Worm.Win32.Ainslot.VB_7f3a698df3

by malwarelabrobot on September 2nd, 2013 in Malware Descriptions.

HEUR:Trojan.Win32.Generic (Kaspersky), Trojan.Win32.Generic!BT (VIPRE), Trojan.Inject!IK (Emsisoft), Backdoor.Win32.PcClient.FD, Worm.Win32.Ainslot.VB.FD, GenericAutorunWorm.YR, WormAinslot_VariantOfZeus.YR (Lavasoft MAS)
Behaviour: Trojan, Backdoor, Worm, WormAutorun


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: 7f3a698df30e4534b6a08c2602a5ff2d
SHA1: b837c6921fbb30f9b512e027d2be2544b3b00cdf
SHA256: be1bfb213e586ea35963207266a53822a215333e5a03e858e5bcf72374f2a848
SSDeep: 6144:mfaodNQFXf/05 QUFPAaR8NYDIKIaIhWkjTO3yv1nys0DKRgJFx:OaiQx8jAPAO8NYE1aIhVF9ys0DsgXx
Size: 294912 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: MicrosoftVisualC, NETexecutable, UPolyXv05_v6
Company: StarApp
Created at: 2012-09-15 16:57:32


Summary:

Worm. A program that is primarily replicating on networks or removable drives.

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 Worm's file once a user opens a drive's folder in Windows Explorer.


Process activity

The Worm creates the following process(es):

Reader_sl.exe:1064
wuauclt.exe:344
7f3a698df30e4534b6a08c2602a5ff2d.exe:440
rundll32.exe:404
reg.exe:392
reg.exe:520
reg.exe:696
reg.exe:424
jusched.exe:1056
dumprep.exe:344
dumprep.exe:548

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

msconfig.exe:1720

File activity

The process msconfig.exe:1720 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\WER3a9e.dir00\appcompat.txt (6760 bytes)
%Documents and Settings%\%current user%\Application Data\IDM77.exe (35 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\WER3a9e.dir00\manifest.txt (7108 bytes)

The process wuauclt.exe:344 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%WinDir%\SoftwareDistribution\DataStore\Logs\edb.chk (100 bytes)
%WinDir%\SoftwareDistribution\DataStore\Logs\edb.log (3576 bytes)
%WinDir%\SoftwareDistribution\DataStore\DataStore.edb (100 bytes)

The Worm deletes the following file(s):

%WinDir%\SoftwareDistribution\DataStore\Logs\tmp.edb (0 bytes)

The process 7f3a698df30e4534b6a08c2602a5ff2d.exe:440 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\msconfig.exe (35 bytes)

The process jusched.exe:1056 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\jusched.log (347 bytes)

The process dumprep.exe:344 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\WER3a9e.dir00\msconfig.exe.hdmp (216743 bytes)

The process dumprep.exe:548 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\WER3a9e.dir00\msconfig.exe.mdmp (101401 bytes)

Registry activity

The process msconfig.exe:1720 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "DD C8 2B FA 6D EA C2 67 AE B1 49 54 8F 24 F1 28"

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

[HKCU\Software\VB and VBA Program Settings\SrvID\ID]
"TMQRTOOYDV" = "IDM77"

[HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
"TMQRTOOYDV" = "September 1, 2013"

The Worm deletes the following registry key(s):

[HKLM\SOFTWARE\Microsoft\PCHealth\ErrorReporting\DW]

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

[HKLM\SOFTWARE\Microsoft\PCHealth\ErrorReporting\DW]
"DWFileTreeRoot"

The process Reader_sl.exe:1064 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"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\{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\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

The process 7f3a698df30e4534b6a08c2602a5ff2d.exe:440 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "21 F9 6D 42 43 AD CA F0 A7 A1 BC 3B A6 B0 FA A5"

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

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Windows Live" = "c:\7f3a698df30e4534b6a08c2602a5ff2d.exe"

The process rundll32.exe:404 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D9 D7 F8 31 53 52 DA B9 46 BA F1 AB 03 A0 68 AA"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers\%Documents and Settings%\%current user%\Application Data]
"msconfig.exe" = "EnableNXShowUI"

[HKLM\System\CurrentControlSet\Control\Session Manager\AppCompatibility]
"AppCompatCache" = "EF BE AD DE 60 00 00 00 00 00 00 00 00 00 00 00"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Application Data]
"msconfig.exe" = "Microsoft® Resource File To COFF Object Conversion Utility"

The process reg.exe:392 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "4A 2A 8F EA 67 B5 7B 06 06 20 B5 6A D0 78 12 B6"

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"DoNotAllowExceptions" = "0"

The process reg.exe:520 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D6 64 AC 7B F7 83 92 8C 09 5A 1C 03 03 5D 2F B5"

Adds a rule to the firewall Windows which allows any network activity:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%Documents and Settings%\%current user%\Application Data]
"IDM77.exe" = "%Documents and Settings%\%current user%\Application Data\IDM77.exe:*:Enabled:Windows Messanger"

The process reg.exe:696 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "F5 0B 5B C0 BD D2 57 4B 47 C6 42 CF 09 E7 3D E6"

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"DoNotAllowExceptions" = "0"

The process reg.exe:424 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5E 96 C7 86 77 CA 4D 45 15 5C 46 44 CA 5B 8D F7"

Adds a rule to the firewall Windows which allows any network activity:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%Documents and Settings%\%current user%\Application Data]
"msconfig.exe" = "%Documents and Settings%\%current user%\Application Data\msconfig.exe:*:Enabled:Windows Messanger"

The process dumprep.exe:344 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "E0 AF 65 BC DB 96 14 19 3C 2C 02 4E F3 71 E8 F8"

The process dumprep.exe:548 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "F0 47 A2 02 70 BE F8 55 E2 96 D5 7A 5C B0 1E 52"

Network activity (URLs)

No activity has 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 Worm's file once a user opens a drive's folder in Windows Explorer.


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):

    wuauclt.exe:344
    7f3a698df30e4534b6a08c2602a5ff2d.exe:440
    rundll32.exe:404
    reg.exe:392
    reg.exe:520
    reg.exe:696
    reg.exe:424
    dumprep.exe:344
    dumprep.exe:548

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

    %Documents and Settings%\%current user%\Local Settings\Temp\WER3a9e.dir00\appcompat.txt (6760 bytes)
    %Documents and Settings%\%current user%\Application Data\IDM77.exe (35 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\WER3a9e.dir00\manifest.txt (7108 bytes)
    %WinDir%\SoftwareDistribution\DataStore\Logs\edb.chk (100 bytes)
    %WinDir%\SoftwareDistribution\DataStore\Logs\edb.log (3576 bytes)
    %WinDir%\SoftwareDistribution\DataStore\DataStore.edb (100 bytes)
    %Documents and Settings%\%current user%\Application Data\msconfig.exe (35 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\jusched.log (347 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\WER3a9e.dir00\msconfig.exe.hdmp (216743 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\WER3a9e.dir00\msconfig.exe.mdmp (101401 bytes)

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

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "Windows Live" = "c:\7f3a698df30e4534b6a08c2602a5ff2d.exe"

  5. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
  6. Reboot the computer.

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