Categories: Backdoor

Backdoor.Lotok (file analysis)

The Backdoor.Lotok 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 Backdoor.Lotok virus can do?

  • Executable code extraction
  • Attempts to connect to a dead IP:Port (1 unique times)
  • 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
  • HTTP traffic contains suspicious features which may be indicative of malware related traffic
  • Performs some HTTP requests
  • Unconventionial binary language: Chinese (Simplified)
  • Unconventionial language used in binary resources: Chinese (Simplified)
  • Deletes its original binary from disk
  • Checks the CPU name from registry, possibly for anti-virtualization
  • Attempts to modify proxy settings
  • Creates a copy of itself

Related domains:

z.whorecord.xyz
a.tomx.xyz

How to determine Backdoor.Lotok?


File Info:

crc32: 850D60A9md5: 0b169071463e81f711c5b780be005e2aname: 0B169071463E81F711C5B780BE005E2A.mlwsha1: 4c913873141c8611b86179d7b18df72e7f07444bsha256: bda9ac7c976d4077921a53b7b178aa402254d9e1e81a3eb7a5cc462982df9f0esha512: 812d1204bee97ac715ed0a0e9b9a66d1895aa4ad2ccfb81eedfb13985f7523b92148927de1b607dd4bc9639ecebf2edfadc1547a9a7a0928150cbb33ce466a04ssdeep: 6144:eNl7XZXUrg3afVDgOojLJODjjA+33livfVG41Td:eNlbZXUUqfVsqAFvfVlldtype: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: x7248x6743x6240x6709 (C) 2006InternalName: GobangGameFileVersion: 1, 0, 0, 1CompanyName: LegalTrademarks: ProductName: GobangGame x5e94x7528x7a0bx5e8fProductVersion: 1, 0, 0, 1FileDescription: GobangGame Microsoft x57fax7840x7c7bx5e94x7528x7a0bx5e8fOriginalFilename: GobangGame.EXETranslation: 0x0804 0x04b0

Backdoor.Lotok also known as:

Bkav W32.AIDetectVM.malware1
Elastic malicious (high confidence)
MicroWorld-eScan Trojan.GenericKD.44578549
FireEye Trojan.GenericKD.44578549
ALYac Trojan.GenericKD.44578549
Cylance Unsafe
VIPRE Trojan.Win32.Generic!BT
AegisLab Trojan.Multi.Generic.4!c
K7AntiVirus Trojan ( 00571cd51 )
BitDefender Trojan.GenericKD.44578549
K7GW Trojan ( 00571cd51 )
Cybereason malicious.3141c8
Cyren W32/Trojan.TDXR-7545
Symantec Trojan.Gen.2
APEX Malicious
Avast Win32:Trojan-gen
ClamAV Win.Malware.Gh0stRAT-7459730-1
Kaspersky HEUR:Backdoor.Win32.Lotok.gen
Alibaba Backdoor:Win32/Zegost.0b488ae7
ViRobot Trojan.Win32.Z.Kryptik.471040.VU
Tencent Win32.Backdoor.Lotok.Eok
Ad-Aware Trojan.GenericKD.44578549
Emsisoft Trojan.GenericKD.44578549 (B)
F-Secure Trojan.TR/Crypt.Agent.nkdmy
DrWeb Trojan.Packed2.42711
TrendMicro Backdoor.Win32.ZEGOST.THKBBBO
McAfee-GW-Edition RDN/YoungLotus
Sophos Mal/Generic-S
Ikarus Trojan.Win32.Farfli
Avira TR/Crypt.Agent.nkdmy
eGambit Unsafe.AI_Score_87%
Antiy-AVL Trojan[Backdoor]/Win32.Lotok
Kingsoft Win32.Troj.Generic_a.a.(kcloud)
Microsoft Backdoor:Win32/Zegost.CQ!bit
Gridinsoft Trojan.Win32.Kryptik.oa
Arcabit Trojan.Generic.D2A836F5
ZoneAlarm HEUR:Backdoor.Win32.Lotok.gen
GData Win32.Trojan.Agent.MHISFC
Cynet Malicious (score: 100)
McAfee Artemis!0B169071463E
MAX malware (ai score=85)
VBA32 BScope.Backdoor.Lotok
Malwarebytes Backdoor.Lotok
Panda Trj/GdSda.A
ESET-NOD32 a variant of Win32/Kryptik.HGZI
TrendMicro-HouseCall Backdoor.Win32.ZEGOST.THKBBBO
Rising Trojan.Kryptik!1.CC61 (CLASSIC)
Fortinet W32/Kryptik.HFPG!tr
AVG Win32:Trojan-gen
Paloalto generic.ml
CrowdStrike win/malicious_confidence_100% (W)
Qihoo-360 Generic/Trojan.2b7

How to remove Backdoor.Lotok?

  • 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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