Categories: Backdoor

Backdoor.Fynloski.S removal instruction

The Backdoor.Fynloski.S 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 Backdoor.Fynloski.S virus can do?

  • Reads data out of its own binary image
  • CAPE extracted potentially suspicious content
  • The binary contains an unknown PE section name indicative of packing
  • The binary likely contains encrypted or compressed data.
  • The executable is compressed using UPX
  • Authenticode signature is invalid
  • Behavioural detection: Injection (Process Hollowing)
  • Behavioural detection: Injection (inter-process)
  • CAPE detected the DarkComet malware family
  • Checks the CPU name from registry, possibly for anti-virtualization
  • Interacts with known DarkComet registry keys
  • Harvests cookies for information gathering
  • Creates known Fynloski/DarkComet mutexes
  • Collects information to fingerprint the system
  • Yara rule detections observed from a process memory dump/dropped files/CAPE

How to determine Backdoor.Fynloski.S?


File Info:

name: 2BE5A09D6C399DF8DE30.mlwpath: /opt/CAPEv2/storage/binaries/55f91b2a2cf95716bf751254fa74a2d89f2ae4227a0af140ec19df7e37ae9e16crc32: 5859083Cmd5: 2be5a09d6c399df8de305c5b90bf4a5csha1: 07071de7e900ccacda36de5b5a606ae31e62e29asha256: 55f91b2a2cf95716bf751254fa74a2d89f2ae4227a0af140ec19df7e37ae9e16sha512: 92fd3802c8ef94223573497722b6c5cf33e7dfdb17097675479dfca6656f36572628940369b9b7cdf5c1d3ac9ae996967b76f719ebedf18a1ccd9d8148ce2107ssdeep: 6144:z1iJcYtR1HsvpSHY7KoSrfTNBuzZZcA1wnOLrMM4HIXLLwMdWnpQZh9h4:zkHcpSHY7VSrfT2/czO3H+IgMd0QZh9utype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T17A74F1E2BAD4AF21C11038FAAD3195E546692C9A4E10C7037678BB0F7D724D3DFA261Dsha3_384: e223f453d3819a59fcc8e9938a1febdd039f731a267ab088e9b9409424f96272ee7a0517846a34d9ecad248b4ac5b9f0ep_bytes: 60be00701d138dbe00a0f6ff5783cdfftimestamp: 2011-04-25 20:25:55

Version Info:

0: [No Data]

Backdoor.Fynloski.S also known as:

Bkav W32.AIDetectMalware
Lionic Trojan.Win32.Agent.m!c
Elastic malicious (moderate confidence)
Cynet Malicious (score: 100)
CAT-QuickHeal Backdoor.Fynloski.A9
McAfee GenericRXAA-AA!2BE5A09D6C39
Cylance unsafe
Zillya Backdoor.Agent.Win32.69928
Sangfor Virus.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
K7GW Trojan ( 7000000f1 )
K7AntiVirus Trojan ( 7000000f1 )
Baidu Win32.Backdoor.Agent.l
VirIT Trojan.Win32.Delf.XZH
Cyren W32/Downloader.C.gen!Eldorado
Symantec Backdoor.Krademok
tehtris Generic.Malware
ESET-NOD32 Win32/Delf.OAZ
APEX Malicious
ClamAV Win.Trojan.Darkkomet-6964354-1
Kaspersky Backdoor.Win32.Agent.bjev
BitDefender Backdoor.Fynloski.S
NANO-Antivirus Trojan.Win32.DarkKomet.wcwjb
SUPERAntiSpyware Heur.Agent/Gen-FakeChrome
MicroWorld-eScan Backdoor.Fynloski.S
Avast Win32:Trojan-gen
Tencent Win32.Backdoor.Agent.Vwhl
TACHYON Trojan/W32.DP-Pincav.774144
Emsisoft Backdoor.Fynloski.S (B)
F-Secure Backdoor.BDS/Backdoor.Gen
DrWeb BackDoor.Comet.21
VIPRE Backdoor.Fynloski.S
TrendMicro BKDR_FYNLOS.SMIA
McAfee-GW-Edition BehavesLike.Win32.Dropper.fc
Trapmine malicious.moderate.ml.score
FireEye Generic.mg.2be5a09d6c399df8
Sophos Mal/DelfInj-A
SentinelOne Static AI – Malicious PE
Jiangmin Backdoor/Agent.cura
Webroot W32.Backdoor.Agent
Avira BDS/Backdoor.Gen
Antiy-AVL Trojan/Win32.Siscos
Microsoft Trojan:Win32/Wacatac.B!ml
Xcitium Malware@#2qw5uue56d3rz
Arcabit Backdoor.Fynloski.S
ViRobot Backdoor.Win32.A.Agent.279552[UPX]
ZoneAlarm Backdoor.Win32.Agent.bjev
GData Win32.Trojan.PSE.1Y6NT5X
Google Detected
AhnLab-V3 Trojan/Win32.Scar.R2290
VBA32 Backdoor.Agent
ALYac Backdoor.Fynloski.S
MAX malware (ai score=84)
Malwarebytes Malware.AI.3478167334
Panda Trj/Genetic.gen
TrendMicro-HouseCall BKDR_FYNLOS.SMIA
Rising Backdoor.Fynloski!8.1FD (TFE:5:pVBxcwzwTJL)
Yandex Trojan.Comet.Gen.LO
Ikarus Trojan.Win32.CDur
MaxSecure Backdoor.Agent.bjev
Fortinet W32/COMDAR.SMI!tr
BitDefenderTheta AI:Packer.9D8A8DA919
AVG Win32:Trojan-gen
DeepInstinct MALICIOUS

How to remove Backdoor.Fynloski.S?

  • 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.
Paul Valéry

I'm a cyber security analyst and data science expert with 5+ years of experience with security software contractors.

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