Backdoor.Win32.PcClient.FD, WormRebhip.YR, GenericAutorunWorm.YR (Lavasoft MAS)Behaviour: Backdoor, Worm, WormAutorun
The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.
Summary
MD5: 35470c97d9e1a9f1f78020bfe0f9e22e
SHA1: f8f94a74537b11c15eb7f0b0a6b76c43d88ab9ae
SHA256: c464c9a4c9ccf1f9b56641ec9e42a8b56bba182307c7a78d9fdba8602a7f658a
SSDeep: 24576:3ydqEXj0oQSoXj3powEqEtf4anyj2sWFTFRA:/zZSoXtocE2an6QF
Size: 1022976 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: MicrosoftVisualC, NETexecutable, UPolyXv05_v6
Company: no certificate found
Created at: 2014-02-17 00:04:47
Analyzed on: WindowsXP SP3 32-bit
Summary: Backdoor. Malware that enables a remote control of victim's machine.
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:1800
Application DataDEmpEmFyLK.exe:188
Application DataDEmpEmFyLK.exe:1564
avira.exe:496
avira.exe:1040
The Backdoor injects its code into the following process(es):
rundll32.exe:888
File activity
The process %original file name%.exe:1800 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):
%Documents and Settings%\%current user%\Local Settings\Application DataWjsIbMbqct.Jpg (70 bytes)
%Documents and Settings%\%current user%\Local Settings\Application DataDEmpEmFyLK.exe (1830 bytes)
The process Application DataDEmpEmFyLK.exe:1564 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):
%Program Files%\Large\avira.exe (3361 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\X-GRY-X.txt (221 bytes)
Registry activity
The process %original file name%.exe:1800 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8E C4 26 CE 9B 30 15 EC 63 E5 0A 23 97 84 08 97"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{5c14c4f6-74da-11e2-81b0-000c29ec7fc5}]
"BaseClass" = "Drive"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Documents"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Local AppData" = "%Documents and Settings%\%current user%\Local Settings\Application Data"
"Desktop" = "%Documents and Settings%\%current user%\Desktop"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"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\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"
[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%System%]
"shimgvw.dll" = "Windows Picture and Fax Viewer"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Personal" = "%Documents and Settings%\%current user%\My Documents"
[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Local Settings]
"Application DataDEmpEmFyLK.exe" = "÷óÓâ€ÂÃÂŒð頂þãÂÂÂÂ予Ҷ難ẦқÓâ€ÂäḈ与Ҷã‘ã†ûÃÂÅ ÃÂÂÂÃÂȄÂÂÉãÂÂȋ¯üÉ"
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:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"UNCAsIntranet" = "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 web-nodes that bypassing proxy to the Intranet Zone:
"ProxyBypass" = "1"
The process Application DataDEmpEmFyLK.exe:188 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "4A 00 7F EE 4A 77 27 EE EF 75 E8 AB B0 D9 91 33"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"
The process Application DataDEmpEmFyLK.exe:1564 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "0A 4F 13 D4 5E 6F 86 C9 5F EB E0 C0 E4 53 7A 6A"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run]
"Policies" = "%Program Files%\Large\avira.exe"
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run]
"Policies" = "%Program Files%\Large\avira.exe"
[HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\{MB3JKSW-Y883-WE0K-IY6U-SL6N6I178}]
"StubPath" = "%Program Files%\Large\avira.exe Restart"
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]
"HKCM" = "%Program Files%\Large\avira.exe"
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"HKLM" = "%Program Files%\Large\avira.exe"
The process rundll32.exe:888 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "7B EA 5C 48 B4 21 22 CE 15 1D 06 2B 02 01 DE CB"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{5c14c4f6-74da-11e2-81b0-000c29ec7fc5}]
"BaseClass" = "Drive"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"
The process avira.exe:496 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "4A 13 FE DE 20 C8 50 90 4A 07 A4 94 D1 8C 34 EA"
The process avira.exe:1040 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8E FB F6 E8 66 A6 DD 8A 75 F0 60 33 31 2D 66 A7"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"
Network activity (URLs)
No activity has been detected.
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:1800
Application DataDEmpEmFyLK.exe:188
Application DataDEmpEmFyLK.exe:1564
avira.exe:496
avira.exe:1040 - Delete the original Backdoor file.
- Delete or disinfect the following files created/modified by the Backdoor:
%Documents and Settings%\%current user%\Local Settings\Application DataWjsIbMbqct.Jpg (70 bytes)
%Documents and Settings%\%current user%\Local Settings\Application DataDEmpEmFyLK.exe (1830 bytes)
%Program Files%\Large\avira.exe (3361 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\X-GRY-X.txt (221 bytes) - Delete the following value(s) in the autorun key (How to Work with System Registry):
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"HKCM" = "%Program Files%\Large\avira.exe"
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"HKLM" = "%Program Files%\Large\avira.exe" - Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
- Reboot the computer.