TrojanDropper:Win32/SmokeLoader.AB!MSR

Written by Robert Bailey
If you spectate the notification of TrojanDropper:Win32/SmokeLoader.AB!MSR detection, it seems that your system has a problem. All viruses are dangerous, with no exceptions. SmokeLoader gives the burglars an easy access to your computer, or even adds it to the botnet.
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Any type of malware exists with the only target – generate profits on you1. And the developers of these things are not thinking of morality – they use all available ways. Grabbing your private data, receiving the payments for the banners you watch for them, utilizing your hardware to mine cryptocurrencies – that is not the complete list of what they do. Do you want to be a riding steed? That is a rhetorical question.

What does the notification with TrojanDropper:Win32/SmokeLoader.AB!MSR detection mean?

The TrojanDropper:Win32/SmokeLoader.AB!MSR detection you can see in the lower right side is shown to you by Microsoft Defender. That anti-malware software is good at scanning, but prone to be generally unreliable. It is vulnerable to malware invasions, it has a glitchy user interface and bugged malware removal capabilities. Thus, the pop-up which says about the SmokeLoader is simply an alert that Defender has actually recognized it. To remove it, you will likely need to use another anti-malware program.

TrojanDropper:Win32/SmokeLoader.AB!MSR found

Microsoft Defender: “TrojanDropper:Win32/SmokeLoader.AB!MSR”

The exact TrojanDropper:Win32/SmokeLoader.AB!MSR malware is a really unpleasant thing. This malware is developed to be a stealthy intruder, which acts as a remote-access tool. When you give somebody remote access willingly, it is okay, but SmokeLoader will not ask you if you would like to provide it. After connecting to your system, criminals are free to do whatever they want – grabbing your files, checking out your messages, collecting personal information, et cetera. Backdoors usually carry an additional stealer – the virus that is made to gather all possible data about you. However, far more common use of the backdoors is forming the botnet. After that, the network of infected computers may be put to use to conduct DDoS attacks or to inflate the poll results on various websites.

Backdoor Summary:

NameSmokeLoader Backdoor
DetectionTrojanDropper:Win32/SmokeLoader.AB!MSR
DamageGain access to the operating system to perform various malicious actions.
SimilarMsil Androme, Lotok, Quasarrat, Asyncrat, Smokeloader, Msil Dcrat, Rewritehttp, Msil Darkcommet
Fix ToolSee If Your System Has Been Affected by SmokeLoader backdoor

SmokeLoader backdoor properties

List of actions done by SmokeLoader.AB!MSR
  • Executable code extraction;
  • Creates RWX memory;
  • Possible date expiration check, exits too soon after checking local time;
  • A process attempted to delay the analysis task.;
  • Attempts to connect to a dead IP:Port (13 unique times);
  • Starts servers listening on 127.0.0.1:0;
  • Reads data out of its own binary image;
  • A process created a hidden window;
  • Drops a binary and executes it;
  • HTTP traffic contains suspicious features which may be indicative of malware related traffic;
  • Performs some HTTP requests;
  • Looks up the external IP address;
  • A scripting utility was executed;
  • Uses Windows utilities for basic functionality;
  • Detects Sandboxie through the presence of a library;
  • Detects Avast Antivirus through the presence of a library;
  • Sniffs keystrokes;
  • Checks for the presence of known windows from debuggers and forensic tools;
  • Steals private information from local Internet browsers;
  • Network activity contains more than one unique useragent.;
  • Exhibits possible ransomware file modification behavior;
  • Writes a potential ransom message to disk;
  • Creates a hidden or system file;
  • Detects VMware through the presence of a registry key;
  • Attempts to modify proxy settings;
  • Attempts to create or modify system certificates;
  • Anomalous binary characteristics;
  • Uses suspicious command line tools or Windows utilities;
Other names for TrojanDropper:Win32/SmokeLoader.AB!MTB
GridinSoftTrojan.Ransom.Gen
BkavW32.AIDetect.malware2
LionicTrojan.Win32.Zenlod.a!c
Elasticmalicious (high confidence)
DrWebTrojan.PWS.Siggen3.2976
ClamAVWin.Packed.Barys-9859531-0
CAT-QuickHealTrojan.SabsikIH.S21959152
ALYacGen:Variant.Jaik.45703
CylanceUnsafe
AlibabaRansom:Win32/Fabookie.f1bf379e
CyrenW32/Kryptik.FFS.gen!Eldorado
SymantecTrojan.Gen.MBT
ESET-NOD32multiple detections
APEXMalicious
AvastWin32:TrojanX-gen [Trj]
CynetMalicious (score: 100)
KasperskyTrojan-Downloader.Win32.Zenlod.lks
BitDefenderGen:Variant.Jaik.45703
NANO-AntivirusTrojan.Win32.Disbuk.jahjfz
MicroWorld-eScanGen:Variant.Jaik.45703
F-SecureHeuristic.HEUR/AGEN.1142105
BitDefenderThetaGen:NN.ZedlaF.34142.n88baOE@FOp
McAfee-GW-EditionBehavesLike.Win32.ICLoader.rc
FireEyeGeneric.mg.6d18c8e8ab9051f7
EmsisoftGen:Variant.Jaik.45703 (B)
SentinelOneStatic AI – Suspicious PE
AviraHEUR/AGEN.1144141
eGambitUnsafe.AI_Score_88%
Antiy-AVLTrojan/Generic.ASMalwS.3454962
KingsoftWin32.PSWTroj.Undef.(kcloud)
MicrosoftTrojanDropper:Win32/SmokeLoader.AB!MSR
GridinsoftTrojan.Win32.Dropper.ko!s5
ArcabitTrojan.Jaik.DB287
ZoneAlarmTrojan-Downloader.Win32.Zenlod.lks
GDataGen:Variant.Jaik.45703
AhnLab-V3Dropper/Win.MulDrop.R439720
McAfeeArtemis!6D18C8E8AB90
MAXmalware (ai score=86)
VBA32BScope.Trojan.Injector
MalwarebytesTrojan.Dropper.SFX.Generic
RisingDropper.Agent/NSIS!1.D805 (CLASSIC)
IkarusTrojan-Downloader.Win32.Agent
FortinetW32/BSE.4Q7Q!tr
AVGWin32:TrojanX-gen [Trj]
Paloaltogeneric.ml
Shortly about backdoors

