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setup.exe

Irrational Number Applications

This is the installer and setup program from the Irrational Number Applications 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 background service that will update the software with additional features. The application setup.exe by Irrational Number Applications 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:
Irrational Number Applications  (signed and verified)

MD5:
e7510ab29f2bb046a0fb773171f5e175

SHA-1:
b567e58a16e3b01516ff0b91f1e0841daa57c5e6

SHA-256:
bdd692a67505cd7bb75d38b334c336eb8e78e2798615ff5f80fba2ebbf338019

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:
12/27/2024 2:02:05 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo.IrrationalNumberApplications.Installer (M)
15.8.6.6

File size:
4.3 MB (4,475,120 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Language:
Language Neutral

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

Digital Signature
Signed by:
Irrational Number Applications

Authority:
Symantec Corporation

Valid from:
1/20/2015 11:00:00 AM

Valid to:
3/21/2016 10:59:59 AM

Subject:
CN=Irrational Number Applications, O=Irrational Number Applications, L=St. James, S=St. James, C=BB

Issuer:
CN=Symantec Class 3 SHA256 Code Signing CA, OU=Symantec Trust Network, O=Symantec Corporation, C=US

Serial number:
637F0A74512CF65B05B3A5A0241D6624

File PE Metadata
Compilation timestamp:
6/7/2009 7:41:48 AM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
98304:b9WtB+RjDIBzwBsJVGecIc3A1o/gqU4QWhPjzz6515X+VRFFtyTWtBL:bNDO55/5YUR5rXcFse

Entry address:
0x30CB

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, 3F, 42, 00, E8, F1, 2B, 00, 00, A3, 84, 3E, 42, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 30, F4, 41, 00, FF, 15, 58, 71, 40, 00, 68, 54, 91, 40, 00, 68, 80, 36, 42, 00, E8, A4, 28, 00, 00, FF, 15, AC, 70, 40, 00, BF, 00, 90, 42, 00, 50, 57, E8, 92, 28, 00, 00...
 
[+]

Entropy:
7.9773

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

The file setup.exe has been seen being distributed by the following URL.

http://gp387a.sazzip.com/ws/.../Setup.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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