Gen.Trojan.Heur.KS.2_02ab7e3941 – Adaware

HEUR:Hoax.Win32.ExpProc.gen (Kaspersky), Gen:Trojan.Heur.KS.2 (B) (Emsisoft), Gen:Trojan.Heur.KS.2 (AdAware), Fake-AV.Win32.FakeRean.2.FD, FakeAVWin32FakeRean.YR (Lavasoft MAS)Behaviour: Trojan, Fake-AV

The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.

Summary

MD5: 02ab7e3941fe204394c64cb93233c680

SHA1: ecf29e0bb7cac31fe38463f32cb8493d4e500779

SHA256: b7b75d29177f6371d408b62d9c4a99bedf192e649c8dc636a5c5e9d5886bc72f

SSDeep: 6144:YwIMcs0wA0q QhUOHu9dXJ83fWNBGsgHpAe3m6VZ5D:Ywn7nuuzZ83aCJA nD

Size: 335872 bytes

File type: DLL

Platform: WIN32

Entropy: Packed

PEID: MicrosoftVisualCv71EXE, UPolyXv05_v6

Company: AirInstaller

Created at: 2008-04-14 19:09:34

Analyzed on: WindowsXP ESX SP3 32-bit

Summary: Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Trojan creates the following process(es):

regsvr32.exe:1696

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

wun.exe:1100

Mutexes

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

File activity

The process regsvr32.exe:1696 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Application Data\wun.exe (1616 bytes)

The process wun.exe:1100 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Application Data\w7wk868rbh6 (197 bytes)
%Documents and Settings%\%current user%\Templates\w7wk868rbh6 (197 bytes)
%Documents and Settings%\All Users\Application Data\w7wk868rbh6 (197 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\w7wk868rbh6 (197 bytes)

The Trojan deletes the following file(s):

C:\02ab7e3941fe204394c64cb93233c680.dll (0 bytes)

Registry activity

The process regsvr32.exe:1696 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "3F BE 0A C3 98 E4 C8 9C 0B 91 2E CC D9 E2 9B 5C"

[HKLM\SOFTWARE\Microsoft\Security Center]
"AntiVirusOverride" = "1"

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

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"DoNotAllowExceptions" = "0"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile]
"DisableNotifications" = "1"

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

[HKLM\SOFTWARE\Microsoft\Security Center]
"FirewallDisableNotify" = "1"
"UpdatesDisableNotify" = "1"
"FirewallOverride" = "1"

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile]
"EnableFirewall" = "0"

"DoNotAllowExceptions" = "0"

Antivirus notifications are disabled:

[HKLM\SOFTWARE\Microsoft\Security Center]
"AntiVirusDisableNotify" = "1"

A firewall is disabled:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"EnableFirewall" = "0"

The following service is disabled:

[HKLM\System\CurrentControlSet\Services\SharedAccess]
"Start" = "4"

Firewall notifications are disabled:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"DisableNotifications" = "1"

The process wun.exe:1100 makes changes in the system registry.

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

[HKCU\Software\Classes\exefile\shell\open\command]
"(Default)" = "%Documents and Settings%\%current user%\Local Settings\Application Data\wun.exe -a %1 %*"

[HKCU\Software\Classes\exefile\shell\runas\command]
"IsolatedCommand" = "%1 %*"

[HKCU\Software\Classes\exefile]
"(Default)" = "Application"

[HKCU\Software\Classes\.exe\shell\runas\command]
"IsolatedCommand" = "%1 %*"

[HKLM\SOFTWARE\Clients\StartMenuInternet]
"(Default)" = "IEXPLORE.EXE"

[HKCU\Software\Classes\exefile\shell\open\command]
"IsolatedCommand" = "%1 %*"

[HKCU\Software\Classes\.exe\shell\runas\command]
"(Default)" = "%1 %*"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

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

[HKCU\Software\Classes\exefile\shell\runas\command]
"(Default)" = "%1 %*"

[HKCU\Software\Classes\exefile]
"Content Type" = "application/x-msdownload"

[HKCU\Software\Classes\.exe\shell\open\command]
"IsolatedCommand" = "%1 %*"

[HKCU\Software\Classes\.exe]
"(Default)" = "exefile"

[HKLM\SOFTWARE\Clients\StartMenuInternet\IEXPLORE.EXE\shell\open\command]
"(Default)" = "%Documents and Settings%\%current user%\Local Settings\Application Data\wun.exe -a %Program Files%\Internet Explorer\iexplore.exe"

[HKCU\Software\Classes\exefile\DefaultIcon]
"(Default)" = "%1"

[HKCU\Software\Microsoft\Windows]
"Identity" = "1878903825"

