>.

ddos.random

wonk.ack

ddos.ack

wonk.syn

ddos.syn

%s Done with flood (%iKB/sec).

%s Flooding %s:%s with %s for %s seconds

%s Bad URL or DNS Error, error: <%d>

%s Update failed: Error executing file: %s.

%s Process Finished: "%s", Total Running Time: %s.

%s Created process: "%s", PID: <%d>

%s Failed to create process: "%s", error: <%d>

%s Couldn't parse path, error: <%d>

%s File download: %.1fKB to: %s @ %.1fKB/sec.

A%s Couldn't open file for writing: %s.

[UDP] Finished sending packets to %s

[UDP] Error sending udp packets to %s.

%s Failed to get requested URL from HTTP server.

%s URL visited.

%s Failed to connect to HTTP server.

%s Could not open a connection.

%s Invalid URL.

\autorun.inf

icon=%SystemRoot%\system32\SHELL32.dll,4

autorunme.exe

[.ShellClassInfo]

CLSID={645FF040-5081-101B-9F08-00AA002F954E}

\Desktop.ini

Infected drive: %s

ddos.supersyn

ddos.udp

msn.spread

msn.msg

msn.stats

msn.addcontact

[UDP] Failed to start flood thread, error: <%d>

[UDP] Sending %d packets to: %s. Packet size: %d, Delay: %d(ms)

[DDoS]: Failed to start flood thread, error: <%d>.

%s Flooding %s:%s for %s seconds

%s Downloading update from: %s to: %s.

%seraseme_%d%d%d%d%d.exe

%s Downloading URL: %s to: %s.

%s address %s added to msn.

%s Thread Activated: Sending Message.

%s Thread Activated: Sending Zipfile.

%s Thread Activated: Sending Zipfile and Message.

%s Visiting Website Now

MSN MSG

%s Failed to parse command.

USER %s * 0 :%s

NICK %s

PASS %s

QUIT %s

PRIVMSG %s :%s

JOIN %s

JOIN %s %s

MODE %s %s %s

MODE %s %s

Ping Timeout? (%d-%d)%d/%d

PONG %s

NICK

PRIVMSG

JOIN

icmp.dll

shlwapi.dll

ShellExecuteA

shell32.dll

Mozilla/4.0 (compatible)

InternetCrackUrlA

InternetOpenUrlA

FtpPutFileA

FtpGetFileA

HttpSendRequestA

HttpOpenRequestA

wininet.dll

ws2_32.dll

user32.dll

kernel32.dll

%s!%s@%s

%s No %s thread found.

%s %s thread stopped. (%d thread(s) stopped.)

SOFTWARE\Microsoft\Windows\CurrentVersion\Run\

%s\%s

del "%s">nul

if exist "%s" goto Repeat

ping 0.0.0.0>nul

%s\removeMe%i%i%i%i.bat

RegCloseKey

RegCreateKeyExA

ADVAPI32.dll

SHELL32.dll

WS2_32.dll

MSVCR71.dll

_acmdln

_amsg_exit

VkKeyScanA

keybd_event

USER32.dll

ole32.dll

OLEAUT32.dll

GetWindowsDirectoryA

KERNEL32.dll

%s Welcome Bitch.

%s Fail.

%s %s out.

%s <%i> out.

%s No user at: <%i>

%s Invalid slot: <%i>

%s Kill: <%d> threads

%s No threads

%s Killed thread: <%s>

%s %s already running: <%d>.

%s Fail start %s, err: <%d>.

[msn]: Message & Zipfile sent to: %d contacts.

[msn]: Message sent to: %d Contacts.

[msn]: Sent Stats - Messages: %d :: Files: %d :: Message & Files: %d.

Go fuck yourself %s.

%s logged in.

Removed by: %s!%s@%s

%s main thread

%s mis param.

uNkbot - uNkn0wn.eu

C:\Windows\

wkisvr.exe

*@admin.com

dances.instalprivileges.com

wkisvr.exe_444_rwx_00400000_0004E000: