BRENASA.EXE is Backdoor Azbreg

August 7, 2012 by NightWatcher
Filed under: Backdoor 
: Solved!

Fix it immediately:

The program BRENASA.EXE is used for hidden penetration into PC and its remote administration.
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Malware Analysis of BRENASA.EXE
Full path on a computer: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-14699\brenasa.exe

Detected by RegRun Warrior:

Item Name: taskman
Author: Unknown
Related File: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-1830\ZABERG.EXE
Type: Winlogon System

Item Name: Cxzqzs
Author: Unknown
Related File: %APPDATA%\CXZQZS.EXE
Type: Registry Run

Item Name: newcontr8nd7
Author: Unknown
Related File: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12387\NEWCONT8RND7.EXE
Type: Registry Run

Item Name: zaber0
Author: Unknown
Related File: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-1830\ZABERG.EXE
Type: Registry Run

Item Name: shell
Author: Unknown
Related File: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12341\newcont4rnd3.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-1830\zaberg.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12352\newcont5rnd4.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12356\newcont6rnd5.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12367\newcont7rnd6.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12387\newcont8rnd7.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12389\newcont9rnd8.exe,explorer.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-14699\brenasa.exe
Type: User Shell

Item Name: MSSMARTMON
Author: Unknown
Related File: %APPDATA%\9.TMP
Type: Registry Run

Item Name: tbrena
Author:
Related File: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-14699\BRENASA.EXE
Type: Registry Run

Item Name: newcontr7nd6
Author: Unknown
Related File: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12367\NEWCONT7RND6.EXE
Type: Registry Run

Item Name: newcontr6nd5
Author: Unknown
Related File: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12356\NEWCONT6RND5.EXE
Type: Registry Run

Item Name: newcontr5nd4
Author: Unknown
Related File: C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12352\NEWCONT5RND4.EXE
Type: Registry Run

Removal Results: Success
Number of reboot: 1

BRENASA.EXE is known as:

Backdoor.Azbreg, Trojan.Ransom.Gimemo

BRENASA.EXE hash:

  • MD5: e71b799c73de369ddfb48b175c0a0ebd
The file tries to download information from some web sites.
How to quickly detect BRENASA.EXE presence?

Registry:
  • HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Taskman: “C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12387\newcont8rnd7.exe”
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Cxzqzs: “%AppData%\Cxzqzs.exe”
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run\MSSMARTMON: “”%AppData%\4.tmp”"
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run\tbrena: “C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-14699\brenasa.exe”
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run\newcontr9nd8: “C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12389\newcont9rnd8.exe”
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run\newcontr8nd7: “C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12387\newcont8rnd7.exe”
  • HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell: “C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12387\newcont8rnd7.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12389\newcont9rnd8.exe,explorer.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-14699\brenasa.exe”
Folders:
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12367
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12387
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12389
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-14699
Files:
  • %AppData%\1.tmp
  • %AppData%\2.tmp
  • %AppData%\3.tmp
  • %AppData%\4.tmp
  • %AppData%\5.tmp
  • %AppData%\6.tmp
  • %AppData%\7.tmp
  • %AppData%\8.tmp
  • %AppData%\Cxzqzs.exe
  • %Temp%\75018.tmp
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12367\Desktop.ini
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12367\newcont7rnd6.exe
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12387\Desktop.ini
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12387\newcont8rnd7.exe
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12389\Desktop.ini
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-12389\newcont9rnd8.exe
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-14699\brenasa.exe
  • C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-14699\Desktop.ini


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Premium software: RegRun Security Suite (Good choice for removal and protection)

Written by

Malware Hunter.

Tags: Azbreg, Backdoor, BRENASA.EXE

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