ThreatExpert Report: Backdoor.Win32.Iroffer.jl, Backdoor.Win32.Iroffer

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Submission Summary:

Submission details:

Submission received: 24 September 2012, 14:58:30
Processing time: 8 min 5 sec
Submitted sample:

File MD5: 0xE5CCA7DD7A03C2B188A391360A13537B
File SHA-1: 0xEB4C1BA3311B650F6027CAB085F3F993668A0953
Filesize: 3,639,473 bytes
Alias:

Backdoor.Win32.Iroffer.jl [Kaspersky Lab]
Backdoor.Win32.Iroffer [Ikarus]

Technical Details:

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Possible Security Risk

Attention! The following threat category was identified:

Threat Category	Description
	A malicious backdoor trojan that runs in the background and allows remote access to the compromised system

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	[file and pathname of the sample #1]	3,639,473 bytes	MD5: 0xE5CCA7DD7A03C2B188A391360A13537B SHA-1: 0xEB4C1BA3311B650F6027CAB085F3F993668A0953	Backdoor.Win32.Iroffer.jl [Kaspersky Lab] Backdoor.Win32.Iroffer [Ikarus]
2	%Windir%\Temp\40000060000cfa9800032\csrss.exe	20,096 bytes	MD5: 0x60324595A9584A75A3E5A1C33A041E3B SHA-1: 0x148768505C9ABB6E14982D4C098C21351AF5FB82	(not available)

Note:

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

The following directory was created:

%Windir%\Temp\40000060000cfa9800032

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
csrss.exe	%Windir%\TEMP\40000060000cfa9800032\csrss.exe	401,408 bytes
iotar.exe	%Windir%\softwaredistribution\setup\data\addons\iotar\iotar.exe	163,840 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	114,688 bytes
systems.exe	%Windir%\softwaredistribution\setup\root\systems.exe	57,344 bytes
csrss.exe	%Windir%\softwaredistribution\setup\root\csrss.exe	401,408 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\Program Options
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_TASK-MANAGER
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_TASK-MANAGER\0000
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_TASK-MANAGER\0000\Control
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Task-Manager
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Task-Manager\Security
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Task-Manager\Enum
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_TASK-MANAGER
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_TASK-MANAGER\0000
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_TASK-MANAGER\0000\Control
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Task-Manager
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Task-Manager\Security
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Task-Manager\Enum
HKEY_USERS\.DEFAULT\Software\Cygnus Solutions
HKEY_USERS\.DEFAULT\Software\Cygnus Solutions\Cygwin
HKEY_USERS\.DEFAULT\Software\Cygnus Solutions\Cygwin\mounts v2
HKEY_USERS\.DEFAULT\Software\Cygnus Solutions\Cygwin\Program Options
HKEY_CURRENT_USER\Software\Cygnus Solutions
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\Program Options
HKEY_CURRENT_USER\Software\WinRAR SFX

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_TASK-MANAGER\0000\Control]

*NewlyCreated* = 0x00000000
ActiveService = "Task-Manager"

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_TASK-MANAGER\0000]

Service = "Task-Manager"
Legacy = 0x00000001
ConfigFlags = 0x00000000
Class = "LegacyDriver"
ClassGUID = "{8ECC055D-047F-11D1-A537-0000F8753ED1}"
DeviceDesc = "Task-Manager"

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_TASK-MANAGER]

NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Task-Manager\Enum]

0 = "Root\LEGACY_TASK-MANAGER\0000"
Count = 0x00000001
NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Task-Manager\Security]

Security = 01 00 14 80 90 00 00 00 9C 00 00 00 14 00 00 00 30 00 00 00 02 00 1C 00 01 00 00 00 02 80 14 00 FF 01 0F 00 01 01 00 00 00 00 00 01 00 00 00 00 02 00 60 00 04 00 00 00 00 00 14 00 FD 01 02 00 01 01 00 00 00 00 00 05 12 00 00 00 00 00 18 00 FF 01 0F 0

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Task-Manager]

Type = 0x00000110
Start = 0x00000002
ErrorControl = 0x00000001
ImagePath = "%Windir%\SoftwareDistribution\Setup\Root\Systems.exe"
DisplayName = "Task-Manager"
ObjectName = "LocalSystem"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_TASK-MANAGER\0000\Control]

*NewlyCreated* = 0x00000000
ActiveService = "Task-Manager"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_TASK-MANAGER\0000]

Service = "Task-Manager"
Legacy = 0x00000001
ConfigFlags = 0x00000000
Class = "LegacyDriver"
ClassGUID = "{8ECC055D-047F-11D1-A537-0000F8753ED1}"
DeviceDesc = "Task-Manager"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_TASK-MANAGER]

NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Task-Manager\Enum]

0 = "Root\LEGACY_TASK-MANAGER\0000"
Count = 0x00000001
NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Task-Manager\Security]

Security = 01 00 14 80 90 00 00 00 9C 00 00 00 14 00 00 00 30 00 00 00 02 00 1C 00 01 00 00 00 02 80 14 00 FF 01 0F 00 01 01 00 00 00 00 00 01 00 00 00 00 02 00 60 00 04 00 00 00 00 00 14 00 FD 01 02 00 01 01 00 00 00 00 00 05 12 00 00 00 00 00 18 00 FF 01 0F 0

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Task-Manager]

Type = 0x00000110
Start = 0x00000002
ErrorControl = 0x00000001
ImagePath = "%Windir%\SoftwareDistribution\Setup\Root\Systems.exe"
DisplayName = "Task-Manager"
ObjectName = "LocalSystem"

[HKEY_CURRENT_USER\Software\WinRAR SFX]

C%%WINDOWS%txp = "C:\WINDOWS/txp"

The following Registry Values were modified:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\ServiceCurrent]

(Default) =

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ServiceCurrent]

(Default) =

Other details

Analysis of the file resources indicate the following possible country of origin:

Russian Federation

To mark the presence in the system, the following Mutex object was created:

_SHuassist.mtx

The following Host Names were requested from a host database:

envy.podzone.net
0.0.0.0

There was registered attempt to establish connection with the remote host. The connection details are:

Remote Host	Port Number
0.0.0.0	1034

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