Backdoor.Generic.755288_a9538af39f – Adaware

Dynamic Analysis

Payload

Behaviour	Description
WormAutorun	A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Backdoor's file once a user opens a drive's folder in Windows Explorer.

Process activity

The Backdoor creates the following process(es):

%original file name%.exe:2716
FB_B2.tmp.exe:852
FB_B3.tmp.exe:2876

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

MicrosoftUpdate:2056

Mutexes

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

File activity

The process FB_B2.tmp.exe:852 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\FB_B3.tmp.exe (61 bytes)

The process FB_B3.tmp.exe:2876 makes changes in the file system.

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

%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe (61 bytes)

The process MicrosoftUpdate:2056 makes changes in the file system.

The Backdoor deletes the following file(s):

%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe (0 bytes)

Registry activity

The process %original file name%.exe:2716 makes changes in the system registry.

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

[HKLM\System\CurrentControlSet\Control\Session Manager]
"PendingFileRenameOperations" = "\??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\, , \??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\,"

The process FB_B2.tmp.exe:852 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CA F5 6B BB 2D 3B 6F D7 49 86 11 96 3E DF A7 17"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f3-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"AutoDetect" = "1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Documents"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Desktop" = "%Documents and Settings%\%current user%\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{773a730e-74fb-11e2-b597-000c293bdf2f}]
"BaseClass" = "Drive"

[HKLM\System\CurrentControlSet\Control\Session Manager]
"PendingFileRenameOperations" = "\??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\, , \??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\, , \??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\,"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f2-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp]
"FB_B3.tmp.exe" = "FB_B3.tmp"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f5-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Desktop" = "%Documents and Settings%\All Users\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"
"Personal" = "%Documents and Settings%\%current user%\My Documents"

The Backdoor modifies IE settings for security zones to map all web-nodes that bypassing the proxy to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"ProxyBypass" = "1"

The Backdoor modifies IE settings for security zones to map all urls to the Intranet Zone:

"IntranetName" = "1"

The Backdoor modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

"UNCAsIntranet" = "1"

The process FB_B3.tmp.exe:2876 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A4 A5 2D 7A 57 9B B4 C6 10 1F 0B 2F D8 89 4B BC"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Application Data\Microsoft]
"MicrosoftUpdate.exe" = "MicrosoftUpdate"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f3-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"AutoDetect" = "1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Documents"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Desktop" = "%Documents and Settings%\%current user%\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{773a730e-74fb-11e2-b597-000c293bdf2f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f2-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f5-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Desktop" = "%Documents and Settings%\All Users\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"
"Personal" = "%Documents and Settings%\%current user%\My Documents"

The Backdoor modifies IE settings for security zones to map all web-nodes that bypassing the proxy to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"ProxyBypass" = "1"

The Backdoor modifies IE settings for security zones to map all urls to the Intranet Zone:

"IntranetName" = "1"

The Backdoor modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

"UNCAsIntranet" = "1"

The process MicrosoftUpdate:2056 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "F4 FB BC 7A FD E1 C8 3D 46 50 4C C8 D0 27 23 7B"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

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]
"MicrosoftUpdate.exe" = "%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe"

Dropped PE files

MD5	File path
2678a5b18392956aad1da388059abf4d	c:\Documents and Settings\"%CurrentUserName%"\Application Data\Microsoft\MicrosoftUpdate.exe
18b070da891ed263be4eadf9a8e1a30c	c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Temp\FB_B2.tmp.exe
2678a5b18392956aad1da388059abf4d	c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Temp\FB_B3.tmp.exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Backdoor's file once a user opens a drive's folder in Windows Explorer.

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:2716
FB_B2.tmp.exe:852
FB_B3.tmp.exe:2876
Delete the original Backdoor file.
Delete or disinfect the following files created/modified by the Backdoor:
%Documents and Settings%\%current user%\Local Settings\Temp\FB_B3.tmp.exe (61 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe (61 bytes)
Delete the following value(s) in the autorun key (How to Work with System Registry):
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"MicrosoftUpdate.exe" = "%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe"
Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
Reboot the computer.

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

Static Analysis

VersionInfo

Company Name:
Product Name:
Product Version: 1, 0, 0, 1
Legal Copyright: Copyright ? 2012
Legal Trademarks:
Original Filename:
Internal Name:
File Version: 1, 0, 0, 1
File Description:
Comments:
Language: Language Neutral

Company Name: Product Name: Product Version: 1, 0, 0, 1Legal Copyright: Copyright ? 2012Legal Trademarks: Original Filename: Internal Name: File Version: 1, 0, 0, 1File Description: Comments: Language: Language Neutral

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
UPX0	4096	40960	0	0	d41d8cd98f00b204e9800998ecf8427e
UPX1	45056	86016	86016	5.37941	b2c11470cba39cd030fb70b86d24102d
.rsrc	131072	4096	1536	1.95072	4ad48a0a788f93f8c69aa59c83d0501d

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Map

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

Strings from Dumps

MicrosoftUpdate.exe_2056:

