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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 28 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:
1d50b6e30bf17784c3d32027eb604473

SHA-1:
a8741c5a3ab3814393df58164e3839710743c46b

SHA-256:
6d962a600f090b4f0348f4e598d0586a6839e65a08f8090384e398df722828cb

Scanner detections:
28 / 68

Status:
Adware

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

Analysis date:
4/29/2024 7:25:32 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.Agent.NYU
979

Agnitum Outpost
PUA.Agent
7.1.1

avast!
Win32:Malware-gen
2014.9-140601

AVG
MalSign.Pafun
2015.0.3457

Bitdefender
Adware.Agent.NYU
1.0.20.760

Comodo Security
Application.Win32.Altbrowse.AK
18076

Dr.Web
Trojan.BPlug.37
9.0.1.0152

Emsisoft Anti-Malware
Adware.Agent.NYU
8.14.06.01.07

ESET NOD32
Win32/BrowseFox (variant)
8.9656

Fortinet FortiGate
Adware/Agent
6/1/2014

F-Secure
Adware.Agent.NYU
11.2014-01-06_1

G Data
Adware.Agent.NYU
14.6.24

IKARUS anti.virus
AdWare.Agent
t3scan.1.6.1.0

K7 AntiVirus
Unwanted-Program
13.176.11711

Kaspersky
not-a-virus:AdWare.Win32.Agent
14.0.0.3778

Malwarebytes
PUP.Optional.PacFunction.A
v2014.06.01.07

McAfee
Artemis!1D50B6E30BF1
5600.7113

MicroWorld eScan
Adware.Agent.NYU
15.0.0.456

NANO AntiVirus
Riskware.Win32.Agent.cqvnby
0.28.0.59048

nProtect
Adware.Agent.NYU
14.04.09.01

Quick Heal
AdWare.Agent.ahbx (Not a Virus)
6.14.12.00

Reason Heuristics
PUP.Installer.PacFunction.F
14.6.1.7

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.14530

Sophos
Generic PUA IN
4.98

SUPERAntiSpyware
Adware.BrowseFox/Variant
10570

Trend Micro House Call
TROJ_GEN.F47V0325
7.2.152

Vba32 AntiVirus
AdWare.Agent
3.12.26.0

VIPRE Antivirus
Yontoo
28164

File size:
2.8 MB (2,920,440 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 1:00:00 AM

Valid to:
1/10/2015 12:59:59 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:
12/5/2009 11:52:01 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
49152:MWF88FAdRiOwnfz0g5Zd2Ogok5OrAFAQrfcabOjDUbEeS73w9s/Wl8U:MWuGWR/wfz0sZdnArc1vheS7g9sWOU

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:
7.9986

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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