Backdoor.Win32.Caphaw_QKKBAL_9cc3b8d746 – Adaware

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

%original file name%.exe:464
%original file name%.exe:1720
ehzyu.exe:1560
ehzyu.exe:544

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

Explorer.EXE:128

File activity

The process %original file name%.exe:464 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\tmpa53e4c54.bat (177 bytes)
%Documents and Settings%\%current user%\Application Data\Peecen\ehzyu.exe (9606 bytes)

Registry activity

The process %original file name%.exe:464 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "33 F8 DA 2F F0 3B C2 3A 49 0B 51 B1 50 E1 1B AB"

[HKCU\Software\Microsoft\Myav]
"Gywuasi" = "96 C7 6F DF A0 78 41 43 2D C1 55 71 C9 70 C9 85"

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

The process %original file name%.exe:1720 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 28 77 97 3E 12 4E 8E 56 53 DD 2F D0 16 7D 29"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

The process ehzyu.exe:1560 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "AA 64 A3 8E 90 6F DA 22 60 16 84 00 1A 1C EE 07"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Myav]
"Gywuasi" = "96 C7 6F DF A0 78 41 43 2D C1 55 71 C9 70 C9 85"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

The process ehzyu.exe:544 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "AA 35 4A 7A C0 E2 4E 67 84 13 4D 7E 33 B6 80 46"

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

Dropped PE files

MD5	File path
c0a3593ec6d028aec3939f69338f47c4	c:\Documents and Settings\"%CurrentUserName%"\Application Data\Peecen\ehzyu.exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

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

HttpSendRequestExA
HttpSendRequestW
InternetReadFileExA
InternetQueryDataAvailable
HttpSendRequestExW
InternetReadFile
HttpQueryInfoA
HttpSendRequestA
InternetCloseHandle

The Backdoor installs the following user-mode hooks in CRYPT32.dll:

PFXImportCertStore

The Backdoor installs the following user-mode hooks in USER32.dll:

SetCursorPos
DefMDIChildProcA
DefFrameProcA
DefDlgProcA
GetClipboardData
DefMDIChildProcW
DefFrameProcW
GetUpdateRgn
RegisterClassA
GetDCEx
ReleaseCapture
SetCapture
DefWindowProcA
CallWindowProcA
GetUpdateRect
PeekMessageA
CallWindowProcW
GetMessagePos
GetCursorPos
EndPaint
BeginPaint
DefWindowProcW
RegisterClassExA
GetMessageA
DefDlgProcW
SwitchDesktop
OpenInputDesktop
RegisterClassExW
RegisterClassW
GetCapture
PeekMessageW
GetMessageW
GetWindowDC
TranslateMessage
GetDC
ReleaseDC

The Backdoor installs the following user-mode hooks in WS2_32.dll:

WSASend
send
closesocket

The Backdoor installs the following user-mode hooks in kernel32.dll:

GetFileAttributesExW

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

LdrLoadDll
NtCreateThread

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):
%original file name%.exe:464
%original file name%.exe:1720
ehzyu.exe:1560
ehzyu.exe:544
Delete the original Backdoor file.
Delete or disinfect the following files created/modified by the Backdoor:
%Documents and Settings%\%current user%\Local Settings\Temp\tmpa53e4c54.bat (177 bytes)
%Documents and Settings%\%current user%\Application Data\Peecen\ehzyu.exe (9606 bytes)
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: I81MA82IO78X
Product Name: J90ZW84UC90E
Product Version: 1,0,0,0
Legal Copyright: V68RN81JF89L
Legal Trademarks:
Original Filename: O83ZN66DR86F
Internal Name:
File Version: R88FI78AY77M
File Description: W81RK75MS73S
Comments:
Language: Language Neutral

Company Name: I81MA82IO78XProduct Name: J90ZW84UC90EProduct Version: 1,0,0,0Legal Copyright: V68RN81JF89LLegal Trademarks: Original Filename: O83ZN66DR86FInternal Name: File Version: R88FI78AY77MFile Description: W81RK75MS73SComments: Language: Language Neutral

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	525852	526336	4.63347	61ffce4768976fa0dd2a8f6a97b1417a
.rdata	532480	57280	57344	3.32693	0354bc5f2376b5e9a4a3ba38b682dff1
.data	589824	108376	26624	1.49032	8033f5a38941b4685bc2299e78f31221
.rsrc	700416	46732	47104	3.64509	3f9b11a0e169a4a8635c29bc1bdadbf2

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

URL	IP
hxxp://231cool.com/salein/admin/ppptp.jpg	192.154.110.242

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

GET /salein/admin/ppptp.jpg HTTP/1.1

Accept: */*

Connection: Close

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)

Host: 231cool.com

Cache-Control: no-cache

HTTP/1.1 200 OK

Date: Thu, 10 Apr 2014 05:17:39 GMT

Server: Apache/2.2.25 (Unix) mod_ssl/2.2.25 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4

Last-Modified: Tue, 01 Apr 2014 21:47:58 GMT

ETag: "58818b-1c608-4f6021f0a9f80"