Backdoors are viruses that may obtain both separated and incorporated shapes. Once you may find that a legitimate program from a reputable developer has a functionality that allows someone to connect to your computer. Will it be someone from the developers or a 3rd party – nobody knows. But the scandal when this aspect is identified in an official program is nearly impossible to miss. There is also gossip that there is a hardware-based backdoor in Intel CPUs2.

Is TrojanDropper:Win32/SmokeLoader.AB!MSR dangerous?

As I have mentioned before, non-harmful malware does not exist. And TrojanDropper:Win32/SmokeLoader.AB!MSR is not an exclusion. This backdoor does not deal a many harm exactly after it releases. Nevertheless, it will likely be a pretty unpleasant surprise when an occasional forum or site in the Web will not let you in, due to the fact that your IP-address is disallowed after the DDoS attack. But even if it is not critical for you – is it positive in any way to understand that someone else can easily access your PC, read your discussions, open your files, as well as spectate what you do?

The spyware that is usually present as a supplement to the TrojanDropper:Win32/SmokeLoader.AB!MSR virus will be just an additional argument to remove it as fast as you can. Nowadays, when users’ data is valued remarkably high, it is too illogical to grant the burglars such a chance. Even worse if the spyware will in some way handle to take your financial info. Seeing 0 on your savings account is the most awful headache, in my judgement.

How did I get this virus?

It is difficult to trace the origins of malware on your computer. Nowadays, things are mixed, and distribution tactics chosen by adware 5 years ago may be utilized by spyware nowadays. However, if we abstract from the exact distribution tactic and will think of why it has success, the explanation will be quite basic – low level of cybersecurity knowledge. People click on ads on strange sites, click the pop-ups they receive in their browsers, call the “Microsoft tech support” assuming that the weird banner that says about malware is true. It is important to understand what is legitimate – to prevent misunderstandings when trying to identify a virus.

Microsoft Tech Support Scam

Microsoft Tech Support Scam

Nowadays, there are two of the most common methods of malware distribution – lure emails and also injection into a hacked program. While the first one is not so easy to evade – you must know a lot to recognize a fake – the second one is simple to handle: just don’t utilize cracked apps. Torrent-trackers and various other sources of “free” applications (which are, actually, paid, but with a disabled license checking) are really a giveaway place of malware. And TrojanDropper:Win32/SmokeLoader.AB!MSR is just amongst them.

How to remove the TrojanDropper:Win32/SmokeLoader.AB!MSR from my PC?

TrojanDropper:Win32/SmokeLoader.AB!MSR malware is very difficult to eliminate manually. It places its data in a variety of locations throughout the disk, and can recover itself from one of the parts. Moreover, a range of modifications in the registry, networking settings and Group Policies are really hard to locate and change to the initial. It is far better to utilize a specific tool – exactly, an anti-malware tool. GridinSoft Anti-Malware will definitely fit the most ideal for malware removal objectives.

Why GridinSoft Anti-Malware? It is very light-weight and has its databases updated almost every hour. Additionally, it does not have such bugs and exploits as Microsoft Defender does. The combination of these facts makes GridinSoft Anti-Malware perfect for taking out malware of any form.

Remove the viruses with GridinSoft Anti-Malware

  • Download and install GridinSoft Anti-Malware. After the installation, you will be offered to perform the Standard Scan. Approve this action.
  • Gridinsoft Anti-Malware during the scan process

  • Standard scan checks the logical disk where the system files are stored, together with the files of programs you have already installed. The scan lasts up to 6 minutes.
  • GridinSoft Anti-Malware scan results

  • When the scan is over, you may choose the action for each detected virus. For all files of SmokeLoader the default option is “Delete”. Press “Apply” to finish the malware removal.
  • GridinSoft Anti-Malware - After Cleaning
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References

  1. Read about malware types on GridinSoft Threat encyclopedia.
  2. Gossip about the backdoor in Intel processors on Reddit.

About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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