[HKCU\Software\Classes\.exe\shell\open\command]
"(Default)" = "%Documents and Settings%\%current user%\Local Settings\Application Data\wun.exe -a %1 %*"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "89 F7 86 B1 BC DE DF 70 67 F6 68 8C ED BF 6C 17"

[HKCU\Software\Classes\.exe\DefaultIcon]
"(Default)" = "%1"

[HKCU\Software\Classes\.exe]
"Content Type" = "application/x-msdownload"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"ctfmon.exe" = "%System%\ctfmon.exe"

Dropped PE files

MD5	File path
58df36e3f8c6a8eb8046c1259f1e543c	c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Application Data\wun.exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

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):
regsvr32.exe:1696
Delete the original Trojan file.
Delete or disinfect the following files created/modified by the Trojan:
%Documents and Settings%\%current user%\Local Settings\Application Data\wun.exe (1616 bytes)
%Documents and Settings%\%current user%\Local Settings\Application Data\w7wk868rbh6 (197 bytes)
%Documents and Settings%\%current user%\Templates\w7wk868rbh6 (197 bytes)
%Documents and Settings%\All Users\Application Data\w7wk868rbh6 (197 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\w7wk868rbh6 (197 bytes)
Delete the following value(s) in the autorun key (How to Work with System Registry):
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"ctfmon.exe" = "%System%\ctfmon.exe"
Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
Reboot the computer.

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.

Static Analysis

VersionInfo

No information is available.

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	241664	241664	5.3951	07ed87c145b7052e20bd9e84ea70533c
.rdata	245760	49152	49152	4.53869	39c822a940abbb3ea4bfe7f6601fbc91
.data	294912	1736704	20480	4.01107	6bb8a19cc0457bbddc9ee63565a698f0
.idata	2031616	8192	8192	2.75531	b8ab8d1305469ac2e06848ee16698db9
.rsrc	2039808	12288	12288	3.74062	da16a27d056b00f7aeb9b614cc896607

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
microsoft.com	134.170.185.46

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Map

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

Strings from Dumps

wun.exe_1100_rwx_00401000_001EF000:

2010:06:04 04:17:53

hXXp://ns.adobe.com/xap/1.0/

2010-06-04T04:17:53.229

John

2010-06-04T04:17:53.229

John

,!.fy

3d%D-

/X.Rp

_U$%x

(7),01444

'9=82<.342>

2010:06:04 04:07:41

2010-06-04T04:07:41.468

John

2010-06-04T04:07:41.468

John

.IDATx

2010:06:04 04:18:38

2010-06-04T04:18:38.428

John

2010-06-04T04:18:38.428

John

HTTP/1.0 200 OK

Date: %s

Expires: %s

Content-Type: %s

2010:06:04 04:19:08

2010-06-04T04:19:08.340

John

2010-06-04T04:19:08.340

John

]sM-H%x

P%Sp

{]m%X-de

2010:06:04 04:19:40

2010-06-04T04:19:40.162

John

2010-06-04T04:19:40.162

John

$%.wH

B.fAk

00000000

2010:06:04 04:20:15

2010-06-04T04:20:15.844

John

2010-06-04T04:20:15.844

John

9%D,3

gdiplus.dll

user32.dll

wsock32.dll

ws2_32.dll

oleaut32.dll

gdi32.dll

advapi32.dll

uxtheme.dll

ole32.dll

shell32.dll

comctl32.dll

shlwapi.dll

version.dll

msimg32.dll

ntdll.dll

kernel32.dll

microsoft.com

Software\Microsoft\Windows

hXXp://

SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

IEXPLORE.EXE

FIREFOX.EXE

%System%\ctfmon.exe

ctfmon.exe

Software\Microsoft\Windows\CurrentVersion\Run

%s\shell\%s\command

%s, %.2i %s %.4i %.2i:%.2i:%.2i GMT

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)

HTTP/1.0

HTTP/1.

PSSh;

PSSh_

SSSSSSh

SSSSh

%WinDir%\$hf_mig$\KB975713\

h1 { color: #4465A2; font-size: 1.1em; font-weight: normal; vertical-align:bottom; margin-top: 7px; margin-bottom: 4px; }h2 { font-size: 0.9em; font-weight: normal; margin-top: 20px; margin-bottom: 1px; }h3 { font-size: 0.9em; font-weight: normal; margin-top: 10px; margin-bottom: 1px; }h4 { font-size: 0.9em; font-weight: normal; margin-top: 12px; margin-bottom: 1px; }.b { vertical-align: middle; margin-top: %MF%px; margin-right: 6px; }ul, ol { font-size: 0.9em; list-style-position: outside; margin-top: 1px; margin-bottom: 1px; padding-top: 1px; padding-bottom: 1px; line-height: 1.3em; }

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