Categories: Trojan

What is “Trojan:Win32/Formbook.AC!MTB”?

The Trojan:Win32/Formbook.AC!MTB 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 Trojan:Win32/Formbook.AC!MTB virus can do?

  • Behavioural detection: Executable code extraction – unpacking
  • Yara rule detections observed from a process memory dump/dropped files/CAPE
  • Creates RWX memory
  • NtSetInformationThread: attempt to hide thread from debugger
  • Possible date expiration check, exits too soon after checking local time
  • Dynamic (imported) function loading detected
  • CAPE extracted potentially suspicious content
  • Authenticode signature is invalid
  • Behavioural detection: Injection (Process Hollowing)
  • Executed a process and injected code into it, probably while unpacking
  • Behavioural detection: Injection (inter-process)
  • Created a process from a suspicious location

How to determine Trojan:Win32/Formbook.AC!MTB?


File Info:

name: 23BBCF4AFA025004FE08.mlwpath: /opt/CAPEv2/storage/binaries/3c33e6937e13636c74f6af17483efa0ce5985fa4cf24fa3b67aab656bd3d14a8crc32: 4BA681EBmd5: 23bbcf4afa025004fe089a67cf444068sha1: 52f5b7911b81e7642a3ca57a82da9985b8651b96sha256: 3c33e6937e13636c74f6af17483efa0ce5985fa4cf24fa3b67aab656bd3d14a8sha512: 29a88f3181f65ee13fa2a6ec87a16558df9449f9f95c51d078c9b09416e389db30e19588aad0e69642ad3071a25b16f4da56a246a1a6b1a47e0eb222904481b8ssdeep: 1536:zrTK7c6PAk8EJPPPPXMCiq1MU5BPWQjo4iktl:zSPjJPPPPXUNM1WN4Ptype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T18B632852F712E9B1D59443754D37CAB012237D329C614A17BADA3F1F2CF32928A63A4Bsha3_384: aaf8996b872db44c523c4479c390c9fa3508e7265452c9facce9c122038a18db2a34f72736a3adb3815a95e8e3190f30ep_bytes: 6898134000e8f0ffffff000000000000timestamp: 2012-04-28 09:42:04

Version Info:

Translation: 0x0409 0x04b0ProductName: SKURVOGNFileVersion: 1.00ProductVersion: 1.00InternalName: FloromvundOriginalFilename: Floromvund.exe

Trojan:Win32/Formbook.AC!MTB also known as:

Bkav W32.AIDetect.malware2
Lionic Trojan.Multi.Generic.4!c
Elastic malicious (high confidence)
DrWeb Trojan.DownLoader33.10024
MicroWorld-eScan Gen:Heur.PonyStealer.em0@qWvtrubi
FireEye Generic.mg.23bbcf4afa025004
ALYac Trojan.Agent.Wacatac
Cylance Unsafe
Zillya Trojan.Injector.Win32.690867
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Backdoor:Win32/Remcos.286
K7GW Riskware ( 0040eff71 )
K7AntiVirus Riskware ( 0040eff71 )
Arcabit Trojan.PonyStealer.E65DA0
BitDefenderTheta Gen:NN.ZevbaF.34294.em0@aWvtrubi
Cyren W32/Injector.ZO.gen!Eldorado
ESET-NOD32 a variant of Win32/Injector.EKVC
TrendMicro-HouseCall TrojanSpy.Win32.FAREIT.DYSGUM
Paloalto generic.ml
ClamAV Win.Dropper.Fareitvb-7604866-0
Kaspersky Trojan-Spy.Win32.Noon.avnv
BitDefender Gen:Heur.PonyStealer.em0@qWvtrubi
NANO-Antivirus Trojan.Win32.Noon.hdyixz
Avast Win32:Trojan-gen
Rising Downloader.Guloader!1.C918 (CLASSIC)
Ad-Aware Gen:Heur.PonyStealer.em0@qWvtrubi
Emsisoft Trojan.Injector (A)
VIPRE Trojan.Win32.Generic!BT
TrendMicro TrojanSpy.Win32.FAREIT.DYSGUM
McAfee-GW-Edition BehavesLike.Win32.Fareit.kt
Sophos ML/PE-A + Mal/FareitVB-AB
Ikarus Trojan-Spy.LokiBot
Jiangmin TrojanSpy.Noon.oke
Webroot W32.Trojan.Gen
Avira TR/AD.VBCryptor.bdlu
MAX malware (ai score=80)
Antiy-AVL Trojan/Generic.ASMalwS.300E85D
Microsoft Trojan:Win32/Formbook.AC!MTB
GData Gen:Heur.PonyStealer.em0@qWvtrubi
Cynet Malicious (score: 99)
AhnLab-V3 Trojan/Win32.Inject.C4007358
McAfee Fareit-FRO!23BBCF4AFA02
VBA32 Trojan.Wacatac
Malwarebytes Trojan.MalPack.VB.Generic
APEX Malicious
Tencent Win32.Trojan-spy.Noon.Hrfn
Yandex Trojan.Injector!/EYZTB4JOxQ
SentinelOne Static AI – Malicious PE
Fortinet W32/GuLoader.VHHQ!tr
AVG Win32:Trojan-gen
Cybereason malicious.afa025
Panda Trj/GdSda.A

How to remove Trojan:Win32/Formbook.AC!MTB?

  • 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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