Trojan.Microfake.D_72ce30645b – Adaware

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Trojan creates the following process(es):

regsvr32.exe:2180
hrl1498.tmp:1796

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

fsflsu.exe:3388

Mutexes

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

File activity

The process regsvr32.exe:2180 makes changes in the file system.

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

C:\Users\"%CurrentUserName%"\AppData\Local\Temp\hrl1498.tmp (261 bytes)

The process hrl1498.tmp:1796 makes changes in the file system.

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

C:\Windows\System32\fsflsu.exe (601 bytes)

The process fsflsu.exe:3388 makes changes in the file system.

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

C:\RCX1C84.tmp (17084 bytes)
C:\Windows\System32\hra33.dll (7 bytes)
C:\Windows\Sys (139 bytes)
C:\Boot\lpk.dll (673 bytes)

Registry activity

The process hrl1498.tmp:1796 makes changes in the system registry.

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

[HKLM\System\CurrentControlSet\Services\Distribuoyo]
"Description" = "Distribuajk Transaction Coordinator Service."

[HKLM\System\CurrentControlSet\Control\Session Manager]
"PendingFileRenameOperations" = "\??\C:\Users\"%CurrentUserName%"\AppData\Local\Temp\SOFTWARE.LOG,"

Dropped PE files

MD5	File path
50b2e1131e61706f7f1c84a8c2f88f9f	c:\Users\"%CurrentUserName%"\AppData\Local\Temp\SOFTWARE.LOG
50b2e1131e61706f7f1c84a8c2f88f9f	c:\Windows\System32\fsflsu.exe

HOSTS file anomalies

The Trojan 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:

127.0.0.1	www.Brenz.pl
127.0.0.1	validation.sls.microsoft.com

Rootkit activity

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

NtQueryInformationProcess
ZwOpenFile
NtDeviceIoControlFile
ZwCreateUserProcess
ZwCreateProcessEx
NtCreateProcess
ZwCreateFile

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*

Scan a system with an anti-rootkit tool.
Terminate malicious process(es) (How to End a Process With the Task Manager):
regsvr32.exe:2180
hrl1498.tmp:1796
Delete the original Trojan file.
Delete or disinfect the following files created/modified by the Trojan:
C:\Users\"%CurrentUserName%"\AppData\Local\Temp\hrl1498.tmp (261 bytes)
C:\Windows\System32\fsflsu.exe (601 bytes)
C:\RCX1C84.tmp (17084 bytes)
C:\Windows\System32\hra33.dll (7 bytes)
C:\Boot\lpk.dll (673 bytes)
Restore the original content of the HOSTS file (%System%\drivers\etc\hosts): 127.0.0.1 localhost
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

No information is available.

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	2860	3072	3.84485	c9b6b9fbded3d4764666702b145428d1
.rdata	8192	2505	2560	3.36056	6951ee1a0ff3a7f5a44727b4713506a3
.data	12288	672	0	0	d41d8cd98f00b204e9800998ecf8427e
.rsrc	16384	130196	130560	5.04951	f7f1019f9cba20d347086022584f640d
.reloc	147456	494	512	3.52939	cfa8d04dd000bb30ab126902176ed40d

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
ilo.brenz.pl	148.81.111.121
fei9988.3322.org	221.130.179.36

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

wje..........q......^...#bZ.:..<.......#..-v..x.Z9S.V.bz.A.s.].9..c.

:irc 001 nuwrexuk :Hi virtu.:irc 376 nuwrexuk :End of /MOTD command.:irc 001 nuwrexuk :Hi virtu.:irc 376 nuwrexuk :End of /MOTD command..:nuwrexuk JOIN #.0..:nuwrexuk JOIN #.0.

