Gen.Variant.Razy.15441_dee4cfafca – Adaware

Trojan.Win32.Inject.bbyo (Kaspersky), Gen:Variant.Razy.15441 (B) (Emsisoft), Gen:Variant.Razy.15441 (AdAware), Backdoor.Win32.Simbot.FD, BackdoorSimbot.YR (Lavasoft MAS)Behaviour: Trojan, Backdoor

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

Summary

MD5: dee4cfafca168eb9b065b1269ccb8b6a

SHA1: 579523329b2e9e894c5388e640362081b8424bf5

SHA256: 0810468469773425bc1bb239951dcbb9286db5b354bc6d877f3b65f9b0f86995

SSDeep: 384:JszLGoc1H8sQjiu2D0qrcEr3d7dBpymO89dY8bqQybPp1mHZ:Jsz7c1H8sd1DX7p79dY8bqQI3k

Size: 27648 bytes

File type: EXE

Platform: WIN32

Entropy: Not Packed

PEID: UPolyXv05_v6

Company: no certificate found

Created at: 2011-01-20 02:38:21

Analyzed on: WindowsXP 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):

regedit.exe:664
%original file name%.exe:1152

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

svchost.exe:912

Mutexes

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

File activity

The process %original file name%.exe:1152 makes changes in the file system.

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

%Documents and Settings%\%current user%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-1844237615-1960408961-1801674531-1003\c5b88721db08c824db69d0bbc702beb8_75ed9567-aa58-4c8e-a8ea-3cad7c47ab03 (44 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\4$@2.dat (48 bytes)
C:\%original file name%.exe.tmp1 (1780 bytes)

Registry activity

The process regedit.exe:664 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "88 36 29 CD AB BE 36 20 11 89 9B 13 AA E2 2F 5C"

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]
"clr_optimization_v4.0.30319_32" = "%Documents and Settings%\%current user%\Local Settings\clr_optimization_v4.0.30319_32.exe"

The process %original file name%.exe:1152 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "73 77 B1 BA 83 33 57 7E FB 41 25 25 C1 A2 CA A1"

Dropped PE files

MD5	File path
164ff6b90393e5f250cdb84f71b4d456	c:\Documents and Settings\"%CurrentUserName%"\Local Settings\clr_optimization_v4.0.30319_32.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):
regedit.exe:664
%original file name%.exe:1152
Delete the original Trojan file.
Delete or disinfect the following files created/modified by the Trojan:
%Documents and Settings%\%current user%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-1844237615-1960408961-1801674531-1003\c5b88721db08c824db69d0bbc702beb8_75ed9567-aa58-4c8e-a8ea-3cad7c47ab03 (44 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\4$@2.dat (48 bytes)
C:\%original file name%.exe.tmp1 (1780 bytes)
Delete the following value(s) in the autorun key (How to Work with System Registry):
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"clr_optimization_v4.0.30319_32" = "%Documents and Settings%\%current user%\Local Settings\clr_optimization_v4.0.30319_32.exe"
Reboot the computer.

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

Static Analysis

VersionInfo

Company Name: Adobe Systems, Inc.
Product Name: Flash? Player Installer/Uninstaller
Product Version: 10,1,53,64
Legal Copyright: Copyright ? 1996-2010 Adobe, Inc.
Legal Trademarks: Adobe? Flash? Player
Original Filename: FlashUtil.exe
Internal Name: Adobe? Flash? Player Installer/Uninstaller 10.1
File Version: 10,1,53,64
File Description: Adobe? Flash? Player Installer/Uninstaller 10.1 r53
Comments:
Language: English (United States)

Company Name: Adobe Systems, Inc.Product Name: Flash? Player Installer/UninstallerProduct Version: 10,1,53,64Legal Copyright: Copyright ? 1996-2010 Adobe, Inc.Legal Trademarks: Adobe? Flash? PlayerOriginal Filename: FlashUtil.exeInternal Name: Adobe? Flash? Player Installer/Uninstaller 10.1File Version: 10,1,53,64File Description: Adobe? Flash? Player Installer/Uninstaller 10.1 r53Comments: Language: English (United States)

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	22760	23040	5.08945	8227a32054989558c5d54e6b5b2efcf6
.rdata	28672	1028	1536	2.44349	42595f358d82ed008b0da3cc81ff353d
.data	32768	931	512	2.48951	f79df4c7bdf90017d9ab69db5221470d
.rsrc	36864	1136	1536	1.84173	b5ed7b029bc65184d8f3a398fb854e6d

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Total found: 19
d7b175c4994714b2b8545dc1991dba02
d73291ba669b49bcb87bf2b37cb935d0
a69e9b12be42752aaba0b18a9ae06483
b80c0ac3e473db260da901206c2fb5c5
2ca798c49939cbaea17868b537109bb0
29ae66a29ee57abaef55627d4c46e620
047211416ceb896c6a78727d12ef3020
ff92c245af33c097ecb3ecec3bffd393
e6d39f539be3330e2a19da1fd796b1dd
e57e42ec25c2f6d40c0dd707acd10a76
02506ce80526e116ce887e57df6592ea
019ce6f574e3bbd9ca4f77ba182cc0b4
14f6158aa696f3521cbee17001e55a41
15e5c0a8f396c5df3b3241c173fd04d0
afa0b769dcaa0630a654b7ceb69aafd0
d99a5fa84fe6aa27e279c2d55433a47d
a6007c60befe053f8521ae15de7c370b
a4e3d511d52771d61d4b67a782f07cfb
ac23bfa013bdfdd3624274c0454dda4a

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

svchost.exe_912:

.text

`.rdata

@.data

SSh@C@

MFC42.DLL

MSVCRT.dll

_acmdln

WinExec

KERNEL32.dll

USER32.dll

ADVAPI32.dll

HttpQueryInfoA

InternetOpenUrlA

HttpSendRequestA

HttpOpenRequestA

WININET.dll

WS2_32.dll

iphlpapi.dll

SHLWAPI.dll

211.234.117.132

intweb.mobwork.net

regedit.exe /s

~dfds3.reg

Windows Registry Editor Version 5.00

"%s"="%s"

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

WinHttp

%s.tmp1

4$@2.dat

hXXp://%s:%d/%s.php?id=d%s&ext=%s

/%s.php?id=d%s&ext=%s

hXXp://%s:%d/%s.php?id=d%s

%c%c%c%c%c

/%s.php?id=d%s

%%temp%%\%u

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)

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

HTTP/1.1

X-X-X-X-X-X

01-01-01-01-01-01

%c%c%c%c%c%c.exe

svchost.exe_912_rwx_00400000_00005000: