Categories: Trojan

How to remove “Trojan.Downloader.Farfly.L”?

The Trojan.Downloader.Farfly.L 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 Trojan.Downloader.Farfly.L virus can do?

  • SetUnhandledExceptionFilter detected (possible anti-debug)
  • Yara rule detections observed from a process memory dump/dropped files/CAPE
  • Checks adapter addresses which can be used to detect virtual network interfaces
  • Possible date expiration check, exits too soon after checking local time
  • Creates RWX memory
  • Loads a driver
  • Dynamic (imported) function loading detected
  • Performs HTTP requests potentially not found in PCAP.
  • HTTPS urls from behavior.
  • Enumerates running processes
  • CAPE extracted potentially suspicious content
  • Unconventionial binary language: Chinese (Simplified)
  • Unconventionial language used in binary resources: Chinese (Simplified)
  • 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
  • Installs itself for autorun at Windows startup
  • Installs itself for autorun at Windows startup
  • Creates a hidden or system file
  • Attempts to modify proxy settings

How to determine Trojan.Downloader.Farfly.L?


File Info:

name: 55B4CFF8AF764B09F000.mlwpath: /opt/CAPEv2/storage/binaries/05a878ab0e0f5a43c3f64575cbfeb50268d53751a6bf739a6de7519ab10a509ccrc32: 7ADAB891md5: 55b4cff8af764b09f000cfd03ed04b95sha1: 09efb8bc5d98047abfbb956bbac14273b6204a56sha256: 05a878ab0e0f5a43c3f64575cbfeb50268d53751a6bf739a6de7519ab10a509csha512: aad70067d7e3ff8d17089e95f782a613178fa11a5b6c4efad3cdf65754974a0749bd5bfbe9c19fb0da75efbb74430b7d48dacb3457138f304a0b547963b58917ssdeep: 1536:4Ha+5mc5Aw/tmI2Cqa+Prh3Hqn11k0s+1:4HX5mcWn93Hetype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T1D75301BAF36D5268F6BB49728A190BBA5240DC581F0C778735ABE1474CF52254C40EDBsha3_384: f1a33c089ea733a26f36a0708d0a6889c20a8432f65c78d910d0bac988188d71396f8a5d361bb1cea94cf0d6c948ffa0ep_bytes: 60be00c040008dbe0050ffff5783cdfftimestamp: 2010-06-07 15:26:15

Version Info:

CompanyName: Microsoft CorporationFileDescription: FileVersion: 1, 0, 0, 0LegalCopyright: Copyright 2010ProductVersion: 1, 0, 0, 0Translation: 0x0804 0x04b0

Trojan.Downloader.Farfly.L also known as:

Elastic malicious (moderate confidence)
DrWeb Trojan.Swizzor.18231
MicroWorld-eScan Trojan.Downloader.Farfly.L
FireEye Generic.mg.55b4cff8af764b09
CAT-QuickHeal VirTool.Koutdoor.A
ALYac Trojan.Downloader.Farfly.L
Cylance Unsafe
Zillya Backdoor.Koutodoor.Win32.111
Sangfor Trojan.Win32.Save.a
K7AntiVirus Trojan ( 005376ae1 )
K7GW Trojan ( 005376ae1 )
Cybereason malicious.8af764
BitDefenderTheta Gen:NN.ZexaF.34592.dmKfaSOq7Neb
Cyren W32/Koutodoor.L.gen!Eldorado
Symantec Trojan Horse
ESET-NOD32 a variant of Win32/Koutodoor.GN
TrendMicro-HouseCall TROJ_KTODOOR.SMF
Paloalto generic.ml
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Trojan.Downloader.Farfly.L
NANO-Antivirus Trojan.Win32.MlwGen.bbulto
Avast Win32:Crypt-GRN [Drp]
Tencent Malware.Win32.Gencirc.10c8e625
Ad-Aware Trojan.Downloader.Farfly.L
Emsisoft Trojan.Downloader.Farfly.L (B)
Comodo TrojWare.Win32.Trojan.XPack.~gen1@1rwlif
Baidu Win32.Rootkit.Koutodoor.a
VIPRE Trojan.Downloader.Farfly.L
TrendMicro TROJ_KTODOOR.SMF
McAfee-GW-Edition BehavesLike.Win32.Fake.qc
Trapmine malicious.moderate.ml.score
Sophos ML/PE-A + Mal/Behav-160
Ikarus Backdoor.Win32.Koutodoor
GData Trojan.Downloader.Farfly.L
Jiangmin Trojan/Generic.myp
Google Detected
Avira TR/Crypt.XPACK.Gen
Antiy-AVL Trojan/Generic.ASMalwS.D5
Microsoft Trojan:Win32/Wacatac.B!ml
Cynet Malicious (score: 100)
AhnLab-V3 Win-Trojan/Koutodoor5.Gen
McAfee GenericRXIT-XT!55B4CFF8AF76
MAX malware (ai score=80)
VBA32 Backdoor.Koutodoor
Malwarebytes Malware.Heuristic.1003
APEX Malicious
Rising Dropper.Win32.Fedon.b (CLOUD)
SentinelOne Static AI – Malicious PE
MaxSecure Trojan.Malware.300983.susgen
Fortinet W32/Koutodoor.D!tr.bdr
AVG Win32:Crypt-GRN [Drp]
Panda Bck/Koutodoor.E
CrowdStrike win/malicious_confidence_100% (W)

How to remove Trojan.Downloader.Farfly.L?

  • 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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