`.rsrc

8W.kB

kernel32.dll

$*@@@*$@@@$ *@@* $@@($*)@-$*@@$-*@@$*-@@(*$)@-*$@@*-$@@*$-@@-* $@-$ *@* $-@$ *-@$ -*@*- $@($ *)(* $)

oleaut32.dll

EVariantBadIndexError

u%CNu

TSocketPort

TUdpSocket

TUdpSocketd

LocalPort4

RemotePort0

%d.%d.%d.%d

0.0.0.0

PSAPI.dll

Windows

Urlmon.dll

SOFTWARE\Microsoft\Windows\CurrentVersion\Run

SOFTWARE\Microsoft\Windows\CurrentVersion\Run\

:\autorun.inf

icon=%SystemRoot%\system32\SHELL32.dll,4

\Mozilla Firefox\

nss3.dll

mozcrt19.dll

sqlite3.dll

nspr4.dll

plc4.dll

plds4.dll

nssutil3.dll

softokn3.dll

PK11_GetInternalKeySlot

userenv.dll

\Mozilla\Firefox\

profiles.ini

\signons3.txt

MSGBOX

Firefox

windows

Windows|

WebDL

URLDownloadToFileA

StUDP|

KWindows

UrlMon

GetCPInfo

RegOpenKeyExA

RegFlushKey

RegCreateKeyExA

RegCloseKey

ShellExecuteA

MsgWaitForMultipleObjects

EnumWindows

GetKeyboardType

.idata

.rdata

P.reloc

P.rsrc

.OusFd

BSS.dKv

KERNEL32.DLL

advapi32.dll

shell32.dll

SHFolder.dll

user32.dll

version.dll

wsock32.dll

%s.Seek not implemented$Operation not allowed on sorted list

Property %s does not exist

Thread creation error: %s

Thread Error: %s (%d)

%List does not allow duplicates ($0%x)#A component named %s already exists%String list does not allow duplicates

Cannot create file "%s". %s

Cannot open file "%s". %s$''%s'' is not a valid component name

Invalid property value List capacity out of bounds (%d)

List count out of bounds (%d)

List index out of bounds (%d) Out of memory while expanding memory stream

Error reading %s%s%s: %s

Failed to set data for '%s'

Ancestor for '%s' not found

Cannot assign a %s to a %sECheckSynchronize called from thread $%x, which is NOT the main thread

Class %s not found

%s (%s, line %d)

Abstract Error?Access violation at address %p in module '%s'. %s of address %p

System Error. Code: %d.

Invalid variant operation%Invalid variant operation (%s%.8x)

%s5Could not convert variant of type (%s) into type (%s)=Overflow while converting variant of type (%s) into type (%s)

Operation not supported

External exception %x

Interface not supported

Invalid pointer operation

Invalid class typecast0Access violation at address %p. %s of address %p

Privileged instruction(Exception %s in module %s at %p.

Application Error1Format '%s' invalid or incompatible with argument

No argument for format '%s'"Variant method calls not supported

!'%s' is not a valid integer value

I/O error %d

Integer overflow Invalid floating point operation

MicrosoftUpdate.exe_2056_rwx_11491000_0002A000:

kernel32.dll

$*@@@*$@@@$ *@@* $@@($*)@-$*@@$-*@@$*-@@(*$)@-*$@@*-$@@*$-@@-* $@-$ *@* $-@$ *-@$ -*@*- $@($ *)(* $)

oleaut32.dll

EVariantBadIndexError

u%CNu

TSocketPort

TUdpSocket

TUdpSocketd

LocalPort4

RemotePort0

%d.%d.%d.%d

0.0.0.0

PSAPI.dll

Windows

Urlmon.dll

SOFTWARE\Microsoft\Windows\CurrentVersion\Run

SOFTWARE\Microsoft\Windows\CurrentVersion\Run\

:\autorun.inf

icon=%SystemRoot%\system32\SHELL32.dll,4

\Mozilla Firefox\

nss3.dll

mozcrt19.dll

sqlite3.dll

nspr4.dll

plc4.dll

plds4.dll

nssutil3.dll

softokn3.dll

PK11_GetInternalKeySlot

userenv.dll

\Mozilla\Firefox\

profiles.ini

\signons3.txt

MSGBOX

Firefox

windows

Windows|

WebDL

URLDownloadToFileA

StUDP|

KWindows

UrlMon

GetCPInfo

RegOpenKeyExA

RegFlushKey

RegCreateKeyExA

RegCloseKey

ShellExecuteA

MsgWaitForMultipleObjects

EnumWindows

GetKeyboardType

.idata

.rdata

P.reloc

P.rsrc

%s.Seek not implemented$Operation not allowed on sorted list

Property %s does not exist

Thread creation error: %s

Thread Error: %s (%d)

%List does not allow duplicates ($0%x)#A component named %s already exists%String list does not allow duplicates

Cannot create file "%s". %s

Cannot open file "%s". %s$''%s'' is not a valid component name

Invalid property value List capacity out of bounds (%d)

List count out of bounds (%d)

List index out of bounds (%d) Out of memory while expanding memory stream

Error reading %s%s%s: %s

Failed to set data for '%s'

Ancestor for '%s' not found

Cannot assign a %s to a %sECheckSynchronize called from thread $%x, which is NOT the main thread

Class %s not found

%s (%s, line %d)

Abstract Error?Access violation at address %p in module '%s'. %s of address %p

System Error. Code: %d.

Invalid variant operation%Invalid variant operation (%s%.8x)

%s5Could not convert variant of type (%s) into type (%s)=Overflow while converting variant of type (%s) into type (%s)

Operation not supported

External exception %x

Interface not supported

Invalid pointer operation

Invalid class typecast0Access violation at address %p. %s of address %p

Privileged instruction(Exception %s in module %s at %p.

Application Error1Format '%s' invalid or incompatible with argument

No argument for format '%s'"Variant method calls not supported

!'%s' is not a valid integer value

I/O error %d

Integer overflow Invalid floating point operation

Summary

Dynamic Analysis

Removals

Static Analysis

Network Activity

Map

Strings from Dumps