Categories: Malware

Win32/Filecoder.Avaddon.C (file analysis)

The Win32/Filecoder.Avaddon.C 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 Win32/Filecoder.Avaddon.C virus can do?

  • At least one process apparently crashed during execution
  • Creates RWX memory
  • A process attempted to delay the analysis task.
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option
  • A process created a hidden window
  • Drops a binary and executes it
  • Creates an autorun.inf file
  • Uses Windows utilities for basic functionality
  • Sniffs keystrokes
  • Attempts to delete volume shadow copies
  • Attempts to repeatedly call a single API many times in order to delay analysis time
  • Modifies boot configuration settings
  • Installs itself for autorun at Windows startup
  • Creates a hidden or system file
  • Checks the system manufacturer, likely for anti-virtualization
  • Clears Windows events or logs
  • Creates a copy of itself
  • Attempts to disable UAC
  • Attempts to modify UAC prompt behavior
  • Uses suspicious command line tools or Windows utilities

How to determine Win32/Filecoder.Avaddon.C?


File Info:

crc32: DC837516md5: 9f3c7a211ff7c5dffb694031552cd9aename: 9F3C7A211FF7C5DFFB694031552CD9AE.mlwsha1: e7c0e2cd0bb1082cb50732b5af879cdbf01a0c2dsha256: fcd166d0da4f6aa25391db781b062123ffcdea0269f53bacd196c7a4474a5756sha512: 834ce8ed052b7872eb6e2d104f7bca5527f31ab7f193aab738a2ba089660b3df1d76b9e8109ceb44ee529aa8bcd1f59e37bac12fbc6c6b6c117dbb971a837e6fssdeep: 12288:2TsEoqITFUyBg3xtezkWa5W/yVuyl7gDcarm/qxLJtcCuhurME6D6ry:2TsEJ+CSg3xtezkWa5IyVb9otm/qxt2type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: xa9 Microsoft Corporation. All rights reserved.InternalName: taskhost.exeFileVersion: 10.0.17763.831 (WinBuild.160101.0800)CompanyName: Microsoft CorporationProductName: Microsoftxae Windowsxae Operating SystemProductVersion: 10.0.17763.831FileDescription: Host Process for Windows TasksOriginalFilename: taskhost.exeTranslation: 0x0409 0x04b0

Win32/Filecoder.Avaddon.C also known as:

Elastic malicious (high confidence)
McAfee GenericRXAA-AA!9F3C7A211FF7
VIPRE Trojan.Win32.Generic!BT
Sangfor Trojan.Win32.Save.a
BitDefender Gen:Variant.Ransom.Avaddon.3
CrowdStrike win/malicious_confidence_60% (D)
Arcabit Trojan.Ransom.Avaddon.3
Cyren W32/Ransom.OS.gen!Eldorado
Symantec Downloader
APEX Malicious
Avast Win32:RansomX-gen [Ransom]
Cynet Malicious (score: 100)
Kaspersky HEUR:Trojan.Win32.DelShad.gen
MicroWorld-eScan Gen:Variant.Ransom.Avaddon.3
Rising Ransom.Avaddon!1.C7A8 (C64:YzY0Onu09fjl9yel)
Ad-Aware Gen:Variant.Ransom.Avaddon.3
Emsisoft Gen:Variant.Ransom.Avaddon.3 (B)
F-Secure Heuristic.HEUR/AGEN.1136765
DrWeb Trojan.Encoder.33477
Zillya Trojan.Filecoder.Win32.17713
TrendMicro Ransom.Win32.AVADDON.SMTHA
MaxSecure Trojan.Malware.74279478.susgen
FireEye Generic.mg.9f3c7a211ff7c5df
Sophos ML/PE-A
Ikarus Trojan-Ransom.Avaddon
Jiangmin Trojan.DelShad.ayx
Avira HEUR/AGEN.1136765
MAX malware (ai score=85)
Antiy-AVL Trojan/Win32.DelShad
Microsoft Ransom:Win32/Avaddon.MK!MTB
ZoneAlarm HEUR:Trojan.Win32.DelShad.gen
GData Gen:Variant.Ransom.Avaddon.3
AhnLab-V3 Malware/Win32.Ransom.C4280530
ALYac Gen:Variant.Ransom.Avaddon.3
Malwarebytes Ransom.Avaddon
Panda Trj/GdSda.A
ESET-NOD32 a variant of Win32/Filecoder.Avaddon.C
TrendMicro-HouseCall Ransom.Win32.AVADDON.SMTHA
Yandex Trojan.DelShad!/45YM/sUdvI
SentinelOne Static AI – Suspicious PE
eGambit Unsafe.AI_Score_100%
Fortinet W32/Avaddon.C!tr.ransom
BitDefenderTheta Gen:NN.ZexaF.34590.Vu0@aGfdA!fi
AVG Win32:RansomX-gen [Ransom]
Cybereason malicious.11ff7c

How to remove Win32/Filecoder.Avaddon.C?

  • 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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