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ext_setup.exe

Sergei Ivanovich Drozdov

The is the installer for the WebPick InstalleRex download manager which bundles applications with offers for additional 3rd party software, mostly unwanted adware, and may be installed without consent. The application ext_setup.exe by Sergei Ivanovich Drozdov has been detected as adware by 24 anti-malware scanners. The program is a setup application that uses the WebPick InstalleRex installer. It is built using the Crossrider cross-browser extension toolkit. While the file utilizes the Crossrider framework and delivery services, it is not owned by Crossrider.
Publisher:
Sergei Ivanovich Drozdov  (signed and verified)

MD5:
3b9a34bd741461a32ea6dd4e4c66df6f

SHA-1:
3baa77c376b66ecb666ba5658b86b286041c546c

SHA-256:
f2e4b9a728e6ce633138abc102ee3831dcab4a25406e71b4723be9cf69068191

Scanner detections:
24 / 68

Status:
Adware

Explanation:
JustPlugIt cross-browser extension/BHO delivered via adware installer (WebPick InstalleRex) and includes background service (AssistantSvc). Randomizes files names.

Description:
This is an installer which may bundle legitimate applications with offers for additional 3rd-party applications that may be unwanted by the user. While the installer contains an 'opt-out' feature this is not set be defult and is usually overlooked.

Analysis date:
4/23/2024 10:01:06 AM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Gen:Variant.Adware.Dropper.101
1016

Agnitum Outpost
PUA.Agent
7.1.1

Avira AntiVirus
ADWARE/Adware.Gen7
7.11.145.40

avast!
Win32:MultiPlug-AN [PUP]
2014.9-140424

AVG
Generic_r
2015.0.3494

Bitdefender
Gen:Variant.Adware.Dropper.101
1.0.20.570

Comodo Security
Application.Win32.Multiplug.R
18160

Dr.Web
Trojan.Crossrider.12895
9.0.1.0114

Emsisoft Anti-Malware
Gen:Variant.Adware.Dropper.101
8.14.04.24.12

ESET NOD32
Win32/AdWare.MultiPlug
8.9718

F-Secure
Gen:Variant.Adware.Dropper.101
11.2014-24-04_5

G Data
Gen:Variant.Adware.Dropper.101
14.4.24

K7 AntiVirus
Unwanted-Program
13.176.11873

Kaspersky
not-a-virus:AdWare.Win32.MultiPlug
14.0.0.3967

McAfee
PUP-FID!3B9A34BD7414
5600.7150

MicroWorld eScan
Gen:Variant.Adware.Dropper.101
15.0.0.342

NANO AntiVirus
Trojan.Win32.Crossrider.cwpxlg
0.28.0.59492

Panda Antivirus
Trj/Genetic.gen
14.04.24.12

Qihoo 360 Security
Malware.QVM10.Gen
1.0.0.1015

Reason Heuristics
PUP.Installer.SergeiIvanovichDrozdov.J
14.4.24.11

Rising Antivirus
PE:Malware.MultiPlug!6.13CF
23.00.65.14422

Sophos
MultiPlug
4.98

Vba32 AntiVirus
AdWare.Win64.MultiPlag
3.12.26.0

VIPRE Antivirus
JustPlugIt
28570

File size:
1.5 MB (1,617,800 bytes)

File type:
Executable application (Win32 EXE)

Bundler/Installer:
WebPick InstalleRex

Common path:
C:\users\{user}\appdata\local\temp\{random}.tmp\addons\ext_setup.exe

Digital Signature
Signed by:
Sergei Ivanovich Drozdov

Authority:
Unizeto Technologies S.A.

Valid from:
1/8/2014 1:24:34 PM

Valid to:
1/8/2015 1:24:34 PM

Subject:
E=drozdov54@hotmail.com, CN="Open Source Developer, Sergei Ivanovich Drozdov", OU=Sedro Soft, O=Sergei Ivanovich Drozdov, C=RU

Issuer:
CN=Certum Level III CA, OU=Certum Certification Authority, O=Unizeto Technologies S.A., C=PL

Serial number:
4E05AFB21C1318DB8A2C0669760C9050

File PE Metadata
Compilation timestamp:
4/10/2014 11:39:17 AM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
11.0

CTPH (ssdeep):
24576:zcTRZsbgPu0wxf6ptY/fOxT0PX3AgndvfbYzA9AJ3NEgysb+ZhMQAfBBI:QZ1xwxyptY3ORCazA9qEgysSZn

Entry address:
0x1085B

Entry point:
E8, CE, 49, 00, 00, E9, 00, 00, 00, 00, 6A, 14, 68, 00, 21, 42, 00, E8, AF, 20, 00, 00, E8, E0, 07, 00, 00, 0F, B7, F0, 6A, 02, E8, 61, 49, 00, 00, 59, B8, 4D, 5A, 00, 00, 66, 39, 05, 00, 00, 40, 00, 74, 04, 33, DB, EB, 33, A1, 3C, 00, 40, 00, 81, B8, 00, 00, 40, 00, 50, 45, 00, 00, 75, EB, B9, 0B, 01, 00, 00, 66, 39, 88, 18, 00, 40, 00, 75, DD, 33, DB, 83, B8, 74, 00, 40, 00, 0E, 76, 09, 39, 98, E8, 00, 40, 00, 0F, 95, C3, 89, 5D, E4, E8, 20, 37, 00, 00, 85, C0, 75, 08, 6A, 1C, E8, DC, 00, 00, 00, 59, E8...
 
[+]

Entropy:
7.9048  (probably packed)

Code size:
102.5 KB (104,960 bytes)

The executing file has been seen to make the following network communication in live environments.

TCP (HTTP):
Connects to r1.stylezip.info  (54.186.255.26:80)

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