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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 27 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:
68de90679e70bc55b371cfb658a7260f

SHA-1:
5f7a61040a716873a87bd44614a2cf71c1342911

SHA-256:
098f1f726cdc3aa1808bbdde3c82d264bf0ee35696955e05c1d3d6f7fbde6eaf

Scanner detections:
27 / 68

Status:
Adware

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

Analysis date:
4/29/2024 5:21:26 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.Agent.NYU
945

Agnitum Outpost
Riskware.Agent
7.1.1

AVG
MalSign.Pafun
2015.0.3423

Bitdefender
Adware.Agent.NYU
1.0.20.925

Comodo Security
Application.Win32.Altbrowse.AK
18076

Dr.Web
Trojan.BPlug.37
9.0.1.0185

Emsisoft Anti-Malware
Adware.Agent.NYU
8.14.07.04.06

ESET NOD32
Win32/BrowseFox (variant)
8.9656

Fortinet FortiGate
Adware/Agent
7/4/2014

F-Secure
Adware.Agent.NYU
11.2014-04-07_6

G Data
Adware.Agent.NYU
14.7.24

IKARUS anti.virus
not-a-virus:AdWare.Win32.Agent
t3scan.1.6.1.0

K7 AntiVirus
Unwanted-Program
13.176.11711

Kaspersky
not-a-virus:AdWare.Win32.Agent
14.0.0.3611

Malwarebytes
PUP.Optional.PacFunction.A
v2014.07.04.06

McAfee
Artemis!68DE90679E70
5600.7079

MicroWorld eScan
Adware.Agent.NYU
15.0.0.555

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)
7.14.12.00

Reason Heuristics
PUP.Installer.PacFunction.F
14.7.4.17

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.14702

Sophos
Generic PUA EB
4.98

SUPERAntiSpyware
Adware.BrowseFox/Variant
10503

Trend Micro House Call
TROJ_GEN.F47V0316
7.2.185

Vba32 AntiVirus
AdWare.Agent
3.12.26.0

VIPRE Antivirus
Yontoo
28164

File size:
2.7 MB (2,830,968 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:sJWF88FAdRiOxzEz0gcw+m8WIXROylMNQnIjdGu+DLu909kkVICGWl8W:sJWuGWR/REz0LwsWIXPMNQ21yukbGWOW

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 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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