Gen.Variant.Kazy.224568_a5a03819bb – Adaware

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.

Summary

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.

Dynamic Analysis

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

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):
%original file name%.exe:2712
regedit.exe:3060
Delete the original Backdoor file.
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)
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"
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

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)

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: 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:

Network Activity

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><head>.<title>404 Not Found</title>.</head><body>.<h1>Not Found</h1>.<p>The requested URL /wjacu.php was not found on this server.</p>.<hr>.<address>Apache/2.2.15 (CentOS) Server at VVV.gov.toh.info Port 80</address>.</body></html>...

Map

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

Strings from Dumps

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: