Categories: Trojan

What is “MSIL/TrojanDropper.Small.EF”?

The MSIL/TrojanDropper.Small.EF 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 MSIL/TrojanDropper.Small.EF virus can do?

  • Yara rule detections observed from a process memory dump/dropped files/CAPE
  • CAPE extracted potentially suspicious content
  • Drops a binary and executes it
  • The binary likely contains encrypted or compressed data.
  • Authenticode signature is invalid
  • Anomalous .NET characteristics
  • CAPE detected the CobianRAT malware family
  • Deletes executed files from disk
  • Attempts to modify Explorer settings to prevent hidden files from being displayed

How to determine MSIL/TrojanDropper.Small.EF?


File Info:

name: D663604F6F0DA2BA426C.mlwpath: /opt/CAPEv2/storage/binaries/8c1b97b3cad2f9291c84a2e26577fc3a2ab1f998a0a7c29169517ba29c06328dcrc32: A500E255md5: d663604f6f0da2ba426c62a7905300bdsha1: 14989f97d4ec8e6faa9a181bd7bc2f0ad11b9728sha256: 8c1b97b3cad2f9291c84a2e26577fc3a2ab1f998a0a7c29169517ba29c06328dsha512: 04bca8e3bf73883e8773ac28cace0ebdcd4b330c220255365982262f42ec13f31f3a7e88f07b53f0b1c473608af0d95e98fe5cff870ef9a11f5b5a999ed2c2c0ssdeep: 768:z4bs8xfDxow5K1tbwbMAN+Xh/WBiTwd7yWBY6+O6C7Cu6BLUqu/tS9UPG:U4P9+1EXhuB0wddYe17CuqLvyS9U+type: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T10163BE1A37A4E0D9E1D465341DC26F73C4F2B827180467AEBBC12E6FEE7AD85D610346sha3_384: e98a9b6ec73908ed28ccc118f6d1102f26502daf3e443fbc469f1d84bbac9e5289f5cc4b8ddb354f0916e9d5e8f1ea33ep_bytes: ff250020400000000000000000000000timestamp: 2022-08-13 10:13:32

Version Info:

Translation: 0x0000 0x04b0FileDescription: FileVersion: 0.0.0.0InternalName: Launcher.exeLegalCopyright: OriginalFilename: Launcher.exeProductVersion: 0.0.0.0Assembly Version: 0.0.0.0

MSIL/TrojanDropper.Small.EF also known as:

Bkav W32.AIDetectNet.01
Cynet Malicious (score: 99)
FireEye Generic.mg.d663604f6f0da2ba
Cylance Unsafe
Sangfor Suspicious.Win32.Save.a
K7AntiVirus Trojan ( 700000121 )
K7GW Trojan ( 700000121 )
Cybereason malicious.f6f0da
Symantec ML.Attribute.HighConfidence
Elastic malicious (high confidence)
ESET-NOD32 a variant of MSIL/TrojanDropper.Small.EF
APEX Malicious
Kaspersky HEUR:Backdoor.MSIL.Bladabindi.gen
BitDefender IL:Trojan.MSILZilla.19736
MicroWorld-eScan IL:Trojan.MSILZilla.19736
Avast Win32:RATX-gen [Trj]
Ad-Aware IL:Trojan.MSILZilla.19736
Emsisoft IL:Trojan.MSILZilla.19736 (B)
VIPRE IL:Trojan.MSILZilla.19736
Trapmine malicious.high.ml.score
Sophos ML/PE-A
GData IL:Trojan.MSILZilla.19736
Avira HEUR/AGEN.1221666
Arcabit IL:Trojan.MSILZilla.D4D18
Microsoft Program:Win32/Wacapew.C!ml
AhnLab-V3 Trojan/Win32.RL_Small.C3488454
Acronis suspicious
ALYac IL:Trojan.MSILZilla.19736
MAX malware (ai score=87)
Rising Trojan.Generic/MSIL@AI.92 (RDM.MSIL:3mC2TxezQnHrQgLEQsremQ)
SentinelOne Static AI – Malicious PE
MaxSecure Trojan.Malware.300983.susgen
Fortinet MSIL/Small.EF!tr
BitDefenderTheta Gen:NN.ZemsilF.34592.em0@aSAYP3f
AVG Win32:RATX-gen [Trj]
CrowdStrike win/malicious_confidence_100% (D)

How to remove MSIL/TrojanDropper.Small.EF?

  • 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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