MD5: addec6da6f94dae9f0bf25c61cdaad3a
SHA1: c2b7e15bbc7be90ef5a52fbd613d116263fd7e56
SHA256: 30405b0d3e4c9384727f6ff3aefa2256195c4adee3f64fdaa7f693a01cef682d
SSDeep: 3072:jkpQSccsWlXCFLcVygI7JVLJ3Jh9ypXDCXfUfCwhnVo2bLeZ:jkprDC3FppJipg4k
Size: 170903 bytes
File type: EXE
Platform: WIN32
Entropy: Not Packed
PEID: UPolyXv05_v6
Company: DefenderPro Inc.
Created at: 2004-09-12 12:55:29
Analyzed on: Windows7 SP1 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):

ntvdm.exe:1796

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

%original file name%.exe:1908

Mutexes

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

File activity

The process %original file name%.exe:1908 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):

C:\Windows\System32\USR_Shohdi_Photo_USR.rsu (21682 bytes)
C:\Users\"%CurrentUserName%"\AppData\Local\Adobe\Reader 9.3\Setup Files\Reader9\Setup.exe (444160 bytes)
C:\Users\"%CurrentUserName%"\AppData\Local\Adobe\Reader 9.3\Setup Files\Setup.exe (408872 bytes)
C:\addec6da6f94dae9f0bf25c61cdaad3a.usr (59861 bytes)
C:\Windows\USR_Shohdi_Photo_USR.exe (6889123 bytes)

The Backdoor deletes the following file(s):

C:\Users\"%CurrentUserName%"\AppData\Local\Adobe\Reader 9.3\Setup Files\Reader9\Setup.usr (0 bytes)
C:\Windows\System32\USR_Shohdi_Photo_USR.rsu (0 bytes)
C:\Users\"%CurrentUserName%"\AppData\Local\Adobe\Reader 9.3\Setup Files\Setup.usr (0 bytes)

The process ntvdm.exe:1796 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):

C:\Users\"%CurrentUserName%"\AppData\Local\Temp\scs7C8F.tmp (269 bytes)
C:\Users\"%CurrentUserName%"\AppData\Local\Temp\scs7C7F.tmp (335 bytes)

The Backdoor deletes the following file(s):

C:\Users\"%CurrentUserName%"\AppData\Local\Temp\scs7C8F.tmp (0 bytes)
C:\Users\"%CurrentUserName%"\AppData\Local\Temp\scs7C7F.tmp (0 bytes)

Registry activity

Dropped PE files

HOSTS file anomalies

The Backdoor modifies "%System%\drivers\etc\hosts" file which is used to translate DNS entries to IP addresses.
The modified file is 864 bytes in size. The following strings are added to the hosts file listed below:

Rootkit activity

The Backdoor installs the following user-mode hooks in ntdll.dll:

NtQueryInformationProcess
ZwOpenFile
NtDeviceIoControlFile
ZwCreateUserProcess
ZwCreateProcessEx
NtCreateProcess
ZwCreateFile

Propagation

VersionInfo

No information is available.

PE Sections

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Total found: 2
ba2a35409ea953a9c3634a25af7c50e5
acb25cc073acadfa8ff558dde1ca3669

URLs

URL	IP
sys.zief.pl	148.81.111.121
teredo.ipv6.microsoft.com

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

ET TROJAN Reply Sinkhole - irc-sinkhole.cert.pl

Traffic

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

`.rsrc

D$(PSSh

ccRegVfy.exe

ccApp.exe

IEXPLORE.EXE

windows

\*.exe

.text

.data

.rsrc

msvcrt.dll

KERNEL32.dll

nddeapir.pdb

_acmdln

m.Zw%

ADVAPI32.DLL

\USERINIT.EXE

%s:*:enabled:@shell32.dll,-1

SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer

Qoysys.zief.pl

core.ircgalaxy.pl

NICK avabcadz

SFC.DLL

SFC_OS.DLL

USER32.DLL

SHLWAPI.DLL

WSOCK32.DLL

WININET.DLL

%.6x . . :%c%.8x%x %s

JOIN

127.0.0.1 jL.chura.pl

#<iframe src="hXXp://jL.chura.pl/rc/" style="width:1px;height:1px"></iframe>

KERNEL32.DLL

windowsupdate

drweb

user32.dll

kernel32.dll

MSVCIRT.dll

MSVCRT.dll

5.1.2600.0 (xpclient.010817-1148)

NDDEAPIR.EXE

Windows

Operating System

5.1.2600.0

%original file name%.exe_1908_rwx_00401000_00002000:

D$(PSSh

%original file name%.exe_1908_rwx_00419000_00005000:

ADVAPI32.DLL

\USERINIT.EXE

%s:*:enabled:@shell32.dll,-1

SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer

Qoysys.zief.pl

core.ircgalaxy.pl

NICK avabcadz

SFC.DLL

SFC_OS.DLL

USER32.DLL

SHLWAPI.DLL

WSOCK32.DLL

WININET.DLL

%.6x . . :%c%.8x%x %s

JOIN

127.0.0.1 jL.chura.pl

#<iframe src="hXXp://jL.chura.pl/rc/" style="width:1px;height:1px"></iframe>

KERNEL32.DLL

windowsupdate

drweb

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. Scan a system with an anti-rootkit tool.
   
2. Terminate malicious process(es) (How to End a Process With the Task Manager):
   

   ntvdm.exe:1796

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

   C:\Windows\System32\USR_Shohdi_Photo_USR.rsu (21682 bytes)
   C:\Users\"%CurrentUserName%"\AppData\Local\Adobe\Reader 9.3\Setup Files\Reader9\Setup.exe (444160 bytes)
   C:\Users\"%CurrentUserName%"\AppData\Local\Adobe\Reader 9.3\Setup Files\Setup.exe (408872 bytes)
   C:\addec6da6f94dae9f0bf25c61cdaad3a.usr (59861 bytes)
   C:\Windows\USR_Shohdi_Photo_USR.exe (6889123 bytes)
   C:\Users\"%CurrentUserName%"\AppData\Local\Temp\scs7C8F.tmp (269 bytes)
   C:\Users\"%CurrentUserName%"\AppData\Local\Temp\scs7C7F.tmp (335 bytes)

5. Restore the original content of the HOSTS file (%System%\drivers\etc\hosts):
   127.0.0.1 localhost
   
6. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
   
7. Reboot the computer.
   

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