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setup.exe

PacFunction

This is the installer and setup program from the PacFunction 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 PacFunction has been detected as adware by 16 anti-malware scanners. The program is a setup application that uses the NSIS (Nullsoft Scriptable Install System) installer. It will plug into the web browser and display context-based advertisements by overwriting existing ads or by inserting new ones on various web pages.
Publisher:
PacFunction  (signed and verified)

MD5:
5c7942ea61f2c43c548c5f70af03d000

SHA-1:
39ad991a14dfcda4779e3ef5130b2150d4346958

SHA-256:
0eac1cc1e173e4c6cb0ce64c84175af2f0cf1011e1057a2bebb80d83dc07782d

Scanner detections:
16 / 68

Status:
Adware

Explanation:
Injects advertising in the web browser in various formats.

Analysis date:
4/24/2024 1:00:51 PM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
PUA.Agent
7.1.1

Comodo Security
Application.Win32.Altbrowse.AK
17912

Dr.Web
Trojan.BPlug.28
9.0.1.071

ESET NOD32
Win32/BrowseFox (variant)
8.9525

Fortinet FortiGate
Adware/Agent
3/12/2014

IKARUS anti.virus
not-a-virus:AdWare.Win32.Agent
t3scan.2.2.29

K7 AntiVirus
Unwanted-Program
13.176.11422

Kaspersky
not-a-virus:AdWare.Win32.Agent
14.0.0.4183

Malwarebytes
PUP.Optional.PacFunction.A
v2014.03.13.04

McAfee
Artemis!5C7942EA61F2
5600.7194

NANO AntiVirus
Riskware.Win32.Agent.cqvnby
0.28.0.58101

Reason Heuristics
PUP.Installer.PacFunction.F
14.3.13.16

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.14310

Sophos
Generic PUA LJ
4.98

Trend Micro House Call
TROJ_GE.37F29EB9
7.2.71

VIPRE Antivirus
Yontoo
27278

File size:
2.7 MB (2,834,096 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

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

Digital Signature
Signed by:
PacFunction

Authority:
VeriSign, Inc.

Valid from:
1/9/2014 12:00:00 AM

Valid to:
1/9/2015 11:59:59 PM

Subject:
CN=PacFunction, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=PacFunction, L=San Diego, S=California, C=US

Issuer:
CN=VeriSign Class 3 Code Signing 2010 CA, OU=Terms of use at https://www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US

Serial number:
4DF47FADF68D2EB9B8A7923DCCC176FF

File PE Metadata
Compilation timestamp:
12/5/2009 10:52:01 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
49152:gYWF88FAdRiOQhz0gh89RpjbhAMhH6OwDqnuAY5baYfVEqmhNAWl8z:gYWuGWR/Oz0xfhrgOwXolhuWOz

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, 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...
 
[+]

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

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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