Map

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

Strings from Dumps

regsvr32.exe_2180:

.text

`.data

.rsrc

@.reloc

ADVAPI32.dll

KERNEL32.dll

USER32.dll

msvcrt.dll

ole32.dll

ntdll.dll

COMCTL32.dll

regsvr32.pdb

RegCloseKey

RegOpenKeyExW

_wcmdln

_amsg_exit

version="5.1.0.0"

name="Microsoft.Windows.RegSvr32"

name="Microsoft.Windows.Common-Controls"

version="6.0.0.0"

publicKeyToken="6595b64144ccf1df"

\regsvr32.exe

user32.dll

Excessive # of DLL's on cmdline

6.1.7600.16385 (win7_rtm.090713-1255)

REGSVR32.EXE

Windows

Operating System

6.1.7600.16385

fsflsu.exe_3388:

.text

.rdata

@.data

.rsrc

.ld50l

.lyA/l

USER32.dll

ADVAPI32.dll

SHELL32.dll

WS2_32.dll

WINMM.dll

GET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htmGET ^&&%$%$^%$#^&**(*((&*^%$##$%^&*(*&^%$%^&*.htm

RegCloseKey

RegOpenKeyExA

RegOpenKeyA

ShellExecuteA

MFC42.DLL

MSVCRT.dll

_acmdln

WinExec

KERNEL32.dll

fei9988.3322.org:8080

564528578564528578

%u.%u.%u.%u

hra%u.dll

iexplore.exe

stf%c%c%c%c%c.exe

PlusCtrl.dll

kernel32.dll

SOFTWARE.LOG

%c%c%c%c%c%c.exe

%u MB

%u MHz

Windows NT

Windows 7

Windows 2008

Windows Vista

Windows 2003

Windows XP

Windows 2000

SOFTWARE\Microsoft\Windows NT\CurrentVersion

\Program Files\Internet Explorer\iexplore.exe

#0%s!

%s/%s

GET %s HTTP/1.1

Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*

User-Agent:Mozilla/4.0 (compatible; MSIE %d.0; Windows NT %d.1; SV1)

Host: %s:%d

Host: %s

User-Agent:Mozilla/5.0 (X11; U; Linux i686; en-US; re:1.4.0) Gecko/20080808 Firefox/%d.0

Referer: hXXp://%s:80/hXXp://%s

%s %s%s

User-Agent:Mozilla/4.0 (compatible; MSIE %d.00; Windows NT %d.0; MyIE 3.01)

User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)

%d.%d.%d.%d

192.168.1.244

`.rdata

@.reloc

SHLWAPI.dll

lpk.dll

9(Cj%s

FX !>%D

ADVAPI32.DLL

JOIN #.%d

DSTAMP %ddd

\USERINIT.EXE

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

SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer

ilo.brenz.pl

ant.trenz.pl

NICK fqwsyamo

SFC.DLL

SFC_OS.DLL

USER32.DLL

SHLWAPI.DLL

WSOCK32.DLL

WININET.DLL

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

KERNEL32.DLL

windowsupdate

drweb

NICK xscwxrus

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

JOIN

127.0.0.1 VVV.Brenz.pl

#

cmd /c RD /s /q "%s"

"%s" a -r -ep1"%s" "%s" "%s\lpk.dll"

"%s" x "%s" *.exe "%s\"

cmd /c %s vb "%s" lpk.dll|find /i "lpk.dll"

rar.exe

1, 0, 0, 1

server.EXE

fsflsu.exe_3388_rwx_0040C000_00008000:

9(Cj%s

FX !>%D

1, 0, 0, 1

server.EXE

fsflsu.exe_3388_rwx_00415000_00007000:

ADVAPI32.DLL

JOIN #.%d

DSTAMP %ddd

\USERINIT.EXE

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

SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer

ilo.brenz.pl

ant.trenz.pl

NICK fqwsyamo

SFC.DLL

SFC_OS.DLL

USER32.DLL

SHLWAPI.DLL

WSOCK32.DLL

WININET.DLL

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

KERNEL32.DLL

windowsupdate

drweb

fsflsu.exe_3388_rwx_0041D000_00007000:

ADVAPI32.DLL

DSTAMP %ddd

\USERINIT.EXE

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

SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer

ilo.brenz.pl

ant.trenz.pl

NICK xscwxrus

SFC.DLL

SFC_OS.DLL

USER32.DLL

SHLWAPI.DLL

WSOCK32.DLL

WININET.DLL

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

JOIN

127.0.0.1 VVV.Brenz.pl

#

KERNEL32.DLL

windowsupdate

drweb

Summary

Dynamic Analysis

Removals

Static Analysis

Network Activity

Map

Strings from Dumps