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constasurfsetup.exe

ConstaSurf

This is the installer and setup program from the ConstaSurf branded Yontoo adware web browser extension. This adware injects various forms of advertisements in the user's web browser based on the HTML content and URLs viewed. Ad include banners, in-line context text links, coupons, and search. The program will install an auto-updating Windows service that will update the software with additional features. The application constasurfsetup.exe by ConstaSurf has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. The program is a setup application that uses the NSIS (Nullsoft Scriptable Install System) installer.
Publisher:
ConstaSurf  (signed and verified)

MD5:
99fca9d4ecd431484dabb93702d708b4

SHA-1:
d4de718b8fb76dce751de835bdcb39236c1e53e0

SHA-256:
74f1a5c610487d1add89927d1c4d017064bfdb1adcec2633dd5d2cb0c62750d1

Scanner detections:
1 / 68

Status:
Adware

Explanation:
Belongs to the Sambreel/Yontoo progam that inserts various forms of advertising in the user's web browser, installed with minimal or no user consent.

Analysis date:
11/27/2024 1:11:39 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Installer.ConstaSurf.P
14.5.17.19

File size:
462.6 KB (473,704 bytes)

File type:
Executable application (Win64 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\users\{user}\appdata\local\microsoft\windows\temporary internet files\content.ie5\{random}\constasurfsetup.exe

Digital Signature
Signed by:
ConstaSurf

Subject:
CN=ConstaSurf, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=ConstaSurf, L=Santa Monica, S=California, C=US

Serial number:
46A82C62F93896A2C29C94EC6C4D8A3D

File PE Metadata
OS bitness:
Win64

CTPH (ssdeep):
12288:Zyi32nb1s15AB/G/8/3D0Fw/tN8dkmLtpHHHrh7r:ZyLnb6F8/z0FmcLbH1r

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, 60, 91, 40, 00, 33, F6, C6, 44, 24, 14, 20, FF, 15, 30, 70, 40, 00, 68, 01, 80, 00, 00, FF, 15, B0, 70, 40, 00, 53, FF, 15, 7C, 72, 40, 00, 6A, 08, A3, 38, 6F, 44, 00, E8, F1, 2B, 00, 00, A3, 84, 6E, 44, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 30, 9C, 42, 00, FF, 15, 58, 71, 40, 00, 68, 54, 91, 40, 00, 68, 80, 2E, 44, 00, E8, A4, 28, 00, 00, FF, 15, AC, 70, 40, 00, BF, 00, F0, 46, 00, 50, 57, E8, 92, 28, 00, 00...
 
[+]

Entropy:
7.9737

Packer / compiler:
Nullsoft install system v2.x

The file constasurfsetup.exe has been seen being distributed by the following 2 URLs.

http://dl10.downserver1.com/o43/.../ConstaSurfSetup.exe

http://cdn.download4desktop.com/Installer/.../ConstaSurfSetup.exe

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

TCP (HTTP):
Connects to wac.edgecastcdn.net  (72.21.81.13:80)

TCP (HTTP):
Connects to service.yontoo.com  (8.25.35.148:80)

TCP (HTTP):
Connects to api.yontoo.com  (8.25.35.15:80)

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