Categories: Risk

RiskTool.NSIS.ExtInstall.b removal guide

The RiskTool.NSIS.ExtInstall.b 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 RiskTool.NSIS.ExtInstall.b virus can do?

  • SetUnhandledExceptionFilter detected (possible anti-debug)
  • Creates RWX memory
  • Anomalous file deletion behavior detected (10+)
  • A process attempted to delay the analysis task.
  • Dynamic (imported) function loading detected
  • A named pipe was used for inter-process communication
  • Enumerates running processes
  • Reads data out of its own binary image
  • Authenticode signature is invalid
  • Uses Windows utilities for basic functionality
  • Uses Windows utilities for basic functionality
  • Sniffs keystrokes
  • Creates or sets a registry key to a long series of bytes, possibly to store a binary or malware config
  • Steals private information from local Internet browsers
  • Collects and encrypts information about the computer likely to send to C2 server
  • Attempts to identify installed AV products by installation directory
  • Attempts to masquerade or mimic a legitimate process or file name
  • Uses suspicious command line tools or Windows utilities

How to determine RiskTool.NSIS.ExtInstall.b?


File Info:

name: F85AEFC6BA99521A0607.mlwpath: /opt/CAPEv2/storage/binaries/004089c63485d08d2bf67a01d17c8e0ff8fe09e21ed8e03604be6db8450f21c0crc32: 136243C7md5: f85aefc6ba99521a0607cfb7e96bfd3asha1: 36095445210290cb9d2529676fbdc884b222b63asha256: 004089c63485d08d2bf67a01d17c8e0ff8fe09e21ed8e03604be6db8450f21c0sha512: 56864bee9bfd9338c25917108bb312a3685e5902cac2b382c07b92df47f78a1a2b2c71e5752c3b5fe527e62107e2086c7c0f8c7d2f7c80160a2a4dceedb3a5b6ssdeep: 6144:Us3jkaLhGwE3Q7J8vYC7Qwrz5r4ddYVW4bvhlHQ0MlnUi:Tj39GwEsJ8BFz5cdeVLbHM1Uitype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T17EA423D024D4D46FD427B9F599A2D17BCBB2AE4425350D8B8B3836ABB031483CD2679Esha3_384: db8e9805aa37f3e01f3962b2d205b106423ed3e0c161f47be4b5e0b69200ecb955804351917ad98d97e652de45de008eep_bytes: 81ec8001000053555633db57895c2418timestamp: 2009-12-05 22:50:46

Version Info:

0: [No Data]

RiskTool.NSIS.ExtInstall.b also known as:

Bkav W32.AIDetect.malware2
Elastic malicious (high confidence)
DrWeb Trojan.Extenbro.10
MicroWorld-eScan Trojan.GenericKD.3356926
FireEye Trojan.GenericKD.3356926
McAfee Generic.afy
Cylance Unsafe
Zillya Trojan.ExtenBro.Win32.61063
Sangfor Suspicious.Win32.Graftor.296934
K7AntiVirus Trojan ( 004f42bc1 )
Alibaba AdWare:Win32/ExtInstall.a47c0067
K7GW Trojan ( 004f42bc1 )
BitDefenderTheta Gen:NN.ZedlaF.34182.gu4@aSuILLoi
Cyren W32/Wacapew.BF.gen!Eldorado
Symantec ML.Attribute.HighConfidence
ESET-NOD32 multiple detections
TrendMicro-HouseCall TROJ_GEN.R002C0PH421
Kaspersky not-a-virus:RiskTool.NSIS.ExtInstall.b
BitDefender Trojan.GenericKD.3356926
NANO-Antivirus Trojan.Win32.ExtenBro.eefnde
SUPERAntiSpyware PUP.SmartBrowser/Variant
Avast Win32:Malware-gen
Rising Trojan.ExtenBro!8.51 (CLOUD)
Sophos Mal/Generic-S
Comodo ApplicUnwnt@#k5zdcgiqryew
VIPRE Trojan.Win32.Generic!BT
TrendMicro TROJ_GEN.R002C0PH421
McAfee-GW-Edition BehavesLike.Win32.AdwareSweet.gc
Emsisoft Trojan.GenericKD.3356926 (B)
SentinelOne Static AI – Suspicious PE
Webroot W32.Trojan.Gen
Avira HEUR/AGEN.1203625
MAX malware (ai score=88)
Kingsoft Win32.Troj.Generic_a.a.(kcloud)
Microsoft Trojan:Win32/Dynamer!rfn
ZoneAlarm not-a-virus:RiskTool.NSIS.ExtInstall.b
GData Gen:Variant.Bulz.422186
Cynet Malicious (score: 100)
ALYac Gen:Variant.Bulz.422186
VBA32 Trojan.Wacatac
APEX Malicious
Tencent Win32.Trojan.Strictor.Eddq
Yandex Trojan.GenAsa!MmOfhgQT3mI
Fortinet W32/Generic.AC.389DBA!tr
AVG Win32:Malware-gen
Cybereason malicious.6ba995
Panda Trj/CI.A

How to remove RiskTool.NSIS.ExtInstall.b?

  • 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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Paul Valéry

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