Accept-Ranges: bytes

Content-Length: 116232

Connection: close

Content-Type: image/jpeg

.H.x.....!'....V.l...... ...L-..Q.T...KT...NX.J.....T>;..5.x`....D'V.?h....W.......`..H7b.c]......_..peo........l1z..14u.......gw...*.B...2.U.y|*.%.H......\.......,.,P.....Fg.i........o^R6.....Y."].*.:....J...Y......7...f...j.p.-.7...c_y.....p.".].t.C-...uZ.j... ..P.E..M..\.......W.Er.5.!....7.j.bo#1......': ..p.^..4.....q.!....r..lt..]gj9s.....>.y.i.}.'....4..<....O../...........L..\.|.[."h.j..h#l@....4..V69..D.y.E...z........W....\....g`....8..1'5.G..(....Zf.Y........y..........&o^.M[U.....,r.mQT.}...wY.p..X.w......G...`..7.GO..l......o...X....} .W...L#"g._|.o...qB..oNS.$...Q....a..".3fPy...{......$..|_.M.r.%..6..Do.FQ../.D.ZONUo51.V......w.B.......n..(.......K..*8....f........y...8...;..g....|.%L.q..?;.. 4.5l.h..U]..&....."|...9..#..b.<..5.1..M...|..5...Q..v.....D.........U..lK.[.........}-.[.....%~.....;...W.n...m.?..<.d...l..O...z.......P.BN@.=..c.A|.......i.WAt.........n8^..7,....>.....,7.....0..T|y............0._.......e/...^@....\....s.Ob.[wA..Ur.."..\....E2.9.u.,.fXy..<.......%....]:......RF..&..b?@f.5...i2m[2bk..4<......;..:....a.0...q...2....4..H....9h..n..q...>..;........M...q`.`..k.hM..pE.....g.h.1W./...o...Ied6 8!Z...g.v..i.......n'...x...T1P....V~...~P..7.$X.].S......a...)..*..kW.$.n....id..m7...O.*...[!B..:...7L..e.]!...M.xS5g.2.Q...>T..?..._%...~.4.........C.1.=....xtGb...5.C*.ZQS5l..>.=I.!..pQ.gao....bq....{Ga1..>8...kp..3'.4.B.2.H...).[...sY...i..........:.......OE.k..j?U...?l...c%4`ZU~UGz#V,.....J..)&...B..KktE..l=E...t...G;..l....../.r.].!.......7U.....4.

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Map

Strings from Dumps

Explorer.EXE_128_rwx_01880000_00027000:

.text

`.data

.reloc

PR_OpenTCPSocket

http://www.google.com/webhp

gdiplus.dll

GdiplusShutdown

ole32.dll

gdi32.dll

<;.8("9`%,/

,127!' ./9

5/ -?9/#$

./.-#**:

6 !26!1'1

7"52),,>

, >(3=2;

<7!="?):

&;1"&1!7!1

;1 "?&! ?

c,%udcvpdxv ~iydjGBT\YGmTRL[ZMI_

7.>.3; `

1:,0/2$7

?$6 39 ~

HTTP/1.1

http://

https://

HTTP/1.

userenv.dll

del "%s"

if exist "%s" goto d

del /F "%s"

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1)

urlmon.dll

cabinet.dll

SSShlD

GetProcessHeap

KERNEL32.dll

ExitWindowsEx

OpenWindowStationW

GetProcessWindowStation

CreateWindowStationW

CloseWindowStation

SetProcessWindowStation

GetKeyboardState

MapVirtualKeyW

SetKeyboardState

MsgWaitForMultipleObjects

USER32.dll

RegOpenKeyExW

RegEnumKeyExW

RegCloseKey

RegCreateKeyExW

ADVAPI32.dll

PathIsURLW

UrlUnescapeA

SHDeleteKeyW

SHLWAPI.dll

ShellExecuteW

SHELL32.dll

Secur32.dll

SetViewportOrgEx

GDI32.dll

WS2_32.dll

PFXImportCertStore

CertDeleteCertificateFromStore

CertOpenSystemStoreW

CertCloseStore

CertEnumCertificatesInStore

CertDuplicateCertificateContext

PFXExportCertStoreEx

CRYPT32.dll

HttpSendRequestExA

HttpQueryInfoA

HttpSendRequestExW

HttpSendRequestW

HttpSendRequestA

GetUrlCacheEntryInfoW

HttpAddRequestHeadersW

HttpAddRequestHeadersA

InternetCrackUrlA

HttpOpenRequestA

WININET.dll

OLEAUT32.dll

NETAPI32.dll

G'%d#a

>">->3>?>

5S5C5N5Z5

nspr4.dll

cGlobal\XXX

SysShadow

e.dat

kernel32.dll

"%s" %s

/c "%s"

%sx.%s

%sx

%Documents and Settings%\%current user%\Application Data\Orra\xuzao.xua

%Documents and Settings%\%current user%\Application Data\Orra

xuzao.xua

Global\{09A9BAE5-9F8D-3BBC-1572-5B360B7E8651}

%Documents and Settings%\%current user%\Application Data

{9FD208C0-2DA8-ADC7-1572-5B360B7E8651}

Summary

Dynamic Analysis

Removals

Static Analysis

Network Activity

Map

Strings from Dumps