Backdoor.Win32.Fynloski_f0b6eecc73

by malwarelabrobot on October 14th, 2013 in Malware Descriptions.

Backdoor.Fynloski.E (BitDefender), Backdoor:Win32/Fynloski.A (Microsoft), HEUR:Trojan.Win32.Generic (Kaspersky), Backdoor.Win32.Fynloski.A (v) (VIPRE), BackDoor.Comet.134 (DrWeb), Backdoor.Fynloski.E (B) (Emsisoft), Generic.gj (McAfee), Suspicious.MH690.A (Symantec), Backdoor.Win32.Fynloski (Ikarus), Backdoor.Fynloski.E (FSecure), Win32/DH{IAMPCTZPFRsteyQiXA} (AVG), Win32:Delf-SQI [Trj] (Avast), TROJ_AGENT_056176.TOMB (TrendMicro), Backdoor.Win32.Fynloski.FD, Trojan.Win32.Iconomon.FD, Trojan.Win32.Sasfis.FD, VirTool.Win32.DelfInject.FD, TrojanDownloaderAndromeda.YR, GenericDownloader.YR, BackdoorFynloski.YR, GenericInjector.YR (Lavasoft MAS)
Behaviour: Trojan-Downloader, Trojan, Backdoor, VirTool


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

Summary
Technical Details
Removal Recommendations

MD5: f0b6eecc73f296ea3c26328d58d67b04
SHA1: dfbc388d3eea46359b6f10a1e4519542c53b168a
SHA256: d92eb98e9abfe4ccff9e9a1f21f8d0f6f4ec56e60ef2f5617e7fb5120be685a1
SSDeep: 6144:IgswhRH1yNHSd02rLt90sA1TIlJ64rYJFGKm 3GSH2ppnVa:IbW2SNX8IXrgFGy3H23nk
Size: 344064 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: PECompactV2X, PECompactv20, UPolyXv05_v6
Company: no certificate found
Created at: 2012-06-03 21:33:20


Summary:

Backdoor. Malware that enables a remote control of victim's machine.

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

attrib.exe:1820
attrib.exe:376
f0b6eecc73f296ea3c26328d58d67b04.exe:676

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

msdcsc.exe:336
notepad.exe:1736

File activity

The process f0b6eecc73f296ea3c26328d58d67b04.exe:676 makes changes in a file system.
The Backdoor creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\My Documents\MSDCSC\msdcsc.exe (2105 bytes)

Registry activity

The process msdcsc.exe:336 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "34 4E 14 12 09 21 59 52 02 22 D5 F6 6F 74 29 9F"

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

[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"

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

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

Antivirus notifications are disabled:

[HKLM\SOFTWARE\Microsoft\Security Center]
"AntiVirusDisableNotify" = "1"

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]
"??????????.b" = "%Documents and Settings%\%current user%\My Documents\MSDCSC\msdcsc.exe"

The process attrib.exe:1820 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "77 B3 AA 63 BD 60 81 0A 5E F3 54 1E 7C BC 3D 58"

The process attrib.exe:376 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D3 01 17 3A 58 7F 81 94 3B 61 63 F4 5E 04 33 7B"

The process notepad.exe:1736 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "93 F1 CA 53 15 67 D2 C8 8D 9F 60 4E 24 CA 7D 27"

The process f0b6eecc73f296ea3c26328d58d67b04.exe:676 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "28 E7 BA 5C 2B 57 D3 44 76 10 68 95 DA 53 2D 0F"

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

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

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

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

[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%\My Documents\MSDCSC]
"msdcsc.exe" = "Remote Service Application"

The Backdoor modifies IE settings for security zones to map all web-nodes that bypassing proxy to the Intranet Zone:

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

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]
"??????????.b" = "%Documents and Settings%\%current user%\My Documents\MSDCSC\msdcsc.exe"

The Backdoor modifies IE settings for security zones to map all urls to the Intranet Zone:

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

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 adds the reference to itself to be executed when a user logs on:

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
"UserInit" = "%System%\userinit.exe,%Documents and Settings%\%current user%\My Documents\MSDCSC\msdcsc.exe"

Network activity (URLs)

No activity has been detected.

Rootkit activity

No anomalies have been detected.

Propagation


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):

    attrib.exe:1820
    attrib.exe:376
    f0b6eecc73f296ea3c26328d58d67b04.exe:676

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

    %Documents and Settings%\%current user%\My Documents\MSDCSC\msdcsc.exe (2105 bytes)

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

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "??????????.b" = "%Documents and Settings%\%current user%\My Documents\MSDCSC\msdcsc.exe"

  5. Remove the references to the Backdoor by modifying the following registry value(s) (How to Work with System Registry):

    [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
    "UserInit" = "%System%\userinit.exe,%Documents and Settings%\%current user%\My Documents\MSDCSC\msdcsc.exe"

  6. Reboot the computer.

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