Gen.Variant.Kazy.224568_a5a03819bb

by malwarelabrobot on November 17th, 2014 in Malware Descriptions.

Susp_Dropper (Kaspersky), Gen:Variant.Kazy.224722 (B) (Emsisoft), Gen:Variant.Kazy.224568 (AdAware), Backdoor.Win32.Simbot.FD, BackdoorSimbot.YR (Lavasoft MAS)
Behaviour: Backdoor


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

Requires JavaScript enabled!

Summary
Dynamic Analysis
Static Analysis
Network Activity
Map
Strings from Dumps
Removals

MD5: a5a03819bb8ddd78b86a0079117cfc40
SHA1: 9cbbc8b231b62fba603fdcf454333e079891e483
SHA256: e108e49aa0de18ba1b583fa2b56f00287e1efa2a1dc72b60ce75da7d9c2d248f
SSDeep: 384:zIqi/i99pEcfyL01iceZ73hmkx7Lj0bThrSaZYLRap3W0NK9tBk0slmeg:zI9g9PlE7Rv5LUThf2Nk/K9Dslmeg
Size: 20992 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: UPolyXv05_v6
Company: Uyuld & co.
Created at: 2010-11-06 05:06:34
Analyzed on: WindowsXPESX SP3 32-bit


Summary:

Backdoor. Malware that enables a remote control of victim's machine.

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

%original file name%.exe:2712
regedit.exe:3060

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

svchost.exe:2756

Mutexes

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

File activity

The process %original file name%.exe:2712 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):

C:\RCXB2.tmp (23552 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\4$@2.dat (48 bytes)
C:\%original file name%.exe.tmp1 (373 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-796845957-1563985344-1801674531-1003\c5b88721db08c824db69d0bbc702beb8_f3a4e041-90c9-46df-a35a-850a694fae5b (44 bytes)

The Backdoor deletes the following file(s):

C:\%original file name%.exe.tmp1 (0 bytes)

Registry activity

The process %original file name%.exe:2712 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "9D FA 1C 12 E2 C7 64 6E 43 F8 97 70 81 4A CB 04"

The process regedit.exe:3060 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "09 73 26 08 4C 97 ED 8D 14 55 3B C5 32 59 AD CE"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"RemoteAccess" = "%Documents and Settings%\%current user%\Local Settings\RemoteAccess.exe"

Dropped PE files

MD5 File path
7a9bf64fb473908de6f6cff2e8e7853c c:\Documents and Settings\"%CurrentUserName%"\Local Settings\RemoteAccess.exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

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: Spanish (Spain, International Sort)

PE Sections

Name Virtual Address Virtual Size Raw Size Entropy Section MD5
.text 4096 4392 4608 5.22196 218121512f0e8a6f37c8110c6229ac3f
.rdata 12288 1045 1536 2.51569 b09e1f7c28fc22c6f6859d92fabdae15
.data 16384 927 512 2.53957 4bd92ec76dfb579497a8263cd411230a
.rsrc 20480 12996 13312 5.4223 8d9b2c28983ad0a6abee5aaf006db5d9

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

URLs

URL IP
hxxp://www.gov.toh.info/wjacu.php?id=004413111D304CEG3G 211.234.117.178


IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

GET /wjacu.php?id=004413111D304CEG3G HTTP/1.1
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Host: VVV.gov.toh.info
Connection: Keep-Alive
Cache-Control: no-cache


HTTP/1.1 404 Not Found
Date: Sun, 16 Nov 2014 14:45:33 GMT
Server: Apache/2.2.15 (CentOS)
Content-Length: 289
Connection: close
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">.<html>&
lt;head>.<title>404 Not Found</title>.</head><
body>.<h1>Not Found</h1>.<p>The requested URL /wj
acu.php was not found on this server.</p>.<hr>.<address
>Apache/2.2.15 (CentOS) Server at VVV.gov.toh.info Port 80</addr
ess>.</body></html>...

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

svchost.exe_2756:

.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
VVV.gov.toh.info
200.115.173.102
200.115.138.136
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_2756_rwx_00400000_00005000:

.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
VVV.gov.toh.info
200.115.173.102
200.115.138.136
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


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:2712
    regedit.exe:3060

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

    C:\RCXB2.tmp (23552 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\4$@2.dat (48 bytes)
    C:\%original file name%.exe.tmp1 (373 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-796845957-1563985344-1801674531-1003\c5b88721db08c824db69d0bbc702beb8_f3a4e041-90c9-46df-a35a-850a694fae5b (44 bytes)

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

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "RemoteAccess" = "%Documents and Settings%\%current user%\Local Settings\RemoteAccess.exe"

  5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  6. Reboot the computer.

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

No votes yet


Lavasoft is the maker of Ad-Aware, the world's most popular anti-malware software with over 450 million downloads.
© 2025 Lavasoft. All rights reserved.
Terms Of Use |   Privacy Policy


x

Our best antivirus yet!

Fresh new look. Faster scanning. Better protection.

Enjoy unique new features, lightning fast scans and a simple yet beautiful new look in our best antivirus yet!

For a quicker, lighter and more secure experience, download the all new adaware antivirus 12 now!

Download adaware antivirus 12
No thanks, continue to lavasoft.com
close x

Discover the new adaware antivirus 12

Our best antivirus yet

Download Now