home

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 26 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:
cd907d967aeddf51457cd2f1a533ea97

SHA-1:
d0970ae030b271c149e7f92ff013157df27b79d9

SHA-256:
9d82d1578ee5686cf4887548c1aa78d833577a1915ac78bd1c16b0c02cd39eeb

Scanner detections:
26 / 68

Status:
Adware

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

Analysis date:
4/29/2024 5:49:40 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.Agent.NYU
1036

Agnitum Outpost
PUA.Agent
7.1.1

Avira AntiVirus
Adware/Agent.nyu.4
7.11.141.58

Bitdefender
Adware.Agent.NYU
1.0.20.475

Comodo Security
Application.Win32.Altbrowse.AK
18047

Dr.Web
Trojan.BPlug.37
9.0.1.095

Emsisoft Anti-Malware
Adware.Agent.NYU
8.14.04.05.10

ESET NOD32
Win32/BrowseFox (variant)
8.9637

Fortinet FortiGate
Adware/Agent
4/5/2014

F-Secure
Adware.Agent.NYU
11.2014-05-04_7

G Data
Adware.Agent.NYU
14.4.24

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

K7 AntiVirus
Unwanted-Program
13.176.11663

Kaspersky
not-a-virus:AdWare.Win32.Agent
14.0.0.4063

Malwarebytes
PUP.Optional.PacFunction.A
v2014.04.05.10

McAfee
Artemis!CD907D967AED
5600.7170

MicroWorld eScan
Adware.Agent.NYU
15.0.0.285

NANO AntiVirus
Riskware.Win32.Agent.cqvnby
0.28.0.58873

nProtect
Adware.Agent.NYU
14.04.04.01

Reason Heuristics
PUP.Installer.PacFunction.F
14.4.5.10

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.14403

Sophos
Generic PUA KE
4.98

SUPERAntiSpyware
Adware.BrowseFox/Variant
10684

Trend Micro House Call
TROJ_GEN.F47V0329
7.2.95

Vba32 AntiVirus
AdWare.Agent
3.12.26.0

VIPRE Antivirus
Yontoo
28020

File size:
964.8 KB (987,928 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 8:00:00 AM

Valid to:
1/10/2015 7:59:59 AM

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:
12/6/2009 6:52:01 AM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
24576:/3Ynb6F8IRAhDRiYwR+Q++6S1qVnb6l8j:gWF8MAdRiOO6JVWl8j

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...
 
[+]

Entropy:
7.9907

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://install-cdn.pacfunction.info/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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