PHP/C99Shell.NAG removal guide

The PHP/C99Shell.NAG is considered dangerous by lots of security experts. When this infection is active, you may notice unwanted processes in Task Manager list. In this case, it is adviced to scan your computer with GridinSoft Anti-Malware.

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What PHP/C99Shell.NAG virus can do?

Injection (inter-process)
Injection with CreateRemoteThread in a remote process
Reads data out of its own binary image
Uses Windows utilities for basic functionality
A potential decoy document was displayed to the user
Network activity detected but not expressed in API logs

Related domains:

z.whorecord.xyz

a.tomx.xyz

How to determine PHP/C99Shell.NAG?


File Info:
crc32: C281E236
md5: 05a8ff83630f93722c194c6ce4df926b
name: upload_file
sha1: 1ab99d0e95e59584c412d18e69ee9db122d7858d
sha256: 5b29fd6f5db09bcdb632d9dade407f5a17ba1967d485fd2f5c8ee3dab857bb46
sha512: 77a84e25ad8fcf9b11eedc60d72bf7f6f0286aafabd2b21ced3d02777344a41cf36109952a59817422c712eb2079559d1f3ea89e711bf28e6d8f8c64d39ed7e3
ssdeep: 6144:Z+e69dFFURJ3T2+GaYNu5l2kAh0ut+VCaxvJt1YzOvqdlW:ZP6jFSP3TKNu5ltkCqdg
type: PHP script, ASCII text, with very long lines, with CRLF line terminators

Version Info:
0: [No Data]

PHP/C99Shell.NAG also known as:

Bkav	VEX.Webshell
MicroWorld-eScan	Trojan.GenericKD.42898024
CAT-QuickHeal	HTML.BackDoor.A
VIPRE	Backdoor.HTML.PHPShell-Interface (v)
AegisLab	Trojan.Script.Shell.4!c
Sangfor	Malware
F-Prot	PHP/C99Shell.E
Symantec	PHP.Backdoor.Trojan
ESET-NOD32	PHP/C99Shell.NAG
Baidu	PHP.Backdoor.C99Shell.a
TrendMicro-HouseCall	PHP_C99SHEL.SMA
Avast	HTML:BackDoor-B [Trj]
ClamAV	Php.Trojan.C99Shell-2
BitDefender	Trojan.GenericKD.42898024
NANO-Antivirus	Trojan.Script.Shellbot.vsqwc
Rising	Trojan.C99Shell!8.AA (TOPIS:E0:TPXI0LLXmFC)
Ad-Aware	Trojan.GenericKD.42898024
Emsisoft	Trojan.GenericKD.42898024 (B)
Comodo	Backdoor.PHP.Agent.PH@4potom
F-Secure	Malware.PHP/C99Shell.A
DrWeb	PHP.Shellbot.28
TrendMicro	PHP_C99SHEL.SMA
FireEye	Trojan.GenericKD.42898024
Sophos	Mal/PHPShell-A
Cyren	PHP/C99Shell.E
Avira	PHP/C99Shell.A
Fortinet	PHP/Shell.NAG!tr
Arcabit	Trojan.Generic.D28E9268
Cynet	Malicious (score: 85)
AhnLab-V3	JS/SARS.S37
VBA32	Backdoor.PHP.C99Shell.y
ALYac	Backdoor.PHP.C99Shell.A
MAX	malware (ai score=84)
Tencent	Bk.YDWebShell.PHP.C99ShellGen.11100808
Yandex	PHP.ShellBot.K
Ikarus	Backdoor.PHP.C99Shell.y
MaxSecure	Virus.Backdoor.PHP.C99Shell.l
GData	Trojan.GenericKD.42898024
AVG	HTML:BackDoor-B [Trj]
Panda	PHP/C99Shell.B
Qihoo-360	php.script.c99shell.10

How to remove PHP/C99Shell.NAG?

Download and install GridinSoft Anti-Malware.
Open GridinSoft Anti-Malware and perform a “Standard scan“.
“Move to quarantine” all items.
Open “Tools” tab – Press “Reset Browser Settings“.
Select proper browser and options – Click “Reset”.
Restart your computer.

PHP/C99Shell.NAG removal guide