What is “Backdoor:MSIL/QuasarRAT.RAB!MSR”?

The Backdoor:MSIL/QuasarRAT.RAB!MSR 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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Removing PC viruses manually may take hours and may damage your PC in the process. We recommend using GridinSoft Anti-Malware for virus removal. Allows to complete scan and cure your PC during the trial period.

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What Backdoor:MSIL/QuasarRAT.RAB!MSR virus can do?

The binary likely contains encrypted or compressed data.
Network activity detected but not expressed in API logs
Anomalous binary characteristics

How to determine Backdoor:MSIL/QuasarRAT.RAB!MSR?


File Info:
crc32: 36DF2E8E
md5: cec5e18e4de920a7a1cfff963a12feaa
name: as1.exe
sha1: c6f755bc805bacd308ed37ccfa9f71e33999e241
sha256: c52997a1d40583077830655c9c15d14508e3461934a5690f7fa61be86bd7f4a3
sha512: db80479b5ff8e78f2907cdaf4a5176a92079dfac51b3400316e70943276599046acb6dacd167a00e937e3d9685dca8c3484b1fc0d2035275232f62cbd6806944
ssdeep: 98304:dFEGxjhVRpYRcvk0ZwaEw74AL3NGgs9ndPDFhlq2M9LbO4CvXCuGMvVs03mW3Fps:HFxVVReRCk0GaEw7R7NGg4Ppgu4ULN56
type: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:
Translation: 0x0000 0x04b0
LegalCopyright: Copyright InsightTwister 2020
Assembly Version: 1.0.0.0
InternalName: InsightTwister.exe
FileVersion: 1.0.0.0
CompanyName: 
LegalTrademarks: 
Comments: 
ProductName: InsightTwister
ProductVersion: 1.0.0.0
FileDescription: InsightTwister
OriginalFilename: InsightTwister.exe

Backdoor:MSIL/QuasarRAT.RAB!MSR also known as:

MicroWorld-eScan	Gen:Variant.MSILPerseus.224351
ALYac	Gen:Variant.MSILPerseus.224351
Cylance	Unsafe
BitDefender	Gen:Variant.MSILPerseus.224351
Cybereason	malicious.c805ba
Symantec	ML.Attribute.HighConfidence
APEX	Malicious
ClamAV	Win.Packed.Bladabindi-6960770-0
GData	Gen:Variant.MSILPerseus.224351
Ad-Aware	Gen:Variant.MSILPerseus.224351
Emsisoft	Gen:Variant.MSILPerseus.224351 (B)
F-Secure	Heuristic.HEUR/AGEN.1112869
Invincea	heuristic
McAfee-GW-Edition	Artemis!Trojan
Trapmine	malicious.moderate.ml.score
FireEye	Generic.mg.cec5e18e4de920a7
Avira	HEUR/AGEN.1112869
MAX	malware (ai score=83)
Antiy-AVL	Trojan/MSIL.Packed.Confuser.P
Endgame	malicious (high confidence)
Arcabit	Trojan.MSILPerseus.D36C5F
Microsoft	Backdoor:MSIL/QuasarRAT.RAB!MSR
Acronis	suspicious
McAfee	Artemis!CEC5E18E4DE9
ESET-NOD32	a variant of MSIL/Kryptik.QMO
SentinelOne	DFI – Malicious PE
eGambit	Unsafe.AI_Score_100%
BitDefenderTheta	Gen:NN.ZemsilF.34122.@t3@aWai7mf
AVG	FileRepMalware
CrowdStrike	win/malicious_confidence_60% (D)
Qihoo-360	HEUR/QVM03.0.8AA0.Malware.Gen

How to remove Backdoor:MSIL/QuasarRAT.RAB!MSR?

Backdoor:MSIL/QuasarRAT.RAB!MSR removal tool

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.

About the author

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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