Categories: Malware

Should I remove “PWS:Win32/Yokoyou.A”?

The PWS:Win32/Yokoyou.A 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 PWS:Win32/Yokoyou.A virus can do?

  • Sample contains Overlay data
  • Reads data out of its own binary image
  • 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
  • Yara rule detections observed from a process memory dump/dropped files/CAPE

How to determine PWS:Win32/Yokoyou.A?


File Info:

name: 256FDAC66AC07D771D67.mlwpath: /opt/CAPEv2/storage/binaries/2127b57d4a20d52df5fecbcf7541dc76fee1a7aebeeb94b0bfff8747489a5cf2crc32: 479C1136md5: 256fdac66ac07d771d6753cb05630897sha1: 0ecde3498b221c66477fbc0f8f1568370712afc0sha256: 2127b57d4a20d52df5fecbcf7541dc76fee1a7aebeeb94b0bfff8747489a5cf2sha512: acab9608e12d11c67e8281415827ac5b1d157e1dd3bd59a9beed589aaba7d9c72ffaa0aa93aba4208178e29c40be091ab471563182d694937826e7cf4771e086ssdeep: 768:sFTT/XdwSt0nPg7sL/nKMdNvfbY6Eg50X7ZGrFvuBYk7co/nGeNlnbcuyD7UM:4rXmlntHvhEm0rZwSGIlnouy8Mtype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T10C23F297487F4D67C0AFA63D05172D633634B31DA2E6AA10F3E8102589D2F4409EBE23sha3_384: 2660b4303c7bbead43bb5d57efe55658bfcd4d3062fb37a44cbe6d401a2c558b976d70bf0909e07bd137855d646a6f71ep_bytes: 60be008041008dbe0090feff5789e58dtimestamp: 1970-01-01 01:08:16

Version Info:

0: [No Data]

PWS:Win32/Yokoyou.A also known as:

Lionic Worm.Win32.VBNA.lsf3
DrWeb BackDoor.Pigeon.origin
MicroWorld-eScan Gen:Trojan.Heur.DP.dmHfaCTM5Mf
FireEye Generic.mg.256fdac66ac07d77
CAT-QuickHeal TrojanPSW.Delf.12609
Skyhigh BehavesLike.Win32.Generic.pc
ALYac Gen:Trojan.Heur.DP.dmHfaCTM5Mf
Malwarebytes Malware.Heuristic.2047
VIPRE Gen:Trojan.Heur.DP.dmHfaCTM5Mf
Sangfor Suspicious.Win32.Save.a
BitDefender Gen:Trojan.Heur.DP.dmHfaCTM5Mf
Cybereason malicious.98b221
BitDefenderTheta AI:Packer.E66FAD561E
Symantec ML.Attribute.HighConfidence
Elastic malicious (moderate confidence)
ESET-NOD32 a variant of Win32/PSW.Delf.NXE
APEX Malicious
ClamAV Win.Trojan.ShellHook-4
Kaspersky Trojan-GameThief.Win32.Agent.a
Alibaba TrojanPSW:Win32/Yokoyou.384fc29e
NANO-Antivirus Trojan.Win32.Agent.bqzws
Rising Backdoor.Hupigon!8.B57 (CLOUD)
Sophos Mal/Generic-S
F-Secure Dropper.DR/Delphi.Gen
Zillya Backdoor.Hupigon.Win32.151449
TrendMicro Cryp_Xed-12
Trapmine malicious.high.ml.score
Emsisoft Gen:Trojan.Heur.DP.dmHfaCTM5Mf (B)
SentinelOne Static AI – Malicious PE
Jiangmin Heur:Trojan/GamePass
Google Detected
Avira DR/Delphi.Gen
Varist W32/Hijack.A.gen!Eldorado
Kingsoft malware.kb.b.999
Microsoft PWS:Win32/Yokoyou.A
Xcitium TrojWare.Win32.PSW.Delf.~AO@yfmji
Arcabit Trojan.Heur.DP.dmHfaCTM5Mf
ZoneAlarm Trojan-GameThief.Win32.Agent.a
GData Gen:Trojan.Heur.DP.dmHfaCTM5Mf
Cynet Malicious (score: 100)
Acronis suspicious
McAfee Artemis!256FDAC66AC0
DeepInstinct MALICIOUS
VBA32 TrojanDropper.Delf
Cylance unsafe
Panda Trj/CI.A
TrendMicro-HouseCall Cryp_Xed-12
Tencent Win32.Trojan-GameThief.Agent.Dtgl
Yandex Trojan.GenAsa!0+HAA3x5pz4
Ikarus Trojan-GameThief.Win32.OnLineGames
MaxSecure Trojan.Malware.300983.susgen
Fortinet W32/HookSend.C!tr
AVG Win32:Trojan-gen
Avast Win32:Trojan-gen
CrowdStrike win/malicious_confidence_100% (W)

How to remove PWS:Win32/Yokoyou.A?

  • 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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